KR100475180B1 - Diminish appatatus for Peak to Average Ratio in multi-carrier transmitter - Google Patents

Abstract

In the present invention, a transmitter of a CDMA base station can reduce the PAR by detecting a maximum value above a threshold value, especially from each channel signal, so that more traffic can be processed by the same output amplifier.

According to an aspect of the present invention, there is provided a PA reduction apparatus for a multicarrier transmitter, comprising: first and second multipliers for spreading each channel signal with a spreading code; Maximum limit signal generation means for detecting the magnitude of each spread channel signal, comparing the threshold value with a maximum value, and generating a maximum limit signal corresponding to the maximum value of the detected threshold value or more; First and second delay units for delaying each channel signal by synchronizing the output signals of the first and second multipliers with the output of the maximum limit signal generating means; First and second subtractors configured to subtract each channel signal delayed and output from the first and second delay units to the maximum limit signal to output each channel signal whose maximum value is less than or equal to a threshold value; And a multicarrier transmitter for accumulating and adding different carrier frequencies to each channel signal of which the maximum value is limited.

Description

PAIR reduction device for multicarrier transmitters {Diminish appatatus for Peak to Average Ratio in multi-carrier transmitter}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high power amplifier for use in a transmitter of a code division multiple access (CDMA) base station, and in particular, a low output amplifier by limiting the peak to average ratio (PAR) of a high output amplified signal. The present invention relates to a PAL limiter and a method thereof, which can be used in the same way as an amplifier of a large output and that can process more traffic with an amplifier of the same output.

To transmit a CDMA digital signal, a peak power is calculated and a high output amplifier having a sufficient output capable of amplifying and transmitting the maximum output at a constant amplification rate in the linear amplification region of the amplifier. Should be used. In addition, CDMA communication is a method of converting a plurality of subscriber channels into digital signals, multiplexing them, and then simultaneously transmitting the signals using one communication channel, which has an advantage of efficiently using frequencies.

However, the transmitter used in the CDMA method requires the average power required by one subscriber channel to digitize and multiplex signals of multiple subscriber channels, and to transmit multiple subscriber signals through one transmission channel. ), A transmitter using a high-power amplifier that produces an output equal to the product of the peak to average ratio (PAR) is to be used.

As multiple channels are multiplexed, the PAR becomes larger and larger. In particular, since a PAR of a signal output from a multi-carrier transmitter has a larger PAR than a single carrier, an amplifier having a larger output should be used. Since such a high power amplifier must be able to amplify the required output in the linear operating region, the cost of the high power amplifier for amplifying the radio frequency becomes high, and the high capacity due to the large amount of heat generated by the high power transmitter as described above. The heat dissipation device must be used separately, and the volume of the entire transmitter of the CDMA base station using the high power amplifier is increased, and the power consumed by the high power amplifier is high.

1 is a block diagram of a base station for transmitting a conventional CDMA signal.

Referring to FIG. 1, a digital multiplexer 11 that receives and multiplexes a plurality of subscriber digital signals, a voltage limiter 12 that limits and outputs a voltage of an input signal, and prevents the signal of the specific band from passing through. The band limiting filter 13, the output of the band limiting filter 13 and the local oscillation frequency 15 of the local oscillator are mixed and modulated at high frequency and applied to the driver amplifier 16. It is a configuration to include.

Referring to FIG. 1, a conventional PAR reduction apparatus will be described. 1 is a scheme for a single carrier transmitter.

When multiple subscriber digital signals are input, the digital multiplexer 11 multiplexes them and outputs them, and the voltage limiter 12 limits the voltages of the multiplexed signals and outputs them. That is, when the multiplexed baseband signal is input, the voltage limiter 12 has an operation characteristic as shown in FIG. 2A and outputs by clipping a maximum value signal (A or more and -A or less) of the input signal. do.

The band limiting filter 13 receives the output of the voltage limiter 12 and restricts the signal of a specific band from passing through as shown in FIG.

Then, the frequency uplink regulator 14 mixes the signals applied from the local oscillation frequency (f _Lo ) 15 of the local oscillator and the voltage limiter 12, modulates them to high frequency, amplifies them through the driver amplifier 16, and sends them out. Done.

