JP4318253B2 - Transmitter - Google Patents

Description

  The present invention relates to a multi-carrier signal transmitter, and more particularly, for a plurality of carriers, can suppress an average variation in the input level of a multi-carrier signal to an amplifier in response to a variation in the input level of each carrier. It relates to a transmitter that can.

Generally, a base station apparatus (CDMA base station apparatus) provided in a mobile communication system that employs a W-CDMA (Wideband Code Division Multiple Access) system as a mobile communication system is physically far away. Since it is necessary to make a radio signal reach a distant mobile station apparatus (CDMA mobile station apparatus), it is necessary to amplify a signal to be transmitted by an amplifier (amplifier) and transmit it.
However, since the amplifier is an analog device, its input / output characteristics are nonlinear functions. In particular, after the amplification limit called the saturation point, even if the power input to the amplifier is increased, the output power is almost constant and becomes saturated. This nonlinear output causes nonlinear distortion in the output signal.

Normally, the signal component outside the desired signal band is suppressed to a low level by the band limiting filter in the transmission signal before amplification, but nonlinear distortion occurs in the signal after passing through the amplifier and the signal goes out of the desired signal band (adjacent channel). Ingredients leak.
For example, since the base station apparatus has a high transmission power as described above, the magnitude of the leakage power to the adjacent channel is strictly defined, and a technique for reducing the adjacent channel leakage power (ACP). Is used.
As one of the above techniques, a technique is known in which a peak limiter for limiting and outputting the maximum power (peak) of a signal to be transmitted is provided at the front stage of the amplifier, and the signal whose peak is limited is used as the input signal of the amplifier. .

As a CDMA base station transmitter using a peak limiter, Japanese Patent Laid-Open No. 2002-44054 “Carrier Synthesis Transmitter with Limiter Circuit” published on February 8, 2002 (Applicant: Hitachi Kokusai Electric Inc., Inventor: Sasaki) Kohei) has been proposed.
In the above invention, during multicarrier transmission from the base station, the limiter circuit (peak limiter) instantaneously calculates the ratio between the instantaneous power and the average power as a peak factor based on the signal obtained by multiplexing all the carriers, and the instantaneous By comparing the peak factor with the peak factor threshold value, which is the reference value, and outputting a limit coefficient that matches the required level of clipping based on the result, and multiplying the limit coefficient for each carrier to limit the peak. The dynamic range of the amplifier that amplifies the multicarrier can be effectively used, and the bit error rate in the mobile station can be reduced without performing unnecessary peak restriction.

JP 2002-44054 A (pages 5-7, FIG. 1)

The conventional peak limiter detects the average power of the input signal and the instantaneous power of the input signal with respect to the input signal in order to suppress the maximum power of the signal input to the amplifier, and from the average power information and the instantaneous power information. Detects the presence or absence of a peak to be limited and outputs peak detection information. When a peak to be limited is detected according to the peak detection information, the power of the input signal to be input is set in advance. It is conceivable that an output signal is output while being limited to power, and as a result, a signal limited to the limit power is input to the amplifier.
In a transmitter that handles a plurality of carriers, since a multicarrier signal in which a plurality of carriers are multiplexed (combined) is input to an amplifier, the peak limiter calculates instantaneous power and average power after carrier multiplexing, The presence or absence of a peak is detected based on the value of.

  Here, as a method for detecting the presence or absence of a peak, the ratio of the instantaneous power and the average power of the input signal is obtained, and if it is large compared with a preset peak factor threshold, it is determined that the peak is to be subjected to a limit. A way to do this is considered. Here, the peak factor is the ratio of the maximum power and the average power in the amplifier input signal as shown in FIG. 8, that is, the smaller the difference between the maximum power and the average power, the smaller the peak factor. FIG. 8 is an explanatory diagram of the peak factor of a general amplifier.

Usually, the input signal input to the peak limiter is a baseband signal before band limitation, and after the limiter processing is performed by the peak limiter, the band limitation is performed by the filter, so that distortion does not occur in the amplifier, and Since the peak value of the input signal is limited by the peak limiter, the peak factor of the input signal is reduced, and the operating point of the amplifier that performs amplification after band limitation can be raised, so that power efficiency can be improved. is there.
Here, since the band limitation is performed after the limiter by the peak limiter, the peak factor after the band limitation is usually larger than the peak factor before the band limitation. This is because a point where the peak becomes high appears when the rectangular wave before the band limitation is dull after the band limitation. Therefore, it is necessary to set the peak factor threshold set in advance in the peak limiter to be low in consideration of the increase in the peak factor after band limitation.

  Next, a general CDMA base station transmitter and transmission amplifier using a peak limiter will be described with reference to FIGS. FIG. 6 is a configuration block diagram of a transmission amplifier used in a general CDMA base station, and FIG. 7 is a configuration block diagram of a general CDMA base station transmitter.

The CDMA base station transmission amplifier of FIG. 6 modulates and combines n (n> 2) carriers and outputs them as a multicarrier signal, a D / A converter 2 that performs digital / analog conversion, and a radio A frequency conversion unit 3 that performs conversion processing to a frequency and a power amplification unit 4 that amplifies a radio frequency signal are configured.
The transmitter of FIG. 7 corresponds to the transmitter 1 of FIG. 6, and includes carrier code multiplexed signal generation units 50-1 to 50-n for spreading and modulating transmission data for each carrier, A peak power suppression unit (peak limiter) 51 that limits signal peaks as an independent sequence every time, waveform shaping filters 52-1 to 52-n that limit the band of each carrier, and digital orthogonal modulation for each carrier Digital quadrature modulation sections 53-1 to 53-n that perform the above and an adder 54 that synthesizes the digital quadrature modulated carrier.

  The operation of the transmitter of the CDMA base station in FIG. 7 is that the transmission data of each carrier, which is digital data, is input to the corresponding carrier code multiplex signal generators 50-1 to 50-n and spread-modulated by a unique spreading code. Each carrier is output as an in-phase component (I component) and a quadrature component (Q component), and the peak power limiter 51 limits the peak value based on a preset peak factor threshold for each carrier. Is done. Each carrier whose peak value is limited is subjected to band limitation in the corresponding waveform shaping filters 52-1 to 52-n, and further, orthogonal modulation is performed in the corresponding digital orthogonal modulation units 53-1 to 53-n. Then, the carriers orthogonally modulated by the adder 54 are combined and output as a multicarrier signal.

  The multicarrier signal output from the transmitter of FIG. 7 is further converted into an analog signal by the D / A converter 2 in FIG. 6, converted to a radio frequency by the frequency converter 3, and then converted by the power amplifier 4. Amplified. The amplified multicarrier signal is wirelessly transmitted via an antenna (not shown).

  That is, in the transmission amplifier of FIG. 6, the peak value of each carrier is limited by the peak power suppression unit 51 of the transmitter 1, performs band limitation and up-conversion, and then combines and combines the combined multicarrier signal into a power amplification unit 4, and the peak factor of the carrier before combining is reduced, so that the peak factor of the multicarrier signal after combining is also reduced. As a result, the peak factor of the input signal to the power amplifier 4 is suppressed. Thus, the operating point of the power amplifier 4 can be raised.

However, the above-described CDMA base station transmitter has a problem that, when peak restriction (suppression) is performed on a plurality of carriers, if the input level of the carrier fluctuates, the level after the peak restriction fluctuates.
As described above, when peak limiting of a plurality of carriers is performed, the peak limiter calculates the instantaneous power and the average power based on the input level after carrier multiplexing, that is, the total power of the carriers, and the ratio and peak are calculated. The presence or absence of a peak is detected by comparing with a factor threshold, and peak control is performed for each carrier.

  In the peak limiter, the peak factor threshold is optimized when each carrier has the maximum output and the same level, but the peak suppression is performed even when all the carriers are not the maximum output and the same level. Further, the peak factor threshold is generally determined depending on the number of carriers.

That is, the peak limitation in the peak power suppression unit 51 (peak limiter) of the transmitter 1 having the above-described configuration is that there are carrier signals in all of the plurality of carriers (n in the figure) input in the apparatus configuration, and each carrier signal. When the peak is detected based on the total power of the carrier under the assumption that the power is at the same level, the peak power is equally suppressed at a uniform suppression rate for each carrier, and the total of all carriers is thereby calculated. Thus, the desired peak suppression is achieved, and as a result, the peak factor of the multicarrier is reduced.
When such a peak power suppression unit 51 is used in a transmitter, if the input level of a specific carrier suddenly fluctuates temporarily, peak restriction (suppression) is applied to all of the plurality of carriers, and the level after peak restriction is reduced. As a result, there is a problem that the level of the combined multi-carrier signal varies.

  Here, if the input level of a carrier fluctuates while the peak factor threshold is fixed, the total power of the carrier fluctuates, so the peak limit by the peak limiter is not optimal, and the level of the multicarrier signal is A power deviation that varies within a range of ± 0.3 dB occurs.

  Also, when the input level of a specific carrier is constant and the input level of all other carriers fluctuates, the total power of the carrier fluctuates, so the peak limit by the peak limiter is not optimal and the input A power deviation in which the level after the restriction of a carrier with a constant level fluctuates occurs. This power deviation depends on the number of carriers, and fluctuates within a range of ± 0.3 dB when the total number of carriers is two carriers and within a range of ± 1.2 dB when the number of carriers is four.

  That is, in the case of the conventional transmitter shown in FIG. 7, when the input level of a specific carrier changes rapidly, the total power of the carrier also changes rapidly, so even if the average power does not change much, the instantaneous power Increases rapidly, the peak factor increases, and a peak is detected. As a result, uniform peak suppression works for all carriers, greatly affects carriers whose input level does not fluctuate, reduces overall power, and reduces the level of multicarrier signals. One problem occurs.

In addition, for example, when some of the plurality of carriers are stopped, the input level of a specific carrier in the operating carrier suddenly fluctuates, and the peak factor increases in the peak limiter. If detected, since all the carriers including the stopped carrier are uniformly suppressed at the same rate, the peak limiter is used when several carriers are stopped. A second problem is that the suppression rate is not sufficient and the level of the multicarrier signal cannot be sufficiently reduced.
In addition, as described above, the peak power suppression unit 51 sets the peak factor threshold lower in consideration of the peak generated by the subsequent band limitation (waveform shaping filter 52), so that the peak suppression is more than necessary in the current circuit. There is a third problem that sometimes operates.

  On the other hand, in the W-CDMA communication system, power control corresponding to an output difference of 0.1 dB or 0.5 dB is about to be realized in the transmitter of the base station. Because of the above-mentioned problems, such as when peak limiting is not sufficiently performed due to increase / decrease in input / output and increase / decrease in input level of each carrier, or excessive peak suppression causes excessive level suppression, There was a problem that it was difficult to achieve.

  The present invention has been made in view of the above circumstances, and it is possible to suppress fluctuation of the input level of the multicarrier signal to the amplifier on average in response to increase / decrease of the number of transmission carriers and fluctuation of the input level of each carrier. The purpose is to provide a transmitter.

The present invention is a transmitter that suppresses fluctuations in the input level of a multicarrier signal obtained by combining a plurality of carriers, and calculates the ratio between the instantaneous power and the average power of the sum of the power levels of each input carrier. The presence or absence of a peak is detected by comparing with a preset peak factor threshold, and when a peak is detected , each carrier is combined by multiplying uniformly by a multiplication coefficient corresponding to the sum of power levels. A peak suppressor that outputs a carrier in which the power level of each carrier is suppressed so that the subsequent power becomes a specified power, and an input power calculation that calculates an average input power level for each carrier before input to the peak suppressor. a Department, the output power calculating unit for each calculating a mean output power level for each carrier after being output from the peak suppression unit, calculated by the input power calculating section Determines a gain value based on the average output power level calculated average input power level and the output power calculating unit that, a monitoring unit for outputting a gain value as a level control information for controlling the signal level of the multicarrier signal, A level adjustment unit that adjusts the level of the multicarrier signal based on level control information output from the monitoring unit is provided.

The present invention also provides a transmitter that suppresses fluctuations in the input level of the multicarrier signal so that the signal level of the multicarrier signal obtained by combining a plurality of carriers is adjusted, and the power of each input carrier The presence / absence of a peak is detected by comparing the ratio between the instantaneous power and the average power of the level sum with a preset peak factor threshold value, and when the peak is detected , the sum of the power levels corresponding to each carrier is detected . A peak suppressor that outputs a carrier in which the power level of each carrier is suppressed so that the combined power of each carrier becomes a specified power by uniformly multiplying the multiplication coefficient, and each before input to the peak suppressor average output power level and input power calculating unit for each calculating a mean input power level with respect to the carrier, for each carrier after being output from the peak suppression unit An output power calculating unit, each for calculating, for each carrier, and determines a gain value based on the average output power level calculated by the average input power level and the output power calculating unit calculated by the input power calculating unit, each carrier to a monitoring unit for outputting a gain value as a level control information for controlling the signal level of, for each carrier, and further comprising a level adjusting section based on the corresponding level control information adjusting the level of each carrier .

The present invention also relates to a transmitter that suppresses fluctuations in the input level of a multicarrier signal obtained by combining a plurality of carriers, and is a ratio between the instantaneous power and the average power of the sum of the power levels of the inputted carriers. Is compared with a preset peak factor threshold to detect the presence or absence of a peak, and when a peak is detected, each carrier is multiplied by a multiplication coefficient corresponding to the sum of power levels uniformly. A peak suppressor that outputs a carrier in which the power level of each carrier is suppressed so that the combined power becomes a specified power, and an input that calculates the total average input power level for each carrier before input to the peak suppressor a power calculating section, and the output power calculating unit for calculating the average output power level of the sum for each carrier outputted from the peak suppression unit, an input power calculation unit Based on the average output power level of the sum which is calculated average input power level calculated by the total sum as the output power calculating unit determines a gain value, it outputs a gain value as a level control information for controlling the signal level of the multicarrier signal And a level adjusting unit for adjusting the level of the multicarrier signal based on the level control information output from the monitoring unit.

The present invention also relates to a transmitter that suppresses fluctuations in the input level of a multicarrier signal obtained by combining a plurality of carriers, and the ratio between the instantaneous power and the average power of the power level of the input multicarrier signal. The presence or absence of a peak is detected by comparing it with a preset peak factor threshold, and when a peak is detected, the multicarrier power is multiplied by a multiplication coefficient corresponding to the power level to thereby adjust the power of the multicarrier to a specified power. and a peak suppression section for outputting a multi-carrier signal suppressed power level so that the input power calculating section for calculating an average input power level to the input before the multicarrier signal to the peak suppression unit, output from the peak suppression unit an output power calculating unit for calculating the average output power level for a multi-carrier signal, computed by the input power calculating section It determines a gain value based on the average output power level calculated average input power level and the output power calculating unit, a monitoring unit for outputting a level control information for controlling the signal level of the multicarrier signal, and outputs the monitoring unit A level adjustment unit that adjusts the level of the multicarrier signal based on the level control information is provided.

According to the present invention, there is provided a transmitter that suppresses fluctuations in the input level of a multicarrier signal obtained by combining a plurality of carriers, and a peak suppressor and an instantaneous power that is the sum of the power levels of each carrier input The presence or absence of a peak is detected by comparing the ratio with the average power with a preset peak factor threshold, and when a peak is detected, a multiplication coefficient corresponding to the sum of the power levels is uniformly multiplied for each carrier. Output the carrier with the power level of each carrier suppressed so that the combined power of each carrier becomes the prescribed power, and the input power calculation unit average input power level for each carrier before input to the peak suppression unit each calculated, the average output power level of each calculated for each carrier after the output power calculating unit is output from the peak suppression unit, monitoring unit input power calculating In determining a gain value based on the average output power level computed computed average input power level and the output power calculating unit, and outputs a gain value as a level control information for controlling the signal level of the multicarrier signal, the level Since the adjustment unit is a transmitter that adjusts the level of the multicarrier signal based on the level control information output from the monitoring unit, the fluctuation in the level of the multicarrier signal can be suppressed in response to the fluctuation in the input level of the carrier. There is an effect that can be done.

According to the present invention, a transmitter that suppresses fluctuations in the input level of a multicarrier signal so that the signal level of a multicarrier signal obtained by combining a plurality of carriers is adjusted, and a peak suppression unit is input. The presence or absence of a peak is detected by comparing the ratio between the instantaneous power and the average power of the total power level of each carrier with a preset peak factor threshold, and when a peak is detected , the power level for each carrier is detected. The carrier that suppresses the power level of each carrier is output so that the combined power of each carrier becomes the specified power by uniformly multiplying the multiplication coefficient corresponding to the sum of the input power, and the input power calculation unit is the peak suppression unit the average input power level respectively calculates for each carrier before the input to the average for each carrier after the output power calculating unit is output from the peak suppressing section Each calculates the force power level, monitoring unit for each carrier, and determines a gain value based on the average output power level calculated by the calculated average input power level and the output power calculating unit with input power calculating unit, A gain value is output as level control information for controlling the signal level of each carrier, and the level adjustment unit is a transmitter that adjusts the level of each carrier based on the corresponding level control information for each carrier. Corresponding to the fluctuation of the input level, the fluctuation of the level after suppressing the power level of the carrier can be suppressed for each carrier on average, and as a result, the fluctuation of the level of the multicarrier signal can be suppressed on average. There is.

According to the present invention, there is provided a transmitter that suppresses fluctuations in the input level of a multicarrier signal obtained by combining a plurality of carriers, and a peak suppressor and an instantaneous power that is the sum of the power levels of each carrier input The presence or absence of a peak is detected by comparing the ratio with the average power with a preset peak factor threshold, and when a peak is detected, a multiplication coefficient corresponding to the sum of the power levels is uniformly multiplied for each carrier. Output the carrier with the power level of each carrier suppressed so that the combined power of each carrier becomes the specified power, and the input power calculation unit inputs the average sum of each carrier before input to the peak suppression unit calculates the power level, calculates the average output power level of the sum for each carrier output power calculating section is output from the peak suppression unit, monitoring unit input power calculating In determining a gain value based on the average output power level of the sum which is calculated average input power level of the computed sum as an output power calculation section, a gain value as a level control information for controlling the signal level of the multicarrier signal Since the output is a transmitter that adjusts the level of the multicarrier signal based on the level control information output from the monitoring unit, the level adjustment unit performs level control of the multicarrier signal from the average power of the sum of a plurality of carriers. Thus, there is an effect that the fluctuation of the level of the multicarrier signal can be suppressed corresponding to the fluctuation of the input level of the carrier.

