WO2003065611A1 - Dispositif de transmission et de reception, systeme de radiocommunication et procede de transmission et de reception - Google Patents

Dispositif de transmission et de reception, systeme de radiocommunication et procede de transmission et de reception Download PDF

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Publication number
WO2003065611A1
WO2003065611A1 PCT/JP2003/000784 JP0300784W WO03065611A1 WO 2003065611 A1 WO2003065611 A1 WO 2003065611A1 JP 0300784 W JP0300784 W JP 0300784W WO 03065611 A1 WO03065611 A1 WO 03065611A1
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WO
WIPO (PCT)
Prior art keywords
transmission
equalization
reception
signal
unit
Prior art date
Application number
PCT/JP2003/000784
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English (en)
Japanese (ja)
Inventor
Sadaki Futagi
Isamu Yoshii
Original Assignee
Matsushita Electric Industrial Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co., Ltd. filed Critical Matsushita Electric Industrial Co., Ltd.
Publication of WO2003065611A1 publication Critical patent/WO2003065611A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03012—Arrangements for removing intersymbol interference operating in the time domain
    • H04L25/03019—Arrangements for removing intersymbol interference operating in the time domain adaptive, i.e. capable of adjustment during data reception
    • H04L25/03057—Arrangements for removing intersymbol interference operating in the time domain adaptive, i.e. capable of adjustment during data reception with a recursive structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03343—Arrangements at the transmitter end

Definitions

  • the present invention relates to, for example, signal equalization processing in a wireless communication system.
  • Background technique fe
  • equalization processing is generally used as a processing to restore a signal characteristic that fluctuates according to the state of a wireless transmission path and obtain a high-quality received signal.
  • equalization processes there is an adaptive equalization process in which the state of a transmission path is obtained based on a known signal included in a received signal, and the received signal is adaptively equalized according to the state of the transmission path.
  • Adaptive equalization processing is usually realized by providing an equalization filter at the receiving end of a transmitting / receiving apparatus that is communicating with each other.
  • a decision feedback equalizer DFE: Decision Feedback Equalizer
  • This DFE equalizer is configured as shown in FIG.
  • the equalizer 1 has a feed-forward section (hereinafter referred to as an FF section) 2 and a feedback section (hereinafter referred to as an FB section) 3.
  • the FF section 2 and the FB section 3 have a transversal filter (comb filter) configuration.
  • the input signal is processed by the FF unit 2, the output of the FB unit 3 is added by the adder 4, the equalization process is performed, the data is determined by the detector 5, and the result is output as the equalized output.
  • the DFE equalizer 1 first selects the optimal tap coefficients of the FF section and the FB section during the training period as a pre-stage for performing the actual signal equalization.
  • a switch provided on the input side of the algorithm unit 6 is connected to the learning sequence circuit 7, and a reference signal from the learning sequence circuit 7 is sent to the algorithm unit 6.
  • the algorithm part 6 The tap coefficients of the FF unit 2 and the FB unit 3 are updated so that the error from the output (for example, the mean square error) is minimized.
  • the algorithm unit 6 includes a least-mean-square (LMS) algorithm and a recursive's least-mean-square (RLS) algorithm as a successive update algorithm based on the minimum mean square error (MMSE) criterion. Is used.
  • the algorithm unit 6 causes the tap coefficients to converge within the training period by sequentially repeating the above-described operation on the reference signal from the learning sequence circuit 7 and the known symbol output from the adder 4.
  • the switch is connected to the output side of the detector 5, and a signal corresponding to the demodulated 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.
  • one transmitting / receiving apparatus performs adaptive equalization processing by the DFE equalizer 1 using the obtained optimum tap coefficient (hereinafter referred to as an equalization rate), and transmits the equalization rate to the transmitting / receiving apparatus of the communication partner.
  • an equalization rate the obtained optimum tap coefficient
  • the algorithm section 6 and the detector 5 can be omitted by performing the equalization processing by the feed-forward type filter and the feedback type filter using the transmitted equalization rate. And the configuration can be simplified.
  • the received fading is different depending on the frequency even under the same wireless transmission path environment. Only one transmitter / receiver can determine the equalization rate and share it with the other transmitter / receiver.
  • a communication system using the TDD scheme has a case where the moving speed of the mobile terminal device is high. Also, when the carrier frequency to be transmitted is high, the channel state changes rapidly.
  • the equalizing rate obtained by one of the transmitting and receiving apparatuses is used by the other transmitting and receiving apparatus, the equalizing rate may not be an optimum value for the other transmitting and receiving apparatus. As a result, the reception quality of the transmission / reception device having no algorithm unit deteriorates.
  • the second transmission / reception apparatus needs to know the current equalization rate in order to receive the equalization rate.
  • the second transmitting / receiving apparatus does not have an algorithm unit for calculating the equalization rate, it cannot calculate this. Therefore, there is a contradiction that the second transmitting / receiving apparatus cannot correctly receive the equalization rate from the first transmitting / receiving apparatus. Disclosure of the invention
  • An object of the present invention is to provide a transmission / reception device, a radio communication system, and a transmission / reception method that can perform good equalization processing with a simple configuration.
  • An object of the present invention is to provide an equalization processing unit in a reception unit of the first transmission / reception device among the first and second transmission / reception devices communicating with each other, and to provide the equalization processing unit in a transmission unit of the first transmission / reception device.