When any signal having the maximum signal P1 is input as shown in FIG. 3A, the maximum signal is clipped and removed as shown in FIG. 3B by the voltage limiter 12.

4 shows a signal in the frequency domain. When the signal before clipping as shown in 4a passes through the voltage limiter 12, the noise component Sn appears as shown in 4b, and the signal passes through the voltage limiter 12. Passing the band-limiting filter 13 removes the out-of-band noise Sn 'as shown in 4c.

As such, by deliberately limiting the output using the voltage limiter 12 to reduce the PAR, the input voltage of the high output amplifier is limited to generate any low bit error rate. In addition, the band limiting filter 13 is used to prevent noise from distortion and distortion at the output of the high output amplifier.

1 above is a method for a single carrier transmitter and is not suitable for a multicarrier transmitter architecture.

5 and 6 show the structure of the multi-carrier transmitter, respectively.

FIG. 5 illustrates a first voltage limit for limiting a voltage by receiving outputs of a plurality of digital multiplexers 21a through 21n and a plurality of digital multiplexers 21a through 21n as a first embodiment. Groups 22a to 22n, a plurality of band limiting filters 23a to 23n for preventing a signal of a specific band from passing through, and a plurality of bands for outputting the output of the band limiting filter by multiplying different carriers f1 and f2. Mixers 24a to 24n, a cumulative adder 25 for cumulatively adding the outputs of the plurality of mixers, a digital-to-analog converter (D / A) 26 for converting the outputs of the cumulative adders into analog signals, and And a frequency up-modulator 27 for mixing the local oscillation frequency with the output of the digital-to-analog converter and modulating it at a high frequency.

FIG. 5 shows a plurality of multiplexers 21a to 21n, voltage limiters 22a to 22n, and band limiting filters 23a to 23n, and output signals of the band limiting filters 23a to 23n at different frequencies. Multiply the different carriers f1 and f2 in the mixers 24a to 24n so that they are located, and accumulate and add this signal in the accumulator adder 25 and the analog signal in the digital-to-analog converter (D / A) 25. Convert to Then, the frequency uplink modulator 27 is multiplied by the local oscillation frequency signal f _L0 to be modulated and output to a high frequency signal having multiple carriers.

The voltage limiters 22a to 22n, which are PAR reduction devices in FIG. 5, reduce the PAR of each channel. However, the output signal from the multicarrier transmitter is output in combination with the signal of each channel, so that the maximum signal generated in any channel may not generate the maximum signal after combining into the multicarrier, and each channel is the maximum value. It does not have a signal but can generate a maximum signal after combining. Therefore, instead of sensing and clipping the maximum signal for each channel, it is necessary to clip after combining the values of these channels and determining whether the maximum value is present.

6 multiplies the outputs of the multiplexers 31a through 31n by different frequencies in the mixers 32a through 32n, outputs them as multiple carriers, accumulates in the accumulator 33, and accumulates the accumulated signals in the voltage limiter 34. Pass through the band limiting filter 35 and the digital-to-analog converter 36, and multiplies the local oscillation frequency signal to modulate the high frequency signal.

In FIG. 6, after the multicarrier is combined, clipping and filtering are performed. In this case, when the multicarrier combined signal is clipped to the voltage limiter 34, the signal of each channel has out-of-band noise as shown in FIG. 7. As a result, these noise components affect adjacent channels and degrade the signal.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and the multicarrier transmitter detects the presence or absence of the maximum value of the input channel signal and reduces the maximum value with a pulse corresponding to the detected maximum value, thereby reducing the amplifier to a low output. It is an object of the present invention to provide a PA reduction device for a multicarrier transmitter, which can be used in the same way as an amplifier of a large output while processing more traffic with an amplifier of the same output.

It is an object of the present invention to provide a PA reduction apparatus in which each channel signal is separated into an in-phase signal and an orthogonal signal, or is applicable to a system that is not divided into an in-phase signal and an orthogonal signal.

The present invention detects a maximum value of an input signal, multiplies the weighted value, and generates a maximum limit signal corresponding to a maximum value signal above a threshold value of the input signal in order to generate a maximum limit signal for reducing the maximum value of any input signal. It is an object of the present invention to provide a PA reduction device capable of reducing PAR by subtracting an input signal.