According to the present invention, a transmitter that suppresses fluctuations in the input level of a multicarrier signal obtained by combining a plurality of carriers, and the instantaneous power and average of the power levels of the multicarrier signal to which a peak suppression unit is input. The presence or absence of a peak is detected by comparing the ratio with the power with a preset peak factor threshold, and when a peak is detected, the multicarrier is multiplied by a multiplication coefficient corresponding to the power level. Outputs a multi-carrier signal with the power level suppressed so that the power becomes the specified power, and the input power calculation unit calculates the average input power level for the multi-carrier signal before input to the peak suppression unit, and the output power calculation unit There calculates the average output power level for a multi-carrier signals output from the peak suppression unit, operation monitoring unit with input power calculating section Determines a gain value based on the average output power level calculated average input power level and the output power calculating unit which outputs the level control information for controlling the signal level of the multicarrier signal, level adjusting unit monitoring unit Since the transmitter adjusts the level of the multicarrier signal based on the level control information output from the receiver, there is an effect that the fluctuation in the level after peak suppression can be suppressed in response to the fluctuation in the input level of the multicarrier. .

Embodiments of the present invention will be described with reference to the drawings.
The function realizing means described below may be any circuit or device as long as it can realize the function, and part or all of the function can be realized by software. is there. Furthermore, the function realizing means may be realized by a plurality of circuits, and the plurality of function realizing means may be realized by a single circuit.

The transmitter according to the embodiment of the present invention can be roughly classified into four types.
The first type is a transmitter that transmits a multi-carrier signal in which a plurality of carriers are combined by peak power suppression, band limitation, and quadrature modulation (collectively referred to as digital signal processing). Based on the average input power (and possibly the average power after digital signal processing of the carrier), carrier level adjustment for adjusting the signal level of the carrier after digital signal processing is performed, or the average input of a specific carrier Perform multi-carrier level adjustment to adjust the signal level of the multi-carrier signal based on the power (and possibly the average output power after digital signal processing of the carrier), or both carrier level adjustment and multi-carrier level adjustment It is a transmitter that performs.
The first type transmitter will be described in detail as first to fourth embodiments.

The second type is a transmitter for transmitting a multicarrier signal in which a plurality of carriers are combined by peak power suppression, band limitation and quadrature modulation, and an average input power (and possibly a multicarrier signal depending on the case). The average output power of the transmitter) adjusts the signal level of the multicarrier signal.
The second type transmitter will be described in detail as fifth and sixth embodiments.

The third type is a transmitter that transmits a multicarrier signal in which a plurality of carriers are combined by peak power suppression, band limitation, and orthogonal modulation, and for each carrier, average input power before carrier peak power suppression, and In some cases, the transmitter adjusts the signal level of the signal of which the peak power of the carrier is suppressed, based on the average output power after the peak power of the carrier is suppressed.
The third type transmitter will be described in detail as a seventh embodiment.

In the fourth type, in a transmitter that transmits a multicarrier signal in which a plurality of carriers are band-limited and orthogonally modulated and combined to suppress peak power, the average input power before multicarrier peak power suppression (and, This is a transmitter that adjusts the signal level of the multicarrier peak power-suppressed signal based on the case (average output power after multicarrier peak power suppression).
The fourth type of transmitter will be described in detail as an eighth embodiment.

In each type of transmitter, there are the following three methods for determining the level control amount for adjusting the signal level of the carrier or multicarrier signal.
The first method is a method of calculating an average input power and an average output power of a carrier or multicarrier signal, and calculating and determining a level control amount from the calculated average input power and average output power. This is called “feedforward control by calculation”.
The second method determines the level control amount corresponding to the average input power of the carrier or multicarrier signal using a table in which the estimated value of the average input power of the carrier or multicarrier signal is associated with the level control amount. This method is called “feed-forward control by table”.
The third method uses a table in which an estimated value of average input power of a carrier or multicarrier signal is associated with an ideal value of average output power, and an average output corresponding to the average input power of the carrier or multicarrier signal. This is a method of identifying the ideal value of power and converging to an appropriate level control amount while adjusting the level control amount so that the actual average output power is equal to the ideal value. This method is called `` feedback control by table ''. Call it.
Details of each method will be described in each example.

  In the description of the embodiments of the present invention, the monitoring units 18, 32, 41, the signal level adjusting unit 15 and the multiplier 31 in each figure correspond to the adjusting means in the claims. The signal level adjusting unit 15 or the multiplier 31 corresponds to the level adjusting unit in the claims.

Before describing the transmitter according to the embodiment of the present invention, a transmission amplifier using the transmitter of the present invention will be described.
A transmission amplifier in which the transmitter of the present invention is used (hereinafter referred to as the present transmission amplifier) has almost the same configuration as the conventional CDMA base station transmission amplifier shown in FIG. That is, this transmission amplifier includes a transmitter 1, a D / A converter 2, a frequency conversion unit 3, and a power amplification unit 4.
This transmission amplifier modulates n (n> 2) carriers in a CDMA communication system base station, combines the carriers to generate and amplify a multicarrier signal, and performs radio transmission.
This transmission amplifier is different from the conventional CDMA base station transmission amplifier in carrier level control in the transmitter 1.

The transmitter 1 performs spread modulation, band limitation and orthogonal modulation on transmission data of a plurality of carriers that are digital signals, and further synthesizes each carrier (only the I-phase component) to form a D / A converter as a multicarrier signal. Output to 2.
Further, the transmitter 1 performs adjustment control of the level of the multicarrier signal based on the input level of each carrier. Details of the adjustment control will be described in the description of the transmitter.

The D / A converter 2 converts the multicarrier signal from the transmitter 1 into an analog signal and outputs the analog signal to the frequency converter 3.
The frequency conversion unit 3 converts the multicarrier signal into a radio frequency used for radio transmission and outputs the radio frequency to the power amplification unit 4.
The power amplifying unit 4 amplifies the multicarrier signal converted to the radio frequency and performs radio transmission via an antenna (not shown).

As another configuration of the transmission amplifier using the transmitter of the present invention, as shown in FIG. 18, the transmitter 1 ′ performs spread modulation, band limitation and orthogonality on the transmission data of a plurality of carriers which are digital signals. Modulation is performed, and the respective carriers are combined to output respective I-phase and Q-phase components as multi-carrier signals. D / A converters 2'-1, 2 'provided for the respective I-phase and Q-phase components -2 each analog-converted, the analog-converted multicarrier signal is converted to a radio frequency used for radio transmission in the analog quadrature modulation unit 3 ', amplified by the power amplification unit 4, and via an antenna (not shown) You may use for the structure which performs radio | wireless transmission.
FIG. 18 is a block diagram showing another configuration of a transmission amplifier used in a general CDMA base station.

Next, each form of the transmitter of the present invention corresponding to the transmitters 1 and 1 'of the present transmission amplifier will be described by type.
First, a transmitter belonging to the first type of the present invention will be described.
A transmitter belonging to the first type of the present invention will be described in terms of means configuration. An input power calculation unit that calculates an average input power of each carrier, and an average output power that is an average power after band limitation of each carrier is calculated. The output power calculation unit and the carrier with the maximum average input power of each carrier are identified, the maximum value is obtained, the average output power of the identified carrier is further obtained, and the obtained average input power and average output are obtained. The power ratio is obtained, and the level control information that is a ratio between the ratio and a preset expected value is output by the monitoring unit, and the level control information output from the monitoring unit is multiplied to obtain the level of the multicarrier signal. And a signal level adjustment unit for adjusting, and thereby, fluctuations in the level of the multicarrier signal can be suppressed on average in response to fluctuations in the input level of the carrier.

  In addition, a multiplier for multiplying the carrier after band control and the gain value is provided for each carrier, and the monitoring unit obtains a ratio between the average input power and the average output power for each carrier, and the ratio and a preset expected value The gain value of each carrier is calculated on the basis of the ratio to and output to the corresponding multiplier, which can suppress the fluctuation of the level after band limitation of the carrier on an average basis for each carrier. Variations in the level of the carrier signal can be suppressed on average.

  In addition, a table in which the estimated value of the average input power of the carrier is associated with the level control amount or the gain value is used as another method for determining the multi-carrier level control information or the gain value of each carrier in the monitoring unit. Or a table in which an estimated value of average input power of a carrier and an ideal value of average output power of a multicarrier signal or carrier are used, so that the average output power becomes equal to the ideal value. Since a method for adjusting and determining the level control amount or the gain value is realized, the level fluctuation of the carrier after the band limitation of the carrier can be suppressed on an average by simple control, and the level of the multicarrier signal can be suppressed. Variation can be suppressed on average.

  Examples of specific configurations of transmitters belonging to the first type of the present invention will be described in Examples 1 to 4.

  The transmitter according to the first embodiment of the present invention is a transmitter that adjusts a transmission signal level of a multicarrier signal in which a plurality of carriers are combined by band limitation and orthogonal modulation, and among the plurality of carriers, A monitoring unit that outputs a level control amount that is a ratio between an input / output level ratio that is a ratio of an average input level and an average output level of a carrier selected under a specific condition, and a preset expected value; and a multicarrier signal Since the transmitter is equipped with a level adjustment unit that performs level adjustment by multiplying the level control amount, fluctuations in the level of the multicarrier signal can be suppressed in response to fluctuations in the carrier input level. is there.

  In addition, the transmitter according to the first embodiment of the present invention is a transmitter that adjusts the transmission signal level of a multicarrier signal in which a plurality of carriers are combined by band limitation and orthogonal modulation, and is an average input of carriers. An assumed value corresponding to an average input level of a carrier selected under a specific condition among a plurality of carriers, having a table in which an assumed level value and a level control amount of a multicarrier signal are stored in association with each other Since the transmitter is equipped with a monitoring unit that reads and outputs the corresponding level control amount from the table, and a level adjustment unit that performs level adjustment by multiplying the multicarrier signal by the level control amount, fluctuations in the input level of the carrier In response to the above, fluctuations in the level of the multicarrier signal can be suppressed.

First, a configuration example of a transmitter (hereinafter referred to as a first transmitter) according to a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a configuration block diagram of a first transmitter.
The first transmitter includes carrier code multiplexed signal generation units 10-1 to 10-n, a peak power suppression unit 11, waveform shaping filters 12-1 to 12-n, and digital orthogonal modulation units 13-1 to 13-13. -n, adder 14, signal level adjustment unit 15, input power calculation units 16-1 to 16-n, output power calculation units 17-1 to 17-n, and monitoring unit 18 .

Next, the configuration of each part of the first transmitter will be described.
Carrier code multiplexed signal generators 10-1 to 10-n are provided for each carrier, and store a spreading code corresponding to the carrier in advance.
Carrier code multiplexed signal generators 10-1 to 10-n perform spread modulation using a stored spread code when transmission data of the corresponding carrier is input in units of channels, and transmit data after spread modulation. Are divided into an in-phase component (hereinafter referred to as I component) and a quadrature component (hereinafter referred to as Q component), and output to the peak power suppression unit 11.

The peak power suppression unit 11 performs carrier power limitation based on the level of the carrier after spreading modulation output from each of the carrier code multiplexed signal generation units 10-1 to 10-n, and supports each carrier after limitation. Output to the waveform shaping filters 12-1 to 12-n.
The peak power suppressing unit 11 is a limiter similar to the conventional one, and particularly important here is to suppress the peak factor when the multicarriers after combining the carriers are input to the power amplifying unit 4 in the transmission amplifier. As possible, peak detection is performed based on the power synthesized using each input carrier, and when a peak is detected, the power is limited with a uniform suppression rate for each carrier. It is.
Details of the operation of the peak power suppression unit 11 will be described later.

The waveform shaping filters 12-1 to 12-n are provided for each carrier, perform band limitation on the limited carrier output from the peak power suppression unit 12, and perform the corresponding digital orthogonal modulation unit 13-1. Output to ~ 13-n.
The waveform shaping filters 12-1 to 12-n perform spectrum shaping so that the occupied band of the corresponding carrier falls within a preset value by performing band limitation.

The digital quadrature modulation units 13-1 to 13-n are provided for each carrier, perform quadrature modulation on the band-limited carriers output from the corresponding waveform shaping filters 12-1 to 12-n, and perform quadrature modulation. Are output to the adder 14. Further, both the I and Q components after quadrature modulation are output to the corresponding output power calculation units 17-1 to 17-n.
The adder 14 synthesizes the I component of the carrier after quadrature modulation output from each of the digital quadrature modulation units 13-1 to 13-n, and outputs the resultant signal to the signal level adjustment unit 15 as a multicarrier signal.
The signal level adjustment unit 15 performs level adjustment control on the multicarrier signal from the adder 14 based on level control information output from the monitoring unit 18 described later.

  The input power calculation units 16-1 to 16-n are provided for each carrier, and based on the power values of the carriers after spreading modulation output from the carrier code multiplexed signal generation units 10-1 to 10-n, The average input power of the corresponding carrier is calculated and output to the monitoring unit 18. A method of calculating the average input power in the input power calculation units 16-1 to 16-n will be described later.

The output power calculation units 17-1 to 17-n are provided for each carrier, and the power of the carrier (I and Q components) after the orthogonal modulation output from the digital orthogonal modulation units 13-1 to 13-n. Based on the value, the average output power of the corresponding carrier is calculated and output to the monitoring unit 18. A method for calculating the average output power in the output power calculators 17-1 to 17-n will be described later.
In the input power calculation units 16-1 to 16-n and the output power calculation units 17-1 to 17-n, the delay time of the input of the average input power and the average output power to the monitoring unit 18 and the averaging time are considered. The configuration for the averaging operation and the method for the averaging operation are preferably the same.

Based on the average input power output from the input power calculation units 16-1 to 16-n and the average output power output from the output power calculation units 17-1 to 17-n, the monitoring unit 18 Parameters relating to signal level adjustment are calculated and output to the signal level adjustment unit 15 as level control information.
Details of the calculation method of the level control information in the monitoring unit 18 will be described later.

Next, the operation of the first transmitter will be described.
In FIG. 1, transmission data of each carrier, which is a digital signal, is input to carrier code multiplexed signal generation units 10-1 to 10-n corresponding in a transmitter in units of channels. In carrier code multiplexed signal generators 10-1 to 10-n, transmission data is subjected to spread modulation with a spread code stored in advance, synthesized, and then output to peak power suppression unit 11 for each IQ component. The

When a carrier after spread modulation is input, the peak power suppression unit 11 calculates instantaneous power and average power with respect to the total power of the carrier, obtains the ratio thereof, and calculates the calculated ratio as a preset peak factor. The presence or absence of a peak is detected by comparing with a threshold value, and the carrier level is adjusted based on the comparison result.
Here, the calculation method of the instantaneous power and the average power with respect to the total power of the carrier will be described using mathematical expressions. The input signal of each carrier is shown by the following formula (1).

  The peak power suppression unit 11 first synthesizes and multiplexes the input carriers. The carrier multiplexing process can be expressed as the following equation (2).

In Equation (2), A _i (t) and A _q (t) represent the in-phase component multiplexing result and the quadrature component multiplexing result of the input signal, respectively.
When the expression (2) is used, the instantaneous power and the average power with respect to the total power of each carrier can be expressed as the following expressions (3) and (4).

  In the equation (4), T indicates the number of objects to be averaged among the past instantaneous power values, and is a value set in advance by the peak power suppression unit 11. The peak power suppressing unit 11 stores the instantaneous power value in a storage unit (not shown) every time it calculates the instantaneous power value, and reads it from the storage unit when calculating the average power.

The peak power suppression unit 11 detects the presence or absence of a peak by obtaining an instantaneous power-to-average power ratio (hereinafter referred to as an instantaneous average power ratio) of the total power of the carrier and comparing it with a preset peak factor threshold.
The peak factor threshold value used in the peak power suppression unit 11 is a fixed value that depends on the number of carriers. The peak factor threshold is optimized when each carrier is at the maximum level, but the peak power suppression unit 11 performs peak suppression even when all carriers are not at the maximum level.

If the instantaneous average power ratio is large compared to the peak factor threshold as a result of the comparison, the peak power suppression unit 11 determines that the carrier should be limited, and the combined power of each carrier is specified. Then, the power of each carrier is limited so as to be equal to the power of the waveform and output to the corresponding waveform shaping filters 12-1 to 12-n. Specifically, power limitation (peak limitation) is performed by uniformly multiplying each carrier by a multiplication coefficient corresponding to the total power.
If the instantaneous average power ratio is small compared to the peak factor threshold, each carrier is output to the waveform shaping filters 12-1 to 12-n without limiting the power.

As described in the problem, since each carrier performs band limitation after peak limitation, the peak factor of the carrier after band limitation becomes larger than that before band limitation, and therefore the output characteristics of the power amplifying unit 4 become nonlinear and nonlinear. Distortion occurs.
The peak power suppression unit 11 detects the peak based on the instantaneous power and the average power with respect to the total power of the carrier in order to suppress the maximum power of the multicarrier signal input to the power amplification unit 4, and when the peak is detected In addition, the power value of each carrier is limited and output, whereby the peak factor of the multicarrier signal can be reduced, and the occurrence of nonlinear distortion in the power amplifying unit 4 is prevented.

As described above, the first transmitter uses the peak power suppression unit 11 that limits the peak of each carrier with reference to the peak factor threshold, and is intended to limit the peak of the multicarrier signal. If there is, a method for limiting the peak by another method, for example, a method for limiting the peak of each carrier based on the power threshold may be used.
In the peak restriction based on the power threshold, the peak power suppression unit 11 sets the power threshold in advance, and exceeds the power threshold when the power value of the combined multi-carrier signal exceeds the power threshold. The power of each carrier is limited to limit the amount of power.

  In FIG. 1, each carrier output from the peak power suppression unit 11 is band-limited by the corresponding waveform shaping filters 12-1 to 12-n, and the digital quadrature modulation units 13-1 to 13-n. After quadrature modulation, the I component is combined by the adder 14 and output to the signal level adjustment unit 15 as a multicarrier signal.

