JP2003224496A - Transmitter/receiver, radio communication system, and transmitting/receiving method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify the configuration of a part relating to equalization without degrading the reception quality, even if fluctuations in a transmission line occur with respect to one of transmitter/receivers for conducting radio communication with each other. <P>SOLUTION: The first transmitter/receiver 100 among the first and second transmitter/receivers, which make communication with each other, comprises an equalization processing section 110 for applying a part of equalizing processing to a transmission signal in advance; the other part of the equalization processing is conducted in the receiving section of the second transmitter/ receiver to obtain a reception signal, thereby simplifying the second transmitter/ receiver by just that much. Also, since the receiving section of the second transmitter/receiver conducts a part of the equalization processing, receiving section of the second transmitter/receiver can also conduct the equalization processing corresponding to a rapidly changing transmission channel environment, even if the environment changes rapidly; and as this result, the second transmitter/receiver can be prevented from degrading in the reception quality. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission / reception device, a wireless communication system and a transmission / reception method, for example, a mobile phone in a mobile communication system, a communication terminal device such as an information terminal having a mobile phone function and a computer function, and a communication terminal device. It is suitable for application to a wireless base station device that performs wireless communication.

[0002]

2. Description of the Related Art Conventionally, in this type of wireless communication system,
An equalization process is generally used as a process for restoring a signal characteristic that varies according to the state of a wireless transmission path to obtain a high quality received signal. As one of the equalization processes, there is an adaptive equalization process for obtaining the state of the transmission line based on a known signal included in the received signal and adaptively equalizing the received signal according to the state of the transmission line.

The adaptive equalization process is usually realized by providing an equalization filter at the receiving end of a channel in a transmitting / receiving device which communicates with each other. Conventionally, as one of the adaptive equalization processes, a decision feedback equalizer (DFE: Decision F) is used.
eedback Equalizer) is used.

This DFE equalizer is constructed as shown in FIG. The DFE equalizer 1 has a feedforward unit (hereinafter referred to as an FF unit) 2 and a feedback unit (hereinafter referred to as an FB unit) 3. FF section 2,
The FB unit 3 is a transversal filter (comb filter).
It is composed.

The input signal is processed by the FF section 2 and the FB section 3 is processed.
Is added by the adder 4 to perform equalization processing, and the detector 5 determines data and outputs the equalized output. As a pre-stage of actual signal equalization, DFE
The equalizer 1 first selects optimum tap coefficients for the FF section and the FB section during the training period.

In the training period, the algorithm unit 6
The switch provided on the input side of the learning sequence circuit 7
, And the reference signal is sent from the learning sequence circuit 7 to the algorithm unit 6. Algorithm part 6
Updates the tap coefficients of the FF unit 2 and the FB unit 3 so that the error between the reference signal and the output of the adder 4 becomes small, that is, the mean square error becomes minimum.

In practice, the algorithm unit 6 uses the least mean square (LMS) algorithm, the recursive least mean square (RLS) algorithm, etc. as the successive update algorithm based on the minimum mean square error (MMSE) standard. To use. Algorithm part 6
In the above, the tap coefficient is converged within the training period by sequentially repeating the above calculation for the reference signal from the algorithm section and the output of the known symbol from the adder.

During another period of subsequent transmission, the switch is connected to the output side of the detector 5, and the signal corresponding to the demodulation output is supplied to the algorithm unit 6 as a reference signal. Then, the tap coefficient is continuously updated so that the average error power between the reference signal and the output of the adder 4 is minimized.

As a communication system using the DFE equalizer 1 as shown in FIG. 17, for example, Japanese Patent Laid-Open No. 6-318895.
There is one described in the publication. In the communication system described in this publication, the algorithm for obtaining the above-mentioned optimum tap coefficient is obtained only by one of the transmitting / receiving devices communicating with each other.

That is, one transmitting / receiving device performs adaptive equalization processing by the DFE equalizer 1 using the obtained optimum tap coefficient (hereinafter referred to as equalization rate), and at the same time, the equalization rate is transmitted / received to / from the communication partner. Send to device. As a result, in the transmission / reception device of the communication partner, the algorithm unit 6 and the detector 5 can be omitted by performing the equalization processing by the feedforward type filter and the feedback type filter using the equalization rate sent. The configuration can be simplified.

This is based on the fact that the transmission / reception devices communicating with each other are transmitting under the common transmission path environment, and therefore the state of the wireless transmission path is also the same.

[0012]

By the way, since different frequencies have different fading due to each frequency even under the same radio transmission path environment, only one of the above-mentioned transmitting and receiving apparatuses which are communicating with each other is used. The equalization rate is calculated and can be shared by the other transmission / reception device as well.
The communication system using the ision Duplex) method is general.

Considering one transmitting / receiving device communicating with each other as a radio base station and the other transmitting / receiving device as a mobile terminal device, in a communication system using the TDD system, the moving speed of the mobile terminal device is When the channel frequency is fast or when the carrier frequency to be transmitted is high, the channel state changes rapidly.

As a result, if the equalization ratio obtained by one transmitting / receiving device is to be used by the other transmitting / receiving device, the equalizing ratio may not actually be the optimum value for the other transmitting / receiving device. As a result, the reception quality at the transmitter / receiver that does not have the algorithm part deteriorates.

Further, in order to transmit the equalization rate obtained by the first transmission / reception apparatus to the second transmission / reception apparatus, the second transmission / reception apparatus needs to know the current equalization rate in order to receive the equalization rate. There is. However, since the second transmission / reception device does not have an algorithm unit for obtaining the equalization rate, this cannot be obtained.
Therefore, there is a contradiction that the second transmission / reception device cannot correctly receive the equalization rate from the first transmission / reception device.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a transmitting / receiving apparatus, a wireless communication system, and a transmitting / receiving method having a simple structure capable of solving the above problems all at once.

[0017]

In order to solve such a problem, a transmitting / receiving apparatus of the present invention applies a received signal equalization means for equalizing a received signal and a part of the equalization processing to a transmitted signal. A configuration including transmission signal equalization means is adopted.

According to this structure, the transmission signal transmitted by being subjected to a part of the equalization processing by the transmission signal equalization means is received by the radio station of the communication partner and subjected to the remaining equalization processing. The final received signal is obtained. As a result, the configuration of the wireless station of the communication partner can be simplified by the amount of partial equalization processing performed by the transmitting / receiving apparatus of the present invention. Also, for example, TDD
Considering the case of wireless communication by the method, by leaving a part of the equalization processing to the communication partner, the equalization characteristics of the transmission signal equalization means are adapted to the state of the reception signal and all the equalization processing is performed. Compared with the case where the equalization processing part of the wireless station of the communication partner is omitted and the equalization rate calculation part of the wireless station of the communication partner is omitted and the equalization rate is transmitted, Even if there is a slight change in the transmission path during the period, it is possible to perform equalization processing that follows the change in the transmission path. Thus, it is possible to realize a transmitting / receiving device that can simplify the configuration of the communication partner without degrading the reception quality of the communication partner.