In the present invention, the weight is obtained by using the maximum value of the input signal, the threshold value for determining the presence or absence of the maximum value, the number of carriers used in the transmitter, and the magnitude of the impulse to correspond to the maximum value of the input signal or more. It is an object of the present invention to provide a pieal reduction device characterized in that.

PEL reduction device for a multicarrier transmitter according to the present invention for achieving the above object,

In a multicarrier transmitter,

First and second multipliers for spreading each channel signal with a spreading code,

Maximum limit signal generating means for detecting the magnitude of each spread channel signal, comparing the threshold value with a maximum value, and generating a maximum limit signal corresponding to the maximum value of the detected threshold value or more;

First and second delay units for delaying each channel signal by synchronizing the output of each channel signal of the first and second multipliers with the output of the maximum limit signal generating means;

First and second subtractors for subtracting each channel signal delayed and output from the first and second delay units to the maximum limit signal and outputting each channel signal whose maximum value is less than or equal to a threshold value;

And a multicarrier transmitter for accumulating and adding different carrier frequencies to each channel signal of which the maximum value is limited.

Preferably, each channel signal is a signal in which the in-phase and quadrature signals are not separated.

delete

The interpolation unit may further include an interpolation unit configured to interpolate each of the spread channel signals with a predetermined interpolation vector in order to increase the sampling rate of each spread channel signal.

Preferably, the maximum limit signal generating means includes: an absolute value detector for detecting magnitude by taking an absolute value in each channel signal, a second cumulative adder for cumulatively adding the output of the absolute value detector to obtain a sum of input signals, and a cumulative adder; A maximum value detector for detecting a maximum value equal to or greater than a threshold value from a sum of input signals, an impulse generator for generating an impulse corresponding to the detected maximum value, and a cumulatively added signal and number of carriers of the second cumulative adder And a weight calculator configured to calculate a weight to limit the maximum value by using a threshold value to determine whether the peak signal is present, and a fifth multiplier to generate a maximum limit signal by multiplying the output impulse of the impulse generator by the weight. It features.

Preferably, the maximum limit signal generating means includes: a square generator for squared in-phase and quadrature signals, a channel cumulative adder for obtaining a channel sum of the squared in-phase and orthogonal signals, and a magnitude of the output of the channel cumulative adder for detecting magnitude. A third cumulative adder that accumulatively adds the root processor and the output of the root processor to obtain an input signal sum, a maximum detector that detects a threshold maximum from a sum of the cumulatively added input signals and a threshold value, and the detected maximum value; A weight calculation unit configured to calculate a weight to limit the maximum value by using an impulse generator for generating an impulse corresponding to the second cumulative adder, a cumulatively added signal and a number of carriers, and a threshold value for determining whether a peak signal is present; And a fifth multiplier for generating a maximum limit signal by multiplying the output impulse of the impulse generator by the weight. It is characterized by including.

Preferably, the weight calculator divides the sum of the input signal and the maximum signal threshold by the number of carriers processed in the multicarrier transmitter, and divides this value by the impulse size to calculate the weight of the impulse. do.

The method may further include a low pass filter outputting the pulse signal of the maximum limit signal obtained by multiplying the impulse to the band and outputting the resultant signal to the first and second subtractors.

Hereinafter, described in detail with reference to the accompanying drawings.

FIG. 8 is a block diagram illustrating a PA reduction apparatus for a multicarrier transmitter according to a first embodiment of the present invention.