Further, each carrier subjected to spread modulation by the carrier code multiplexed signal generation units 10-1 to 10-n is input to the corresponding input power calculation units 16-1 to 16-n in addition to the peak power suppression unit 11.
The input power calculation units 16-1 to 16-n calculate average input power that is the average power of each carrier based on the input carriers, and output the average input power to the monitoring unit 18.

  Here, the calculation method of the average input power in the input power calculation units 16-1 to 16-n will be described using mathematical expressions. The input power calculation unit 16 first calculates the power value of the input carrier. If the carrier input signal is represented by equation (1), the power Pow of the input signal can be represented by equation (5) below.

  Next, the input power calculation unit 16 calculates the average power using the calculated power value Pow. The input power calculation unit 16 performs a weighted averaging calculation process represented by the following equation (6) using a weight coefficient λ (0 ≦ λ ≦ 1) stored in advance.

  In the formula (6), AvgW (t−1) indicates the calculation result of the weighted averaging calculated immediately before. The input power calculation unit 16 stores the weighted calculation result in a built-in storage unit (not shown) every time it calculates the weighted calculation result, and reads it from the storage unit during a new weighting calculation.

  Further, the input power calculation unit 16 performs the averaging process shown in the following formula (7) using the calculation result of the formula (6).

In the equation (7), x indicates the number of objects to be averaged among the past weighted average calculation results, and is a value set in advance by the input power averaging unit 16. The input power averaging unit 16 stores the weighting calculation result in the storage unit every time it is calculated, and reads it from the storage unit when calculating the average power.
Then, the input power averaging unit 16 outputs the average power Avg (t) calculated by the equation (7) to the monitoring unit 18 as the average input power. The above is the calculation method of the average input power in the input power averaging unit 16.

In addition, both the I and Q components of each carrier that are quadrature modulated by the digital quadrature modulation units 13-1 to 13-n are the adder 14 (only the I component) and the corresponding output power calculation units 17-1 to 17-17. Input to -n. The output power calculation units 17-1 to 17-n calculate the average output power, which is the average power after band limitation of each carrier, based on the input carriers and output the average output power to the monitoring unit 18.
The calculation method of the average output power in the output power calculation units 17-1 to 17-n is the average input in the input power calculation units 16-1 to 16-n described above except that the power value of the carrier after quadrature modulation is used. Since it is the same as the calculation method of electric power, description is abbreviate | omitted.

Based on the average input power output from the input power calculation units 16-1 to 16-n and the average output power output from the output power calculation units 17-1 to 17-n, the monitoring unit 18 Parameters relating to signal level adjustment are calculated and output to the signal level adjustment unit 15 as level control information.
The monitoring unit 18 described here realizes “feedforward control by calculation” which is a first method for determining a level control amount for adjusting the signal level of the multicarrier signal.

Hereinafter, a method for calculating the level control information in the monitoring unit 18 will be described with reference to FIGS. 9 and 10. 9 and 10 are flowcharts of the level control information calculation process in the monitoring unit 18 of the first transmitter.
Note that (A) in the flowchart of FIG. 9 is connected to (A) in the flowchart of FIG.

  The monitoring unit 18 monitors the operation status of the input power calculation units 16-1 to 16-n and the output power calculation units 17-1 to 17-n by monitoring the average input power and average output power values and output status. Monitoring. By monitoring the operation status, the monitoring unit 18 can know, for example, the current number of carriers.

In FIG. 9, the monitoring unit 18 acquires the maximum value A (t) from the average input power output at the same timing from the input power calculation units 16-1 to 16-n by monitoring the operation status ( S11). Next, the monitoring unit 18 specifies the carrier F (t) having the maximum average input power by specifying the input power calculation unit 16 from which the maximum value A (t) is output (S12), and further performs processing S12. The average output power B (t) output from the output power calculation unit 17 corresponding to the carrier specified in (1) is acquired (S13).
Here, when the first transmitter handles one carrier, the monitoring unit 18 only needs to acquire the input average input power and the average output power instead of the processes S11 to S13.

Then, the monitoring unit 18 checks whether or not the maximum value A (t) of the average input power is 0, that is, there is no carrier (S14), and if it is other than 0 (No in S14), the corresponding average output power It is checked whether B (t) is less than a preset threshold value (S15).
Here, the comparison determination between the average output power B (t) and the threshold value in S15 is a process necessary for the device configuration, and the threshold value is a value set in the monitoring unit 18 in advance.
The reason necessary for the device configuration is that the accuracy of level adjustment deteriorates when the transmission level of the monitoring data (here, the carrier having the maximum average input power) becomes low, so that the accuracy deterioration is stopped at a specific level.
In particular, when the gain calculation is performed in steps S17, S18, and S19, which will be described later, when the average output power B (t) corresponding to the divisor of S18 is small and approaches 0, the calculation result diverges, so the maximum average output power When B (t) is less than the threshold value, the calculation processing of S17, S18, and S19 is avoided.

In process S15, if B (t) is equal to or greater than the threshold value (B (t) ≧ threshold value) (No in S15), the monitoring unit 18 determines that level control of the multicarrier signal is possible, and calculates level control information. I do.
In calculating the level control information, the monitoring unit 18 first multiplies A (t) by a coefficient α (S17), and further divides C (t) as a multiplication result by B (t) (S18), and D (T) is obtained. Therefore, the arithmetic processing in the processes S17 and S18 can be expressed as D (t) = α · A (t) / B (t). Hereinafter, A (t) / B (t) is referred to as an input / output power ratio.

Here, the coefficient α (α> 0) is a value determined by the power value of the carrier, and is set in the monitoring unit 18 in advance. In determining the coefficient α, the monitoring unit 18 obtains the input / output power ratio of the reference data of the carrier power value (for example, the power value not subject to peak control in the peak power suppressing unit 11), and this reciprocal is defined as α. Yes.
Therefore, D (t) can be said to represent the ratio of the input / output power ratio (A (t) / B (t)) of the measured data to the input / output power ratio 1 / α of the reference data. Hereinafter, D (t) is referred to as a reference actual measurement ratio.

  And the monitoring part 18 takes the square root of the reference | standard measurement ratio D (t) obtained by process S19, and makes it gain value GAIN (t) (S19). The gain value GAIN (t) is a parameter related to the level adjustment of the multicarrier signal.

  In process S14, A (t) is 0, that is, when there is no carrier (Yes in S14), or in process S15, if B (t) is less than the threshold value (B (t) <threshold value) (S15 Yes), the monitoring unit 18 sets the gain value GAIN (t−1) used immediately before as the gain value GAIN (t) (S16).

  In FIG. 10, the monitoring unit 18 next checks whether GAIN (t) is larger than the upper limit value (S20). If GAIN (t) is larger than the upper limit value (GAIN (t)> upper limit value) in process S20 (Yes in S20), the monitoring unit 18 replaces the value of GAIN (t) with the upper limit value (S21). If GAIN (t) is less than or equal to the upper limit value (GAIN (t) ≦ upper limit value) (No in S20), it is next checked whether or not GAIN (t) is less than the lower limit value (S22).

In process S22, if GAIN (t) is less than the lower limit (GAIN (t) <lower limit) (Yes in S22), the monitoring unit 18 replaces the value of GAIN (t) with the lower limit (S23), If it is equal to or greater than the value (GAIN (t) ≧ lower limit value) (No in S22), the current GAIN (t) is used as it is, and the value of GAIN (t) is determined.
Here, the upper limit value and the lower limit value of GAIN (t) are values determined by the power value of the carrier and the number of operating carriers, and are set in the monitoring unit 18 in advance.

  When the gain value GAIN (t) is determined, the monitoring unit 18 outputs GAIN (t) to the signal level adjustment unit 15 as level control information (S24). The above is the calculation process of the level control information in the monitoring unit 18.

  The monitoring unit 18 periodically performs the above-described level control information calculation process at a specified timing. In addition, the monitoring unit 18 stores the gain value GAIN (t) calculated at the past timing in a built-in storage unit (not shown), and reads it from the storage unit when calculating a new gain value.

In FIG. 1, the signal level adjustment unit 15 multiplies the multicarrier signal output from the adder 14 by the gain value GAIN (t) output from the monitoring unit 18 to adjust the level of the multicarrier signal. Do.
As described above, the monitoring unit 18 calculates GAIN (t) based on the square root of the input / output power ratio. Since the carrier power value is represented by the sum of squares of the in-phase component and the quadrature component, as shown in equation (5), a desired level adjustment can be performed by multiplying the multi-carrier signal by GAIN (t). it can.

  The level-adjusted multicarrier signal is subjected to analog conversion in the D / A converter 2 and radio frequency conversion in the frequency conversion unit 3, and then amplified in the power amplification unit 4 and wirelessly transmitted. The above is the operation of the first transmitter.

In the first transmitter, since the signal level adjustment unit 15 performs level adjustment according to the level of the multicarrier signal, the signal is output from the main line system (peak power suppression unit 11 to adder 14) of the first transmitter. The level control information corresponding to the multicarrier signal output from the multicarrier signal and the control system (input power calculation unit 16, output power calculation unit 17 and monitoring unit 18) is the signal level adjustment unit 15 at the same timing. Is preferably entered.
For this reason, a delay device or the like may be provided in the main line system or the control system to synchronize the data output of the main line system and the control system.

  According to the first transmitter, the control amount for level adjustment of the multicarrier signal after combining the carriers is calculated based on the average input power to the transmitter of each carrier and the average output power after band limitation. In addition, since the level adjustment of the multicarrier signal is performed using the control amount, the fluctuation of the level of the multicarrier signal can be suppressed on the average corresponding to the fluctuation of the input level of each carrier.

The normal peak power suppression unit performs peak control of each carrier according to the total power of the carriers. Therefore, even if there is a carrier whose input level to the transmitter varies greatly, if the power level of the entire carrier is less than the specified value, the peak control is not performed and the band is limited as it is and is combined. For this reason, the fluctuation of the level of the multicarrier signal may be severe.
In addition, when a carrier whose input level is fixed and a carrier whose input level varies are mixed, the frequency of peak control of the peak power suppression unit 11 increases due to the variation of the input level, and the input level is fixed. The peak restriction is also applied to the carrier that has been changed, and the level of the carrier whose input level is fixed is lowered.

As described above, when calculating the level control information, the monitoring unit 18 obtains the input / output power ratio of the carrier taking the maximum value of the average input power, and performs the reference actual measurement which is the ratio with the input / output power ratio in the reference data. Based on the ratio D (t), a gain value GAIN (t) is calculated.
That is, since the first transmitter calculates the gain value based on the average input / output power of the carrier and multiplies the multicarrier signal, the peak power suppression unit 11 does not sufficiently limit the peak to the carrier. If the level is excessively suppressed due to excessive peak restriction on the carrier, the total level of the multicarrier signal corresponding to any section (frame, etc.) using the reference data Can be approximated. Therefore, the first transmitter can stably suppress the fluctuation of the level of the multicarrier signal on average even if the fluctuation of the input carrier level occurs.

  Further, the first transmitter is realized by adding the input power calculation unit 16 and the output power calculation unit 17, the monitoring unit 18, and the signal level adjustment unit 15 corresponding to the number of carriers to the configuration of the conventional transmitter. it can. Therefore, since the first transmitter can use the facilities of the conventional transmitter as it is, the cost for installation can be reduced.

In the first transmitter, the monitoring unit 18 may set different conditions (for example, the second largest average input power) in addition to the maximum value as the condition of the average input power used for calculating the level control information. Good. Since each carrier is peak-limited by a common multiplication coefficient in the peak power suppression unit 11, the input / output power ratio is constant for any carrier.
However, when the accuracy of the average output power value in the output power calculation unit is low and smaller than the actual value, the error of the input / output power ratio increases. This tendency becomes remarkable especially when the value of the average output power is originally small. Therefore, since it is preferable that the average output power used in the calculation of the input / output power ratio is as large as possible, it is desirable to adopt the maximum value for the average input power.

  Next, the input / output characteristics of the carrier in the first transmitter and the conventional transmitter will be described with reference to FIGS. FIG. 4 is a graph showing characteristics relating to the input setting level and the output level deviation at the time of transmission of one carrier signal at the time of 32 code multiplexing in the first transmitter and the prior art transmitter, and FIG. 6 is a graph showing characteristics relating to an input setting level and an output level deviation at the time of transmission of 2 carriers of a 32 code multiplexed signal in the transmitter of FIG.

  As an explanation of FIGS. 4 and 5, the level difference from the expected output level value represents the level difference from the expected output level of the transmitter. That is, when the input level is increased linearly, the expected value is a value obtained by linearly increasing the output level. Further, the level correction amount is level control information set by the monitoring unit 18, and the amplitude of the output of the conventional transmitter is controlled by the subsequent signal level adjustment unit 15 based on the level control information. Specifically, it becomes equal to the output level in the first transmitter.

In the characteristic measurement shown in FIG. 4, the peak power suppression unit 11 used in the first transmitter and the conventional transmitter performs carrier level limitation, and the threshold value is a fixed value. As shown in FIG. 4, in the case of a conventional transmitter, if the input setting level is increased, the threshold value of the peak power suppression unit is exceeded correspondingly, and the amplitude is limited, so a deviation of about ± 0.2 dB is generated. Arise. In the first transmitter, the level control information is multiplied by the carrier in the signal level adjustment unit 15, whereby the deviation can be suppressed to about ± 0.1 dB. In addition, this ± 0.1 dB can be further reduced by changing (for example, increasing) the averaging time constant (x in equation (7)) of each power measurement unit.
Further, if the (bit) accuracy at the time of calculating the average power in each power measuring unit is improved, the gain value calculating accuracy in the monitoring unit 18 is improved, the accuracy of level control performed by the level control means 15 is improved, and the output power is improved. The error can be reduced.

In the measurement of the characteristics shown in FIG. 5, among the two carriers, the carrier 1 has a fixed input level and the input level of the carrier 2 is varied. Moreover, the peak power suppression unit 11 is designed to operate based on the total power of the carrier.
As shown in FIG. 5, in the case of the conventional transmitter, when the input setting level of the carrier 2 is increased, the operation frequency of the peak power suppression unit 11 increases, and the output level is constant even in the carrier 1 input at a constant level. It does not become and declines. Therefore, a deviation of about ± 0.3 dB occurs in the output level of the carrier 1.

On the other hand, in the first transmitter, similarly to the transmission at the time of one carrier in FIG. As a result, the output level of the carrier 1 can be suppressed to a deviation of about ± 0.05 dB.
From the graph of FIG. 5, it can be seen that the first transmitter can realize power control equivalent to 0.1 dB or 0.5 dB even when there are a plurality of carriers in the W-CDMA communication system.

  That is, in the first transmitter, based on the average input power in a specific carrier and the average output power after a series of signal processing for each carrier such as peak suppression, band limitation, and quadrature modulation, the actual carrier power value and Since the multicarrier signal is subjected to level adjustment in accordance with the current operation status of the apparatus using the threshold value, upper limit value, and lower limit value determined by the number of operating carriers, the second and third problems described in the problem can be solved. .

Next, a transmitter according to a second embodiment of the present invention (hereinafter referred to as a second transmitter) will be described focusing on differences from the first transmitter. FIG. 2 is a configuration block diagram of the second transmitter. The same components as those of the first transmitter will be described with the same reference numerals.
The second transmitter is provided with a second peak power suppression unit 21 between the digital quadrature modulation units 13-1 to 13-n and the adder 14. The configuration of the second peak power suppression unit 21 is the same as that of the peak power suppression unit 11. In the second transmitter, the output power calculators 17-1 to 17-n calculate average output power for each carrier peak-limited by the second peak power suppressor 21.

According to the second transmitter, the second peak power suppressing unit 21 performs peak limitation on each carrier after band limitation in the waveform shaping filters 12-1 to 12-n, and thereby band limitation. Thus, the level of the protruding portion can be suppressed with respect to the carrier having an increased peak factor, that is, a level protruding.
Therefore, the monitoring unit 18 performs the calculation process of the level control information based on the average output power of the carrier that has already been subjected to the peak control, and outputs the calculated level control information to the signal level adjustment unit 15. The fluctuation of the signal level can be suppressed on average.

  A transmitter according to a third embodiment of the present invention is a transmitter that adjusts a transmission signal level of a multicarrier signal in which a plurality of carriers are band-limited and quadrature-modulated and combined. A monitoring unit that outputs a level control amount that is a ratio between an input level, an input / output level ratio that is a ratio of an average output level after band limitation and quadrature modulation, and a preset expected value, and band limitation and quadrature modulation Since each transmitter is provided with a multiplier that multiplies a corresponding level control amount for each subsequent carrier, fluctuations in the level after band limitation of the carrier can be suppressed on an average basis for each carrier. The fluctuation of the signal level can be suppressed on average.

  A transmitter according to a third embodiment of the present invention is a transmitter that adjusts the transmission signal level of a multicarrier signal in which a plurality of carriers are combined by band limitation and orthogonal modulation, and has an average input level of carriers. It has a table in which an assumed value and a control value related to carrier level adjustment obtained based on an assumed value of an average input level are stored in association with each other, and corresponds from an assumed value corresponding to the average input level of each carrier. A monitoring unit that reads a control value from the table and outputs a level control amount of each carrier based on the control value, and a multiplication unit that multiplies the corresponding level control amount for each carrier after band limitation and quadrature modulation. Since it is a transmitter, fluctuations in the level after carrier band limitation can be suppressed on an average basis for each carrier, and fluctuations in the level of multicarrier signals can be reduced. One in which it is possible to suppress the manner.

  In the transmitter, the monitoring unit is a monitoring unit that outputs a specific level control amount among the level control amounts corresponding to each carrier as a multi-carrier level control amount, and the multi-carrier level control amount is a multi-level control amount. Since the transmitter is equipped with a level adjustment unit that performs level adjustment by multiplying the carrier signal, level fluctuation after carrier band limitation is averaged for each carrier, and level fluctuation of the multicarrier signal is averaged. Can be suppressed.

