WO2015000306A1 - Procédé d'estimation de voie, appareil, et dispositif de communication - Google Patents

Procédé d'estimation de voie, appareil, et dispositif de communication Download PDF

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Publication number
WO2015000306A1
WO2015000306A1 PCT/CN2014/072412 CN2014072412W WO2015000306A1 WO 2015000306 A1 WO2015000306 A1 WO 2015000306A1 CN 2014072412 W CN2014072412 W CN 2014072412W WO 2015000306 A1 WO2015000306 A1 WO 2015000306A1
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Prior art keywords
receiving
channel estimation
antenna
subcarrier
phase
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PCT/CN2014/072412
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English (en)
Chinese (zh)
Inventor
黄煌
林伟
严茜
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华为技术有限公司
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    • 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
    • H04L25/0202—Channel estimation
    • H04L25/0204—Channel estimation of multiple channels
    • 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
    • H04L25/0202—Channel estimation
    • H04L25/022—Channel estimation of frequency response
    • 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
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2657—Carrier synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2662—Symbol synchronisation
    • H04L27/2663—Coarse synchronisation, e.g. by correlation
    • 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
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2668—Details of algorithms
    • H04L27/2673—Details of algorithms characterised by synchronisation parameters
    • H04L27/2675—Pilot or known symbols

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a channel estimation processing method, apparatus, and communication device. Background technique
  • MIM0 technology can fully develop space resources, realize multiple transmission and reception with multiple antennas, and multiply channel capacity without increasing spectrum resources and antenna transmission power.
  • the sub-carriers of the OFDM system are orthogonal to each other, and the spectrum resources can be efficiently utilized, and the adverse effects caused by multipath effects and frequency selective fading can be overcome.
  • the MIM0-0FDM technology which effectively combines the two, achieves high reliability of signal transmission while improving system capacity and spectrum utilization. Therefore, MIM0-0FDM has become the mainstream technology of current wireless communication.
  • phase noise and frequency offset due to its orthogonal multi-carrier characteristics.
  • introduction of multiple antennas results in channel estimation between antennas that is also more difficult than single antenna systems, especially in the presence of phase noise and frequency offset.
  • the source of RF noise for phase noise and frequency offset is mainly generated by the oscillator, and the higher the oscillator frequency, the more severe the distortion.
  • the output of an ideal oscillator with a frequency of /() is:
  • a(t) cos (2 ⁇ f 0 t + 2 ⁇ + ⁇ )) where is the frequency offset, phase noise ⁇ ⁇ is a stochastic process.
  • phase noise and frequency offset compensation methods are very important.
  • the channel estimation of the system is closely related to the signal phase noise and frequency offset compensation method. People often need to jointly design and optimize.
  • the existing joint channel estimation and phase compensation methods consider the case of the transmitting and receiving antenna eutectic (common source), that is, the common source between the transmitting antennas and the common source of the receiving antennas.
  • the transmitting and receiving antenna eutectic common source
  • the single-sided non-cosource between the antennas such as the common source of the transmitting antenna, the receiving antenna is not common source, or the transmitting antenna is not common source, and the receiving antenna is common source communication, the prior art cannot effectively reduce Phase noise and frequency offset effects. Summary of the invention
  • the invention provides a channel estimation processing method, device and communication device, which can effectively reduce phase noise and frequency offset effects.
  • a first aspect of the present invention provides a phase compensation processing method, including:
  • each receiving antenna Obtaining, by each receiving antenna, a received signal of at least one first pilot subcarrier in a channel estimation preamble sequence that is simultaneously transmitted by multiple transmitting antennas, where the received signal is calculated according to a non-co-source phase noise factor of different receiving antennas, wherein the plurality of transmitting antennas are common sources, and the receiving antennas are not common sources;
  • the received signal of the frequency subcarrier acquires a phase offset parameter of each receiving antenna when receiving the data symbol
  • the receiving signals of the at least one first pilot subcarrier in the channel estimation preamble simultaneously transmitted by the plurality of transmitting antennas from the respective receiving antennas include:
  • w is the number of receiving antennas
  • M is the number of transmitting antennas
  • z is the first channel preamble
  • the common source phase offset is straight
  • ( z ) is the first pilot subcarrier, and respectively represents inter-carrier interference and channel noise
  • H represents the channel estimation matrix when the channel estimation preamble sequence is received.
  • the obtaining, according to the received signal of the at least one first pilot subcarrier, the phase offset parameters of each receiving antenna when receiving the channel estimation preamble sequence includes:
  • n ⁇ ,...,N,
  • the channel estimation matrix obtained when acquiring the data symbols according to the phase offset parameter of each receiving antenna when receiving the pilot carrier includes:
  • H receives the data symbol Channel estimation parameters for the first data subcarrier.
  • the phase compensation for the received data subcarriers includes:
  • ['] ⁇ is the conjugate transpose operator of the matrix, which is the second data subcarrier in the first digital symbol transmitted by the wth antenna, indicating the phase offset value of each receiving antenna when receiving the data symbol.