  • An equalization processing unit that performs a part of the equalization processing on the transmission signal in advance by using the equalization ratio obtained in step 2 is provided, and the reception unit of the second transmitting and receiving apparatus performs the remaining processing of the equalization processing. This is achieved by obtaining a received signal.
  • the configuration of the second transmission / reception device can be simplified by that much. it can.
  • the equalizing processing corresponding to the sudden change in the transmission path environment is performed by the receiving section of the second transmitting / receiving apparatus. , So that the reception quality of the second transmission / reception device can be improved.
  • the first transmitting / receiving device is provided in a wireless base station and the second transmitting / receiving device is provided in a wireless portable device such as a mobile phone
  • a small-sized wireless portable device with high reception quality can be realized. Can be.
  • Figure 1 is a block diagram showing the configuration of a conventional decision feedback equalizer
  • FIG. 2 is a block diagram showing the configuration of the radio base station apparatus according to Embodiment 1 of the present invention.
  • FIG. 3 is a block diagram illustrating a configuration of a wireless terminal device according to Embodiment 1;
  • FIG. 4 is a block diagram illustrating a configuration of a wireless base station device according to Embodiment 2 of the present invention;
  • Figure 5 shows the instantaneous delay profile and average delay profile used to explain the selection of the tap delay time of the DFE equalizer
  • FIG. 6 is a block diagram showing a configuration of a radio base station apparatus according to Embodiment 3 of the present invention.
  • FIG. 7 is a flowchart for explaining a tap coefficient calculation process according to the third embodiment.
  • FIG. 8 is a block diagram showing a configuration of a radio base station apparatus according to Embodiment 4 of the present invention.
  • FIG. 9 is a flowchart for explaining tap coefficient calculation processing according to the fourth embodiment.
  • FIG. 10 is a block diagram showing a configuration of a radio base station apparatus according to Embodiment 5 of the present invention
  • FIG. 11 is a flowchart for explaining tap coefficient calculation processing and reception diversity according to the fifth embodiment
  • FIG. 12 is a diagram showing a slot configuration according to the sixth embodiment.
  • FIG. 13 is a block diagram showing a configuration of a wireless terminal device according to Embodiment 7 of the present invention.
  • FIG. 14 is a diagram showing a slot configuration according to the seventh embodiment.
  • FIG. 15 is a block diagram showing a configuration of a radio base station apparatus according to Embodiment 8 of the present invention.
  • FIG. 16 is a diagram showing a slot configuration according to the eighth embodiment.
  • FIG. 17 is a diagram showing a slot configuration according to the ninth embodiment. BEST MODE FOR CARRYING OUT THE INVENTION
  • reference numeral 100 denotes the overall configuration of the radio base station apparatus according to Embodiment 1 of the present invention.
  • the radio base station apparatus 100 performs predetermined radio reception processing such as down-conversion and analog-to-digital conversion processing by the radio reception unit (RF) 102 on the reception signal received by the antenna 101, and then performs decision feedback (DFE) equalization Input to the container 103.
  • predetermined radio reception processing such as down-conversion and analog-to-digital conversion processing by the radio reception unit (RF) 102 on the reception signal received by the antenna 101, and then performs decision feedback (DFE) equalization Input to the container 103.
  • RF radio reception unit
  • DFE decision feedback
  • the equalizer 103 has a feedforward section (hereinafter, referred to as an FF section) 104 and a feedback section (hereinafter, referred to as an FB section) 105.
  • the FF 104 and the FB section 105 have a transversal filter (comb filter) configuration.
  • the FF section 104 and the FB section 105 are both shown with two taps for the sake of simplicity, but in practice, any tap length can be selected.
  • the received signal is first processed in the FF section 104.
  • the output of FF section 104 is an adder After being added to the output of the FB unit 105 at 106, it is sent to the algorithm unit 108 and the decision unit 107.
  • Judgment unit 107 judges the symbol of the received signal in the same manner as the data judgment unit of a normal demodulator, and sends the judgment value to algorithm unit 108.
  • the DFE equalizer 103 as a pre-stage of the equalization of the received signal, first, there is a training period in which an optimal tap coefficient is set based on known data such as a universal code. During this training period, the algorithm unit updates the tap coefficients of the FF unit 104 and the FB unit 105 so that the error between the reference signal (known data) and the judgment value of the judgment unit 107 is minimized.
  • the algorithm unit 108 uses a least-mean-square (LMS) algorithm or a recursive 'least' mean-square (RLS) algorithm as a successive update algorithm based on the minimum mean square error (MMSE) criterion. Used.
  • LMS least-mean-square
  • RLS recursive 'least' mean-square
  • MMSE minimum mean square error
  • the algorithm unit 108 reduces the error between the addition signal output from the adder 106 and the determination value output from the determiner 107,
  • the tap coefficients of the FF section 104 and the FB section 105 are changed so that the symbol position on the plane is located at the center between the determination thresholds. In this way, the algorithm unit 108 returns the reception symbol subjected to the transmission path fluctuation to a predetermined signal point position by appropriately changing the tap coefficients of the FF unit 104 and the FB unit 105.
  • the transmission section of the radio base station apparatus 100 is provided with a transmission feedforward section (FF section) 110.
  • the transmission data and the known data that have been subjected to the modulation processing by the modulation section 111 are input to the FF section 110.
  • the algorithm unit 108 uses the filter characteristics of the FF unit 110 using the filter characteristics calculated by the above-described algorithm at the time of reception, and uses the same filter characteristics as the phase characteristics of the FF unit 104 of the DFE equalizer 103.