Next, a transmitter according to a third embodiment of the present invention (hereinafter referred to as a third transmitter) will be described focusing on differences from the first transmitter. FIG. 3 is a configuration block diagram of the third transmitter. The same components as those of the first transmitter will be described with the same reference numerals.
In the third transmitter, multipliers 31-1 to 31-n corresponding to the respective carriers are provided between the digital quadrature modulation units 13-1 to 13-n and the adder 14. In addition to calculating level control information and outputting it to the signal level adjusting unit 15, the monitoring unit 32 calculates a gain value for each carrier subjected to digital quadrature modulation and outputs the gain value to the multipliers 31-1 to 31-n. To do.
The monitoring unit 32 described here is a first method for determining a gain value and a level control amount for adjusting the multicarrier signal level in order to adjust the signal level of each carrier, “feedforward control by calculation”. Is realized.

  Here, a method of calculating the level control information and the gain value for each carrier in the monitoring unit 32 of the third transmitter will be described with reference to FIGS. FIG. 12 is a flowchart of level control information and gain value calculation for each carrier in the monitoring unit 32 of the third transmitter, and FIGS. 13 and 14 show carrier gain value calculation processing in the monitoring unit 32. It is a flowchart. Note that (A) in the flowchart of FIG. 13 is connected to (A) in the flowchart of FIG.

In calculating the level control information and the gain value of each carrier, the monitoring unit 32 1) calculates only the level control information, 2) calculates only the gain value of each carrier, 3) the level control information and the gain of each carrier Which process is to be performed among the calculation of both values is set in advance (hereinafter, calculation target is set).
In the processes 1) to 3), it is known that there is a difference in the accuracy of the level of the multicarrier signal or carrier after level adjustment, and the accuracy is improved in the order of 3), 2), and 1). For this reason, it is desirable to determine which processing of 1) to 3) is performed in the monitoring unit 32 according to the accuracy of the transmission power level required for each carrier.
As a process setting method, the monitoring unit 32 may be set to perform only a specific process in advance, or an administrator may manually select a process and set the monitoring unit 32.

  In FIG. 12, the monitoring unit 32 first confirms whether or not the setting for calculating the gain value of each carrier is made by confirming the setting contents of the calculation target (S41). In the process S41, when it is confirmed that the setting is made so that only the level control information of 1) is calculated (No in S41), the monitoring unit 32 performs the level control information in accordance with the procedure of the flowcharts shown in FIGS. A calculation process is performed and output to the level signal adjustment unit 15 (S42), and the calculation process of the level control information is terminated.

In the process S41, when it is confirmed that only the gain value of each carrier in 2) is calculated or that both the level control information in 3) and the gain value of each carrier are set to be calculated, the monitoring unit 32 The gain value of each carrier is calculated (S43).
In the process S43, the monitoring unit 32 compares the average input power of each carrier output from the input power calculation units 16-1 to 16-n and each carrier output from the input power calculation units 17-1 to 17-n. Based on the average output power, a gain value is calculated for each carrier. A detailed calculation method of the gain value of each carrier will be described later.

  The gain value of each carrier calculated by the monitoring unit 32 is output to the corresponding multipliers 31-1 to 31-n (S44), and is multiplied with the carrier after band limitation and digital orthogonal modulation. The multiplication results of the multipliers 31-1 to 31-n are combined by the adder 14 and output to the signal level adjustment unit 15 as a multicarrier signal.

Next, the monitoring unit 32 confirms whether or not the level control information is set to be calculated by confirming the setting content of the calculation target (S45). In the process S45, when it is confirmed that the setting is made to calculate only the gain value of each carrier in 2) (No in S45), the monitoring unit 32 ends the calculation process of the gain value of each carrier.
In the process S45, when it is confirmed that the level control information of 3) and the gain value of each carrier are set (Yes in S45), the monitoring unit 32 determines the maximum value among the gain values calculated in the process S43. Is determined as level control information, and is output to the level signal adjustment unit 15 (S46), and the calculation process is terminated.

  In the process S46, the monitoring unit 32 may set a different condition (for example, the second largest gain value) as the condition of the gain value as the level control information. However, as described in the first transmitter, It is desirable to employ the maximum value for the average input power used for the input / output power ratio.

  Next, gain value calculation processing for each carrier will be described with reference to FIGS. 13 and 14. FIGS. 13 and 14 show processing when the gain value for carrier n is calculated, but the monitoring unit 32 performs the same processing for other carriers and calculates the gain value. .

The monitoring unit 32 monitors the values of the average input power and the average output power and the output status, thereby determining the operation status of the input power calculation units 16-1 to 16-n and the output power calculation units 17-1 to 17-n. Monitoring.
In FIG. 13, the monitoring unit 32 acquires the average input power A (t) output from the input power calculation unit 16-n among the input power calculation units 16-1 to 16-n by monitoring the operation status. (S51). Next, the monitoring unit 32 acquires the average output power B (t) output from the output power calculation unit 17-n (S52).

Then, the monitoring unit 32 checks whether or not the maximum value A (t) of the average input power is 0, that is, the carrier n does not exist (S53). If it is not 0 (No in S53), the corresponding average output It is confirmed whether or not the power B (t) is less than a preset threshold value (S54).
Here, the comparison determination between the average output power B (t) and the threshold value in S54 is a process necessary for the apparatus configuration as in the case of FIG. 9, and the threshold value is a value set in the monitoring unit 18 in advance. It is.

In process S54, if B (t) is equal to or greater than the threshold (B (t) ≧ threshold) (No in S54), the monitoring unit 32 determines that the level control of the carrier n is possible, and determines the gain value for the carrier n. Perform the calculation.
As in the case of the level control information, the monitor unit 32 multiplies A (t) by the coefficient α (S56), and further divides C (t), which is the multiplication result, by B (t). (S57) A reference actual measurement ratio D (t) is obtained.

  Here, the coefficient α (α> 0) is a value determined by the power value of the carrier n as in the case of the level control information, and is set in the monitoring unit 32 in advance. In determining the coefficient α, the monitoring unit 32 obtains the input / output power ratio of the reference data of the power value of the carrier n, and this reciprocal is set to α.

Then, the monitoring unit 32 calculates the gain value GAIN _n (t) by taking the square root of the reference actual measurement ratio D (t) obtained in step S58 and further multiplying by the correction coefficient β (S58).
Here, the correction coefficient β (β> 0) is a correction coefficient considering the frequency difference of each carrier, and is set in the monitoring unit 32 in advance. The gain value GAIN _n (t) is a parameter related to the level adjustment of the carrier n.

If A (t) is 0 in process S53, that is, if carrier n does not exist (Yes in S53), or if B (t) is less than the threshold value (B (t) <threshold value) in process S54 (S54). of Yes), the monitoring unit 32, as the gain value gAIN _n (t), to set the gain value gAIN _n (t-1) which was used immediately before (S55).

In FIG. 14, the monitoring unit 32 next checks whether GAIN _n (t) is larger than the upper limit value (S59). If GAIN _n (t) is larger than the upper limit value (GAIN _n (t)> upper limit value) in process S59 (Yes in S59), the monitoring unit 32 replaces the value of GAIN _n (t) with the upper limit value. (S60), if GAIN _n (t) is less than or equal to the upper limit (GAIN _n (t) ≦ upper limit) (No in S59), then it is confirmed whether or not GAIN _n (t) is less than the lower limit ( S61).

If GAIN _n (t) is less than the lower limit (GAIN _n (t) <lower limit) in process S61 (Yes in S61), the monitoring unit 32 replaces the value of GAIN _n (t) with the lower limit (S62). ), If it is equal to or greater than the lower limit (GAIN _n (t) ≧ lower limit) (No in S61), the current GAIN _n (t) is used as it is, and the value of GAIN _n (t) is determined.
Here, the upper limit value and the lower limit value of GAIN _n (t) are values determined by the power value of the carrier and the number of operating carriers as in the case of the level control information, and are set in the monitoring unit 32 in advance.

When the value of the gain value GAIN _n (t) is determined, the monitoring unit 32 stores GAIN _n (t) in the storage unit built in (S63). The above is the gain value calculation processing for the carrier in the monitoring unit 32.

The monitoring unit 32 periodically performs processing for calculating the level control information and the gain value of each carrier at a specified timing. Further, the monitoring unit 32 stores the gain value GAIN (t) for the multicarrier signal calculated at the past timing and the gain value GAIN _n (t) for each carrier in a built-in storage means (not shown), and newly Is read from the storage means when calculating a large gain value.

According to the third transmitter, the monitoring unit 32 calculates level control information for the multicarrier signal, and calculates a gain value for each carrier based on the average input power and average output power of each carrier. The multipliers 31-1 to 31-n perform multiplication with the corresponding carriers after band limitation.
As a result, level adjustment is performed according to the level of each carrier. For example, for a carrier whose input level temporarily changes suddenly, level suppression performed uniformly by the peak power suppression unit 11 according to the change. In addition, for the carrier whose input level does not fluctuate, the level suppression uniformly performed by the peak power suppression unit 11 is recovered and the fluctuation of the output signal is reduced. Can be suppressed.
The third transmitter adjusts the level of each carrier after band limitation before combining the carriers to suppress carrier level fluctuations on average and further adjusts the level for the multicarrier signal. The fluctuation of the signal level can be suppressed on average.

In the above description, the first method (“feedforward control by calculation”) has been described as the method for determining the level control information or gain value in the monitoring units of the first to third transmitters. ("Feed forward control by table") will be described.
As a second method for determining the level control information or gain value in the monitoring units of the first to third transmitters, a table in which the assumed value of average input power and the level control information are configured in advance is used. Then, the level control information may be output.
The operation of the second method (“feedforward control by table”) will be described with reference to FIG. 11 using an example of the monitoring unit 18 of the first and second transmitters. FIG. 11 is a flowchart of level control information output processing using a table in the monitoring units of the first and second transmitters.

  In performing the above determination method, a table in which the assumed value of the average input power of the carrier and the gain value GAIN (t) are stored in association with each other is set in advance in the monitoring unit. The gain value GAIN (t) stores an optimum value of the gain value obtained by measurement when the average input power is an assumed value.

The monitoring unit monitors the operation status of the input power calculation units 16-1 to 16-n, and among the average input power output from the input power calculation units 16-1 to 16-n at the same timing, the maximum value A (T) is acquired (S31). Next, the monitoring unit specifies an assumed value corresponding to the maximum value A (t) among the assumed values of average input power stored in the table (S32). In the process S32, the monitoring unit specifically identifies an assumed value by selecting an assumed value that is closest to the maximum value A (t) from the assumed values stored in the table.
Then, the monitoring unit reads the gain value GAIN (t) corresponding to the specified assumed value (S33), and outputs it to the signal level adjustment unit 15 as level control information (S34). The above is the output process of the level control information using the table.

  In the monitoring unit 32 of the third transmitter, a table in which the assumed value of the average input power of the carrier and the gain value are stored in association with each other is provided for each carrier, and the above processing is performed for each carrier. The gain value of each carrier can be output using a table.

  According to the first to third transmitters, if the second method (“feedforward control by table”) is realized as a method for determining the level control information or gain value in the monitoring unit, level control is performed using a table. By outputting the information or gain value, the configuration for calculating the level control information or gain value becomes unnecessary, so the configuration of the monitoring unit can be simplified, and the time required for outputting the level control information or gain value is reduced. Therefore, it is possible to reduce a shift in output timing between the multicarrier signal or each carrier and the corresponding level control information or gain value.

  Next, as a method for determining the level control information or gain value in the monitoring units of the first to third transmitters, a fourth embodiment will be described with respect to a configuration for realizing the third method (“feedback control by table”). This will be described as an example.

  A transmitter according to a fourth embodiment of the present invention is a transmitter that adjusts a transmission signal level of a multicarrier signal synthesized by band-limiting and orthogonal modulation of a plurality of carriers, and after band limitation and orthogonal modulation. For each carrier, a multiplier that multiplies the input level control amount to output a level-adjusted carrier, an assumed value of the average input level of the carrier, and a carrier that is obtained based on the assumed value of the average input level Is stored in correspondence with the ideal value of the average output level of the carrier, and the ideal value of the average output level corresponding to the average input level of each carrier is read from the table and output from the multiplier. The level control amount of each carrier is adjusted so that the average output level of the corresponding carrier is equal to the ideal value of the average output level and output to the multiplier. The level control is performed so that the average output level corresponding to the average input level becomes the ideal value for each carrier, and the level fluctuation after band limitation is averaged for each carrier. By suppressing the average, fluctuations in the level of the multicarrier signal can be suppressed on average.

  In the transmitter, the monitoring unit is a monitoring unit that outputs a specific level control amount among the level control amounts corresponding to each carrier as a multi-carrier level control amount, and the multi-carrier level control amount is a multi-level control amount. Since the transmitter is equipped with a level adjustment unit that performs level adjustment by multiplying the carrier signal, level fluctuation after carrier band limitation is averaged for each carrier, and level fluctuation of the multicarrier signal is averaged. Can be suppressed.

  A transmitter according to a fourth embodiment of the present invention (hereinafter referred to as a fourth transmitter) will be described focusing on differences from the first to third transmitters. FIG. 15 is a configuration block diagram of the fourth transmitter, and FIG. 16 is a flowchart of the calculation process of the gain value of each carrier in the monitoring unit 41 of the fourth transmitter. The same components as those of the first to third transmitters will be described with the same reference numerals.

  In the fourth transmitter, the output power calculation units 17-1 to 17-n calculate the average output power of the carrier after multiplication with the gain values in the multipliers 31-1 to 31-n, and the monitoring unit 41 Output. The monitoring unit 41 calculates a gain value for each carrier and outputs the gain value to the multipliers 31-1 to 31-n. Further, the fourth transmitter is not provided with a signal level adjustment unit, and the multicarrier signal generated by the adder 14 is output to the D / A converter 2 as it is.

Next, a method for determining a gain value for each carrier in the monitoring unit 41 will be described with reference to FIG. Note that FIG. 16 shows processing for determining the gain value for carrier n, but the monitoring unit 41 performs the same processing for other carriers to calculate the gain value.
In performing the determination method, the monitoring unit 41 is preset with a table in which an assumed value of average input power and an ideal value of average output power are stored in association with each other for each carrier. The ideal value of the average output power stores an optimum value of the average output power obtained by the measurement when the average input power is an assumed value.

First, as a precondition, the monitoring unit 41 outputs an initial value (for example, 1) of a preset gain value of each carrier to the corresponding multipliers 31-1 to 31-n.
As the gain value calculation process, the monitoring unit 41 first monitors the average input power A (t (t) output from the input power calculation unit 16-n among the input power calculation units 16-1 to 16-n by monitoring the operation state. ) Is acquired (S71). Next, the monitoring unit 41 identifies an assumed value corresponding to the average input power A (t) among the assumed values of average input power stored in the table (S72). In the process S72, the monitoring unit 41 specifically identifies an assumed value by selecting an assumed value that most closely approximates the average input power A (t) from the assumed values stored in the table.
Then, the monitoring unit 41 reads out the ideal output power B ′ (t), which is an ideal value of the average output power corresponding to the specified assumed value, from the table (S73).

Furthermore, the monitoring unit 41 acquires the average output power B (t) of the carrier n output from the output power calculation unit 17-n (S74), and the ideal output power B ′ (t) read out in the process S73. A comparison is made to see if they match (S75).
In the process S75, if the average output power B (t) does not coincide with the ideal output power B ′ (t) (No in S75), the monitoring unit 41 determines the previous gain value GAIN _n (t−1). By adding or subtracting the correction coefficient γ, a new gain value GAIN _n (t) is calculated and output to the corresponding multiplier 31-n (S76). Through the process S76, a new gain value GAIN _n (t) is output to the multiplier 31-n, and multiplication with the carrier n is performed.

In the process S76, the correction coefficient γ (γ> 0) is a parameter set in the monitoring unit 41 in advance, and changes its value depending on the average input power or average output power of the carrier. Whether or not the correction coefficient γ is added or subtracted in the process S76 is determined by the magnitude of the average output power B (t) and the ideal output power B ′ (t). For example, if the average output power B (t) is smaller than the ideal output power B ′ (t), addition is performed, and if it is larger, subtraction is performed.
In the monitoring unit 41, a table in which the ideal output power B ′ (t), the average output power B (t), and the correction coefficient γ are associated with each other is set, and the ideal output power B ′ (t) and the average output power are set. A correction coefficient γ to be used is determined from the relationship of the power B (t), and a new gain value GAIN _n (t) is calculated.

  Further, after executing the process S76, the monitoring unit 41 returns to the process S74, acquires the average output power of the carrier n again, and compares it with the ideal output power B ′ (t) in the process S75. In step S75, the monitoring unit 41 performs this series of operations until the average output power B (t) matches the ideal output power B ′ (t) (Yes in S75). The above is the gain value determination process in the monitoring unit 41.

  In the fourth transmitter described above, the monitoring unit 41 obtains an ideal value of the average output power of each carrier using a table, and controls the gain value so that the actual average output power becomes the ideal value. However, as in the case of the monitoring unit 32 of the third transmitter, the expected level control amount is calculated from the average input power of each carrier, or the level control amount is read from the table and output to the multiplier 31. The multiplier 31 may compare the average output power after the level control amount multiplication with the average input power, correct the gain value so as to be the same, and output the corrected value.

  When the first to third transmitters are realized by the first method of determining the level control amount for adjusting the signal level of the carrier or multicarrier signal, the average input power of each carrier before the peak limit, Calculate and output multicarrier signal or gain value for each carrier based on average output power of carrier after peak limitation and band limitation, for multicarrier signal or carrier with insufficient peak limitation or excessive peak limitation Multi-carrier or each carrier level adjustment is performed by feedforward control that multiplies the gain value and returns to the reference level.

  On the other hand, in the fourth transmitter, the monitoring unit 41 first outputs the initial value of the gain value for each carrier in advance to the corresponding multipliers 31-1 to 31-n, and then each of the values before peak restriction. Reads the corresponding ideal average output power based on the average input power of the carrier and compares it with the average output power of the carrier after peak limit, band limit and gain value multiplication. The operation of calculating the value and outputting it to the multipliers 31-1 to 31-n is repeated.