  • a second aspect of the present invention provides another phase compensation processing method, including:
  • the transmitting antennas are not common sources, and the respective receiving antennas are common sources;
  • the received signals of the sub-carriers in the channel estimation preamble sequence obtained by acquiring the plurality of transmit antennas from each of the receiving antennas include
  • w represents the wth channel preamble sequence
  • y km is the received signal of the "receiving antenna
  • n ⁇ '', ⁇ is the number of receiving antennas
  • ⁇ w is the common source phase noise at the receiving antenna
  • w is the The non-common source phase noise factor of w transmit antennas
  • m M
  • M is the number of transmit antennas, which is the kth subcarrier in the wth channel preamble sequence
  • ICI 'and ⁇ ' indicate inter-carrier interference and channel noise, respectively.
  • ⁇ denotes the channel estimation matrix when receiving the channel estimation preamble sequence.
  • the foregoing receiving channel estimation matrix of each subcarrier in the preamble sequence according to the channel estimation includes:
  • phase offset parameters obtained by acquiring the subcarriers of the data symbols according to the channel estimation matrix are:
  • ⁇ ⁇ (1) ⁇ ⁇ (1) - ⁇ ⁇ ( ⁇ ) + ⁇ (1) where represents the first data symbol transmitted by the transmitting antenna.
  • phase offset parameters according to the respective transmit antennas when transmitting the data symbol subcarriers, and the phase estimation matrix of the received signal are included: ⁇ l
  • the signal representing the ⁇ th subcarrier in the data symbol transmitted by the wth transmitting antenna indicates the first subcarrier in the data symbol received by the "receiving antenna"
  • the signal, the conjugate transpose operator of the matrix represents the channel estimation matrix when the data symbols are received.
  • a third aspect of the present invention provides a phase compensation processing apparatus, including:
  • a first acquiring module configured to acquire, from each receiving antenna, a received signal of at least one first pilot subcarrier in a channel estimation preamble sequence that is simultaneously sent by multiple transmitting antennas, where the received signal is not according to different receiving antennas
  • the source phase noise factor is calculated, wherein the plurality of transmit antennas are common sources, and the respective receive antennas are not common sources;
  • a second acquiring module configured to acquire, according to the received signal of the at least one first pilot subcarrier, a phase offset parameter of each receiving antenna when receiving a channel estimation preamble sequence, and receive a pilot according to each receiving antenna a phase offset parameter at the time of carrier acquisition acquires a channel estimation matrix when receiving a data symbol;
  • a third acquiring module configured to acquire, according to a non-co-source phase noise factor of different receiving antennas, a received signal of the second pilot subcarrier in the data symbol, and the received signal is calculated according to a non-co-source phase noise factor of different receiving antennas, and according to Receiving signals of the at least one second pilot subcarrier acquire phase offset parameters of each receiving antenna when receiving data symbols;
  • a first phase compensation module configured to perform phase compensation on the received data subcarrier according to a phase offset parameter of each of the receiving antennas when receiving the data symbol, and a channel estimation matrix when receiving the data symbol.
  • the receiving, by the first acquiring module, the at least one first pilot subcarrier in the channel estimation preamble sequence that is simultaneously sent by the multiple receiving antennas from each receiving antenna includes:
  • w is the number of receiving antennas
  • M is the number of transmitting antennas
  • z is the first channel preamble sequence
  • i i, . . . , n , y ⁇ k
  • i i, . . . , n , y ⁇ k
  • i i, . . . , n , y ⁇ k
  • i i, . . . , n , y ⁇ k
  • i i, . . . , n , y ⁇ k
  • ⁇ W is the common source phase offset value of the transmitting antenna, which is the kth
  • the pilot subcarriers, and ⁇ represent inter-carrier interference and channel noise, respectively
  • H represents the channel estimation matrix when the channel estimation preamble sequence is received.
  • phase offset parameters of each receiving antenna when receiving the channel estimation preamble sequence according to the received signal of the at least one first pilot subcarrier including: s ( /)Hcca
  • H e H: ⁇ H
  • n ⁇ , . . . , N
  • w l" .., M.
  • the foregoing third obtaining module acquires a channel estimation matrix packet when receiving data symbols according to phase offset parameters of each receiving antenna at a pilot subcarrier.
  • H receives the data symbol Channel estimation parameters for the first data subcarrier.
  • the phase compensation of the received data subcarrier by the first phase compensation module includes:
  • N T is a conjugate transpose operator of the matrix
  • W is the second data subcarrier in the first digital symbol transmitted by the wth antenna, and represents a phase offset value of each receiving antenna when receiving the data symbol.
  • a fourth aspect of the present invention provides another phase compensation processing apparatus, including:
  • a fourth acquiring module configured to acquire, from each receiving antenna, a received signal of each subcarrier in a channel estimation preamble sequence that is sent by multiple transmit antennas, and the received signal is calculated according to a non-co-source phase noise factor of different transmit antennas Obtaining, wherein transmitting the plurality of transmitting antennas is not common source, and each receiving antenna is common source; a fifth acquiring module, configured to acquire a channel estimation matrix according to the received signal of each subcarrier in the channel estimation preamble sequence;
  • a second phase compensation module configured to perform phase compensation on the received signal according to a phase offset parameter of each of the transmitting antennas when transmitting a subcarrier of the data symbol, and the channel estimation matrix.