Further, the transmitting / receiving apparatus of the present invention further comprises a delay profile creating means for creating a delay profile of the received signal, and a tap delay amount of the received signal equalizing means and the transmitting signal equalizing means based on the peak appearing in the delay profile. A tap delay amount calculating means for obtaining the tap delay amount, and an algorithm executing means for obtaining the optimum tap coefficient of the reception signal equalizing means and the transmission signal equalizing means set to the tap delay amount calculated by the tap delay amount calculating means. Take the composition.

According to this configuration, since the tap delay amount is set based on the peak appearing in the delay profile,
It is possible to perform the equalization processing that is narrowed down to the main wave and the delayed wave that are substantially the target of the equalization processing. As a result, the amount of calculation processing for calculating the optimum tap coefficient by the algorithm executing means can be reduced, and the amount of equalization processing of the reception signal equalization means and the transmission signal equalization means can be reduced.

The transmitting / receiving apparatus of the present invention further comprises a plurality of antennas, a plurality of reception signal equalization means for equalizing the reception signals of the respective antennas, and an equalization processing for the transmission signals transmitted from the respective antennas. A plurality of transmission signal equalization means, a delay profile creation means for creating a delay profile of each antenna reception signal, and a tap delay of the reception signal equalization means and the transmission signal equalization means based on the peak appearing in the delay profile. A tap delay amount calculating means for obtaining the amount, and an algorithm executing means for obtaining the optimum tap coefficient of the reception signal equalizing means and the transmission signal equalizing means set to the tap delay amount calculated by the tap delay amount calculating means. Adopt a configuration that does.

According to this structure, a part of the equalization processing to be performed by the receiving section of the radio station of the communication partner is performed by a plurality of transmission signal equalization means, so that the reception quality of the communication partner is not deteriorated. In addition, it is possible to realize a transmission / reception device capable of performing transmission diversity by simplifying the configuration of the communication partner.

Further, in the transmitting / receiving apparatus of the present invention, the tap delay amount calculating means includes a plurality of reception signal equalizing means and a plurality of transmission signals based on a combined delay profile obtained by combining a plurality of delay profiles for each antenna reception signal. A common tap delay amount is obtained for the conversion means.

According to this structure, the common tap delay amount is obtained by using the combined delay profile, and this is used as the tap delay amount of the reception signal equalization means and the transmission signal equalization means. Even if the signal level is not sufficient compared to the noise level, the tap delay amount of the reception signal equalization means and the transmission signal equalization means can be set relatively accurately corresponding to each antenna, so that reception for a certain antenna can be performed. It is possible to prevent the precision of the signal equalization processing and the transmission signal equalization processing from being extremely lowered.

Further, in the transmitting / receiving apparatus of the present invention, the tap delay amount calculating means is based on a plurality of delay profiles for each antenna reception signal created by the delay profile creating means, and each reception signal equalizing means and transmission signal equalizing means are provided. The configuration is such that an independent tap delay amount is obtained for each means.

According to this configuration, since the tap delay amount is set in each of the reception signal equalization means and the transmission signal equalization means based on the optimum path of the corresponding antenna reception signal, the calculation amount in the algorithm execution means is large. And the amount of equalization processing in each equalizing means is reduced.

Further, the transmitting / receiving apparatus of the present invention comprises an equalization error calculating means for obtaining an equalization error of each of a plurality of reception signal equalization means and an antenna corresponding to the reception signal equalization means having an equalization error of a predetermined value or more. And a transmission control means for controlling the stop of the transmission of.

According to this configuration, when the path is received by an antenna having a path exceeding the maximum delay amount of the assumed path and the equalization capability of the received signal equalization means is exceeded, the equalization error calculation means determines a predetermined value. An equalization error equal to or greater than the value is obtained, and the transmission control means stops transmission from that antenna. As a result, it is possible to prevent a path outside the expected range from being received by the antenna of the wireless station of the communication partner,
Unnecessary optimum tap coefficient calculation processing that can improve reception quality at the wireless station of the communication partner (that is, optimum tap coefficient calculation for a signal for which equalization error becomes larger than the allowable value even if equalization processing is performed Processing) can be reduced.

Also, in the transmitting / receiving apparatus of the present invention, the received signal equalizing means is a decision feedback equalizer having a feedforward type filter section and a feedback type filter section,
The transmission signal equalizing means has the same configuration as the feedforward type filter of the reception signal equalizing means.

According to this structure, if the filter characteristic of the feedforward type filter of the transmission signal equalizing means, that is, the tap delay amount and the tap coefficient are set in the same manner as the feedforward type filter of the reception signal equalizing means, the received signal is obtained. By using the filter characteristic calculated by the equalizing means as it is, it is possible to form a transmitting signal equalizing means capable of favorably performing a part of the equalizing process of the transmitting signal according to the transmission path characteristic. As a result, the structure of the transmission signal equalization unit can be simplified by not having to separately receive the algorithm unit as the transmission signal equalization unit.

The wireless communication system of the present invention is a wireless communication system including first and second transmitting / receiving devices that communicate with each other in a time division duplex system, and a received signal equalizing means for equalizing a received signal. And a transmission signal equalization unit that performs a part of equalization processing on the transmission signal using the equalization characteristic obtained by the reception signal equalization unit, and a first transmission / reception device And a second transmission / reception device having received signal equalization means for performing the remaining equalization processing on the signal which has been subjected to a part of the equalization processing received from.

According to this configuration, the first transmitting / receiving device is
A signal transmitted from the second transmission / reception device is received in a certain time slot, and the received signal is equalized by the received signal equalizing means to obtain the equalized received signal. The first transmission / reception device performs a part of equalization processing on the transmission signal by the transmission signal equalization means in the next time slot and transmits the transmission signal. This signal is received by the second transmission / reception device and subjected to the remaining equalization processing. As a result, the configuration of the second transmission / reception device can be simplified by the amount of the equalization processing performed by the first transmission / reception device. In addition, the first transmitter / receiver performs only a part of the equalization processing on the transmission signal and the second transmitter / receiver performs the remaining equalization processing. In other words, the equalization processing is performed by the first transmitter / receiver. Since the transmission / reception device and the second transmission / reception device share the same, even if there is a slight change in the transmission line from the reception to the transmission of the first transmission / reception device, the transmission line fluctuation is tracked. Can be processed. Thus, it is possible to realize a wireless communication system that can simplify the configuration of the second transmission / reception device without deteriorating the reception quality of the second transmission / reception device.

Further, in the wireless communication system of the present invention, the transmission signal equalization means provided in the first transmission / reception device is a feedforward type filter, and the reception signal equalization means provided in the second transmission / reception device is a feedback. A type filter is used, and a decision feedback equalizer is formed by the transmission signal equalization means and the reception signal equalization means.

According to this configuration, since the decision feedback equalizer having the wireless transmission line interposed is formed between the transmission unit of the first transmission / reception device and the reception unit of the second transmission / reception device, the wireless transmission line is formed. Even if fluctuates, it is possible to follow this well and perform equalization processing.

Further, in the wireless communication system of the present invention, the first and / or second transmitting / receiving device comprises a moving speed detecting means for detecting a relative moving speed between the devices, and the second transmitting / receiving device is a relative device. A configuration is adopted in which the number of transmissions of known symbols to the first transmitting / receiving device is changed according to the moving speed.