That is, the fourth transmitter compares the average output power of the carrier after level adjustment with the ideal value, corrects the gain value until the average output power becomes equal to the ideal value, and multipliers 31-1 to 31-. The level of each carrier is adjusted by feedback control output to n.
By adopting such a configuration, the monitoring unit 41 can be performed more quickly without using a complicated arithmetic circuit than the feedforward control (first method) that performs the process of calculating the gain value of the multicarrier signal or each carrier. An optimum gain value can be specified.

  In the fourth transmitter, similarly to the first to third transmitters, a level signal adjustment unit for adjusting the level of the multicarrier signal may be provided after the adder 14. FIG. 17 is a configuration block diagram of a modified example of the fourth transmitter, in which a level signal adjustment unit 15 for adjusting the level of the multicarrier signal is provided at the subsequent stage of the adder 14. In this case, similarly to the monitoring unit 32 of the third transmitter, for example, the monitoring unit 41 determines the maximum gain value as level control information after determining the gain value of each carrier, and outputs it to the level signal adjustment unit 15 To do. In this process, the monitoring unit 41 may set a different condition (for example, the second largest gain value) as the condition of the gain value used as the level control information, but may use the maximum gain value. desirable.

  Moreover, since the 4th transmitter is performing level adjustment by feedback control, it takes time until the average output power of each carrier becomes an ideal value. Therefore, as another method of determining the level control information in the level signal adjusting unit 15, the monitoring unit 41 performs the same process as the monitoring unit 18 of the first transmitter until the average output power of each carrier reaches an ideal value. For the carrier that takes the maximum value of average input power, level control information is calculated from the average input power and average output power, and is output to the level signal adjustment unit to be multiplied by the multicarrier signal. The deviation from the ideal value of the average output power of each carrier that cannot be resolved can be eliminated.

In the third and fourth transmitters described above, based on the average input power in each carrier and the average output power after a series of signal processing for each carrier such as peak suppression, band limitation, and orthogonal modulation, Since the level adjustment according to the current operation state of the apparatus is performed on each carrier using the threshold value, the upper limit, and the lower limit value determined by the power value and the number of operating carriers, the first problem described in the problem can be solved.
Further, if the level adjustment is performed also on the multi-carrier signal, the level adjustment corresponding to the current operation state of the apparatus is also applied to the multi-carrier signal, and all problems can be solved.

  As described above, according to the transmitter of the embodiment belonging to the first type of the present invention, the monitoring unit specifies the carrier having the maximum average input power of each carrier, acquires the maximum value, and further specifies The average output power of the acquired carrier is obtained, the ratio between the obtained average input power and the average output power is obtained, level control information that is a ratio between the ratio and a preset expected value is calculated, and signal level adjustment is performed. By adjusting the level of the multicarrier signal by multiplying the multicarrier signal and the level control information in the unit, it is possible to suppress the fluctuation of the level of the multicarrier signal on the average corresponding to the fluctuation of the input level of the carrier effective.

  In addition, a multiplier for multiplying the carrier after band control and the gain value is provided for each carrier, and the monitoring unit obtains a ratio between the average input power and the average output power for each carrier, and the ratio and a preset expected value By calculating the gain value of each carrier based on the ratio to and outputting it to the corresponding multiplier, fluctuations in the level of the carrier after band limitation can be suppressed for each carrier, and fluctuations in the level of the multicarrier signal There is an effect that can be suppressed on average.

  Further, in the transmitter belonging to the first type of the present invention, the level adjustment of each carrier or multicarrier is performed using the gain value calculated based on the average input power for each specific carrier or each carrier and the average output power after band limitation. Therefore, it is possible to adjust the peak generated due to the band limitation of each carrier, and when setting the peak factor threshold in the peak power suppression unit 11, a lower threshold considering the peak generated due to the band limitation is set. There is no need to set the level, and the level can be adjusted according to the actually occurring peak.

  The transmitter configurations described so far (FIGS. 1, 2, 3, 15, and 17) are all the configurations of the transmitter 1 used in the transmission amplifier shown in FIG. Among the I and Q components after quadrature modulation of each carrier output from the units 13-1 to 13-n, the I component is combined by the adder 14 to output a multicarrier signal, and the signal level adjusting unit 15 The level adjustment is performed on the multicarrier signal obtained by synthesizing the I component. Hereinafter, this type of transmitter 1 is referred to as a digital quadrature modulation version transmitter.

  On the other hand, in order to obtain the configuration of the transmitter 1 ′ used in the transmission amplifier shown in FIG. 18, the peak voltage suppression unit 21 (FIG. 2) or multiplication located in the subsequent stage of the digital quadrature modulation unit 13 is used in each transmitter. The device 31 inputs the I and Q components after quadrature modulation of each carrier output from the digital quadrature modulation units 13-1 to 13-n, and performs peak voltage suppression or gain multiplication.

Then, two adders 14-1 and 14-2 are provided in the subsequent stage of the digital quadrature modulation unit 13, the peak voltage suppression unit 21, or the multiplier 31, and the I and Q components of each carrier are added, respectively, Are output as I and Q components.
And in the structure which has the signal level adjustment part 15, the level adjustment with respect to each component of I and Q of a multicarrier signal shall be performed. Hereinafter, this type of transmitter 1 'is referred to as an analog quadrature modulation version transmitter.
Accordingly, the analog quadrature modulation version transmitter 1 ′ used in the transmission amplifier shown in FIG. 18 performs the same operation as the digital quadrature modulation version transmitter 1 and obtains the same effect.

Next, a transmitter belonging to the second type of the present invention will be described.
A transmitter belonging to the second type of the present invention is a transmitter that transmits a multicarrier signal in which a plurality of carriers are combined by peak power suppression, band limitation, and quadrature modulation. And a transmitter that adjusts the signal level of the multicarrier signal based on the average output power of the multicarrier signal in some cases.

  Then, the transmitter that belongs to the second type of the present invention will be described in terms of function realization means. An input power calculation unit that calculates the average input power of the sum of all carriers, and a multicarrier signal that is synthesized by band-limiting each carrier. An output power calculation unit that calculates an average output power that is an average power, obtains a ratio between the acquired average input power and average output power, and outputs level control information that is a ratio between the ratio and a preset expected value A monitoring unit and signal level adjusting means for adjusting the level of the multi-carrier signal by multiplying the level control information output from the monitoring unit are provided, thereby responding to fluctuations in the input level of the carrier. Variations in the level of the multicarrier signal can be suppressed on average.

  Further, as a method of determining the level control information of the multicarrier in the monitoring unit, a method of determining using a table in which an estimated value of average input power of the carrier sum and a level control amount are associated, or a carrier sum Of adjusting the level control amount so that the average output power is equal to the ideal value using a table in which the estimated value of the average input power of the multi-carrier signal and the ideal value of the average output power of the multicarrier signal are associated with each other Therefore, it is possible to suppress, on average, fluctuations in the level of the multicarrier signal corresponding to fluctuations in the input level of the carrier by simple control.

  A specific configuration example of the transmitter belonging to the second type of the present invention will be described in the fifth and sixth embodiments.

Next, a transmitter (hereinafter referred to as a fifth transmitter) according to a fifth embodiment of the present invention will be described focusing on differences from the first transmitter.
First, the configuration of the fifth transmitter will be described with reference to FIG. FIG. 19 is a configuration block diagram of a transmitter according to the fifth embodiment. The same components as those of the first transmitter will be described with the same reference numerals.

  The fifth transmitter includes the same components as the first transmitter, such as carrier code multiplexed signal generation units 10-1 to 10-n, a peak power suppression unit 11, and waveform shaping filters 12-1 to 12-. n, digital quadrature modulation units 13-1 to 13-n, adders 14-1, 14-2, signal level adjustment unit 15, input power calculation unit 16 ', output power calculation unit 17, and monitoring Part 18.

In the fifth transmitter, the input power calculation target in the input power calculation unit 16 ′, the output power calculation target in the output power calculation unit 17, and the level control information calculation method in the monitoring unit 18 are the first transmitter. Is slightly different.
Further, in the fifth transmitter, the peak power suppression unit 11, the waveform shaping filters 12-1 to 12-n, the digital orthogonal modulation units 13-1 to 13-n, and the adders 14-1 and 14-2. The part consisting of the above will be referred to as a digital signal processing unit 70.

Next, the configuration of each unit of the fifth transmitter will be described. Since the carrier code multiplexed signal generation unit 10 to the signal level adjustment unit 15 are the same as those of the first transmitter, description thereof is omitted here. . The adders 14-1 and 14-2 are provided for the I component and the Q component, respectively.
The input power calculation unit 16 ′ in the fifth transmitter inputs all the carriers after spread modulation output from the carrier code multiplexed signal generation units 10-1 to 10-n, and based on the power value of each carrier The average input power of the sum of all carriers is calculated and output to the monitoring unit 18.

Here, the calculation method of the average input power in the input power calculation unit 16 ′ will be described focusing on the difference from the input power calculation unit 16 of the first transmitter.
In the first transmitter, the input power calculation unit 16 is provided for each carrier and calculates the power value for the input signal of one carrier, whereas the input power calculation unit 16 ′ of the fifth transmitter. Then, the power value is calculated by taking the sum of the input signals of all carriers.

  Therefore, if the input signal of each carrier is expressed by equation (1), the total power Pow of the input signals of all carriers can be expressed by the following equation (8).

  Next, the input power calculation unit 16 ′ uses the calculated total power value Pow to perform the weighting calculation process shown in the expression (6) and the expression (7) as in the description of the first transmitter. Perform the indicated averaging process.

  The output power calculation unit 17 receives the multicarrier signal added to each of the I and Q components, calculates the average output power of the multicarrier signal, and outputs the average output power to the monitoring unit 18. The calculation method of the average output power in the output power calculation unit 17 is the same as that of the first transmitter except that the input signal is a multicarrier signal.

The monitoring unit 18 calculates a parameter related to the level adjustment of the multicarrier signal based on the average input power output from the input power calculation unit 16 ′ and the average output power output from the output power calculation unit 17. This is output to the signal level adjustment unit 15 as control information.
The monitoring unit 18 described here realizes “feedforward control by calculation” which is a first method for determining a level control amount for adjusting the signal level of the multicarrier signal.

  Here, a method of calculating the level control information of the monitoring unit 18 in the fifth transmitter will be described with reference to FIG. FIG. 22 is a flowchart of level control information setting processing in the monitoring unit 18 of the fifth transmitter of the present invention.

  In FIG. 22, the monitoring unit 18 first determines the multi-carrier based on the total average input power of the carriers output from the input power calculation unit 16 ′ and the average output power of the multi-carrier signal output from the output power calculation unit 17. Signal level control information (gain value) is calculated (S110), and the calculated level control information is output to the signal level adjustment unit 15 (S111).

A detailed processing flow of the level control information calculation process (S110) in the monitoring unit 18 of the fifth transmitter is shown in FIG. 9 and FIG. The gain value) calculation processing flow is almost the same as that described above, and a detailed description thereof is omitted.
In FIG. 9 and FIG. 10, there is a process (S12) for selecting the maximum carrier from the average input power of a plurality of carriers, and the calculation is performed from the average input power and average output power of the selected carrier.
On the other hand, in the monitoring unit 18 of the fifth transmitter, the total average input power of the carriers is input as the average input power, the average output power of the multicarrier signal is input as the average output power, and the average input power and the average output are input. Since the level control information of the multicarrier signal is calculated from the power, the only difference is that (S12) becomes unnecessary.

Then, the threshold value for comparison with respect to the average output power B (t) in the process and the upper limit value and the lower limit value of GAIN (t) are values for the multicarrier determined by the power value of the carrier and the number of carriers in operation. It is.
In addition, the coefficient α (α> 0) used for the arithmetic processing here is a value determined by the total power value of a plurality of carrier signals, and is set in the monitoring unit 18 in advance. In determining the coefficient α, the monitoring unit 18 obtains the input / output power ratio of the reference data of the total power of the plurality of carrier signals and the power value of the multicarrier signal, and this reciprocal is α.

Next, the operation of the fifth transmitter will be described focusing on the difference from the first transmitter.
The operation of the main system of the fifth transmitter is the same as that of the first transmitter, and the transmission data of each carrier, which is digital data, is input to the corresponding carrier code multiplexed signal generators 10-1 to 10-n, Each carrier is spread-modulated and synthesized by a unique spreading code, and each carrier outputs an in-phase component (I component) and a quadrature component (Q component). Further, the peak power suppression unit 11 sets the total power of the carrier for each carrier. Based on this, the peak value is uniformly limited, the band is limited by the waveform shaping filters 12-1 to 12-n, the quadrature modulation is performed by the digital quadrature modulation units 13-1 to 13-n, and the adders 14-1 and 14-1 At 14-2, the I and Q components are combined and output as a multicarrier signal.

As a characteristic operation of the fifth transmitter, the I and Q components of each carrier output from the carrier code multiplexed signal generation units 10-1 to 10-n are input to the input power calculation unit 16 ′, and the input power calculation Based on the power value of each carrier at unit 16 ′, the average input power of the sum of all carriers is calculated and output to monitoring unit 18.
The I and Q components of the multicarrier signal synthesized by the adders 14-1 and 14-2 are input to the output power calculation unit 17, and the output power calculation unit 17 calculates the average output power of the multicarrier signal. And output to the monitoring unit 18.

  The monitoring unit 18 calculates and outputs the level control information of the multicarrier signal based on the average input power from the input power calculation unit 16 ′ and the average output power output from the output power calculation unit 17, and outputs the signal level. The adjustment unit 15 performs level adjustment on the multicarrier signal.

In the fifth transmitter, since the signal level adjustment unit 15 performs level adjustment according to the level of the multicarrier signal, the signal is output from the main line system (peak power suppression unit 11 to adder 14) of the fifth transmitter. The level control information corresponding to the multicarrier signal output from the multicarrier signal and the control system (input power calculation unit 16 ′, output power calculation unit 17 and monitoring unit 18) is the signal level adjustment unit at the same timing. 15 is preferably input.
For this reason, a delay device or the like may be provided in the main line system or the control system to synchronize the data output of the main line system and the control system.

  According to the fifth transmitter, based on the total average input power of each carrier and the average output power of the multicarrier signal, the monitoring unit 18 sets the control amount for level adjustment of the multicarrier signal after combining the carriers. Since the signal level adjustment unit 15 calculates and adjusts the level of the multi-carrier signal using the control amount, the multi-carrier corresponds to the fluctuation of the total power generated by the fluctuation of the input level of each carrier. The fluctuation of the signal level can be suppressed on average.

  The normal peak power suppression unit 11 performs peak control of each carrier in accordance with the total power of the carrier, but a peak or the like often occurs due to subsequent band limitation or the like. In the fifth transmitter, Since the level adjustment is performed by calculating the control amount of the level adjustment of the multicarrier signal based on the average input power and the average output power of the multicarrier signal in which each carrier is actually band-limited, the band limitation In addition, it is possible to suppress the fluctuation of the level of the multicarrier signal on average while stably suppressing the peak of the signal finally input to the amplifier including the peak generated by the above.

  In the above description, as the method for determining the level control information in the monitoring unit 18 of the fifth transmitter, the first method (“feedforward control by calculation”) has been described, but as with the first transmitter, It is realized by a second method (“feed-forward control by table”) that outputs level control information using a table that is composed of a set of an assumed value of average input power and level control information in advance. Also good.

In this case, the monitoring unit 18 includes an assumed value of average input power (total average input power of each carrier in the fifth transmitter) and a control target signal (multicarrier signal in the fifth transmitter). A table in which the level control information GAIN (t) is stored in association with each other is set in advance.
Here, the level control information GAIN (t) stores an optimum value of the level control information obtained by measurement when the total average input power of each carrier is an assumed value.

In the monitoring unit 18, the processing operation in the case of realizing the second method ("feedforward control by table") is the same as the processing operation of the monitoring unit 18 of the first transmitter described with reference to FIG. Since it is substantially the same, detailed description is abbreviate | omitted here.
The difference from the processing operation of the monitoring unit 18 of the first transmitter is that in FIG. 11, in S31, the maximum input power among the average input powers of the respective carriers input from the plurality of input power calculation units 16-1 to 16-n. Although the value has been acquired, the monitoring unit 18 of the fifth transmitter is different only in that the total average input power of the carriers input from the input power calculation unit 16 ′ may be acquired as it is.

Next, a configuration for realizing the third method (“feedback control by table”) as a method for determining the level control information in the monitoring unit of the fifth transmitter will be described as a sixth embodiment.
A transmitter according to a sixth embodiment of the present invention (hereinafter referred to as a sixth transmitter) will be described focusing on differences from the fifth transmitter. FIG. 20 is a configuration block diagram of a transmitter according to the sixth embodiment of the present invention. The same components as those of the fifth transmitter will be described with the same reference numerals.
The configuration of the sixth transmitter of the present invention is almost the same as that of the fifth transmitter shown in FIG. 19. A suppression unit 11, waveform shaping filters 12-1 to 12-n, digital quadrature modulation units 13-1 to 13-n, adders 14-1 and 14-2), a signal level adjustment unit 15, and an input The power calculation unit 16 ′, the output power calculation unit 17, and the monitoring unit 41 are configured.

  Note that, in the sixth transmitter, the output power calculation target in the output power calculation unit 17 is different from that of the fifth transmitter, and the control method of the level control information in the monitoring unit 41 is the monitoring unit of the fifth transmitter. 18 is different.

  The output power calculation unit 17 of the sixth transmitter calculates the average output power of the input signal. The multicarrier signal (I, Q) after multiplication with the level control information in the signal level adjustment unit 15 is calculated. Both components) are input, and the average output power of the multicarrier signal multiplied by the level control information is calculated and output.

When the monitoring unit 41 of the sixth transmitter realizes the third method (“feedback control by table”) as the method of determining the level control information for the multicarrier, the average input power (in the sixth transmitter, A table in which an assumed value of the total average input power of each carrier) and an ideal value of the average output power of the control target signal (multicarrier signal in the sixth transmitter) are stored in association with each other is set in advance. Has been.
Here, the ideal value of the average output power stores an optimum value of the average output power obtained by measurement when the average input power is an assumed value.