  • time characteristics are set to have the opposite characteristics. Specifically, set the same value as the tap coefficient. On the other hand, a value with the opposite characteristic is set as the tap delay amount.
  • the transmission signal filtered by the FF unit 110 is subjected to predetermined radio transmission processing such as digital-to-analog conversion processing and up-conversion by the radio transmission unit (RF unit) 112, and then transmitted from the antenna 101. Is done.
  • predetermined radio transmission processing such as digital-to-analog conversion processing and up-conversion by the radio transmission unit (RF unit) 112, and then transmitted from the antenna 101. Is done.
  • FIG. 3 shows a configuration of a wireless terminal device 200 that performs wireless communication with the wireless base station device 100 of FIG.
  • Radio terminal apparatus 200 inputs a signal transmitted from radio base station apparatus 100 to radio reception section (RF section) 202 via antenna 201.
  • the radio reception unit 202 performs predetermined radio reception processing such as down-conversion to analog-to-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 after the filter processing by the feedback unit (FB unit) 204 to send the added signal directly to the algorithm unit 205 and determiner 206 To the algorithm unit 205 via
  • FB unit feedback unit
  • Judgment unit 206 judges the symbol of the received signal in the same manner as the data judgment unit of a normal demodulator, and sends the judgment value to algorithm unit 205.
  • the algorithm unit 205 finds the optimum tap coefficient of the FB unit 204 in the same manner as the above-mentioned algorithm unit 108 (FIG. 2), and sequentially changes the tap coefficient of the FB unit 204 with the obtained value.
  • the transmitting section of the wireless terminal apparatus 200 digitally modulates the transmission data and the known data by the modulating section 210 and transmits the modulated signal via the radio transmitting section (RF) 211 and the antenna 201. To send.
  • RF radio transmitting section
  • the wireless base station device 100 and the wireless terminal device 200 perform communication by the TDD scheme.
  • known data is transmitted from the wireless terminal 200.
  • the radio base station apparatus 100 receives the known data and inputs the data to the DFE equalizer 103.
  • the algorithm unit 108 finds the optimum tap coefficients of the FF unit 104 and the FB unit 105 based on the known data, and calculates the optimum tap coefficients in the FF unit 104 and the FB unit. Set as a tap coefficient of 105.
  • the algorithm section 108 has a phase characteristic with respect to the filter characteristic set in the FF section 104. Are set, and the tap coefficient and tap delay amount of the FF section 110 are set so that the time characteristics are opposite.
  • the wireless base station apparatus 100 transmits known data to the wireless terminal apparatus 200.
  • This known data is transmitted as a signal that has been subjected to filtering processing by the FF section 110.
  • the fading state occurring between the antennas 101 and 201 and the arrival time of each multipath are determined by the wireless base station. It is considered that the reception of the device 100 and the reception of the wireless terminal device 200 are the same.
  • FF section 110 which has been conventionally arranged at the receiving end of the wireless terminal apparatus, is provided in the transmitting section of wireless base station apparatus 100, and the tap coefficient thereof is obtained at the time of reception. Selected according to the equalization rate.
  • good reception characteristics can be obtained as in the case where the FF unit and the FB unit are provided in the wireless terminal device 200.
  • radio terminal apparatus 200 When receiving a signal from 100 base stations, radio terminal apparatus 200 selects an equalization rate in FB section 204 based on the known data of the signal. At this time, in the radio terminal apparatus 200, since the FF section 110 of the radio base station apparatus 100 receives a signal that has already undergone a part of the equalization processing, only the tap coefficient of the FB section 2 ⁇ 4 is used in the algorithm section. What is necessary is to calculate to 205.
  • the feed-forward filter of the decision feedback equalizer is provided in the transmitting unit of the wireless base station device 100, and the feedback filter and the algorithm unit are provided. Is provided in the receiving unit of the wireless terminal device 200.
  • the fading state generated between the respective antennas 101 and 201 fluctuates slightly according to the moving speed of the wireless terminal device 200. Since it can be ignored, the filtering coefficient (tap coefficient) of the FB section 204 is changed by some fading. What is necessary is just to update so that width fluctuation may be absorbed. As a result, in the wireless terminal device 200, an algorithm for converging the tap coefficients can be performed in a short time, so that excellent reception performance can be obtained.
  • the FF unit 110 of the DEF equalizer is omitted from the wireless terminal device 200, and the FF unit 110 is provided in the transmission unit of the wireless base station device 100.
  • the configuration of the wireless terminal device 200 can be simplified while maintaining the reception quality of the line terminal device 200 at the same quality as that obtained by performing the DFE equalization processing. As a result, a small-sized wireless terminal apparatus 200 having excellent reception quality can be realized.
  • the FB section 204 in the wireless terminal apparatus 200, the optimum tap coefficient obtained in the wireless base station apparatus 100 is transmitted to the wireless terminal apparatus 200 and the wireless terminal apparatus 200 is transmitted. Compared with the case where the optimal tap coefficient calculation processing is omitted, the equalization processing by the FB 204 can be performed even when the transmission path environment changes abruptly. Can be suppressed.
  • the wireless terminal device 200 even when the arrival time of the main wave at the receiving unit of the wireless terminal device 200 is not accurate, the wireless terminal device 200 itself transmits a transmission signal to the wireless base station device 100 at the shifted timing. However, the error of the main wave arrival time can be adjusted by the FF section 110 of the wireless base station apparatus 100. As a result, the wireless terminal device 200 does not need to perform a high-accuracy main-wave time identification process, so that it is possible to reduce the number of frame synchronization and symbol synchronization circuits for performing the identification process. Therefore, the configuration of the wireless terminal device 200 can be further simplified.
