US20070162819A1 - Signal transmitting method and transmitter in radio multiplex transmission system - Google Patents

Signal transmitting method and transmitter in radio multiplex transmission system Download PDF

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Publication number
US20070162819A1
US20070162819A1 US10/571,129 US57112904A US2007162819A1 US 20070162819 A1 US20070162819 A1 US 20070162819A1 US 57112904 A US57112904 A US 57112904A US 2007162819 A1 US2007162819 A1 US 2007162819A1
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Prior art keywords
parallel
serial
signals
error
correcting
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US10/571,129
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Junichiro Kawamoto
Takahiro Asai
Kenichi Higuchi
Mamoru Sawahashi
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NTT Docomo Inc
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NTT Docomo Inc
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Assigned to NTT DOCOMO, INC. reassignment NTT DOCOMO, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ASAI, TAKAHIRO, HIGUCHI, KENICHI, KAWAMOTO, JUNICHIRO, SAWAHASHI, MAMORU
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0041—Arrangements at the transmitter end
    • H04L1/0043—Realisations of complexity reduction techniques, e.g. use of look-up tables
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/0842—Weighted combining
    • H04B7/0848—Joint weighting
    • H04B7/0854—Joint weighting using error minimizing algorithms, e.g. minimum mean squared error [MMSE], "cross-correlation" or matrix inversion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0071—Use of interleaving
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0618—Space-time coding
    • H04L1/0625—Transmitter arrangements

Definitions

  • the present invention generally relates to a signal transmission method and a transmitter in a radio multiplex transmission system and more particularly to a transmission method and a transmitter in a MIMO transmission system, in which the amount of processing for error-correcting encoding, interleaving, and deinterleaving and/or error-correcting decoding is reduced.
  • MIMO Multiple-Input Multiple-Output
  • both a transmission side and a reception side have N disposed antennas and plural different signals are efficiently transmitted at the same time using the same frequency band through a network with N port inputs and N port outputs connected via a radio circuit.
  • the method is intended to enlarge the capacity of transmission by increasing the numbers of transmission antennas and reception antennas so as to use space in a multiple manner.
  • FIG. 2 shows an example of a conventional MIMO transmission system.
  • a transmitter 210 comprises an error-correcting encoder 214 , an interleaver 218 , a serial-to-parallel converter 212 , and N antennas 224 .
  • a receiver 240 comprises N antennas 254 , a signal separator 252 , a parallel-to-serial converter 242 , a deinterleaver 248 , and an error-correcting decoder 244 .
  • Interleaving is a process for switching the order of encoded bit data series prior to modulation and performing the reverse operation after demodulation. The interleaving is used to separate and relocate burst errors exceeding several code words (block codes) or a constraint length (trellis codes) in order to accurately decode exact random errors with a high probability in accordance with designed codes.
  • transmission data 211 are encoded with error-correcting codes, interleaved, and then resultant serial data is serial-to-parallel converted, thereby gaining N parallel data sets.
  • Each parallel data set is transmitted using the corresponding transmission antenna 224 .
  • each of the antennas 254 of the receiver 240 receives signals transmitted from the transmitter 210 .
  • the received signals are separated into N parallel signals using the signal separator 252 of the receiver 240 .
  • the N parallel signals after the signal separation are parallel-to-serial converted, deinterleaved, and the error-correcting codes are decoded.
  • Non-patent Document 1 “MF and MMSE Combined Iterative Soft Interference Canceller for MIMO/QFDM Systems” by Takumi ITO, Xiaodong WANG, Yoshikazu KIMURA, Mohammad MADIHIAN, and Akihisa USHIROKAWA, The Technical Report of the Institute of Electronics, Information and Communication Engineers of Japan, RCS2002-295, pp. 117-124, March, 2003
  • the present invention has been made in view of the aforementioned problem. It is a general object of the present invention to provide an improved and useful MIMO transmission system in which the above-mentioned problem is eliminated.
  • a more specific object of the present invention is to provide a MIMO transmission system in which the amount of processing for error-correcting encoding, interleaving, and/or error-correcting decoding is reduced in a transmitter and/or a receiver.
  • Another object of the present invention is to provide a MIMO transmission system as mentioned above such that even a space diversity effect is obtained.
  • a signal transmission method in a radio multiplex transmission system comprises the steps of: serial-to-parallel converting serial data to be transmitted into N (N: two or more) parallel data series; independently performing an error-correcting encoding process and/or an interleaving process on the parallel signals of the N data series serial-to-parallel converted; transmitting each of the processed signals using plural transmission antennas; receiving the transmitted signals; separating the received signals into M (M: two or more) data series; independently performing a deinterleaving process and/or an error-correcting decoding process on each of the separated signals; and parallel-to-serial converting the processed signals, thereby recovering the transmitted data.