According to this structure, when the relative moving speed of the first transmitting / receiving device and the second transmitting / receiving device is high, the radio propagation environment between the first transmitting / receiving device and the second transmitting / receiving device can be shortened in a short time. Since it is considered that there is a large variation, the number of times of transmission of the known symbol transmitted from the second transmitting / receiving device to the first transmitting / receiving device is increased. As a result, the first transmission / reception device, based on the known symbols that arrive at short intervals,
Equalization processing can be performed while sequentially changing the equalization characteristics according to the radio propagation environment that changes instantaneously.

Further, in the wireless communication system of the present invention, the first and / or second transmitting / receiving apparatus comprises a delay spread detecting means for detecting the delay spread of the received signal, and the smaller the spread of the delay spread is, the closer to the other side. The number of known symbols to be transmitted is reduced, and when the number of known symbols is reduced, a parity pattern corresponding to the reduced number of known symbols is inserted into a transmission frame and transmitted.

According to this structure, since the parity pattern can be transmitted without transmitting useless known symbols, it is possible to realize a transmitter / receiver with further improved reception performance.

Further, in the wireless communication system of the present invention, the first and / or second transmitting / receiving apparatus superimposes a transmission signal on a plurality of carrier waves for transmission, and one carrier wave is a known symbol for equalization rate setting. The configuration used as a carrier wave dedicated to transmission is adopted.

According to this structure, the equalization means can estimate the equalization rate and normal data transmission in the same time, so that channel occupancy for estimating the equalization rate is eliminated and the substantial communication capacity is reduced. Can be increased. Further, since the known symbol is transmitted by the dedicated carrier wave, it is possible to avoid the interference between the normal transmission data and the known symbol.

The wireless communication system of the present invention has a configuration in which the first transmitting / receiving device is provided in the wireless base station and the second transmitting / receiving device is provided in the wireless terminal station.

With this structure, it is possible to realize a wireless terminal station having a simple structure without deteriorating the reception quality. Thus, if the present invention is applied to a portable wireless terminal station such as a mobile phone or a portable information terminal, a small wireless terminal station that is convenient to carry can be obtained.

Further, in the transmission / reception method of the present invention, the first transmission / reception apparatus transmits a transmission signal subjected to a part of equalization processing,
The second transmission / reception device that receives the transmission signal performs the remaining equalization processing to obtain the reception signal.

According to this method, the structure of the second transmission / reception device can be simplified by a part of the equalization processing performed by the first transmission / reception device. In addition, the first transmitter / receiver performs only a part of the equalization processing on the transmission signal and the second transmitter / receiver performs the remaining equalization processing. In other words, the equalization processing is performed by the first transmitter / receiver. Since the transmission / reception device and the second transmission / reception device share the same, even if there is a slight change in the transmission line from the reception to the transmission of the first transmission / reception device, the transmission line fluctuation is tracked. Can be processed. Thus, the configuration of the second transceiver can be simplified without degrading the reception quality of the second transceiver.

[0045]

BEST MODE FOR CARRYING OUT THE INVENTION The essence of the present invention is that, of the first and second transmission / reception devices that communicate with each other, an equalization processing unit is provided in the reception unit of the first transmission / reception device, and The transmission unit is provided with an equalization processing unit that performs a part of the equalization processing on the transmission signal in advance by using the equalization ratio obtained by the equalization processing unit, and the equalization processing is performed in the reception unit of the second transmission / reception device. That is, the received signal is obtained by performing the remaining processing of.

Thus, in the present invention, since the transmitter of the first transmitter / receiver is provided with a part of the equalization processing function of the second transmitter / receiver, the configuration of the second transmitter / receiver can be simplified accordingly. Can be converted. Further, since the reception unit of the second transmission / reception device also shares a part of the equalization process, even if the transmission path environment changes suddenly, the reception unit of the second transmission / reception device can perform the equalization process corresponding thereto. As a result, the reception quality of the second transmitter / receiver can be improved.

Thus, for example, if the first transmitting / receiving device is provided in the wireless base station and the second transmitting / receiving device is provided in the wireless portable device such as a mobile phone, a small portable wireless device with good reception quality is realized. can do.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1) In FIG. 1, reference numeral 100 generally indicates the configuration of a radio base station apparatus according to Embodiment 1 of the present invention. The wireless base station device 100 has an antenna 101.
The received signal received in (1) is subjected to predetermined wireless reception processing such as down conversion and analog-digital conversion processing by a wireless reception unit (RF) 102, and then input to a decision feedback (DFE) equalizer 103.

The DFE equalizer 103 has a feedforward section (hereinafter referred to as FF section) 104 and a feedback section (hereinafter referred to as FB section) 105. F
The F section 104 and the FB section 105 have a transversal filter (comb filter) configuration. In FIG. 1, the FF unit 104 and the FB unit 105 are both shown to simplify the description.
Although shown by taps, in actuality, any tap length can be selected.

The received signal is processed by the FF unit 104 and FB
The outputs of the unit 105 are added by the adder 106 and then sent to the algorithm unit 108 and the determiner 107. The determiner 107 determines the symbol of the received signal similarly to the data determiner of a normal demodulator, and determines the determination value by the algorithm unit 108.
Send to.

Here, in the DFE equalizer 103, there is a training period in which the optimum tap coefficient is first set based on known data such as a unique word, with the equalization of the received signal as the previous stage. During this training period, the algorithm unit 108 uses the reference signal (known data) and the determiner 107.
The tap coefficients of the FF unit 104 and the FB unit 105 are updated so that the error from the determination value of 1 is minimized.

In practice, the algorithm unit 108 uses the Least Mean Square (LMS) algorithm, the Recursive Least Mean Square (RLS) algorithm, etc. as the successive update algorithm based on the minimum mean square error (MMSE) criterion. To use. The algorithm unit 108 converges the tap coefficient within the training period by sequentially repeating this calculation.

In the period in which the actual received signal is input, the algorithm unit 108 reduces the error between the addition signal output from the adder 106 and the determination value output from the determination unit 107, that is, I- The tap coefficients of the FF unit 104 and the FB unit 105 are changed so that the symbol position on the Q plane is located at the center between the determination thresholds. In this way, the algorithm unit 108 has the FF unit 104 and the F unit 104.
By appropriately changing the tap coefficient of the B section 105, the received symbol that has undergone channel fluctuation is returned to a predetermined signal point position.

In addition to the above configuration, the radio base station device 10
The transmission unit of 0 is a transmission feedforward unit (FF unit)
110 is provided. The FF section 110 includes a modulation section 11
The transmission data and the known data that have been subjected to the modulation processing by 1 are input. Here, the algorithm unit 108 uses the filter characteristic calculated by the above-described algorithm at the time of reception as the filter characteristic of the FF unit 110, and the DFE equalizer 10
With respect to the filter characteristic of the FF unit 104 of 3, the phase characteristic is set to be the same and the time characteristic is set to the opposite characteristic. Specifically, the same value is set as the tap coefficient, while a value having an inverse characteristic is set as the tap delay amount.