  • 300 indicates the configuration of the wireless base station apparatus according to the second embodiment as a whole.
  • the wireless base station apparatus 300 has the same configuration as the wireless base station apparatus 100 in FIG. 2 except that the wireless base station apparatus 300 has a delay profile creation unit 301 and that the processing by the antenna algorithm unit 303 is different. It becomes.
  • the delay profile creation unit 301 is configured by a matched filter, and stores a known signal portion included in the reception signal output from the wireless reception unit 102 and a known signal portion in advance. A delay profile is created by finding the correlation at each point in time with the known data.
  • the delay profile creation 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. 5B, the main signal arrival time t 0 of the received signal is calculated from the averaged delay profile.
  • the main wave arrival time t 0 can be regarded as the head timing of each multipath wave in the received signal.
  • multipath is observed at time t1 and time t2.
  • the tap delay amount calculation unit 302 calculates (t1 ⁇ tO) and (t2 ⁇ t0) as delay times of the delay elements of the FF unit 104 and the FB unit 105 based on the peak of the delay profile, respectively. This is sent to the algorithm section 303.
  • the algorithm unit 303 sets the delay times of the delay elements of the FF unit 104 and the FB unit 105 to (t1 ⁇ t0) and (t2 ⁇ t0), respectively.
  • a delay profile creation unit 301 is provided, and the delay times of the delay elements of the FF unit 104 and the FB unit 105 are set based on the created delay profile.
  • FIG. 6 shows a configuration of a wireless base station device 500 according to the third embodiment.
  • Radio base station apparatus 500 has DFE equalizers 501 and 502 in a number corresponding to the number of antennas.
  • the configuration of DFE equalizers 501 and 502 is the same as that of DFE equalizer 103 (FIG. 2) described in Embodiment 1, and the same reference numerals as in FIG. Shown.
  • the corresponding parts in the DFE equalizer 501 are denoted with A after the code
  • the corresponding parts in the DFE equalizer 502 are denoted with B after the code.
  • Radio base station apparatus 500 transmits signals received by antennas 510 and 511 to delay profile creation sections 514 and 515 via radio reception sections (RF) 512 and 513, respectively.
  • Each of the delay profile creation units 514 and 515 creates a delay profile for the input signal.
  • the outputs of the delay profile creation units 514 and 515 are combined by the adder 516 and then sent to the tap delay amount calculation unit 517.
  • Tap delay amount calculating section 517 calculates a tap delay amount common to two DFE equalizers 501 and 502 from each delay profile. Then, the obtained tap delay amounts are sent to the algorithm units 108A and 108B of the 13 equalizers 501 and 502, respectively.
  • the algorithm units 108 A and 108 B calculate the delay amounts of the respective delay elements of the FF units 104 and FB units 105 of the DFE equalizers 501 and 502 in the same manner as described in the second embodiment. Set to the delay amount obtained by 7. Also, the algorithm unit 108 performs a process of calculating an optimal tap coefficient using known data, as in the first embodiment.
  • reception signals equalized by the respective DFE equalizers 501 and 502 are sent to a reception quality comparison unit 518 and a selection unit 519, respectively.
  • Reception quality comparison section 518 sends a comparison result signal indicating a reception signal having better reception quality to selection section 519 based on a signal to interference ratio (SIR) of each demodulated signal and a cyclic redundancy check (CRC).
  • SIR signal to interference ratio
  • CRC cyclic redundancy check
  • the selection section 519 selects and outputs the received demodulated signal having better reception quality among the two received demodulated signals based on the comparison result signal. As a result, the wireless base station device 500 Then, a reception diversity effect can be obtained.
  • the transmitting section of the radio base station apparatus 500 transmits the transmission data and the known data to the respective modulation sections 520 and 521 which perform the same modulation processing.
  • the modulated signal is filtered by transmission FF sections 522 and 523, and then transmitted from antennas 510 and 511 via radio transmission sections (RF) 524 and 525.
  • the tap coefficient of each multiplication circuit of the transmission FF section 522 is set to the same value as that of the FF section 104A of the reception section by the algorithm section 108A, and the tap coefficient of each multiplication circuit of the transmission FF section 523 is set. Is set to the same value as that of the FF unit 104B of the receiving unit by the algorithm unit 108B.
  • the tap delay amount of each delay element of the transmission FF section 522 is set by the algorithm section 108A to a value having the opposite characteristic to that of the FF section 104A of the reception section, and the tap delay of each delay element of the transmission FF section 523 is set.
  • the delay amount is set by the algorithm unit 108B to a value having a characteristic opposite to that of the FF unit 104B of the receiving unit.
  • step ST1 the delay profile creation sections 514, 515 obtain delay entry files for received signals received by the plurality of antennas 510, 511.
  • step ST2 the respective delay profiles are combined (added) by the adder 516.
  • tap delay amount calculation section 517 finds a common tap delay amount between antennas 510 and 511 from the combined delay profile.
  • the algorithm sections 108A and 1085 calculate the delay amounts of the delay elements of the FF sections 104A and 104B and the FB sections 105A and 105B of the 13FE equalizers 501 and 502 by using the tap delay amount calculation section 5. Set the delay amount obtained in step 17 and obtain the optimal tap coefficient using known data.