  • a signal transmission method in a radio multiplex transmission system comprises the steps of: serial-to-parallel converting serial data to be transmitted into M (M: two or more) parallel data series; independently performing an error-correcting encoding process on the parallel signals of the M data series serial-to-parallel converted; parallel-to-serial converting the parallel signals encoded with error-correcting codes; performing an interleaving process on the parallel-to-serial converted signals; serial-to-parallel converting the interleaved signals into N (N: two or more) parallel data series and transmitting each of the N data series using plural transmission antennas; receiving the transmitted signals; separating the received signals into M (M: two or more) data series and parallel-to-serial converting the M data series: performing a-deinterleaving process on the parallel-to-serial converted signals; serial-to-parallel converting the deinterleaved signals into N data series; independently performing an error-correcting decoding
  • a signal reception method in a radio multiplex transmission system comprises the steps of: receiving signals transmitted from a transmitter, using plural antennas; separating the received signals into N (N: two or more) data series and parallel-to-serial converting the N data series; performing a deinterleaving process on the parallel-to-serial converted signals; serial-to-parallel converting the deinterleaved signals into M parallel data series; independently performing an error-correcting decoding process on the parallel signals of the M data series serial-to-parallel converted; and parallel-to-serial converting the signals in which error-correcting codes are decoded, thereby recovering the transmitted data.
  • the error-correcting encoding process and the interleaving process are performed for each of the transmission antennas after information is serial-to-parallel converted into the same number of data series as the transmission antennas.
  • the deinterleaving process and the error-correcting decoding process are performed on each of the signal data series after the signal separation. Transmitted information is recovered after the parallel-to-serial conversion.
  • the error-correcting encoding process is independently performed for each of the transmission antennas in a parallel manner after information is serial-to-parallel converted into the same number of data series as the transmission antennas.
  • the interleaving process is performed after the parallel-to-serial conversion.
  • the deinterleaving process is performed on each of the separated signal data series after the parallel-to-serial conversion.
  • the error-correcting decoding process is independently performed on each of the signal data series in a parallel manner after the serial-to-parallel conversion. Transmitted information is recovered after the parallel-to-serial conversion.
  • the error-correcting encoding process is performed before information is serial-to-parallel converted into the same number of data series as the transmission antennas.
  • the interleaving process is performed for each of the transmission antennas after the serial-to-parallel conversion on the reception side, the deinterleaving process is performed on each of the separated signal data series. Further, the error-correcting decoding process is performed after the parallel-to-serial conversion, thereby recovering transmitted information.
  • FIG. 1 is a conceptual diagram of a MIMO transmission system to which an embodiment of the present invention can be applied;
  • FIG. 2 is a block diagram of a conventional MIMO transmission system
  • FIG. 3 is a schematic block diagram of a MIMO transmission system according to a first embodiment
  • FIG. 4 is a schematic block diagram of a MIMO transmission system according to a second embodiment
  • FIG. 5 is a schematic block diagram of a MIMO transmission system according to a third embodiment
  • FIG. 6 is a comparative graph of a conventional MIMO transmission system and MIMO transmission systems according to embodiments
  • FIG. 7 is a block diagram of a transmitter performing a control method according to the fourth and fifth embodiments.
  • FIG. 8 is a block diagram of a receiver performing a control method according to the fourth and fifth embodiments.
  • FIG. 3 is a schematic block diagram of a MIMO transmission system according to a first embodiment of the present invention.
  • a transmitter 310 comprises a serial-to-parallel converter 312 , N error-correcting encoders 314 , N interleavers 318 , and N antennas 324 .
  • a receiver 340 comprises N antennas 354 , a signal separator 352 , N deinterleavers 348 , N error-correcting decoders 344 , and a parallel-to-serial converter 342 .
  • serial transmission data 311 are serial-to-parallel converted.
  • N parallel data series gained through the serial-to-parallel conversion are encoded with error-correcting codes and interleaved.
  • each parallel data series is transmitted using the corresponding antenna 324 .
  • each of the antennas 354 of the receiver 340 receives signals transmitted from the transmitter 310 .
  • the received signals are separated into N parallel signals using the signal separator 352 of the receiver 340 .
  • the N parallel signals after the signal separation are first deinterleaved, and then the error-correcting codes are decoded.
  • the N parallel signals are parallel-to-serial converted, thereby gaining data 341 in which the transmitted information is recovered.
  • the processing speed required for each error-correcting encoder, decoder, interleaver, and deinterleaver is reduced to one Nth in comparison with the example of a conventional MIMO transmission system. Accordingly, the size of the interleaver and the deinterleaver can be reduced.