The transmission signal filtered by the FF unit 110 is subjected to a predetermined wireless transmission process such as digital-analog conversion process or up-conversion by a wireless transmission unit (RF unit) 112, and then transmitted from the antenna 101.

Next, FIG. 2 shows the radio base station apparatus 100 of FIG.
3 shows a configuration of a wireless terminal device 200 that wirelessly communicates with The wireless terminal device 200 receives a signal transmitted from the wireless base station device 100 via the antenna 201 and receives a signal from the wireless reception unit (RF unit).
Input to 202. The wireless reception unit 202 performs predetermined wireless reception processing such as down conversion and analog-digital conversion processing on the received signal, and then supplies the processed signal to the adder 203.

The adder 203 adds the received signal and the signal filtered by the feedback unit (FB unit) 204, sends the added signal directly to the algorithm unit 205, and sends the added signal directly to the algorithm unit 205 via the decision unit 206.
Send to.

The decision unit 206 decides the symbol of the received signal similarly to the data decision unit of a normal demodulator, and sends the decision value to the algorithm unit 205. Algorithm unit 205
Is the same as the algorithm unit 108 (FIG. 1) described above.
The optimum tap coefficient of the unit 204 is calculated, and the calculated value is used as the FB unit 2
The tap coefficient of 04 is sequentially changed.

The transmitting section of the wireless terminal device 200 digitally modulates the transmission data and the known data by the modulating section 210, and the signal after the modulation processing is wirelessly transmitting section (RF) 211.
And transmit via the antenna 201.

In the above configuration, the radio base station apparatus 10
0 and the wireless terminal device 200 communicate with each other by the TDD method. First, known data is transmitted from the wireless terminal device 200. The wireless base station device 100 receives the known data,
Input to the E equalizer 103.

In the DFE equalizer 103, the algorithm unit 108 operates the FF unit 104 and the FB unit 1 based on this known data.
The optimum tap coefficient of 05 is obtained, and this optimum tap coefficient is F
It is set as a tap coefficient for the F unit 104 and the FB unit 105. In addition, the algorithm unit 108 sets the tap coefficient and the tap delay amount of the FF unit 110 so that the phase characteristic is the same as the filter characteristic set by the FF unit 104 but the time characteristic is opposite.

Next, the wireless base station device 100 transmits known data to the wireless terminal device 200. This known data is transmitted as a signal that has been filtered by the FF unit 110.

Here, when the transmission and reception intervals of the wireless terminal device 200 and the wireless base station device 100 are very short, the fading state occurring between the antennas 101 and 102 and the arrival time of each multipath are Base station device 1
It is considered that the reception of 00 and the reception of the wireless terminal device 200 are the same.

In this embodiment, in consideration of this, the FF section 110 conventionally arranged at the receiving end of the wireless terminal device.
Was provided in the transmission unit of the wireless base station device 100, and the tap coefficient thereof was selected according to the equalization rate obtained at the time of reception. As a result, in the wireless terminal device 200, the F
Similar to the case where the F section and the FB section are provided, good reception characteristics can be obtained.

The wireless terminal device 200 is the wireless base station device 10.
When the signal from 0 is received, the equalization rate in the FB unit 204 is selected based on the known data of the signal. At this time, in the wireless terminal device 200, the FF unit 110 of the wireless base station device 100 receives the signal that has already undergone a part of the equalization process, and therefore only the tap coefficient of the FB unit 204 needs to be calculated by the algorithm unit 205. Good.

As described above, in the communication system including the radio base station apparatus 100 and the radio terminal apparatus 200, the feed-forward type filter of the decision feedback equalizer is provided in the transmission section of the radio base station apparatus 100, and the feedback type filter and the algorithm are used. The unit is provided in the receiving unit of the wireless terminal device 200.

Here, when communication is performed by the TDD method, the fading state generated between the antennas 101 and 201 slightly varies depending on the moving speed of the wireless terminal device 200, but the arrival time of each multipath is different. Since the fluctuation can be ignored, the filtering coefficient (tap coefficient) of the FB unit 204 may be updated so as to absorb the amplitude fluctuation due to some fading. As a result, in the wireless terminal device 200, the algorithm for converging the tap coefficient can be performed in a short time, and thus excellent reception performance can be obtained.

According to the above configuration, the wireless terminal device 200
Since the FF unit 110 of the DEF equalizer is omitted and is provided in the transmission unit of the wireless base station device 100, the reception quality of the wireless terminal device 200 is equivalent to that when the DFE equalization process is performed. The wireless terminal device 2 while maintaining the quality
The configuration of 00 can be simplified. As a result, it is possible to realize the small wireless terminal device 200 having excellent reception quality.

Further, by transmitting the optimum tap coefficient obtained by the radio base station apparatus 100 to the radio terminal apparatus 200, the transmission channel environment can be improved as compared with the case where the optimum tap coefficient calculation processing in the radio terminal apparatus 200 is omitted. Since the FB unit 204 can perform equalization processing even when there is a sudden change,
It is possible to suppress deterioration of reception quality.

Furthermore, even when the arrival time of the main wave at the receiving section of the wireless terminal device 200 is not accurate, the wireless terminal device 2
00 itself is the base station device 10
Although the transmission signal is transmitted to 0, the error of the arrival time of the main wave can be adjusted by the FF unit 110 of the wireless base station device 100. As a result, the radio terminal apparatus 200 does not need to perform highly accurate main-wave time identification processing, so that it is possible to reduce the number of frame synchronization and symbol synchronization circuits for performing identification processing. Therefore, the wireless terminal device 200
The configuration of can be further simplified.

(Second Embodiment) In FIG. 3, in which parts corresponding to those in FIG.
3 shows a configuration of a wireless base station device according to a second embodiment. The wireless base station device 300 has the same configuration as the wireless base station device 100 of FIG. 1 except that the wireless base station device 300 has a delay profile creation unit 301 and the processing by the algorithm unit 303 is different.

The delay profile creating section 301 is composed of a matched filter, and correlates the known signal portion included in the received signal output from the radio receiving section 102 and the known data held in advance at each time point. A delay profile is created by finding

The delay profile creating circuit 301 creates a delay profile averaged over a plurality of frames and an instantaneous delay profile for a transmission frame. Then, as shown in FIG. 4B, the main wave arrival time t0 of the received signal is calculated from the averaged delay profile.

The arrival time t0 of the main wave can be regarded as the leading timing of each multipath wave in the received signal. In addition, the instantaneous delay profile is shown in FIG.
As shown in, the multipath is observed at time t1 and time t2. In such a delay profile, it suffices to focus only on the times t1 and t2.

Therefore, the tap delay amount calculation unit 302 calculates the delay time of the delay elements of the FF unit 104 and the FB unit 105 based on the peak of the delay profile (t1-t).
0) and (t2-t0) are calculated and sent to the algorithm unit 303. The algorithm unit 303 is the FF unit 10.
4, the delay time of the delay element of the FB unit 105 is (t
1-t0) and (t2-t0).