  Next, the outline of the level control information determination process for multicarriers in the monitoring unit 41 of the sixth transmitter is as follows. The average output power ideal corresponding to the total average input power of the carriers output from the input power calculation unit 16 ' The value (ideal output power) is read from the table, and the level control information is adjusted again so that the average output power of the multicarrier after multiplication of the level control information from the output power calculation unit 17 becomes equal to the ideal output power. 15 is a process to be output to 15.

  Note that the specific processing flow of the determination process of the monitoring unit 41 level control information of the sixth transmitter is the control flow of the monitoring unit 41 in the fourth transmitter belonging to the first type described with reference to FIG. Since it is the same as that, description is abbreviate | omitted here. FIG. 16 shows the process of acquiring the average input power of a specific carrier and controlling the gain value for the carrier. In the sixth transmitter, the total average input power is acquired and the level control for the multicarrier is performed. The difference is in controlling the information.

  The configurations of the fifth and sixth transmitters (FIGS. 19 and 20) described so far are the configurations of the digital quadrature modulation version transmitter 1 used in the transmission amplifier shown in FIG. Only the I component of the output from the signal processing unit 70 is input to the signal level adjustment unit 15 (FIG. 19), or only the I component of the output from the signal level adjustment unit 15 is used as a transmitter output (FIG. 20). )

On the other hand, in order to obtain the configuration of the analog quadrature modulation version transmitter 1 ′ used in the transmission amplifier shown in FIG. 18, in each transmitter, both I and Q components of the output from the digital signal processing unit 70 are signaled. The level adjustment unit 15 inputs the level adjustment (FIG. 19), or both the I and Q components of the output from the signal level adjustment unit 15 may be used as the transmitter output.
As a result, the transmitter 1 ′ used in the transmission amplifier shown in FIG. 18 performs the same operation as the transmitter 1, and the same effect can be obtained.

  In the fifth and sixth transmitters shown in FIGS. 19 and 20, the inside of the digital signal processing unit 70 is a transmitter belonging to the conventional type and the first type shown in FIG. 7 (first to fourth transmissions). In the same manner as in the above, the peak power suppression unit 11, waveform shaping filters 12-1 to 12-n, digital quadrature modulation units 13-1 to 13-n, and adders 14-1 and 14-2 are configured. However, the digital signal processing unit 70 may have a different configuration.

  As another configuration example inside the digital signal processing unit 70 in the fifth and sixth transmitters, as shown in FIG. 21, the first to fourth peak power suppression units 11-1 to 11-4, It comprises waveform shaping filters 12-1 to 12-n, digital quadrature modulation units 13-1 to 13-n, and adders 14-1 and 14-2. FIG. 21 is a block diagram showing another internal configuration example of the digital signal processing unit 70 in the sixth transmitter of the present invention.

The first to third peak power suppression units 11-1 to 11-3 are configured so that each configuration is applied to each carrier based on the level of the input carrier or based on the level when the carriers are combined. The power is uniformly limited and each carrier signal after the limitation is output.
The fourth peak power suppression unit 11-4 limits the power of the multicarrier signal based on the input multicarrier level, and outputs the limited multicarrier signal.
The details of the operation of each peak power suppression unit 11 are the same as described in the first transmitter, and thus the description thereof is omitted here.

In addition, the 1st-4th peak power suppression part can implement | achieve reduction of peak power more ideally by enforcing a peak reduction operation several times inside a function.
In the configuration of FIG. 21, the first to fourth peak power suppression units are provided, but it is not necessary to install all of them, and it is necessary to arrange them in at least one place in consideration of target efficiency, circuit scale, and the like. .

  As described above, according to the transmitter belonging to the second type of the present invention, in the monitoring unit, based on the obtained average input power of the sum of all carriers (and possibly the average output power of the multicarrier signal). Since the level adjustment according to the current operation status of the apparatus is performed on the multicarrier signal using the threshold value, the upper limit, and the lower limit value determined by the actual carrier power value and the number of carriers in operation, Solves the third problem, averages fluctuations in the level of the multicarrier signal stably while suppressing the peak of the signal finally input to the amplifier, including the peak generated by band limitation etc. Can be suppressed.

Next, a transmitter belonging to the third type of the present invention will be described.
A transmitter belonging to the third type of the present invention is a transmitter that transmits a multicarrier signal in which a plurality of carriers are combined by peak power suppression, band limitation and orthogonal modulation, and for each carrier, peak power suppression of the carrier. The transmitter adjusts the signal level of the signal whose peak power is suppressed for the carrier based on the previous average input power and, in some cases, the average output power after the peak power of the carrier is suppressed.

  A transmitter that belongs to the third type of the present invention will be described in terms of function realizing means. A peak power suppression unit that performs uniform peak power suppression based on the sum of carriers for each carrier, and a carrier associated with each carrier. The configuration includes an input power calculation unit that calculates average input power that is average power before peak power suppression, an output power calculation unit that calculates average output power that is average power after peak power suppression, and a calculated average input A monitoring unit that obtains a ratio of power and average output power, outputs level control information that is a ratio between the ratio and a preset expected value, and a signal after peak power suppression of the level control information output from the monitoring unit And a peak power suppression / adjustment unit having a signal level adjustment unit that adjusts the level of the carrier signal, thereby providing a uniform peak based on the sum of carriers. By adjusting the level of each carrier after the force suppressing the variation in the level of the carrier signal can be suppressed on average in response to variation of the input level of the carrier.

  In the transmitter belonging to the third type of the present invention, in the transmitter that transmits a multicarrier signal in which a plurality of carriers are combined by band limitation and orthogonal modulation, the peak power suppression / adjustment unit is set before band limitation, Or it is placed between band limitation and quadrature modulation, between quadrature modulation and synthesis, and by this means to suppress fluctuation of carrier signal level on average in response to fluctuations in carrier input level. Can do.

  In addition, as a method of determining the carrier level control information in the monitoring unit, a method of determining using the table in which the estimated value of the average input power of the carrier and the level control amount are associated, or the average input power of the carrier Using a table in which the estimated value of the carrier and the ideal value of the average output power of the carrier are associated with each other, a method for adjusting and determining the level control amount so that the average output power becomes equal to the ideal value is realized. With this control, fluctuations in the carrier signal level can be suppressed on average in response to fluctuations in the carrier input level.

  A specific configuration example of a transmitter belonging to the third type of the present invention will be described in a seventh embodiment.

Next, regarding the configuration of the first configuration example of the transmitter (hereinafter referred to as the 7-1 transmitter) according to the seventh embodiment of the present invention, the difference from the first transmitter will be described with reference to FIG. The explanation will be centered. FIG. 23 is a configuration block diagram of a first transmitter (7-1th transmitter) according to the seventh embodiment of the present invention. The same components as those of the conventional transmitter or the first transmitter will be described with the same reference numerals.
FIG. 23 shows the configuration of the digital quadrature modulation version of the transmitter 1, but if the digital quadrature modulation units 13-1 to 13-n and the subsequent outputs are both I and Q component outputs, It becomes a transmitter 1 '.

  The 7-1 transmitter of the present invention has substantially the same configuration as the conventional transmitter shown in FIG. 7 or the first to fourth transmitters of the present invention. , Waveform shaping filters 12-1 to 12-n, digital quadrature modulation units 13-1 to 13-n, and an adder 14, and instead of the conventional peak voltage suppression unit 51, peak power suppression / adjustment A portion 60 is provided.

Next, the configuration of each part of the 7-1 transmitter will be described. Carrier code multiplexed signal generators 10-1 to 10-n having the same configuration as the conventional or the first to fourth transmitters of the present invention Description of the waveform shaping filters 12-1 to 12-n, the digital quadrature modulation units 13-1 to 13-n, and the adder 14 is omitted.
The adder 14 adds only the I component of the quadrature modulation signal output from the digital quadrature modulation units 13-1 to 13-n.

  The peak power suppression / adjustment unit 60, which is a characteristic part of the 7-1 transmitter, uniformly suppresses the peak power for each carrier based on the total sum of the input carriers, and further averages the input of each carrier. Level adjustment based on power, or level adjustment based on the average input power of each carrier and the average power after peak power restriction is performed, and each carrier after level adjustment is output.

A specific configuration example (first configuration example) of the peak power suppression / adjustment unit 60 of the 7-1 transmitter will be described with reference to FIG. FIG. 24 is a configuration block diagram showing a first configuration example inside the peak power suppression / adjustment unit 60 of the 7-1 transmitter of the present invention.
As a first configuration example inside the peak power suppression / adjustment unit 60 of the 7-1 transmitter of the present invention, as shown in FIG. 24, there are a plurality (n in the figure) of peak power suppression units. Peak power suppression unit 11, signal level adjustment units 15-1 to 15-n, input power calculation units 16-1 to 16-n, and output power calculation units 17-1 to 17-n provided in association with each carrier And the monitoring unit 18.

Next, each part in the peak power suppression / adjustment unit 60 will be described.
The peak power suppression unit 11 detects the peak based on the instantaneous power and the average power with respect to the total power of the carrier in order to suppress the maximum power of the multicarrier signal input to the power amplification unit in the transmission amplifier, and the peak is detected. In this case, the conventional peak power suppression unit outputs the power value of the carrier uniformly suppressed.

In FIG. 24, the first to n-th peak power suppression units are provided in multiple stages, and the peak power reduction is more ideally realized by performing the peak reduction operation a plurality of times. Considering the circuit scale and the like, it is necessary to arrange at least one.
Since the details of the operation of the peak power suppression unit 11 are the same as those of the first transmitter, description thereof is omitted here.

  The signal level adjusters 15-1 to 15-n perform level adjustment control on each carrier signal from the peak power suppressor 11 and output based on level control information output from the monitor 18 described later. is there.

  The input power calculation units 16-1 to 16-n are provided for each carrier, and input the carrier before being input to the peak power suppression unit 11, that is, the carrier before peak power suppression, to the power value of the input signal. Based on this, the average input power is calculated and output to the monitoring unit 18. In addition, since the calculation method of the average input power in the input power calculating units 16-1 to 16-n is the same as that of the first transmitter, description thereof is omitted here.

  The output power calculation units 17-1 to 17-n are provided for each carrier, and receive the peak-power-suppressed carrier output from the peak power suppression unit 11 as an input, and average based on the power value of the input signal. The output power is calculated and output to the monitoring unit 18. The calculation method of the average output power in the output power calculation units 17-1 to 17-n also differs from the first calculation in that the calculation method of the average output power for the calculation target signal is different only in the input calculation target signal. Since it is the same as the machine, the description is omitted here.

  The monitoring unit 18 inputs the average input power output from the input power calculation units 16-1 to 16-n and the average output power output from the output power calculation units 17-1 to 17-n, and receives each carrier. Based on the two types of average powers output from the two calculation units associated with each other, a parameter related to the level adjustment of each carrier signal is calculated, and the signal level adjustment unit 15 corresponding to the calculation target carrier is calculated as level control information. -1 to 15-n.

A method for calculating the level control information of each carrier in the monitoring unit 18 will be described with reference to FIG. FIG. 25 is a flowchart of level control information setting processing for each carrier in the monitoring unit 18 of the seventh transmitter of the present invention.
In FIG. 25, the monitoring unit 18 calculates a gain value for each carrier (S143-1 to S143-n) and outputs the gain value to the corresponding signal level adjustment units 15-1 to 15-n (S144).

  As an overview of the processes in the processes S143-1 to S143-n, the average input power output from the input power calculators 16-1 to 16-n corresponding to the carrier to be calculated and the output power calculators 17-1 to 17-1 Based on the average output power output from 17-n, the gain value of the carrier is calculated. Note that the specific processing method of gain value calculation is the same as the processing described in the third transmitter with reference to FIGS. 13 and 14, and thus description thereof is omitted here.

  The monitoring unit 18 periodically performs level control information (gain value) calculation processing for each carrier at a specified timing. Further, the monitoring unit 18 stores the gain value GAINn (t) for each carrier calculated at the past timing in a storage unit (not shown), and reads it from the storage unit when calculating a new gain value. .

The operation of the peak power suppression / adjustment unit 60 of the 7-1 transmitter will be described with reference to FIG. 24. The input signal of each carrier is uniformly transmitted by the peak power suppression unit 11 based on the sum of the carriers. Is output with a peak power limit.
In parallel with this, each carrier before input to the peak power suppression unit 11 is input to the input power calculation units 16-1 to 16-n to obtain an average input power, and each carrier from the peak power suppression unit 11 is obtained. Are input to the output power calculation units 17-1 to 17-n to obtain the average output power, and the monitoring unit 18 calculates the level control information (gain value) from the average input power and the average output power for each carrier. It is output to the signal level adjusters 15-1 to 15-n corresponding to the target carrier.
Then, in the signal level adjustment units 15-1 to 15-n, each carrier output from the peak power suppression unit 11 that is uniformly peak power suppressed is multiplied by each gain value output from the monitoring unit 18, and the carrier A level-adjusted signal is output every time.

  The operation of the seventh transmitter of the present invention will be described with reference to FIG. 23. The transmission data of each carrier, which is digital data, is input to the corresponding carrier code multiplex signal generators 10-1 to 10-n and is unique. The I and Q components are output after being spread-modulated by the spreading code of, and the peak power suppression / adjustment unit 60 performs peak power suppression uniformly on each carrier based on the sum of the carriers, Further, level adjustment based on the average input power of each carrier or level adjustment based on the average input power of each carrier and the average power after peak power limitation is performed, and each carrier after level adjustment is output.

  Each carrier signal after peak suppression and level adjustment is band-limited by the corresponding waveform shaping filters 12-1 to 12-n, further orthogonally modulated by the digital orthogonal modulation units 13-1 to 13-n, and added. The I components of the carriers orthogonally modulated by the unit 14 are combined and output as a multicarrier signal.

  According to the seventh transmitter, the average output power from the output power calculation unit 17 is at a level with respect to the average input power from the input power calculation unit 16 in the section where the peak suppression is operated by the peak power suppression unit 11. Although it is expected to be suppressed, based on the average input power and the average output power after peak suppression, the threshold value, upper limit, and lower limit value determined by the actual carrier power value and the number of operating carriers are used. Since each carrier is level-adjusted in accordance with the current operation status of the device, each carrier signal corresponding to an arbitrary section (frame, etc.) can be approximated to the level when using the reference data. Thus, even if the input carrier level fluctuates, the fluctuation in the level of each carrier signal can be stably suppressed on average, and finally the It is possible to suppress variation in the level of the carrier signal.

  In the above description, the first method (“feedforward control by calculation”) has been described as the method for determining the level control information in the monitoring unit 18 of the seventh transmitter, but with the first to sixth transmitters, Similarly, this is realized by a second method (“feed-forward control using a table”) that outputs level control information using a table in which an assumed value of average input power and level control information are configured in advance. You may do it.

In this case, the monitoring unit 18 includes an assumed value of average input power (average input power of each carrier in the seventh transmitter) and a control target signal (carrier after peak suppression in the seventh transmitter). Signal) level control information GAIN (t) is stored in advance in association with the table.
Here, the level control information GAIN (t) stores an optimum value of the level control information obtained by measurement when the average input power of each carrier is an assumed value.

  Then, the processing operation when the monitoring unit 18 realizes the second method ("feedforward control by table") will be described with reference to FIG. FIG. 26 is a flowchart of level control information output processing using a table in the monitoring unit 18 of the seventh transmitter. FIG. 26 shows the processing when level control information for carrier n is determined, but the monitoring unit 18 performs the same processing for other carriers to determine level control information.

The monitoring unit monitors the operation status of the input power calculation unit 16-n, and acquires the average input power An (t) from the input power calculation unit 16-n (S171). Next, the monitoring unit identifies an assumed value corresponding to the average input power An (t) among the assumed values of average input power stored in the table (S172). In the process S172, the monitoring unit specifically identifies the assumed value by selecting an assumed value that is closest to the average input power An (t) from the assumed values stored in the table.
Then, the monitoring unit reads level control information (gain) GAINn (t) corresponding to the specified assumed value (S173), and outputs it to the signal level adjustment unit 15-n as level control information (S174). The above is the output process of the level control information using the table.

  According to the seventh transmitter, when the peak power suppression / adjustment unit 60 performs peak power suppression uniformly on each carrier based on the sum of the carriers input by the conventional peak power suppression unit 11. In addition, the monitoring unit 18 obtains level control information related to level adjustment based on the input power of each carrier or level adjustment based on the input power of each carrier and the power after peak power suppression for each carrier, and after peak power suppression Since level adjustment is performed, the adverse effect of uniform peak power suppression based on the sum of carriers can be adjusted in accordance with the level of each carrier signal, and fluctuations in the output level of each carrier can be suppressed on average.

  Next, input / output characteristics of one carrier in the seventh transmitter and the conventional transmitter will be described with reference to FIGS. FIG. 27 is a graph showing a simulation example regarding an input setting level and an output level when transmitting a signal of one carrier in 32 code multiplexing in the seventh transmitter and the prior art transmitter, and FIG. It is the graph which showed the example of a simulation regarding a level and a level deviation. FIG. 29 is a graph showing a simulation example regarding the input setting level and the output level for the level-changing carrier (carrier 1) at the time of transmitting the two-carrier signal at the time of 32 code multiplexing, and FIG. 30 shows the input setting for the carrier 1. FIG. 31 is a graph showing a simulation example regarding the difference between the input setting level of carrier 1 and the input / output level difference of carrier 2 with respect to the fixed level carrier (carrier 2). is there.

As an explanation of FIG. 27 and FIG. 28, the input / output level difference represents the level difference between the input setting level and the output level of the transmitter. That is, when the input level is increased linearly, the expected value is a value obtained by linearly increasing the output level.
In the measurement of the characteristics shown in FIGS. 27 and 28, the peak voltage suppression unit 11 used in the seventh transmitter and the conventional transmitter performs carrier level limitation, and the threshold value is a fixed value (average power during 0 dBm transmission). + 6dB). As shown in FIG. 27, in the case of a conventional transmitter, when the input setting level is increased, the threshold value of the peak voltage suppressing unit 11 is exceeded and the amplitude is limited accordingly, so that the input setting level is increased. As a result, a level deviation occurs. In the seventh transmitter, the signal level adjustment unit 15 can keep the input / output characteristics linear by multiplying the carrier by the level control information. That is, the input / output level difference can be made constant.