Referring to FIG. 8, first and second multipliers 110 and 111 for spreading a signal of each channel with a spreading code, interpolators 120 and 121 for interpolating outputs of the first and second multipliers 110 and 111, and each A maximum limit signal generator 130 which detects a maximum value signal of a channel signal in advance and generates a maximum limit signal corresponding to the maximum value of each channel signal; an output of the interpolator 130 and a maximum limit signal generator 130 The first and second delay units 140 and 141 delaying to match the output synchronization of the first and second delay units 140 and 141, and the maximum value of each channel signal output from the first and second delay units 140 and 141. Different carrier frequencies f ₁ and f _N are respectively applied to the first and second subtracting units 150 and 151 and the output signals of the first and second subtracting units 150 and 151, which are subtracted and output by the maximum limit signal of the signal. The third and fourth multipliers 160 and 161 to multiply, and the third and fourth multipliers ( A cumulative adder 170 that accumulates and sums the outputs of the 160 and 161, a digital / analog converter 180 that converts the output of the cumulative adder 170 into an analog signal, and modulates the analog converted signal at a high frequency. A frequency uplink modulator 190 and a high frequency amplifier 200 amplifying the output of the frequency uplink modulator 190 and radiates through the antenna 210.

Here, the maximum limit signal generator 130 may accumulate and add the absolute value detectors 131a to 131b for detecting magnitude by taking an absolute value on each channel signal and the outputs of the absolute value detectors 131a to 131b. A cumulative adder 132, a maximum value detector 133 which detects a maximum value equal to or greater than a threshold value by comparing the cumulatively added signal with a threshold value, an impulse generator 134 for generating a signal corresponding to the detected maximum value, and A weight calculator 135 for calculating a weight to limit the maximum value by using the cumulative added signal of the second cumulative adder 132, the number of carriers, and a reference value to determine whether the peak signal is present; and the impulse generator 134. The fifth multiplier 137 for generating a maximum limit signal by multiplying the output impulse of the multiplier by the weight, and the low pass for limiting the pulse signal of the maximum limit signal in a band to the first and second subtractors 150 and 151. Phil It is a structure including the rotor 137.

Referring to the accompanying drawings, a pieal reduction apparatus of a multicarrier transmitter according to the present invention configured as described above is as follows.

8 is a diagram illustrating a system in which a channel is not separated into in-phase and quadrature signals according to the first embodiment of the present invention.

Referring to FIG. 8, each channel signal is spread by being multiplied by a spreading code in the first and second multipliers 110 and 111, and the first and second interpolators 120 and 121 each of the channel signals spread by the interpolation vector. By interpolating by a constant multiple, the sampling rate is increased and output.

The output signals of the first and second interpolators 120 and 121 are input to the first and second delay units 140 and 141 and the maximum limit signal generator 130. The maximum limit signal generator 130 generates and outputs a pulse for removing the maximum value signal when each channel signal has a maximum value.

The first and second delay units 140 and 141 delay the timing of the channel limit signal and the maximum limit signal of the maximum limit signal generator 130 to coincide (synchronize).

Each channel signal output from the first and second delay units 140 and 141 is subtracted by the maximum limit signal Pc generated by the maximum limit signal generator 130 in the first and second subtractors 150 and 151. Only the maximum component is removed.

Each channel signal whose maximum value is removed from the first and second subtractors 150 and 151 is multiplied by different carrier frequencies Carrier 1 to Carrier n in the third and fourth multipliers 160 and 161. Are located on different frequencies.

The accumulator adder 170 accumulatively adds the outputs of the third and fourth multipliers 150 and 151 to combine and output the multicarrier, and the digital-to-analog converter (D / A) 180 converts each channel signal into an analog signal. The frequency uplink modulator 190 multiplies a high frequency carrier frequency (RF Carrier) by a multicarrier signal and modulates the high frequency signal, and the modulated high frequency signal is amplified by the RF AMP 200 and the antenna 210. Is emitted through). Here, the high frequency carrier frequency multiplied by the uplink modulator 190 is an embodiment, and may be modulated by multiplying the local oscillation frequency f _LO by way of example.

The third and fourth multipliers 160 and 161, the cumulative adder 170, and the subsequent stages can be changed by the characteristics of the multicarrier transmitter, which enables transmission from one transmitter to multiple carriers, thereby simplifying the multicarrier transmitter. It can also be configured.

Specifically, the maximum limit signal generator 130 will be described with reference to FIG. 9 as follows.

The maximum limit signal generator 130 may include an absolute value detector 131a to 131b, an accumulator adder 132, a maximum value detector 133, an impulse generator 134, a weight calculator 135, a fifth multiplier 136, A low pass filter (LPF) 137.