According to the above configuration, in addition to the configuration of the first embodiment, the delay profile creating section 301 is provided, and the FF section 104 and the FB section are based on the created delay profile.
By setting the delay time of the delay element of the unit 105 and performing only the equalization processing of the time actually required,
Since only the filter coefficient (tap coefficient) actually required by the algorithm unit 303 needs to be obtained and only the filter processing at the time actually required can be performed, unnecessary calculation by the algorithm unit 303 can be performed. It can be omitted. As a result, the configuration of the algorithm unit 303 can be simplified.

(Embodiment 3) In this embodiment, the case where the present invention is applied to a system in which a radio base station apparatus has a plurality of antennas will be described. FIG. 5 shows the configuration of radio base station apparatus 500 according to Embodiment 3.

Radio base station apparatus 500 has a number of DFE equalizers 501 and 502 corresponding to the number of antennas. Here, since the configurations of the DFE equalizers 501 and 502 are the same as those of the DFE equalizer 103 (FIG. 1) described above in the first embodiment, the portions corresponding to those in FIG. Indicate.
However, the corresponding part in the DFE equalizer 501 is represented by adding A after the code, and the corresponding part in the DFE equalizer 502 is represented by adding B after the code.

Radio base station apparatus 500 includes antenna 510,
The signals received at 511 are received by the radio receiver (RF) 5 respectively.
12, 513 via the delay profile creation unit 514,
515. Each delay profile creation unit 514,
515 creates a delay profile for each input signal. Delay profile creation units 514 and 51
The output of No. 5 is combined by the adder 516 and then sent to the tap delay amount calculation unit 517.

The tap delay amount calculator 517 calculates the tap delay amount common to the two DFE equalizers 501 and 502 from each delay profile. Then, the calculated tap delay amount is set to the algorithm unit 1 of each DFE equalizer 501, 502.
08. The algorithm unit 108 determines the delay amount of each delay element of the FF unit 104 and the FB unit 105 of the DFE equalizers 501 and 502 by the tap delay amount calculation unit 517 as in the second embodiment. Set to. Further, the algorithm unit 108 performs the process of calculating the optimum tap coefficient using the known data as in the first embodiment.

The received signals equalized by the DFE equalizers 501 and 502 are sent to the reception quality comparison section 518 and the selection section 519, respectively. The reception quality comparison unit 518 is provided for SIR (Signal to Interference Ratio) and C of each demodulated signal.
Based on RC (Cyclic Redundancy Check), the selection unit 519 selects the comparison result signal representing the received signal with the better reception quality.
Send to.

The selection unit 519, based on the comparison result signal,
The reception demodulation signal having the better reception quality of the two reception demodulation signals is selectively output. As a result, the wireless base station device 500
Then, the reception diversity effect can be obtained.

The transmission section of the radio base station apparatus 500 performs the same modulation processing on the transmission data and known data as each modulation section 52.
0 to 521. The signal after the modulation processing is filtered by the transmission FF units 522 and 523, and then the antenna 510, through the wireless transmission units (RF) 524 and 525.
Sent from 511.

Here, the tap coefficient of each multiplication circuit of the transmission FF unit 522 is set to the FF of the reception unit by the algorithm unit 108A.
The value is set to the same value as that of the unit 104A, and the tap coefficient of each multiplication circuit of the transmission FF unit 523 is set to the algorithm unit 10.
8B sets the same value as that of the FF unit 104B of the receiving unit. Further, the tap delay amount of each delay element of the transmission FF unit 522 is determined by the algorithm unit 108A as the FF unit 10 of the reception unit.
4A, and the tap delay amount of each delay element of the transmission FF unit 523 is set to a value that has an inverse characteristic of 4 A.
08B sets a value that has an opposite characteristic to that of the FF unit 104B of the receiving unit.

Next, the tap coefficient calculation processing operation by radio base station apparatus 500 will be explained using FIG. First, in step ST1, the delay profile creation units 514, 51
5 obtains a delay profile for a received signal received by a plurality of antennas 510 and 511. Next, in step ST2, the delay profiles are combined by the adder 516.

Next, in step ST3, the tap delay amount calculation unit 517 obtains a common tap delay amount between the antennas 510 and 511 from the combined delay profile. Then, in the subsequent step ST4, the algorithm units 108A and 108B cause the FF units 104A and 104B and the FB units 105A and 105B of the DFE equalizers 501 and 502.
The delay amount of each delay element is set to the delay amount calculated by the tap delay amount calculation unit 517, and the optimum tap coefficient is calculated using known data.

According to the above configuration, the plurality of antennas 51
A delay profile is created for each of the received signals of 0 and 511, and the DFE equalizer 50 corresponding to each antenna 510 and 511 is created based on the delay profile.
After setting the common tap delay amount for 1 and 502,
The DFE equalizers 501 and 502 find the optimum tap coefficient and select the signal of higher quality among the signals equalized by the DFE equalizers 501 and 502. It is possible to reduce the calculation amount of and to obtain the reception diversity effect.

As a result, it is possible to realize radio base station apparatus 500 capable of equalizing the received signal with a simple structure and improving the reception quality.

By combining the delay profiles created on the basis of the received signals from the respective antennas 510 and 511, it is effective when the received signal level is not sufficient compared with the noise level.

(Embodiment 4) Referring to FIG. 7 in which parts corresponding to those in FIG. 5 are assigned the same reference numerals, radio base station apparatus 700 of this embodiment has tap delays of DFE equalizers 501 and 502. The configuration is the same as that of the radio base station apparatus 500 according to the third embodiment except that the amounts are set independently.

In other words, radio base station apparatus 700 uses tap delay amount calculation section 701, based on the delay profiles created by delay profile creation sections 514 and 515, respectively.
702 calculates an independent tap delay amount for each antenna branch.

The algorithm units 108A and 108B have F
The tap delay amounts of the F units 104A and 104B, the FB units 105A and 105B, and the transmission FF units 522 and 523 are set to the tap delay amounts calculated by the corresponding tap delay amount calculation units 701 and 702. Next, the algorithm unit 108
A and 108B perform the process of calculating the optimum tap coefficient based on the known data, as in the first embodiment, so that the FF unit 1
The optimum tap coefficients of 04A, 104B, FB units 105A, 105B, and transmission FF units 522, 523 are obtained.

The tap coefficient calculation processing operation by radio base station apparatus 700 will be described with reference to FIG. First step S
At T11, the delay profile creation units 514 and 515
Calculates a delay profile for a received signal received by a plurality of antennas 510 and 511. Next, in step ST12, the tap delay amount calculation section 701, 702 obtains the tap delay amount independent of each antenna based on the corresponding delay profile.

Then, in the subsequent step ST13, the algorithm units 108A and 108B are operated by the DFE equalizer 50.
FF units 104A, 104B and FB unit 105
The delay amounts of the delay elements A and 105B are set to the delay amounts calculated by the tap delay amount calculation units 701 and 702, and the optimum tap coefficient is calculated using known data.

According to the above configuration, the plurality of antennas 51
A delay profile is created for each of the received signals of 0 and 511, and the DFE equalizer 50 corresponding to each antenna 510 and 511 is created based on the delay profile.
After setting the independent tap delay amount for 1 and 502,
The DFE equalizers 501 and 502 find the optimum tap coefficient and select the signal of higher quality among the signals equalized by the DFE equalizers 501 and 502. It is possible to reduce the calculation amount of and to obtain the reception diversity effect.