  • a delay profile is created for each of the received signals of the plurality of antennas 510, 511, and based on the delay profiles, the DFE equalizers 501, Common for 502 After setting the amount of tap delay, the DFE equalizers 501 and 502 determine the optimum tap coefficients, and select the signal of higher quality from the signals equalized by the DFE equalizers 501 and 502. By doing so, it is possible to reduce the calculation amount of the algorithm units 108 A and 108 B ′ and to obtain the reception diversity effect.
  • radio base station apparatus 700 of this embodiment independently adjusts the tap delay amounts of DFE equalizers 501 and 502, respectively.
  • the configuration is the same as that of the wireless base station device 500 of the third embodiment except that the setting is performed.
  • the tap delay amount calculation sections 701 and 702 calculate the independent tap delay amounts for each antenna branch based on the delay profiles created by the delay profile creation sections 514 and 515.
  • the algorithm sections 108A and 108B calculate the tap delay amounts of the sections 104 and 104B, the FB sections 105A and 1 ⁇ 5B and the transmission FF sections 522 and 523 by the corresponding tap delay amount calculation sections 701 and 702. Set the tap delay amount.
  • the algorithm units 108A and 108B perform the process of calculating the optimum tap coefficients based on the known data in the same manner as in the first embodiment, thereby forming , 523 are determined.
  • step ST11 delay profile creation units 514, 5 15 Finds the delay profile for the received signals received by the plurality of antennas 5 10 and 51 1.
  • step ST12 the tap delay amount calculation sections 701 and 702 obtain the tap delay amount independent of each antenna based on the corresponding delay profile.
  • the algorithm units 108A and 108B calculate the delay amounts of the delay elements of the FF units 104A, 1048, 8 units 1058 and 105B of the DFE equalizers 501 and 502 by tap delay amount calculation units 701 and 702.
  • the optimum tap coefficient is obtained using the known data.
  • a delay profile is created for each of the received signals of the plurality of antennas 510, 511, and the DFE equalizer 501 corresponding to each antenna 510, 511 is created based on those delay profiles.
  • the optimum tap coefficient is determined in the 0 £ equalizers 501 and 502, and the quality of the signals equalized by the 0 £ equalizers 501 and 502 is good.
  • a radio base station apparatus 700 capable of performing equalization processing on a received signal with a simple configuration and improving reception quality can be realized.
  • the time required for algorithm sections 108A and 108B to calculate the optimum tap coefficients can be further reduced. Also, since the tap delay amount of each transmitting FF section 522, 523 is set to a value corresponding to the optimal path, the amount of calculation for finding the optimal tap coefficient in the algorithm section in the wireless terminal device of the communication partner is also- Can be reduced.
  • the radio base station apparatus 900 includes an equalization error level calculation unit that calculates an equalization error level of the DFE equalizers 501 and 502 provided corresponding to the antennas 5110 and 511. It has 9 0 1
  • the equalization error level calculator 901 calculates an equalization error by each of the DFE equalizers 501 and 502. In practice, the equalization error level calculation unit 901 compares the signal after the DFE equalizers 501 and 502 have equalized known symbols such as Pipit symbols and unique codes with actual known symbols. By comparison, an equalization error level is calculated.
  • 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 selector 902 selectively outputs the equalized signal having the smaller equalization error level. Thereby, a reception diversity effect can be obtained.
  • the transmission control unit 903 compares the equalization error level of each antenna branch with a predetermined specified value. Then, transmission of the antenna branch whose equalization error level exceeds the specified value is stopped. In other words, transmission signals are transmitted only from antenna branches with excellent equalization capability.
  • the transmission control unit 903 stops the transmission from the antenna 510 by turning off the switch 904. Let it.
  • the transmission control unit 903 sets the antenna having the smaller equalization error level.
  • the transmission signal is transmitted from at least one of the antenna branches. It is designed to be able to output.
  • radio base station apparatus 900 performs equalization processing and transmission operation of each antenna branch signal by sequentially performing the processing shown in FIG. wireless
  • the tap delay amount calculation sections 701 and 702 obtain an independent tap delay amount for each antenna branch based on the corresponding delay profile.
  • the algorithm units 108A and 108B determine whether the DFE equalizers 501 and 502 ?
  • Units 104, 1048, 8 Set the delay amount of each delay element in units 105, 105B to the delay amount obtained by tap delay amount calculation units 701, 702, and obtain the optimal tap coefficient using known data. .
  • 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 section 903 selects an antenna branch whose equalization error level satisfies a specified value as a transmission antenna.
  • the radio base station apparatus 900 receives a path that exceeds the maximum delay amount of the assumed path by the antenna 510 or 511, for example, Stop sending. This makes it possible to prevent the communication terminal device from receiving a path outside the expected range.
  • FIG. 12 shows a time slot configuration according to Embodiment 6 of the present invention.
  • the reason why they are called uplink slot and downlink port in Fig. 12 is that one of the transmitting and receiving devices communicating with each other is assumed to be a wireless base station and the other is assumed to be a communication terminal. .
  • This embodiment proposes to freely change the uplink and downlink slot configurations within the range of the assigned slot time.
  • one transmission / reception apparatus estimates an equalization rate based on a signal from the other transmission / reception apparatus, and transmits using the estimated equalization rate.
  • communication is performed by changing an equalization rate according to a transmission path shared by only two transmitting / receiving apparatuses. Since the communication is closed only between two transceivers, there is no problem even if the slot configuration is freely changed between the two transceivers.
  • guard time 1 is set to absorb the time lag between ascending and descending.
  • guard time 2 is set to absorb the time lag between each transmitting and receiving device.