In the measurement of characteristics shown in FIG. 29 to FIG. 31, among the two carriers, the carrier 2 has a fixed input level and the input level of the carrier 1 is varied. Moreover, the peak power suppression unit 11 is designed to operate based on the total power of the carrier. The threshold value is a fixed value (average power when both carriers transmit 0 dBm +6 dB).
As shown in FIG. 29 and FIG. 30, for carrier 1, when the input setting level is increased, the threshold of the peak power suppression unit is exceeded by that amount, and the amplitude is limited. As the input setting level increases, a level deviation occurs.
In addition, as shown in FIG. 31, for carrier 2, in the case of a conventional transmitter, if the input setting level of carrier 1 is increased, the operating frequency of peak power suppression unit 11 increases, and carrier 2 input at a constant level. Also, the output level is lowered without being constant. Therefore, the output level of the carrier 2 has a level deviation as the set level of the carrier 1 increases.
On the other hand, in the seventh transmitter, similarly to the transmission at the time of one carrier in FIG. 28, based on the level control information set by the monitoring unit 18, the signal level adjusting units 15-1 to 15-n receive the carrier signal. Level control is performed, and as a result, fluctuations in the output level of each carrier can be suppressed.

  Next, as a method for determining the level control information in the monitoring unit of the seventh transmitter, a specific configuration example of the peak power suppression / adjustment unit 60 in the case of realizing the third method (“feedback control by table”) ( A second configuration example will be described with reference to FIG. FIG. 32 is a configuration block diagram showing a second configuration example inside the peak power suppression / adjustment unit 60 of the 7-1 transmitter of the present invention. The same components as those in the first configuration example in FIG. 24 will be described with the same reference numerals.

  As a second configuration example inside the peak power suppression / adjustment unit 60 of the 7-1 transmitter of the present invention, as shown in FIG. 32, there are a plurality (n in the figure) peak power suppression units. Peak power suppression unit 11, signal level adjustment units 15-1 to 15-n, input power calculation units 16-1 to 16-n, and output power calculation units 17-1 to 17-n provided in association with each carrier And a monitoring unit 41.

  In the second configuration example, the output power calculation target in the output power calculation unit 17 is different from that in the first configuration example, and the control method of the level control information in the monitoring unit 41 is the monitoring unit 18 of the first configuration. Is different.

  The output power calculation units 17-1 to 17-n of the second configuration example calculate the average output power of the input signal, but the level control information in the signal level adjustment units 15-1 to 15-n. Each of the carrier signals after multiplication with is calculated, and the average output power of the carrier signal after multiplication of the level control information is calculated and output.

When the monitoring unit 41 of the second configuration example realizes the third method (“feedback control by a table”) as a method of determining the level control information for each carrier, the average input power (in the seventh transmitter, A table in which an assumed value of the average input power of each carrier) and an ideal value of the average output power of the control target signal (each carrier signal in the seventh transmitter) are stored in association with each other is set in advance. ing.
Here, the ideal value of the average output power stores an optimum value of the average output power obtained by measurement when the average input power is an assumed value.

  Next, the outline of the level control information determination process for each carrier in the monitoring unit 41 of the second configuration example is the average input power of the carriers output from the input power calculation units 16-1 to 16-n for each carrier. The level of the average output power of the multicarriers after the ideal value (ideal output power) of the corresponding average output power is read from the table and multiplied by the level control information from the corresponding output power calculation units 17-1 to 17-n is equal. This process is to adjust the control information again and output it to the corresponding signal level adjusters 15-1 to 15-n.

  The specific processing flow of the determination process of the monitoring unit 41 level control information of the second configuration example is the control flow of the monitoring unit 41 in the fourth transmitter belonging to the first type described with reference to FIG. Since it is the same as that, description is abbreviate | omitted here.

  In the seventh transmitter described with reference to FIG. 32, the monitoring unit 41 obtains an ideal value of the average output power of each carrier using a table, and the gain value so that the actual average output power becomes the ideal value. As in the case of the monitoring unit 32 of the third transmitter, the level control amount expected from the average input power of each carrier is calculated, or the level control amount is read from the table and the signal is output. The output may be output to the level adjustment unit 15, and the signal level adjustment unit 15 may compare the average output power after the level control amount multiplication and the average input power and correct the gain value so as to be the same.

  In the seventh transmitter, if the second configuration example is used for the peak power suppression / adjustment unit 60, the average output power of each carrier signal after level adjustment is compared with the ideal value, and the average output power is the ideal value. Since the level adjustment of each carrier is performed by feedback control that corrects the level control information until it becomes equal to and outputs it to the signal level adjustment units 15-1 to 15-n, the process of calculating the level control information of each carrier Compared with the feedforward control (first method) for performing the above, the monitoring unit 41 can quickly specify the optimum level control information without using a complicated arithmetic circuit.

  Up to now, as a specific configuration example of the transmitter belonging to the third type of the present invention, the peak power suppression / adjustment unit 60 is arranged in front of the waveform shaping filters 12-1 to 12-n as shown in FIG. Although the description has been made with the transmitter having the configuration (the 7-1 transmitter), the configuration may be such that the peak power suppression / adjustment unit 60 is arranged at another location.

As a specific example, as shown in FIG. 33, a transmitter in which a peak power suppression / adjustment unit 60 is provided between waveform shaping filters 12-1 to 12-n and digital quadrature modulation units 13-1 to 13-n. (Example 7-2 transmitter) As shown in FIG. 34, the peak power suppression / adjustment unit 60 is provided between the digital quadrature modulation units 13-1 to 13-n and the adder 14. An example of a transmitter (seventh transmitter) is considered.
FIG. 33 is a block diagram showing the configuration of the second transmitter (seventh transmitter-2) according to the seventh embodiment of the present invention, and FIG. 34 shows the configuration of the seventh transmitter according to the seventh embodiment of the present invention. 3 is a configuration block diagram of a third transmitter (seventh transmitter). FIG.

  In the transmitter 7-2, the peak power suppression / adjustment unit 60 is provided in the subsequent stage of the waveform shaping filters 12-1 to 12-n, and each carrier after band limitation in the waveform shaping filters 12-1 to 12-n is performed. The level is adjusted according to the average input power of each carrier while performing uniform peak power suppression based on the sum of each carrier. While suppressing the level of the protruding portion with respect to the carrier, the adverse effect of uniform peak power suppression based on the sum can be adjusted in accordance with the level of each carrier signal.

  In the transmitter 7-3, the peak power suppression / adjustment unit 60 is provided in the subsequent stage of the digital quadrature modulation units 13-1 to 13-n, and after the modulation in the digital quadrature modulation units 13-1 to 13-n. While performing uniform peak power suppression based on the sum of each carrier for each carrier, level adjustment is performed according to the average input power of each carrier, so that for each carrier such as band limitation and digital quadrature modulation Based on the increase in peak factor generated by the total signal processing performed, that is, level protrusion, etc., while applying uniform peak power suppression based on the sum of carriers and suppressing the level of the protruding part against the carrier, In addition, the adverse effect of uniform peak power suppression based on the sum can be adjusted in accordance with the level of each carrier signal.

In the transmitter according to the third type, since the signal level adjusters 15-1 to 15-n perform level adjustment according to the level of each carrier signal, the carrier output from the main line system (peak power suppressor 11). The signal and level control information corresponding to each carrier signal output from the control system (input power calculation unit 16, output power calculation unit 17, and monitoring units 18, 41) is the signal level adjustment unit 15 at the same timing. It is preferable to input to -1 to 15-n.
For this reason, a delay device or the like may be provided in the main line system or the control system to synchronize the data output of the main line system and the control system.

  According to the transmitter according to the third type, the control amount for level adjustment of each carrier is determined based on the average input power before peak suppression and the average output power after peak suppression in the peak power suppression unit 11 for each carrier. Since the level of each carrier signal after peak suppression is adjusted using the calculated control amount, the negative effect of uniform level suppression based on the total sum of carriers in the peak power suppression unit 11 is averaged for each carrier. Adjustment can be made according to the level, and fluctuations in the level of each carrier signal can be suppressed on average.

  As a specific event, the normal peak power suppression unit 11 performs peak control of each carrier according to the total power of the carriers, so that even if there is a carrier that varies greatly in the input level, the total power level of all carriers Is less than the specified value, peak control is not performed, but the monitoring units 18 and 41 calculate an appropriate gain value for the carrier with a large fluctuation, and the signal level adjustment unit 15 corresponding to the carrier level Thus, fluctuations are suppressed and fluctuations in levels in the multicarrier signal are finally reduced.

As another event, when the carrier A with a small input level fluctuation and the carrier B with a rapidly changing input level are mixed, the peak power suppression unit 11 performs peak control ( The frequency of (suppression) increases, and the carrier A is subject to a uniform peak restriction and the carrier level is lowered.
On the other hand, the monitoring units 18 and 41 calculate a gain value that returns the uniform peak suppression performed by the peak power suppression unit 11 from the average power ratio before and after the peak control (suppression) of the carrier A, The signal level adjustment unit 15 corresponding to the carrier A performs level control (in practice, an increase) to restore the level, and finally the level fluctuation in the multicarrier signal is suppressed.

  According to the transmitter of the third type, the actual carrier power based on the average input power in each carrier and the average output power after a series of signal processing for each carrier such as peak suppression, band limitation, and orthogonal modulation. Each carrier is level-adjusted according to the current operation status of the device using the threshold value, upper limit, and lower limit value determined by the value and the number of active carriers, so each carrier signal corresponding to an arbitrary section (frame etc.) is used as a reference The level of each carrier signal can be approximated to the level at the time of using data, and even if the first problem described in the problem is solved and the level of the input carrier fluctuates, Fluctuations can be suppressed on average, and finally, fluctuations in level in the multicarrier signal can be suppressed.

Next, a transmitter belonging to the fourth type of the present invention will be described.
In the fourth type, in a transmitter that transmits a multicarrier signal in which a plurality of carriers are band-limited and orthogonally modulated and combined to suppress peak power, the average input power before multicarrier peak power suppression (and, This is a transmitter that adjusts the signal level of the multicarrier peak power-suppressed signal based on the case (average output power after multicarrier peak power suppression).

  Then, a transmitter belonging to the fourth type of the present invention will be described in terms of function realization means. A peak power suppression unit that performs peak power suppression on multicarriers, and an average input power that is an average power before peak power suppression. The input power calculation unit to be calculated, the output power calculation unit to calculate the average output power that is the average power after peak power suppression, and the ratio of the calculated average input power to the average output power is obtained and the ratio is set in advance. Level control information that is a ratio to the expected value, and signal level adjustment that adjusts the level of the multicarrier signal by multiplying the signal after peak power suppression by the level control information output from the monitoring unit And a peak power suppression / adjustment unit having a multi-carrier signal input level by performing level adjustment after multi-carrier peak power suppression. The variation in level of the multicarrier signal after peak suppression can be suppressed on average in response to variations in level.

  A specific configuration example of a transmitter belonging to the fourth type of the present invention will be described in an eighth embodiment.

Next, a configuration of a configuration example of the transmitter according to the eighth example of the present invention will be described with reference to FIG. 35 focusing on differences from the seventh transmitter. FIG. 35 is a block diagram showing the configuration of the transmitter (eighth transmitter) according to the eighth embodiment of the present invention. Note that the same components as those of the seventh transmitter are described with the same reference numerals.
In FIG. 35, the configuration of the analog quadrature modulation version transmitter 1 'is shown. However, if the digital quadrature modulation units 13-1 to 13-n and later are output with only the I component, the digital quadrature modulation version of the transmitter 1' is shown. It becomes the transmitter 1.

  The eighth transmitter of the present invention includes carrier code multiplexed signal generators 10-1 to 10-n having the same configuration as the seventh transmitter of the present invention shown in FIG. 1 to 12-n, digital quadrature modulation units 13-1 to 13-n, and an adder 14, and a peak power suppression / adjustment unit 60 provided in the process of each carrier in the seventh transmitter. Instead, a peak power suppression / adjustment unit 60 ′ is provided for the multicarrier signal after the adder 14.

  The peak power suppression / adjustment unit 60 ′, which is a characteristic part of the eighth transmitter, performs peak power suppression based on the input multicarrier and performs level adjustment based on the average input power of the multicarrier, or multicarrier Level adjustment based on the average input power and the average power after peak power restriction is performed, and each carrier after level adjustment is output.

  A specific configuration example (first configuration example) of the peak power suppression / adjustment unit 60 ′ of the eighth transmitter will be described with reference to FIG. FIG. 36 is a configuration block diagram illustrating a first configuration example inside the peak power suppression / adjustment unit 60 ′ of the eighth transmitter. In FIG. 36, the configuration of the analog quadrature modulation version transmitter 1 'is shown. However, if the input / output is only the I component, the digital quadrature modulation version of the transmitter 1 is configured.

  As a first configuration example inside the peak power suppression / adjustment unit 60 ′ of the eighth transmitter of the present invention, as shown in FIG. 36, a peak having a plurality (n in the figure) of peak power suppression units is provided. The power suppression unit 11 ′, the signal level adjustment unit 15, the input power calculation unit 16, the output power calculation unit 17, and the monitoring unit 18 are configured.

Next, each part in the peak power suppression / adjustment unit 60 ′ will be described.
The peak power suppression unit 11 ′ detects a peak based on the instantaneous power and average power of the multicarrier signal in order to suppress the maximum power of the multicarrier signal input to the power amplification unit in the transmission amplifier, and the peak is detected. In this case, the power value of the multicarrier is suppressed and output.
In FIG. 36, the first to n-th peak power suppression units are provided in multiple stages, and the peak power reduction is more ideally realized by performing the peak reduction operation a plurality of times. Considering the circuit scale and the like, it is necessary to arrange at least one.

  The outline of the operation of the peak power suppression unit 11 'is almost the same as that of the first transmitter. In the first transmitter, the peak factor is obtained from the total power of a plurality of inputted carriers, and the operation is performed for each carrier. In contrast to the peak suppression, since the multi-carrier signal in which a plurality of carriers are already combined is input to the eighth transmitter, the peak factor is obtained from the power of the input multi-carrier signal, The difference is that peak suppression is performed.

  The signal level adjustment unit 15, the input power calculation unit 16, the output power calculation unit 17, and the monitoring unit 18 are the same as those in the peak power suppression / adjustment unit 60 of the seventh transmitter. In this transmitter, the signal input to each part is a carrier signal, whereas in the eighth transmitter, the signal input to each part is a multicarrier signal, but only a specific calculation is performed. Since the method and the control method are the same, the description is omitted here.

  In the above description, the level control information determination method in the monitoring unit 18 of the eighth transmitter has been described in the first method (“feedforward control by calculation”). However, the first to seventh transmitters Similarly, this is realized by a second method (“feed-forward control using a table”) that outputs level control information using a table in which an assumed value of average input power and level control information are configured in advance. You may do it.

In this case, the monitoring unit 18 includes an assumed value of average input power (average input power of multicarrier in the eighth transmitter) and a control target signal (multiple after peak suppression in the eighth transmitter). A table in which the level control information GAIN (t) of the carrier signal) is stored in association with each other is set in advance.
Here, the level control information GAIN (t) stores an optimum value of the level control information obtained by measurement when the average input power of the multicarrier is an assumed value.

  Then, in the monitoring unit 18, the processing operation when realizing the second method (“feedforward control by table”) is the same as that described in the monitoring unit 18 of the seventh transmitter with reference to FIG. 26. Therefore, the description is omitted here. FIG. 26 shows the processing for determining the level control information for the carrier n, but the monitoring unit 18 of the eighth transmitter controls the multicarrier signal.

  Since the operation of the first peak power suppression / adjustment unit 60 ′ of the eighth transmitter is the same as the operation of the peak power suppression / adjustment unit 60 of the 7-1 transmitter, detailed description thereof will be omitted. The peak power suppression unit 11 performs peak power restriction (suppression) based on the multicarrier, and the average input power before the peak power suppression of the multicarrier is obtained by the input power calculation unit 16. The output power is obtained by the output power calculation unit 17, and the level control information (gain value) is calculated from the average input power and the average output power by the monitoring unit 18, or level control corresponding to the average input power using a table The information is obtained, and the signal level adjustment unit 15 multiplies the multicarrier output from the peak power suppression unit 11 by the gain value to output a level-adjusted multicarrier signal. .

  Next, a specific configuration example of the peak power suppression / adjustment unit 60 ′ when the third method (“feedback control by table”) is realized as the level control information determination method in the monitoring unit of the eighth transmitter. (Second Configuration Example) will be described with reference to FIG. FIG. 37 is a configuration block diagram showing a second configuration example inside the peak power suppression / adjustment unit 60 ′ of the eighth transmitter. The same components as those in the first configuration example in FIG. 36 will be described with the same reference numerals. In FIG. 37, the configuration of the analog quadrature modulation version of the transmitter 1 ′ is shown. However, if the output from the transmitter is only the I component, the configuration of the digital quadrature modulation version of the transmitter 1 is obtained.

  As a second configuration example inside the peak power suppression / adjustment unit 60 ′ of the eighth transmitter of the present invention, as shown in FIG. 37, a peak having a plurality (n in the figure) of peak power suppression units. The power suppression unit 11 ′, the signal level adjustment unit 15, the input power calculation unit 16, the output power calculation unit 17, and the monitoring unit 41 are configured.

  In the second configuration example, the output power calculation target in the output power calculation unit 17 is different from that in the first configuration example, and the control method of the level control information in the monitoring unit 41 is the monitoring unit 18 of the first configuration. Is different.

  The output power calculation unit 17 of the second configuration example calculates the average output power of the input signal, and the multicarrier signal after multiplication with the level control information in the signal level adjustment unit 15 is input. The average output power of the multicarrier signal after the level control information multiplication is calculated and output.

When the monitoring unit 41 of the second configuration example realizes the third method (“feedback control by table”) as the method of determining the level control information for the multicarrier, the average input power (in the eighth transmitter, A table in which an assumed value of the average input power of the multicarrier) and an ideal value of the average output power of the control target signal (multicarrier signal in the eighth transmitter) are stored in association with each other is set in advance. ing.
Here, the ideal value of the average output power stores an optimum value of the average output power obtained by measurement when the average input power is an assumed value.