As a result, it is possible to realize radio base station apparatus 700 capable of equalizing the received signal with a simple structure and improving the reception quality.

Further, as compared with the third embodiment, only the optimum path can be handled for each antenna branch signal.
The time required for the algorithm units 108A and 108B to calculate the optimum tap coefficient can be further shortened. Further, since the tap delay amount of each transmission FF unit 522, 523 is set to a value corresponding to the optimum path, the calculation amount for obtaining the optimum tap coefficient in the algorithm unit in the wireless terminal device of the communication partner can be further reduced.

(Embodiment 5) In FIG. 9 in which parts corresponding to those in FIG. 7 are assigned the same reference numerals, 900 indicates the configuration of the radio base station apparatus according to Embodiment 5 as a whole. The radio base station apparatus 900 has an equalization error level calculation unit 901 that calculates the equalization error levels of the DFE equalizers 501 and 502 provided corresponding to the antennas 510 and 511.

The equalization error level calculation section 901 calculates the equalization error by the DFE equalizers 501 and 502. In practice, the equalization error level calculation unit 901 determines that each DFE equalizer 50
An equalization error level is calculated by comparing the signal after the equalization processing of the known symbols such as pilot symbols and unique words 1 and 502 with the known symbols.

The equalization error level calculation unit 901 sends the obtained equalization error level to the selection unit 902 and the transmission control unit 903. The selection unit 902 selectively outputs the equalized signal with the smaller equalization error level. As a result, the reception diversity effect can be obtained.

The transmission control unit 903 compares the equalization error level of each antenna branch with a prescribed value. Then, the transmission of the antenna branch whose equalization error level exceeds the specified value is stopped. That is, the transmission signal is transmitted only from the antenna branch having excellent equalization ability.

For example, when the equalization error level by the DFE equalizer 501 exceeds the specified value, the transmission control section 903.
Turns off the switch 904 and the antenna 5
Stop transmission from 10.

Incidentally, when the equalization error levels of both the DFE equalizer 501 and the DFE equalizer 502 both exceed the specified value, the transmission control unit 903 corresponds to the antenna branch having a small equalization error level. Switch 904 or 90
Even if both equalization error levels exceed the specified values by controlling ON of 5, the transmission signal can be output from at least one antenna branch.

In the above configuration, the radio base station device 90
0 sequentially performs the processing shown in FIG. 10 to perform equalization processing and transmission operation for each antenna branch signal. In the wireless base station device 900, first, in step ST21, the delay profile creation units 514 and 515 are configured so that the antenna 51
The delay profile for the received signal received by 0, 511 is obtained. Next, in step ST22, the tap delay amount calculation units 701 and 702 obtain independent tap delay amounts for each antenna branch based on the corresponding delay profiles.

Then, in the following step ST23, the algorithm units 108A and 108B cause the DFE equalizer 50 to
FF units 104A, 104B and FB unit 105
The delay amounts of the delay elements A and 105B are set to the delay amounts calculated by the tap delay amount calculation units 701 and 702, and the optimum tap coefficient is calculated using known data.

In step ST24, the equalization error level calculation section 901 calculates the equalization error level in the known symbol section, the selection section 902 selects and outputs the antenna branch signal having the smaller equalization error level, and the transmission control is performed. Unit 903 selects an antenna branch whose equalization error level satisfies a specified value as a transmission antenna.

Therefore, in the radio base station apparatus 900, when a path exceeding the maximum delay amount of the assumed path is received by the antenna 510 or 511, the transmission of the antenna 510 or 511 is performed. Stop.
This makes it possible to avoid reception of a path outside the expected range at the communication terminal device. As a result, it is possible to improve the reception quality at the radio station of the transmission partner of the radio base station apparatus 900, and unnecessary unnecessary tap coefficient calculation processing (that is, equalization error becomes larger than the allowable value even if equalization processing is performed. Optimal tap coefficient calculation process for such signals)
Can be reduced.

According to the above configuration, by transmitting only the antenna signal for which a sufficient effect is actually obtained by the equalization processing, in addition to the effect obtained in the fourth embodiment, the radio wave of the transmission partner can be obtained. A radio base station apparatus 900 capable of reducing the amount of equalization calculation in a station can be realized.

(Embodiment 6) In the following embodiments, the structure of time slots during TDD communication by the transceiver of the present invention will be described. In Figure 11,
16 shows a time slot configuration according to the sixth embodiment of the present invention. In FIG. 11, the uplink slot and the downlink slot are called because, as transmitting and receiving devices communicating with each other, one is assumed to be a radio base station and the other is assumed to be a communication terminal.

In this embodiment, it is proposed to freely change the upstream and downstream slot configurations within the allocated slot time range. By this means, it is possible to increase the amount of uplink data when the amount of data transmitted from the wireless terminal device is large, and to increase the amount of downlink data when the amount of data is small. That is, the uplink and downlink communication capacities can be made variable.

Incidentally, as in the above-described first to fifth embodiments, one transmission / reception apparatus estimates the equalization rate based on the signal from the other transmission / reception apparatus, and the estimated equalization rate is used. In a communication system in which a part of equalization processing is performed at the time of transmission and a signal is transmitted to the other transmission / reception device, communication is performed by changing the equalization rate according to a transmission path shared by only two transmission / reception devices. Since the communication is closed only between two transmitting / receiving devices, there is no problem even if the slot configuration is freely changed between the two transmitting / receiving devices.

Here, in a commonly used adaptive equalizer such as a DFE equalizer or an MLSE equalizer, known data such as a unique word (UW) is used when calculating the equalization rate. Further, guard time 1 is set in order to absorb the time lag between the uphill and the downhill. Furthermore, a guard time 2 is set in order to absorb the time lag between each transmitting / receiving device.

As in the above-described first to fifth embodiments, when part or all of the equalization processing is performed on the transmission signal and the signal is transmitted, the transmission path environment between the communication is reduced. Since it is important to repeat communication with little change,
It is desirable that the time of the upstream slot and the time of the downstream slot are close to each other.

In this embodiment, by freely changing the slot configuration within the allocated slot time, the guard time 1 and the guard time 2 can be set to desired times. As a result, it is possible to perform equalization processing that is more suitable for the transmission path environment, and it is possible to obtain a transmitting / receiving device with even better reception performance.

As described above, according to this embodiment, in the first and second transmission / reception devices that perform TDD communication with each other, the communication between the first transmission / reception device and the second transmission / reception device within the assigned slot time is performed. By changing the capacity ratio, in addition to the effect of the first embodiment, it is possible to increase the communication capacity, and it is possible to realize a transmitter / receiver having further excellent reception performance.