  • the slot configuration can be freely changed within the assigned slot time.
  • the guard time 1 and the guard time 2 can be set to desired times. As a result, equalization processing that is more suitable for the transmission path environment can be performed, and a transmission / reception apparatus with more excellent reception performance can be obtained.
  • the communication capacity of the first transmission / reception apparatus and the second transmission / reception apparatus within the assigned slot time By changing the ratio, in addition to the effect of the first embodiment, it is possible to increase the communication capacity and to realize a transmission / reception device with more excellent reception performance.
  • 1200 indicates the configuration of the wireless terminal apparatus according to Embodiment 7 of the present invention as a whole.
  • the wireless terminal device 120 ⁇ has a Doppler frequency detecting unit 1201 as moving speed detecting means.
  • the Doppler frequency detecting section 1221 detects the moving speed of the wireless terminal apparatus 1200 by detecting the Doppler frequency of the received signal based on the output signal of the wireless receiving section (R F) 202.
  • the moving speed obtained by the Doppler frequency detecting section 1221 is transmitted to the frame forming section 122.
  • the frame forming unit 1222 receives the transmission data and the known data (unique code) and forms a transmission frame according to the moving speed.
  • the frame configuration section 122 changes the number of transmissions of the known symbol in the assigned slot time according to the moving speed, as shown in FIG. In the case of Fig. 14, known symbol transmission is performed twice within the unit allocation slot time.
  • the radio terminal apparatus 1200 is provided with the Doppler frequency detection section 1221 and the frame configuration section 1222, and the description has been made focusing on only the uplink slot configuration.
  • the device side is also provided with a Doppler frequency detection unit and a frame configuration unit, a plurality of transmission frames can be transmitted within a unit slot time according to the moving speed, as shown in FIG. 14, as shown in FIG.
  • the mobile station transmits a known symbol to the base station, and the base station performs an inverse equalization process for tracking the fogging of the mobile station and transmits the symbol. This determination may be made by either the mobile station or the base station.
  • the number of transmissions of the known symbol can be changed according to the relative speed between the transmitting and receiving apparatuses that are performing the TDD communication with each other, so that the known symbol that arrives at a short interval can be transmitted. Based on this, it is possible to perform the equalization processing while sequentially changing the equalization characteristics in accordance with the instantaneously changing wireless propagation environment. As a result, in addition to the effects of Embodiment 1, it is possible to realize a wireless base station apparatus and a wireless terminal apparatus with further improved reception performance.
  • 1400 indicates the overall configuration of the radio base station apparatus according to Embodiment 8 of the present invention.
  • the wireless base station apparatus 1400 creates a delay port file of the received signal by the delay profile creation section 1401.
  • the delay profile creation unit 1441 creates a delay profile obtained by averaging the delay profiles of the received signals in a predetermined period. As a result, the effect of the noise component of the received signal is suppressed, and a delay profile that accurately reflects the actual path is created.
  • the created delay profile is sent to the delay spread detector 1402.
  • the delay spread detecting section 1442 detects a delay spread indicating the spread of the multipath based on the peak appearing in the delay profile.
  • the detected delay spread is sent to the frame forming unit 1443 and the parity adding unit 144.
  • FIG. 16 shows a slot configuration according to this embodiment.
  • the radio base station apparatus 1400 changes the number of known symbols (UW) according to the delay spread and subtracts the current number of known symbols from the maximum number of known symbols. Insert parity pattern (P) at symbol position.
  • UW number of known symbols
  • P Insert parity pattern
  • 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 between the base station and the mobile station (averaged file) is calculated. If the delay spread is not so wide, even if the number of known symbols is reduced, there is almost no deterioration in the equalization performance. .
  • the number of known symbols is reduced as the delay spread is not spread. Also, parity symbol patterns are inserted for the reduced number of known symbols. As a result, it is possible to transmit the maximum known symbol section as a protection section in the event of a transfer error in the data section, and it is possible to improve the signal correction capability of the reception data section.
  • the number of known symbols to be transmitted is adaptively changed according to the delay spread, and parity symbol patterns are inserted by the reduced number of known symbols, so that unnecessary known symbols are not transmitted. Since the parity pattern can be transmitted, it is possible to realize a transmission / reception device with further improved reception performance in addition to the effect of the first embodiment.
  • This embodiment proposes that the wireless terminal device superimpose a transmission signal on a plurality of carriers and transmit the same, and use one carrier as a carrier dedicated to transmitting a known symbol for setting an equalization rate.
  • FIG. 17 shows the slot configuration of this embodiment.
  • the wireless terminal equipment performs equalization from multiple carriers at the same time in the uplink slot. Transmit known signal (uw) and normal signal.
  • the wireless terminal device superimposes the known symbol on the carrier dedicated to transmitting the known symbol, 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. 17, the downlink communication speed can be maximized without changing the uplink communication speed.
  • the estimation of the equalization rate and the normal transmission can be performed in the same time, the occupation of the channel by 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 the known symbol.
  • the equalizing means applicable to the present invention is not limited to the decision feedback equalizer.
  • an MLSE equalizer can be applied.
  • a second transmitting / receiving apparatus that transmits a transmission signal subjected to a part of the equalization processing from the first transmitting / receiving apparatus and receives the transmission signal If the received signal is obtained by performing the remaining equalization processing, the same effect as in the above-described embodiment can be obtained.
  • the transmitting / receiving apparatus according to the present invention is provided in the radio base station apparatus and the radio terminal apparatus.