The first and second absolute value detectors 131 to 131b take an absolute value when the respective channel signals passing through the first and second multipliers 110 and 111 and the first and second interpolators 120 and 121 are input. The size is obtained.

The cumulative adder 132 accumulates and sums the magnitudes detected by the first and second absolute value detectors 131a to 131b, and calculates and outputs the sum T of the input signals as shown in FIG. In this case, the sum T of the input signals is input to the maximum detector 133 and the weight calculator 135, respectively, and the maximum detector 133 determines the sum T of the input signals and the reference value A to determine the maximum signal. ) Is transmitted to the impulse generator 134 that the input signal has the maximum value when the sum of the input signals (TA, T-(-A)) is large.

Then, the impulse generator 134 generates an impulse P corresponding to the corresponding input signal when the maximum value signal is generated and outputs it as shown in FIG. 12 (b), and generates 0 when it is not a peak signal. That is, the impulse generator 134 generates and outputs a pulse having a positive value corresponding to the position of the maximum value exceeding the reference value.

In this case, the impulse generated by the impulse generator 134 and the weight calculated by the weight calculator 135 are multiplied by the fifth multiplier 136 to multiply the maximum limit signal corresponding to the maximum value signal of FIG. ) Will occur. The weight is multiplied by the generated impulse so that a pulse signal having a magnitude exceeding a reference value is output in terms of a positive / negative value in FIG.

Here, the weight calculation unit 135 determines the magnitude of the pulse signal to remove the maximum signal, the weight value is the sum (T) of the input signal, the reference value (A) to determine whether the peak signal, the multicarrier transmitter It is determined by the number N of carriers to be processed. If this is expressed as an equation, Equation 1 is obtained.

Here, in T-A, T is the sum (± T) of the input signal and A is a reference value for determining whether the peak signal is represented by T-A and T-(-A). For example, if the maximum value of any input signal is 10, -8 and reference value A is ± 7, 10-7 is 3, -8-(-7) is -1, and the determined value removes the maximum signal. The magnitude of the pulse signal to do.

When the signal obtained by multiplying the impulse generated by the impulse generator 134 and the weight of the weight calculator 135 passes through the low pass filter 137, a signal Pc for removing the band-limited maximum value is output. This allows the band of the generated pulse to be limited so that it does not affect the adjacent channel.

Therefore, the maximum value of the signal delayed in the first and second delay units 140 and 141 is reduced by the maximum limit signal output from the maximum limit signal generator 130.

FIG. 10 is a multicarrier transmitter of a system in which an in-phase and orthogonal signal is separated in each channel in the PA reduction apparatus for a multicarrier transmitter according to an exemplary embodiment of the present invention.

When each channel signal is input, the first and second multipliers 311 and 313 are output as in-phase and quadrature signals I and Q spread by the spreading codes PN _I and PN _Q , and the in-phase and quadrature signals I are spread. Q is interpolated at a predetermined multiple M by the first and second interpolators 321 and 323.

The outputs of the first and second interpolators 321 and 323 are input to the maximum limit signal generator 330 and the first and second delay units 341 and 343, respectively. After the sum of the in-phase and quadrature components is obtained, the maximum value of the threshold value A or more is detected, and a maximum limit signal Pc corresponding to the detected maximum value signal is generated and output.

Then, the first and second subtractors 351 and 353 subtract the in-phase and quadrature signals delayed by the first and second delay units 341 and 343 by the maximum limit signal, so that the signal whose maximum value is limited, that is, the maximum signal above the threshold value is Outputs below the threshold.

The phase shifters 361 and 363 multiply a 90 ° fast carrier signal only to the in-phase signal of the first and second subtracting units 351 and 353 and the in-phase signal, and multiply only the carrier signal by the orthogonal signal, whereby the in-phase and quadrature signals It is output as multiple carriers by carriers 90 phase shifted from each other.

Cumulative adders 361 and 363 add and accumulate the outputs of the phase shifters 361 and 363, the digital-to-analog converter 370 converts them into analog signals, and the frequency up-converter 380 up-modulates the RF carriers. Radiate through.