(Embodiment 7) In FIG. 12 in which parts corresponding to those in FIG. 2 are assigned the same reference numerals, reference numeral 1200 generally indicates the configuration of a radio terminal apparatus according to Embodiment 7 of the present invention. The wireless terminal device 1200 has a Doppler frequency detecting unit 1201 as a moving speed detecting means. The Doppler frequency detection unit 1201 detects the Doppler frequency of the received signal based on the output signal of the wireless reception unit (RF) 202, thereby detecting the moving speed of the wireless terminal device 1200.
The moving speed obtained by the Doppler frequency detecting unit 1201 is sent to the frame composing unit 1202.

The frame construction unit 1202 inputs the transmission data and the known data (unique word) and constructs a transmission frame according to the moving speed. Practically, the frame configuration unit 1202 changes the number of times of transmission of known symbols within the allocated slot time according to the moving speed, as shown in FIG. In the case of FIG. 13, known symbols are transmitted twice within the unit allocation slot time.

In this embodiment, radio terminal apparatus 1200 is provided with Doppler frequency detecting section 1201 and frame constructing section 1202, and only the uplink slot configuration has been described. By providing the frequency detection unit and the frame configuration unit, as shown in FIG. 13, it is possible to transmit a plurality of transmission frames for a downlink slot within a unit slot time according to the moving speed.

Here, when the fading state fluctuates at high speed (when the relative moving speed between the transmitting / receiving devices communicating with each other is high), it is difficult to follow the fading only by the channel estimation of the mobile station. Therefore, the mobile station once again transmits a known symbol to the base station, and the base station side performs inverse equalization processing for fading tracking of the mobile station and transmits it. This determination may be made by either the mobile station or the base station.

According to the above configuration, the number of transmissions of known symbols is changed according to the relative speed between the transmission / reception devices performing TDD communication with each other. Based on, the equalization processing can be performed while sequentially changing the equalization characteristics according to the radio propagation environment that changes instantaneously. As a result, in addition to the effects of the first embodiment, it is possible to realize a wireless base station device and a wireless terminal device with further improved reception performance.

(Embodiment 8) In FIG. 14 in which parts corresponding to those in FIG. 1 are assigned the same reference numerals, 1400 indicates the configuration of a radio base station apparatus according to Embodiment 8 of the present invention as a whole. The wireless base station device 1400 creates a delay profile of the received signal by the delay profile creating unit 1401. In the case of this embodiment, delay profile creating section 1401 creates a delay profile by averaging the delay profiles of the received signals in a predetermined period. As a result, the delay profile in which the influence of the noise component of the received signal is suppressed and the actual path is accurately reflected is created.

The created delay profile is sent to the delay spread detector 1402. The delay spread detector 1402 detects a delay spread indicating multipath spread based on the peak appearing in the delay profile.
The detected delay spread is sent to the frame composing unit 1403 and the parity adding unit 1404.

The transmission data and the known data to which the parity is added by the parity adding section 1404 are input to the frame forming section 1403. The parity adding unit 1404 adaptively changes the amount of parity added to transmission data according to the delay spread. In addition, the frame configuration unit 140
3 adaptively changes the transmission frame structure according to the delay spread.

FIG. 15 shows the slot structure in this embodiment. As can be seen from FIG. 15, the wireless base station device 1400 changes the number of known symbols (UW) according to the delay spread, and at the same time, the parity pattern (at the symbol position obtained by subtracting the current known symbol number from the maximum known symbol number). P) is inserted.

The number of known symbols is determined from the maximum delay spread and the number of taps of the adaptive equalizer. That is,
The delay profile (averaged profile) between the base station and the mobile station is calculated, and if the delay spread is not so wide, the equalization performance is hardly deteriorated even if the number of known symbols is reduced.

In consideration of this, in this embodiment, the number of known symbols is reduced as the delay spread is not widened. Also, parity symbol patterns are inserted by the number of reduced known symbols. As a result,
It is possible to transmit the maximum known symbol section as a protection section when a data section has a transfer error, and it is possible to improve the signal correction capability of the received data section.

According to the above configuration, the number of known symbols to be transmitted is adaptively changed according to the delay spread, and parity symbol patterns are inserted by the number of known symbols reduced, so that useless known symbols are transmitted. Since the parity pattern can be transmitted without doing so, in addition to the effect of the first embodiment, it is possible to realize a transmitting / receiving device with further improved reception performance.

(Embodiment 9) In this embodiment, a wireless terminal device superimposes a transmission signal on a plurality of carriers for transmission, and one carrier is dedicated to known symbol transmission for equalization rate setting. The case of using it as a carrier wave will be described.

FIG. 16 shows the slot configuration of this embodiment. As can be seen from FIG. 16, the wireless terminal device transmits a known signal (UW) for equalization and a normal signal from a plurality of carriers at the same time in the uplink slot.

The wireless terminal device superimposes a known symbol on a carrier dedicated to known symbol transmission, and transmits only the known symbol in uplink slot 2. The radio base station apparatus receives this slot 2 and sets the equalization rate as in the first embodiment. As a result, as can be seen from FIG. 16, the downlink communication speed can be maximized without changing the uplink communication speed.

Thus, according to this embodiment, the estimation of the equalization rate and the normal transmission can be performed in the same time,
Channel occupancy due to the estimation of the equalization rate is eliminated. As a result, it is possible to increase the substantial communication capacity and avoid interference between normal transmission data and known symbols.

(Other Embodiments) In the above embodiment, the case where the decision feedback equalizer is applied as the equalizing means of the present invention has been described, but the equalizing means applicable to the present invention is Not limited to the decision feedback equalizer, for example, an MLSE equalizer can be applied. The point is that the first transmitter / receiver transmits a transmission signal subjected to a part of the equalization processing, and the transmission signal is transmitted. If the second transmitting / receiving device for receiving performs the remaining equalization processing to obtain the received signal, the same effect as that of the above-described embodiment can be obtained.

Further, in the above-mentioned embodiment, the case where the transmitting / receiving apparatus according to the present invention is provided in the radio base station apparatus and the radio terminal apparatus has been described, but the present invention is not limited to this, and the point is that
It can be widely applied to wireless devices that transmit and receive with each other.

Further, in the above embodiment, the algorithm unit 108 uses the filter characteristic calculated by the algorithm at the time of reception as the filter characteristic of the FF unit 110
The case has been described where the filter characteristic of the FF unit 104 of the E equalizer 103 is set to have the same phase characteristic and opposite time characteristic, but the present invention is not limited to this, and the FF unit 110 is not limited to this. The filter characteristics of the FF unit 10
It may be the same as the filter characteristic of No. 4. With this configuration, the filter characteristic calculated for the FF unit 104 can be used as it is, and a part of the equalization process of the transmission signal can be favorably performed according to the transmission path characteristic.

[0136]

As described above, according to the present invention,
By providing a part of the equalization processing function of the second transmission / reception device in the transmission unit of the first transmission / reception unit, the configuration of the second transmission / reception device can be simplified accordingly. Further, since the reception unit of the second transmission / reception device also shares a part of the equalization process, even if the transmission path environment changes suddenly, the reception unit of the second transmission / reception device can perform the equalization process corresponding thereto. As a result, the reception quality of the second transmitter / receiver can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a radio base station apparatus according to Embodiment 1 of the present invention.

FIG. 2 is a block diagram showing a configuration of a wireless terminal device according to the first embodiment.