  • FIG. 4 is a schematic block diagram of a MIMO transmission system according to a second embodiment of the present invention.
  • a transmitter 410 comprises a serial-to-parallel converter 412 , M error-correcting encoders 414 , a parallel-to-serial converter 416 , an interleaver 418 , a serial-to-parallel converter 420 , and N antennas 424 .
  • a receiver 440 comprises N antennas 454 , a signal separator 452 , a parallel-to-serial converter 450 , a deinterleaver 448 , a serial-to-parallel converter 446 , M error-correcting decoders 444 , and a parallel-to-serial converter 442 .
  • serial transmission data 411 is serial-to-parallel converted.
  • M parallel data series gained through the serial-to-parallel conversion are encoded with error-correcting codes independently in a parallel manner.
  • the encoded parallel data series are parallel-to-serial converted and interleaved.
  • the interleaved serial data are serial-to-parallel converted, and then each of the parallel data series is transmitted using the corresponding N transmission antenna 424 .
  • each of the N antennas 454 of the receiver 440 receives signals transmitted from the transmitter 410 .
  • the received signals are separated into N parallel signals using the signal separator 452 of the receiver 440 .
  • the N parallel signals after the signal separation are first parallel-to-serial converted and the obtained serial data are deinterleaved. Thereafter, the deinterleaved serial data are serial-to-parallel converted again and an error-correcting decoding is performed on the M signal data series independently in a parallel manner.
  • the decoded parallel data are parallel-to-serial converted, thereby gaining data 441 in which the transmitted information is recovered.
  • N and M may or may not be the same.
  • the structure of the second embodiment it is possible to perform the error-correcting encoding process on each signal data series after the serial-to-parallel conversion on the transmission side. Also, it is possible to perform the error-correcting decoding process on each of the signal data series after the signal separation in a parallel manner on the reception side. Thus, the amount of processing required for each error-correcting encoder and error-correcting decoder is reduced to one Mth in comparison with the example of a conventional MIMO transmission system.
  • a space diversity effect on the interleaving can be obtained by performing the interleaving process on serial information before the serial-to-parallel conversion into signals for each of the transmission antennas.
  • the characteristics of an error rate are improved in comparison with the first embodiment.
  • FIG. 5 is a schematic block diagram of a MIMO transmission system according to a third embodiment of the present invention.
  • a transmitter 510 comprises an error-correcting encoder 514 , a serial-to-parallel converter 520 , an interleaver 518 , and N antennas 524 .
  • a receiver 540 comprises N antennas 554 , a signal separator 552 , a deinterleaver 548 , a parallel-to-serial converter 542 , and an error-correcting decoder 544 .
  • serial transmission data 511 are encoded with error-correcting codes. Then, the encoded data are serial-to-parallel converted and N parallel data series gained through the serial-to-parallel conversion are interleaved independently in a parallel manner. Thereafter, each parallel data series is transmitted using the corresponding antenna 524 .
  • each of the N antennas 554 of the receiver 540 receives signals transmitted from the transmitter 510 .
  • the received signals are separated into N parallel signals using the signal separator 552 of the receiver 540 .
  • the N parallel signals after the signal separation are first deinterleaved and then parallel-to-serial converted.
  • An error-correcting decoding is performed on the gained serial data, thereby gaining data 541 in which the transmitted information is recovered.
  • FIG. 6 shows a result of computer simulation regarding the characteristics of average packet error rates of received Eb/No (Eb: electric power of received signals per one bit of information, No: noise power density) in the MIMO transmission systems according to the example of conventional techniques and the first through the third embodiments.
  • a turbo encoding process with a constraint length of 4 is used as an error-correcting encoding process on the transmission side
  • a symbol interleaving process is used as an interleaving process on the basis of the document by N.
  • the structure of the MIMO transmission system according to the first embodiment shows the degradation of the characteristics of a packet error rate by about 1.5 dB as compared with the conventional structure (outlined rhombuses).
  • the processing speed required for each decoder and deinterleaver on the reception side can be reduced to 1 ⁇ 4, so that processing delay in the decoder and deinterleaver can be reduced to 1 ⁇ 4.
  • the structure of the MIMO transmission system according to the second embodiment (black squares) is capable of reducing the processing speed required for each decoder on the reception side to 1 ⁇ 4 as compared with the conventional structure (outlined rhombuses). Also, the structure of the MIMO transmission system according to the second embodiment is capable of controlling the degradation of the characteristics of a packet error rate within 0.5 dB relative to the conventional structure in accordance with the improved characteristics due to a space interleaving effect.