To this end, as shown in FIG. 11, the maximum limit signal generator 330 includes the first and second multipliers 331a and 331b, the channel accumulator adders 332a and 332b, the root processing units 333a and 333b, It consists of a three cumulative adder 334, a maximum value detector 335, an impulse generator 336, a weight calculator 337, a fourth multiplier 338, and a low pass filter 339.

The first and second squarers square and output the in-phase and quadrature signals I and Q of each of the spread channels, and the channel accumulators 332a and 332b add and accumulate the in-phase and quadrature signals of each channel. In addition, the root processing units 332a and 332b calculate a magnitude by applying a root to the output signals of the channel accumulators 332a and 332b, and the accumulator adder 334 accumulatively adds the root-processed channel signals to sum the channel signals. Will output (T).

The sum of the channel signals output from the cumulative adder 334 is input to the maximum value detector 335 and the weight calculator 337, and the maximum value detector 334 is equal to or greater than the threshold value among the sum of the channel signals and is equal to or greater than the threshold value. The signals TA and T-(-A) are detected and output, and the impulse generator 336 generates and outputs a pulse having a positive magnitude corresponding to the maximum signal above the threshold. However, if the maximum value signal is not detected, zero is generated.

Here, the weight calculation unit 135 determines the magnitude of the pulse signal to remove the maximum signal, the weight value is the sum (T) of the input signal, the reference value (A) to determine whether the peak signal, the multicarrier transmitter It is determined by the number N of carriers to be processed. If this is expressed as an equation, Equation 1 is obtained.

--- Equation 1

Here, in T-A, T is the sum (± T) of the input signal and A is a reference value for determining whether the peak signal is represented by T-A and T-(-A). For example, if the maximum value of any input signal is 10, -8 and reference value A is ± 7, 10-7 is 3, -8-(-7) is -1, and the determined value removes the maximum signal. The magnitude of the pulse signal to do.

The impulse corresponding to the maximum value generated from the impulse generator 336 and the weight calculated by the weight calculator 337 are multiplied by the third multiplier 338 to output the maximum limit signal, and the maximum limit signal Pc is low. The band is limited by the pass filter 339 and input to the first and second subtracting units 351 and 353, respectively, to limit the maximum component of the in-phase and quadrature signals to be below the threshold by the maximum limit signal.

In addition, as shown in FIG. 12, if a maximum signal equal to or greater than the threshold value A exists in the signal of (a), an impulse P corresponding thereto is generated, and the threshold is generated in the generated impulse as shown in (c). By multiplying the weight indicating how much greater than the value, the generated maximum impulse signal is generated as a signal proportional to the magnitude of the weight as a positive or negative signal.

In an exemplary embodiment, a PAR reduction apparatus for generating a pulse corresponding to a maximum value of an arbitrary input signal and limiting the maximum value may include multi-carrier CDMA (DMA-CDMA), OFDM-CDMA, etc. It can be applied as a device to reduce the peak-to-average ratio (PAR) to all CDMA base stations and terminals requiring a carrier.

As described above, the PA reduction apparatus for a multicarrier transmitter according to the present invention reduces the PA of the transmission power in a CDMA multicarrier transmitter, thereby lowering the peak power and using a low amplifier. The cost of a transmitter using an amplifier is low, and heat generated by a high power transmitter can be reduced, unnecessary power can be saved, and the size of the transmitter can be reduced. In addition, it is a device that reduces Peak-to-Average (PAR) in all CDMA base stations and terminals that require multicarriers such as MC-CDMA (multicarrier CDMA) and OFDM-CDMA as well as conventional DS-CDMA (direct sequence CDMA). Applicable

1 is a block diagram of a single carrier transmitter of a base station transmitting a conventional CDMA scheme.

FIG. 2 is a view showing output characteristics of the voltage limiter and the band limiting filter of FIG.

3 illustrates an input / output signal of the voltage limiter of FIG. 1.

4 is a diagram illustrating a signal in a frequency domain before, after clipping, and after filtering of an input signal in FIG. 1;

5 is a diagram illustrating a first embodiment of a conventional multicarrier transmitter.

6 illustrates a second embodiment of a conventional multicarrier transmitter.

FIG. 7 is a diagram showing output characteristics when clipping signals combined with a multicarrier in FIG.