  Next, the outline of the level control information determination process for each carrier in the monitoring unit 41 of the second configuration example is an ideal value of the average output power corresponding to the average input power of the multicarrier output from the input power calculation unit 16. (Ideal output power) is read from the table, and the level control information is adjusted again so that the average output power of the multicarriers multiplied by the level control information from the output power calculation unit 17 becomes equal, and output to the corresponding signal level adjustment unit 15 It is processing to do.

  The specific processing flow of the determination process of the monitoring unit 41 level control information of the second configuration example is the control flow of the monitoring unit 41 in the fourth transmitter belonging to the first type described with reference to FIG. Since it is the same as that, description is abbreviate | omitted here.

  In the eighth transmitter described with reference to FIG. 37, the monitoring unit 41 obtains an ideal value of the average output power of the multicarrier signal using a table, and performs gain so that the actual average output power becomes the ideal value. As with the monitoring unit 32 of the third transmitter, the level control amount expected from the average input power of the multicarrier signal is calculated, or the level control amount is read from the table. The signal level adjusting unit 15 may output the signal level to the signal level adjusting unit 15. The signal level adjusting unit 15 may compare the average output power after the level control amount multiplication with the average input power and correct the gain value so as to be the same. Good.

  In the eighth transmitter, if the second configuration example is used for the peak power suppression / adjustment unit 60 ′, the average output power of the multicarrier signal after level adjustment is compared with the ideal value, and the average output power is ideal. Since the multi-carrier level adjustment is performed by feedback control that corrects the level control information until it becomes equal to the value and outputs it to the signal level adjustment unit 15, feed-forward control that performs processing for calculating the multi-carrier level control information As compared with the first method, the monitoring unit 41 can quickly specify the optimum level control information without using a complicated arithmetic circuit.

  The operation of the eighth transmitter of the present invention will be described with reference to FIG. 35. The transmission data of each carrier, which is digital data, is input to the corresponding carrier code multiplexed signal generators 10-1 to 10-n and is unique. The I and Q components are output after being spread-modulated by the spreading code of, and band-limited by the waveform shaping filters 12-1 to 12-n corresponding to the respective carriers, and further digital orthogonal modulation units 13-1 to 13-13 The carriers orthogonally modulated by -n and orthogonally modulated by the adders 14-1 and 14-2 are combined, and the I and Q components are output as multicarrier signals.

  Then, the peak power suppression / adjustment unit 60 ′ obtains the peak factor from the multicarrier power, performs peak power suppression on the multicarrier, and further performs level adjustment based on the average input power of the multicarrier, or multicarrier Level adjustment based on the average input power and the average power after peak power limitation is performed, and a multicarrier after level adjustment is output.

  According to the transmitter of the fourth type, it is determined by the actual power value of the multicarrier based on the average input power before peak suppression and the average output power after peak suppression in the peak power suppression unit 11 for the multicarrier. Since the level adjustment corresponding to the current operation status of the apparatus is performed on the multicarrier using the threshold value, the upper limit, and the lower limit value, the adverse effect of uniform level suppression applied to the section for obtaining the average power in the peak power suppression unit 11 is reduced. Adjustment can be made according to the average input level of the multicarrier, and particularly, the second and third problems described in the problem can be solved, and fluctuations in the level of the multicarrier signal can be suppressed on average.

  As a specific event, when the input level suddenly fluctuates in the multicarrier and is subject to peak control (suppression) in the peak power suppression unit 11, an averaging interval for calculating the peak factor in the peak power suppression unit 11 In the (suppression section), uniform peak suppression is applied and the multicarrier level is reduced overall, but the monitoring units 18 and 41 determine the peak power suppression unit based on the average power ratio before and after the multicarrier peak control (suppression). 11 is calculated so as to restore the uniform peak suppression performed in Step 11, and the gain level is multiplied by the signal level adjustment unit 15 corresponding to the multicarrier to recover the level. It will be suppressed.

  In the present invention described above, in the transmitters according to the first to third types, a plurality of input carriers are subjected to uniform level suppression of each carrier based on the total power in the peak power suppression unit 11 as a main line system. In the process of band limitation, quadrature modulation, and synthesis into a multi-carrier signal, the average input of the carrier in the control system (input power calculation unit, output power calculation unit, monitoring unit, signal level adjustment unit, multiplication unit) The carrier input to the transmitter by adjusting the level based on the power so that the average power of the carrier or multi-carrier in each part of the main line system becomes an ideal value that has recovered the harmful effect of the level suppression in the peak power suppression unit 11 Even if the input level fluctuates, the fluctuation of the carrier or multi-carrier signal level is suppressed and the multi-key output from the transmitter is finally output. The rear signal is effective can be stabilized.

  Further, in the present invention, the transmitter according to the fourth type is configured to obtain the average input power of the multicarrier signal in the control system in the process in which the combined multicarrier signal is subjected to level suppression in the peak power suppression unit 11. On the basis of this, the level adjustment is performed so that the average output power of the multicarrier becomes an ideal value that has recovered the harmful effects of level suppression in the peak power suppression unit 11, thereby causing fluctuations in the input level of the carrier input to the transmitter. Even if fluctuation occurs in the multicarrier signal immediately after combining, there is an effect that the fluctuation of the level of the multicarrier signal can be suppressed and the multicarrier signal finally output from the transmitter can be stabilized.

  Further, in the transmitter of the present invention, in the section where the peak suppression is operated by the peak power suppression unit 11, uniform peak suppression is applied and the multicarrier level is lowered overall, but the average input power and the average output power are reduced. Based on the threshold value, upper limit, lower limit value determined by the actual carrier or multi-carrier power value and the number of carriers in operation, etc., so as to adjust the level according to the current operation status of the device to each carrier or multi-carrier, Each carrier signal corresponding to an arbitrary section (frame, etc.) can be approximated to the level when using the reference data, and there is an adverse effect due to uniform peak suppression caused by a sudden level fluctuation performed by the peak power suppression unit 11. Even if fluctuations occur in the input carrier level, it is possible to stably suppress fluctuations in the level of each carrier signal on average. Can finally embodiment offers the advantage of being able to suppress variation in level in a multi-carrier signal.

Further, in the transmitter according to each type of the present invention, when the second method (“feedforward control by table”) is used as the level control information determination method in the monitoring unit, the level control information is associated with the table. Since the configuration for calculating the level control information becomes unnecessary, the configuration of the monitoring unit can be simplified and the time required for the output of the level control information can be reduced. This has the effect of reducing the deviation in the output timing of the level control information.
Further, when the second method (“feedforward control by table”) is used, the output power calculation unit 17 or the output power calculation units 17-1 to 17-n is not necessary in the configuration of each transmitter, and the first Compared with this method, the entire configuration of the transmitter can be reduced.

  Further, when the third method (“feedback control by table”) is used as the level control information determination method in the monitoring unit, the average output power of the carrier or multicarrier signal after level adjustment is compared with the ideal value, Since the level adjustment of the carrier or multicarrier signal is performed by feedback control that adjusts the level control information so that the average output power becomes an ideal value and outputs it to the signal level adjustment unit 15, the level of the carrier or multicarrier signal is adjusted. Compared to the feedforward control (first method) that performs the process of calculating the control information, the monitoring unit 41 has an effect that it can quickly identify the optimum level control information without using a complicated arithmetic circuit.

  Further, the transmitter of the present invention includes an input power calculation unit 16 and possibly an output power calculation unit 17, a monitoring unit 18, a signal level adjustment unit 15, and a multiplier 31 depending on the configuration of the conventional transmitter. It can be realized by adding. Therefore, the transmitter of the present invention can use the facilities of the conventional transmitter as it is, and thus has an effect of reducing the cost for installation.

  In the transmitters according to the third and fourth types so far, the average input power before peak power suppression in the peak power suppression unit 11 (limiter) provided for each carrier or multicarrier (and depending on circumstances) Although it has been described as a transmitter that adjusts the signal level of a signal whose peak power is suppressed based on the average output power after multi-carrier peak power suppression, the function is not limited to a limiter, and performs a non-linear operation, for example, A circuit that operates only at a level lower than a predetermined level, or an average input power of signals before and after a nonlinear filter or the like (and an average output power after multi-carrier peak power suppression in some cases) is output. You may adapt to the apparatus which adjusts the signal level of the signal to tune.

  The transmitter of the present invention described so far has a power level to be controlled, that is, adjusts the power level of the carrier or multicarrier signal based on the power level of each carrier or multicarrier signal. The voltage level may be set as a control target, and even in such a case, the same effect as described above can be obtained.

  Further, since the transmitter of the present invention described above is used as the transmitters 1 and 1 'in the transmission amplifiers of FIGS. 6 and 18, a stable level multi-carrier signal is supplied from the transmitters 1 and 1'. The occurrence of nonlinear distortion can be suppressed by the amplification in the power amplifying unit 4, and high-quality wireless transmission can be realized.

Further, the transmitter of the present invention changes the configuration of the carrier code multiplex signal generation unit 10 to change the radio communication method other than the CDMA communication method (for example, TDMA (Time Division Multiple Access) or OFDM (Orthogonal Frequency Division Multiplexing)). In this case, the same effect can be obtained.
In addition, the transmitter of the present invention can be used for devices other than base stations (for example, relay stations) by changing the configuration of the carrier code multiplexed signal generation unit 10.

  The present invention is suitable for a transmitter that can suppress, on average, fluctuations in the input level of a multicarrier signal to an amplifier in response to fluctuations in the input level of each carrier for a plurality of carriers.

It is a block diagram of the configuration of the transmitter according to the first embodiment of the present invention. It is a block diagram of the configuration of the transmitter according to the second embodiment of the present invention. It is a block diagram of the configuration of a transmitter according to a third embodiment of the present invention. 4 is a graph showing characteristics relating to an input setting level and an output level deviation when a signal is transmitted by one carrier of 32 codes when the transmitter according to the first embodiment of the present invention and the conventional CDMA base station transmitter are used. 6 is a graph showing characteristics relating to an input setting level and an output level deviation when transmitting a 2-carrier signal at the time of 32 code multiplexing in the transmitter according to the first embodiment of the present invention and the conventional CDMA base station transmitter. It is a block diagram of the configuration of a transmission amplifier used in a general CDMA base station. It is a block diagram of a general CDMA base station transmitter. It is explanatory drawing of the peak factor of a general amplifier. It is a flowchart of the calculation process of the level control information in the monitoring part 18 of the transmitter which concerns on 1st Example of this invention. It is a flowchart of the calculation process of the level control information in the monitoring part 18 of the transmitter which concerns on 1st Example of this invention. It is a flowchart of the output process of the level control information using the table in the monitoring part of the transmitter which concerns on the 1st-3rd Example of this invention. It is a flowchart of the calculation process of the level control information and the gain value of each carrier in the monitoring part 32 of the transmitter which concerns on 3rd Example of this invention. It is a flowchart of the calculation process of the gain value of the carrier in the monitoring part 32 of the transmitter which concerns on 3rd Example of this invention. It is a flowchart of the calculation process of the gain value of the carrier in the monitoring part 32 of the transmitter which concerns on 3rd Example of this invention. It is a block diagram of the configuration of a transmitter according to a fourth embodiment of the present invention. It is a flowchart of the calculation process of the gain value of the carrier in the monitoring part 41 of the transmitter which concerns on 4th Example of this invention. It is a structure block diagram of the modification of the transmitter which concerns on the 4th Example of this invention. It is another block diagram of a configuration of a transmission amplifier used in a general CDMA base station. FIG. 10 is a configuration block diagram of a transmitter according to a fifth embodiment of the present invention. It is a structure block diagram of the transmitter which concerns on the 6th Example of this invention. It is a block diagram which shows another example of an internal structure of the digital signal processing part in the 6th transmitter of this invention. It is a flowchart of the setting process of the level control information in the monitoring part of the 5th transmitter of this invention. It is a block diagram of the configuration of the first transmitter (7-1th transmitter) according to the seventh embodiment of the present invention. It is a block diagram which shows the 1st structural example inside the peak electric power suppression and adjustment part of the 7-1 transmitter of this invention. It is a flowchart of the setting process of the level control information of each carrier in the monitoring part of the 7th transmitter of this invention. It is a flowchart of the output process of the level control information using the table in the monitoring part of a 7th transmitter. It is the graph which showed the example of a simulation regarding the input setting level and the output level at the time of 1 code | symbol transmission of the signal at the time of 32 code multiplexing in a 7th transmitter and the transmitter of a prior art. It is the graph which showed the example of a simulation regarding an input setting level and a level deviation. It is the graph which showed the example of a simulation regarding the input setting level and output level with respect to a level fluctuation carrier (carrier 1) at the time of 32 code multiplexing signal 2 carrier transmission. 5 is a graph showing a simulation example regarding a difference between an input setting level and an input / output level for carrier 1; It is the graph which showed the example of a simulation regarding the input setting level of the carrier 1, and the input-output level difference of the carrier 2 with respect to a level fixed carrier (carrier 2). It is a block diagram which shows the 2nd structural example inside the peak electric power suppression and adjustment part 60 of the 7-1 transmitter of this invention. It is a structure block diagram of the 2nd transmitter (7th-2 transmitter) concerning the 7th example of the present invention. It is a block diagram of the configuration of a third transmitter (seventh-3 transmitter) according to the seventh embodiment of the present invention. It is a block diagram of the configuration of the transmitter (eighth transmitter) according to the eighth embodiment of the present invention. It is a block diagram which shows the 1st structural example inside the peak power suppression and adjustment part of the 8th transmitter of this invention. It is a block diagram which shows the 2nd structural example inside the peak electric power suppression and adjustment part of the 8th transmitter of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1, 1 '... Transmitter, 2 ... D / A converter, 3 ... Frequency conversion part, 3' ... Analog quadrature modulation part, 4 ... Power amplification part, 10, 50 ... Carrier code multiple signal generation part, 11, 21 DESCRIPTION OF SYMBOLS 51 ... Peak power suppression part, 12, 52 ... Waveform shaping filter, 13, 53 ... Digital quadrature modulation part, 14, 54 ... Adder, 15 ... Signal level adjustment part, 16, 16 '... Input power calculation part, 17 ... Output power calculation unit 18, 32, 41 ... monitoring unit, 31 ... multiplier, 60, 60 '... peak power suppression adjustment unit, 70 ... digital signal processing unit

Claims (4)

A transmitter that suppresses fluctuations in the input level of a multicarrier signal obtained by combining a plurality of carriers,
The presence / absence of a peak is detected by comparing the ratio between the instantaneous power and the average power of the sum of the input power levels of each carrier with a preset peak factor threshold . A peak suppression unit that outputs a carrier in which the power level of each carrier is suppressed so that the combined power of each carrier becomes a specified power by uniformly multiplying a multiplication coefficient corresponding to the sum of the power levels;
An input power calculator for calculating an average input power level for each carrier before input to the peak suppressor;
An output power calculation unit that calculates an average output power level for each carrier after being output from the peak suppression unit;
As level control information for determining a gain value based on the average input power level calculated by the input power calculation unit and the average output power level calculated by the output power calculation unit and controlling the signal level of the multicarrier signal A monitoring unit for outputting the gain value ;
A transmitter comprising: a level adjusting unit configured to adjust a level of the multicarrier signal based on level control information output from the monitoring unit. A transmitter that suppresses fluctuations in the input level of the multicarrier signal so that the signal level of the multicarrier signal obtained by combining a plurality of carriers is adjusted,
The presence / absence of a peak is detected by comparing the ratio between the instantaneous power and the average power of the sum of the input power levels of each carrier with a preset peak factor threshold . A peak suppression unit that outputs a carrier in which the power level of each carrier is suppressed so that the combined power of each carrier becomes a specified power by uniformly multiplying a multiplication coefficient corresponding to the sum of the power levels;
An input power calculator for calculating an average input power level for each carrier before input to the peak suppressor;
An output power calculation unit that calculates an average output power level for each carrier after being output from the peak suppression unit;
Level for determining the gain value for each carrier based on the average input power level calculated by the input power calculation unit and the average output power level calculated by the output power calculation unit, and controlling the signal level of each carrier A monitoring unit that outputs the gain value as control information;
A transmitter comprising: a level adjusting unit that adjusts the level of each carrier based on the corresponding level control information for each carrier. A transmitter that suppresses fluctuations in the input level of a multicarrier signal obtained by combining a plurality of carriers,
The presence / absence of a peak is detected by comparing the ratio between the instantaneous power and the average power of the sum of the input power levels of each carrier with a preset peak factor threshold . A peak suppression unit that outputs a carrier in which the power level of each carrier is suppressed so that the combined power of each carrier becomes a specified power by uniformly multiplying a multiplication coefficient corresponding to the sum of the power levels;
An input power calculation unit that calculates the total average input power level for each carrier before input to the peak suppression unit;
An output power calculation unit that calculates the average output power level of the sum for each carrier output from the peak suppression unit;
A gain value is determined based on the average input power level of the sum calculated by the input power calculator and the average output power level of the sum calculated by the output power calculator, and the signal level of the multicarrier signal is controlled. A monitoring unit that outputs the gain value as level control information;
A transmitter comprising: a level adjusting unit configured to adjust a level of the multicarrier signal based on level control information output from the monitoring unit. A transmitter that suppresses fluctuations in the input level of a multicarrier signal obtained by combining a plurality of carriers,
The presence / absence of a peak is detected by comparing the ratio between the instantaneous power and average power of the power level of the input multi-carrier signal with a preset peak factor threshold . A peak suppression unit that outputs a multicarrier signal in which the power level is suppressed so that the power of the multicarrier becomes a specified power by multiplying a multiplication coefficient corresponding to the power level;
An input power calculator that calculates an average input power level for the multicarrier signal before input to the peak suppressor;
An output power calculator that calculates an average output power level for the multicarrier signal output from the peak suppressor;
Level control information for determining a gain value based on the average input power level calculated by the input power calculation unit and the average output power level calculated by the output power calculation unit, and controlling the signal level of the multicarrier signal. A monitoring unit to output,
A transmitter comprising: a level adjusting unit configured to adjust a level of the multicarrier signal based on level control information output from the monitoring unit.

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