  • the structure of the MIMO transmission system according to the third embodiment (black circles) is capable of reducing the amount of processing required for each deinterleaver on the reception side to 1 ⁇ 4 as compared with the conventional structure (outlined rhombuses). Also, the structure of the MIMO transmission system according to the third embodiment is capable of gaining substantially the same characteristics of a packet error rate as that of the conventional structure.
  • the number of antennas on the transmission side and the number of antennas on the reception side are the same.
  • the present invention is not limited to the same number of antennas but may employ different numbers of antennas on the transmission side and the reception side.
  • a transmitter changes the transmission rate in response to the reception status of radio waves in a receiver and the transmitter selects and uses an appropriate channel encoding/interleaving method in accordance with the change.
  • the information bit rate of the error-correcting encoding process and the error-correcting decoding process can be reduced to one Nth and the size of the interleaver and the deinterleaver can be reduced.
  • the work load in terms of the apparatus structure is most reduced.
  • the information bit rate of the error-correcting encoding process and the error-correcting decoding process can be reduced to one Mth. Also, a diversity effect using the transmission antennas can be obtained to a certain extent by performing the interleaving across the transmission antennas. However, there is a disadvantage in that the size of the interleaven is increased as compared with the first embodiment.
  • the size of the interleaver and the deinterleaver can be reduced. Also, optimum reception characteristics in the aforementioned embodiments can be obtained due to the space diversity effect.
  • the error-correcting encoding and the error-correcting decoding must be processed at the speed of the information bit rate.
  • the above-mentioned three embodiments each has a trade-off between merits and demerits.
  • the above-mentioned three embodiments are switched and used in accordance with the transmission rate.
  • the transmission rate is low (400 Mbps, for example)
  • the amount of processing does not have a great influence
  • the third embodiment is used so as to obtain the optimum reception characteristics.
  • the transmission rate is high (1 Gbps, for example)
  • the amount of processing has a great influence
  • the second embodiment is used so as to reduce the work load on the apparatus even at the sacrifice of the reception characteristics to a certain extent.
  • the reception status is good and the reception quality does not have a great influence while the apparatus structure is limited, the first embodiment can be used.
  • the transmission rate is changed in accordance with the reception status of radio waves in the receiver. Then the channel encoding/interleaving method is selected and used in accordance with the transmission rate.
  • information about the processing capacity of the receiving station is used as the transmission control information in addition to the reception status of radio waves. The transmission rate is changed in accordance with the reception status and the processing capacity, and the channel encoding/interleaving method is selected and used in accordance with the transmission rate.
  • FIG. 7 is a block diagram of a transmitter for performing the control method according to the fourth and fifth embodiments.
  • a control information demodulating unit 760 of a transmitter 710 receives and demodulates signals regarding the reception status of radio waves in the receiver and the processing capacity of the receiver (an example-of the transmission control information).
  • the modulated transmission control information is supplied to a transmission rate and structure determining unit 762 .
  • the transmission rate and structure determining unit 762 determines the transmission rate of transmission signals and which structure of the channel encoding/interleaving method is to be used.
  • the determined information is sent to a control information multiplexing unit 768 , multiplexed with transmission data, and transmitted to the receiver.
  • the determined information about which structure of the channel encoding/interleaving method is to be used is supplied to a switching control unit 764 .
  • the switching control unit 764 switches each of switches a, b, and c in accordance with the determined information.
  • the switch a selects whether to perform the error-correcting encoding on the transmission information in a parallel manner.
  • the switches b and c select whether to interleave the information encoded with error-correcting codes in a parallel manner or in a serial manner.
  • FIG. 8 is a block diagram of a receiver for performing the control method according to the fourth and fifth embodiments.
  • a reception status estimating unit 862 of a receiver 840 measures or estimates the reception status of the receiver and the result is transmitted to the transmitter 710 via a transmission unit.
  • a control information demodulating unit 860 of the receiver 840 receives and demodulates the reception control information about the transmission rate and the channel encoding/interleaving method transmitted from the transmitter. The demodulated information is supplied to a switching control unit 864 .
  • the switching control unit 864 switches each of switches d, e, and f in accordance with the demodulated information.
  • the switch d is for selecting whether to deinterleave received information in a parallel manner or in a serial manner.
  • the switch d corresponds to the operations of the switches b and c of the transmitter.
  • the switches e and f are switches for selecting whether to perform the error-correcting decoding process in a parallel manner or in a serial manner.
  • the switches e and f correspond to the operation of the switch a of the transmitter.
  • the transmitter, the receiver, and the transmission system according to the present invention can be applied to a high-speed radio communication system such as WCDMA, and can also be used in radio communication fields without imposing an excessive work load on devices in a transmitter and a receiver, in which high-speed transmission with a low error rate is required.
  • a high-speed radio communication system such as WCDMA

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Radio Transmission System (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Error Detection And Correction (AREA)
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