FIG. 3 is a block diagram showing the configuration of a radio base station apparatus according to Embodiment 2 of the present invention.

FIG. 4 is a diagram showing an instantaneous delay profile and an average delay profile used for explaining tap delay time selection of a DFE equalizer.

FIG. 5 is a block diagram showing a configuration of a radio base station apparatus according to Embodiment 3 of the present invention.

FIG. 6 is a flowchart for explaining tap coefficient calculation processing according to the third embodiment.

FIG. 7 is a block diagram showing the configuration of a radio base station apparatus according to Embodiment 4 of the present invention.

FIG. 8 is a flowchart for explaining tap coefficient calculation processing according to the fourth embodiment.

FIG. 9 is a block diagram showing the configuration of a radio base station apparatus according to Embodiment 5 of the present invention.

FIG. 10 is a flowchart for explaining tap coefficient calculation processing and reception diversity according to the fifth embodiment.

FIG. 11 is a diagram showing a slot configuration according to the sixth embodiment.

FIG. 12 is a block diagram showing a configuration of a wireless terminal device according to a seventh embodiment of the present invention.

FIG. 13 is a diagram showing a slot configuration according to the seventh embodiment.

FIG. 14 is a block diagram showing a configuration of a radio base station apparatus according to Embodiment 8 of the present invention.

FIG. 15 is a diagram showing a slot configuration according to the eighth embodiment.

FIG. 16 is a diagram showing a slot configuration according to the ninth embodiment.

FIG. 17 is a block diagram showing a configuration of a conventional decision feedback equalizer.

[Explanation of symbols]

100, 300, 500, 700, 900, 1400
Radio base station apparatus 103, 501, 502 Decision feedback equalizer (DFE equalizer) 104 Feedforward section 105, 204 Feedback section 108, 205, 303 Algorithm section 110, 522, 523 Transmission feedforward section 200, 1200 Radio Terminal device 301, 514, 515, 1401 Delay profile creation unit 302, 517, 701, 702 Tap delay amount calculation unit 518 Reception quality comparison unit 519, 902 Selection unit 901 Equalization error level calculation unit 903 Transmission control unit 1201 Doppler frequency detection Units 1202 and 1403 Frame configuration unit 1402 Delay spread detection unit 1404 Parity addition unit

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 5K004 AA01 BA02 BD01                 5K046 AA05 BA01 EE06 EE10 EE36                       EE56 EE57 EF02 EF13 EF19                 5K059 CC03 DD02 DD05                 5K067 AA02 AA24 BB04 CC10 CC24                       EE02 EE10 KK03 KK13

Claims (14)

[Claims] 1. A transmission / reception apparatus comprising: a received signal equalization means for equalizing a received signal; and a transmission signal equalization means for performing only a part of the equalization processing on the transmission signal. 2. A delay profile creation means for creating a delay profile of a received signal, and a tap delay amount calculation means for finding a tap delay amount of the received signal equalization means and the transmission signal equalization means based on a peak appearing in the delay profile. ,
An algorithm execution means for obtaining an optimum tap coefficient of the reception signal equalization means and the transmission signal equalization means set to the tap delay amount calculated by the tap delay amount calculation means,
The transmitter / receiver according to claim 1, further comprising: 3. A plurality of antennas, a plurality of reception signal equalization means for equalizing the reception signals of the respective antennas, and a plurality of transmissions for performing a part of the equalization processing on the transmission signals transmitted from the respective antennas. A signal equalization unit, a delay profile creation unit that creates a delay profile of each antenna reception signal, and a tap delay amount that determines a tap delay amount of the reception signal equalization unit and the transmission signal equalization unit based on the peak appearing in the delay profile. It is characterized by comprising a calculating means and an algorithm executing means for obtaining an optimum tap coefficient of the reception signal equalizing means and the transmission signal equalizing means set to the tap delay amount calculated by the tap delay amount calculating means. Transceiver. 4. The tap delay amount calculation means is a common tap for a plurality of received signal equalization means and a plurality of transmission signal equalization means based on a combined delay profile obtained by combining a plurality of delay profiles for each antenna reception signal. The transmitter / receiver according to claim 3, wherein a delay amount is obtained. 5. The tap delay amount calculation means is an independent tap for each reception signal equalization means and transmission signal equalization means based on a plurality of delay profiles for each antenna reception signal created by the delay profile creation means. The transmitter / receiver according to claim 3, wherein a delay amount is obtained. 6. An equalization error calculation means for obtaining an equalization error of each of a plurality of received signal equalization means, and a control for stopping transmission from an antenna corresponding to the received signal equalization means having an equalization error of a predetermined value or more. The transmission / reception apparatus according to any one of claims 3 to 5, further comprising a transmission control unit. 7. The received signal equalization means is a decision feedback equalizer having a feedforward type filter section and a feedback type filter section, and the transmitted signal equalization means is a feedforward type filter of the received signal equalization means. The transmitter / receiver according to any one of claims 1 to 6, which has the same configuration. 8. A wireless communication system including first and second transmission / reception devices that communicate with each other in a time division duplex system, the received signal equalizing means for equalizing a received signal, and the received signal equalization. A first transmission / reception apparatus including a transmission signal equalization unit that performs a part of the equalization processing on the transmission signal using the equalization characteristic obtained by the means; and the equalization processing received from the first transmission / reception apparatus. And a second transmission / reception device having a received signal equalization means for performing the remaining equalization processing on the signal on which a part of the above is applied. 9. The transmission signal equalizing means provided in the first transmitting / receiving device is a feedforward type filter,
9. The reception signal equalizer provided in the transmitter / receiver of claim 1 is a feedback type filter, and the decision feedback equalizer is formed by the transmission signal equalizer and the reception signal equalizer. The wireless communication system according to. 10. The first and / or second transmitting / receiving device comprises a moving speed detecting means for detecting a relative moving speed between the devices, and the second transmitting / receiving device has a first moving speed according to the relative moving speed. 10. The wireless communication system according to claim 8 or 9, wherein the number of times of transmission of known symbols to the transmitting / receiving device of is changed. 11. The first and / or second transmitting / receiving apparatus comprises delay spread detecting means for detecting a delay spread of a received signal, and the smaller the spread of the delay spread is, the more the number of known symbols to be transmitted to the partner side. 10. When the number of known symbols is reduced and the number of known symbols is reduced, a parity pattern corresponding to the reduced number of known symbols is inserted into a transmission frame and transmitted. Wireless communication system. 12. The first and / or second transmitting / receiving apparatus superimposes a transmission signal on a plurality of carrier waves for transmission, and one carrier wave is used as a carrier wave dedicated to known symbol transmission for equalization rate setting. The wireless communication system according to claim 8 or 9, characterized in that. 13. The radio according to claim 8, wherein the first transceiver is provided in a radio base station, and the second transceiver is provided in a radio terminal station. Communications system. 14. A transmission / reception signal obtained by performing a part of equalization processing is transmitted from a first transmission / reception apparatus, and a second transmission / reception apparatus that receives the transmission signal performs the remaining equalization processing to obtain a reception signal. A transmission / reception method characterized by the above.