8 is a block diagram illustrating a PAR reduction apparatus for a multicarrier transmitter according to the first embodiment of the present invention.

FIG. 9 is a detailed configuration diagram of the maximum limit signal generator of FIG. 8; FIG.

10 is a block diagram illustrating a PAR reduction apparatus for a multicarrier transmitter according to a second embodiment of the present invention.

FIG. 11 is a detailed configuration diagram of the maximum limit signal generator of FIG. 10. FIG.

12 illustrates an example of generating a maximum limit signal in a maximum limit signal generator according to an exemplary embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

110,111,160,161,136,311,313 ... multiplier

120,121,321,323 ... Interpolator

130,330 ... Maximum limit signal generator

140,141,341,343 ... Delayed 150,151,351,353 ... Subtracted

170,132,370,334 ... cumulative adder 180,280 ... digital / analog converter

190,290 ... Frequency Upconverter 200,400 ... High Frequency Amplifier

Claims (8)

In a multicarrier transmitter, First and second multipliers for spreading each channel signal with a spreading code, A maximum limit signal generation means for detecting the magnitude of each spread channel signal, comparing the threshold value with a maximum value of the lease value, and generating a maximum limit signal corresponding to the detected maximum value; First and second delay units for delaying synchronization of each channel signal spread by the first and second multipliers with the maximum limit signal of the maximum limit signal generator; First and second subtractors for subtracting each channel signal delayed from the first and second delay units by the maximum limit signal of the maximum limit signal generating means and outputting each channel signal whose maximum value is less than or equal to a threshold value; ; And a multicarrier transmitter for accumulating and adding different carrier frequencies to each channel signal whose maximum value is limited from the first and second subtractors. The method of claim 1, And each channel signal is a signal in which in-phase and quadrature signals are not separated. delete The method of claim 1, And an interpolation unit for interpolating a predetermined interpolation vector to increase a sampling rate of each spread channel signal. The method of claim 1, The maximum limit signal generating means includes an absolute value detector which detects magnitude by taking an absolute value of the respective channel signals, and a second cumulative adder that accumulatively adds the magnitude of each channel signal detected by the absolute value detector to obtain an input signal sum. A maximum value detector for detecting a maximum value of a threshold value or more from a sum of the cumulatively added input signals, an impulse generator for generating an impulse corresponding to a maximum value of a threshold value or more detected by the maximum value detector, A weight calculator configured to calculate a weight to limit the maximum value using a sum of the cumulatively added input signals of the second cumulative adder, the number of carriers processed in the multicarrier transmitter, and a threshold value to determine whether the peak signal is present; And generating a maximum limit signal by multiplying the output impulse of the impulse generator by the weight. The piezoelectric reducing device for a multicarrier transmitter, characterized in that it comprises a fifth multiplier. The method of claim 1, The maximum limit signal generating means includes: a root squarer for square of in-phase and quadrature signals, a channel cumulative adder for obtaining a channel sum of the squared in-phase and orthogonal signals, and an output channel sum of the channel cumulative adder for detecting magnitudes; A third cumulative adder that accumulatively adds the detected magnitudes of the root processor, a cumulative addition of the detected magnitudes of the root processor, and a maximum value equal to or greater than a threshold from a sum of the cumulatively added input signals in the third cumulative adder. Of the maximum value detection unit for detecting a signal, an impulse generator for generating an impulse corresponding to the maximum value detected by the maximum value detection unit, a cumulatively added input signal of the third cumulative adder, and a carrier for processing in the multicarrier transmitter. Number and weights to limit the maximum using thresholds to determine peak signals. And a weight multiplier and a fifth multiplier generating a maximum limit signal by multiplying the output impulse of the impulse generator by the weight. The method according to claim 5 or 6, The weight calculator divides the sum of the accumulated input signals and the maximum signal threshold value by the cumulative adder by the number of carriers processed in the multicarrier transmitter, and divides this value by the impulse size to calculate the weight of the impulse. Pieal reduction device for multicarrier transmitter, characterized in that. The method according to claim 5 or 6, And a low pass filter which limits the pulse signal of the maximum limit signal obtained by multiplying the impulse by a weight and outputs it to the first and second subtractors.