  • the present invention is not limited to this, Can be applied.
  • the filter characteristic of the algorithm unit 108 is used to calculate the filter characteristic of the FF unit 110 using the filter characteristic calculated by the algorithm at the time of reception. 4, the case where the phase characteristics are set to be the same and the time characteristics are set to have the opposite characteristics has been described.However, the present invention is not limited to this.
  • the filter characteristics may be the same as those of the unit 104. In this way, the filter characteristics calculated for the FF section 104 are used as they are, and one of the transmission signal equalization processes is performed according to the transmission path characteristics. Can be performed well.
  • the present invention is not limited to the configuration of the above-described embodiment, and can be implemented by appropriately changing the configuration.
  • the transmission / reception apparatus of the present invention employs a configuration including a reception signal equalization unit that performs equalization processing on a reception signal and a transmission signal equalization unit that performs only a part of the equalization processing on the transmission signal.
  • the transmission signal transmitted after being subjected to a part of the equalization processing by the transmission signal equalization means is received by the wireless station of the communication partner, subjected to the remaining equalization processing, and finally transmitted.
  • a received signal is obtained.
  • the configuration of the wireless station of the communication partner can be simplified by the amount of the partial equalization performed by the transmission / reception device of the present invention.
  • all of the equalization characteristics of the transmission signal equalization means are adapted to the state of the received signal by leaving a part of the equalization processing at the communication partner.
  • the transmitting and receiving apparatus of the present invention further includes: a delay profile creation unit for creating a delay profile of the reception signal; and a tap delay amount of the reception signal equalization unit and the transmission signal equalization unit based on a peak appearing in the delay profile. And an algorithm executing means for obtaining optimum tap coefficients 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. It adopts the configuration to do.
  • the tap delay amount is set based on the peak that appears in the delay profile, it is possible to perform equalization processing that is narrowed down to a main wave or a delay wave that is a target of substantial equalization processing. .
  • the amount of calculation processing for calculating the optimum tap coefficient by the algorithm execution means can be reduced, and the reception signal equalization means and And the amount of equalization processing of the transmission signal equalization means can be reduced.
  • the transmitting / receiving apparatus of the present invention includes a plurality of antennas, a plurality of reception signal equalizing means for performing equalization processing on each antenna reception signal, and an equalization processing for a transmission signal transmitted from each antenna.
  • a plurality of transmission signal equalizing means for applying a section, a delay profile creation means for creating a delay profile of each antenna reception signal, and taps of the reception signal equalization means and the transmission signal equalization means based on a peak appearing in the delay profile.
  • the tap delay amount calculating means includes a plurality of received signal equalizing means and a plurality of transmission signal based on a combined delay profile obtained by combining a plurality of delay profiles for each antenna received signal. A configuration to find a common tap delay amount for the equalization means is adopted.
  • a common tap delay amount is obtained 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. For example, the reception signal level from a certain antenna is obtained. Even if the noise level is not enough 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 for each antenna, so It is possible to prevent the precision of the reception signal equalization processing and the transmission signal equalization processing from extremely lowering.
  • the tap delay amount calculating means may include a plurality of delay profiles for each antenna reception signal created by the delay profile creating means. A configuration is adopted in which independent tap delay amounts are obtained for each of the reception signal equalization means and the transmission signal equalization means based on the filter.
  • the transmission / reception apparatus of the present invention includes: an equalization error calculating means for calculating an equalization error of each of the plurality of reception signal equalization means; A transmission control means for performing stop control is further provided.
  • the predetermined value is set by the equalization error calculation means.
  • the above equalization error is obtained, and transmission from the antenna is stopped by the transmission control means.
  • the reception signal equalization means is a decision feedback equalizer having a feed-forward filter section and a feedback filter section
  • the transmission signal equalization means is a reception signal equalization means.
  • the configuration is the same as that of the feed-forward type filter.
  • the filter characteristics of the feedforward filter of the transmission signal equalization means that is, the tap delay amount and the tap coefficient
  • the reception signal Using the filter characteristics calculated by the equalizing means as it is, it is possible to form a transmission signal equalizing means capable of satisfactorily performing a part of the transmission signal equalization processing according to the transmission path characteristics.
  • send The configuration of the transmission signal equalization unit can be simplified by eliminating the need for separately providing an algorithm unit as the signal equalization unit.
  • the wireless communication system of the present invention is a wireless communication system including first and second transmission / reception devices that communicate with each other in a time-division duplex system, and includes a reception signal equalization unit that performs equalization processing on a reception signal.
  • a first transmission / reception device including transmission signal equalization means for performing a part of an equalization process on a transmission signal using the equalization characteristics obtained by the reception signal equalization means; and a first transmission / reception device.
  • a second transmission / reception device including a reception signal equalizing unit that performs a remaining equalization process on a signal that has been subjected to a part of the equalization process received from the second device.
  • the first transmission / reception apparatus receives a signal transmitted from the second transmission / reception apparatus in a certain time slot, and performs equalization processing on the received signal by the reception signal equalization unit, thereby performing equalization processing. A later received signal is obtained.
  • the first transmission / reception device applies a part of the equalization process to the transmission signal by the transmission signal equalization means in the next time slot and transmits the signal. This signal is received by the second transmission / reception device, and the remaining equalization processing is performed.
  • the configuration of the second transmitting / receiving apparatus can be simplified by the amount of the partial equalization performed by the first transmitting / receiving apparatus.
  • the first transmitting / receiving apparatus performs only a part of the equalization processing on the transmission signal
  • the second transmitting / receiving apparatus performs the remaining equalization processing.
  • the transmission signal equalization means provided in the first transmission / reception apparatus is a feedforward type filter
  • the reception signal equalization means provided in the second transmission / reception apparatus is feedback.
  • a configuration is adopted in which a decision feedback equalizer is formed by the transmission signal equalization means and the reception signal equalization means. According to this configuration, since a decision feedback equalizer with a wireless transmission path interposed is formed between the transmission section of the first transmission / reception apparatus and the reception section of the second transmission / reception apparatus, the wireless transmission path fluctuates. Even so, the equalization processing can be performed following this satisfactorily.
  • the first and / or second transmitting / receiving device includes a moving speed detecting means for detecting a relative moving speed between the devices, and the second transmitting / receiving device detects the relative moving speed.
  • a configuration is adopted in which the number of transmissions of the known symbol to the first transmitting / receiving apparatus is changed accordingly.
  • the first transmitting / receiving apparatus can perform the equalization processing while sequentially changing the equalization characteristics in accordance with the instantaneously changing wireless propagation environment, based on the known symbols that arrive at short intervals.
  • the first and / or second transmission / reception device includes delay spread detecting means for detecting a delay spread of the received signal, and the smaller the spread of the delay spread, the more the transmission is performed to the other party.
  • the number of symbols of the known symbol is reduced, and when the number of symbols of the known symbol is reduced, a parity pattern corresponding to the decrease of the number of known symbols is inserted into a transmission frame and transmitted.
  • the first and / or second transmitting / receiving apparatus transmits the transmission signal by superimposing the transmission signal on a plurality of carriers, and one carrier is dedicated to transmitting a known symbol for setting an equalization rate.
  • the configuration used as a carrier wave is adopted.
  • the estimation of the equalization rate and the normal data transmission in the equalization means are performed. Since it can be performed in the same time, the channel occupation for estimating the equalization rate is eliminated, and the substantial communication capacity can be increased. In addition, since the known symbol is transmitted by a dedicated carrier, interference between normal transmission data and the known symbol can be avoided.
  • the wireless communication system of the present invention employs a configuration in which the first transmitting / receiving device is provided in a wireless base station and the second transmitting / receiving device is provided in a wireless terminal station.
  • a wireless terminal station with a simple configuration can be realized without deteriorating the reception quality.
  • a portable wireless terminal station such as a mobile phone or a portable information terminal
  • a small and portable wireless terminal station can be obtained.
  • the transmission / reception device that has performed a part of the equalization processing is transmitted from the first transmission / reception device, and the second transmission / reception device that receives the transmission signal performs the remaining equalization processing. Get the received signal.
  • the configuration of the second transmitting / receiving apparatus can be simplified by the amount of the partial equalization performed by the first transmitting / receiving apparatus.
  • the first transmitting / receiving apparatus performs only a part of the equalization processing on the transmission signal
  • the second transmitting / receiving apparatus performs the remaining equalization processing.
  • the transmission / reception device of the first and second transmission / reception devices share, so that even if there is some variation in the transmission channel between the reception and transmission of the first transmission / reception device, the transmission line variation can be followed.
  • Equalization processing can be performed.
  • the configuration of the second transmitting / receiving apparatus can be simplified without deteriorating the reception quality of the second transmitting / receiving apparatus.
  • the transmission unit of the first transmission / reception unit is provided with a part of the equalization processing function of the second transmission / reception device.
  • the configuration can be simplified.
  • the receiving unit of the second transmitting / receiving device also shares a part of the equalizing process, even if the transmission path environment changes rapidly, the receiving unit of the second transmitting / receiving device can perform the equalizing process corresponding to this. As a result, the reception quality of the second transmission / reception device can be improved.
  • the present invention can be applied to, for example, a mobile phone in a mobile communication system, a communication terminal device, and a wireless base station device that performs wireless communication with a communication terminal device.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Radio Transmission System (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

L'invention concerne un premier et un second dispositif de transmission et de réception, en communication mutuelle, le premier dispositif de transmission et de réception (100) étant équipé d'une section d'égalisation (110) pour soumettre un signal transmis à une partie d'un processus d'égalisation en avance, l'autre partie du processus d'égalisation étant mise en oeuvre dans une section de réception du second dispositif de transmission et de réception, ce qui permet d'obtenir le signal reçu.
PCT/JP2003/000784 2002-01-29 2003-01-28 Dispositif de transmission et de reception, systeme de radiocommunication et procede de transmission et de reception WO2003065611A1 (fr)

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JP4522919B2 (ja) * 2005-07-15 2010-08-11 三菱電機株式会社 等化器及び受信装置
JP4717557B2 (ja) * 2005-08-30 2011-07-06 三菱電機株式会社 通信システムおよび送受信装置
JP2007124412A (ja) * 2005-10-28 2007-05-17 Kyocera Corp 無線通信装置及びその信号処理方法
JP4527079B2 (ja) * 2006-04-28 2010-08-18 三菱電機株式会社 等化装置
WO2010090050A1 (fr) 2009-02-04 2010-08-12 日本電気株式会社 Système de communication optique et procédé de communication optique
KR102224640B1 (ko) * 2019-09-04 2021-03-08 국방과학연구소 오류 전파 검출에 기반하는 양방향 등화 장치 및 그 방법, 그 방법을 프로세서가 수행하도록 하기 위한 명령어를 포함하는 컴퓨터 판독 가능한 기록매체 및 컴퓨터 프로그램

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