  • the fourth obtaining module obtains, by each of the receiving antennas, the plurality of transmitting antennas, and the sub-carriers in the channel estimation preamble sequence that are sent by the time-division:
  • w is the wth channel preamble sequence, which is the received signal of the "receiving antenna, ⁇ ⁇ '', ⁇ , is the number of receiving antennas, ⁇ w is the common source phase noise at the receiving antenna, and w is the wth
  • the non-co-source phase noise factor of the transmitting antenna, m , , M , M is the number of transmitting antennas, ⁇ is the kth subcarrier in the wth channel preamble sequence, and ICI ! and respectively represent inter-carrier interference and channel noise, ⁇ denotes a channel estimation matrix when receiving a channel estimation preamble sequence.
  • the foregoing fifth obtaining module acquires the channel estimation matrix according to the received signals of each subcarrier in the channel estimation preamble sequence, including:
  • the foregoing sixth obtaining module acquires, according to the channel estimation matrix, a phase offset parameter of each transmitting antenna when transmitting a subcarrier of the data symbol, where: the first data symbol sent by the transmitting antenna is represented by: .
  • the second phase compensation module performs phase compensation on the received signal according to the phase offset parameter of each transmit antenna when transmitting the subcarrier of the data symbol, and the channel estimation matrix includes: ⁇ l
  • a fifth aspect of the present invention provides a communication device, including:
  • a receiving antenna configured to receive a signal transmitted by the transmitting antenna, where the multiple transmitting antennas are common sources, and the receiving antennas are not common sources;
  • a processor configured to acquire, from each receiving antenna, a received signal of at least one first pilot subcarrier in a channel estimation preamble sequence simultaneously transmitted by multiple transmit antennas, where the received signal is a non-co-source phase according to different receiving antennas And obtaining, according to the received signal of the at least one first pilot subcarrier, a phase offset parameter of each receiving antenna when receiving the channel estimation preamble sequence, and according to the receiving antenna when receiving the pilot subcarrier
  • the phase offset parameter acquires a channel estimation matrix when receiving the data symbols; and acquires, by each receiving antenna, a received signal of at least one second pilot subcarrier in the data symbol, the received signal being a non-common source according to different receiving antennas
  • the phase noise factor is calculated, and the phase offset parameter of each receiving antenna when receiving the data symbol is obtained according to the received signal of the at least one second pilot subcarrier; and the phase offset of each receiving antenna when receiving the data symbol
  • the shift parameter, and the channel estimation matrix when receiving the data symbol are received According to a subcar
  • the receiving, by the processor, acquiring, by each of the receiving antennas, the received signals of the at least one first pilot subcarrier in the channel estimation preamble sequence simultaneously transmitted by the multiple transmitting antennas includes:
  • n is the received signal of the "receiving antenna
  • ⁇ W is the common source phase offset value of the transmitting antenna
  • ( ⁇ ) is the first pilot subcarrier
  • ⁇ represents inter-carrier interference and channel noise, respectively
  • H represents the channel estimation matrix when the channel estimation preamble sequence is received.
  • the foregoing processor according to the received signal of the at least one first pilot subcarrier, acquires phase offset parameters of each receiving antenna when receiving the channel estimation preamble sequence, including:
  • the channel estimation matrix when the processor obtains the received data symbol according to the phase offset parameter of each receiving antenna when receiving the pilot subcarrier includes:
  • H receives the data symbol Channel estimation parameters for the first data subcarrier.
  • the processor performs phase compensation on the received data subcarriers including:
  • ['] ⁇ is the conjugate transpose operator of the matrix, which is the second data subcarrier in the first digital symbol transmitted by the wth antenna, indicating the phase offset value of each receiving antenna when receiving the data symbol.
  • a sixth aspect of the present invention provides another communication device, including:
  • a receiving antenna configured to receive a signal transmitted by the transmitting antenna, where the multiple transmitting antennas are not common, and the receiving antennas are common;
  • a processor configured to obtain, from each receiving antenna, a received signal of each subcarrier in a channel estimation preamble sequence that is sent by multiple transmit antennas, and the received signal is calculated according to a non-co-source phase noise factor of different transmit antennas; Acquiring a channel estimation matrix according to the received signal of each subcarrier in the channel estimation preamble sequence; acquiring, according to the channel estimation matrix, a phase offset parameter of each transmitting antenna when transmitting a subcarrier of the data symbol; according to each of the transmitting antennas Send the symbol of the data symbol The phase offset parameter of the wave time, and the channel estimation matrix phase compensate the received signal.
  • the foregoing processor obtains, by each of the receiving antennas, the receiving of each subcarrier in the channel estimation preamble sequence that is sent by multiple transmitting antennas in time division:
  • the kth subcarrier in the pilot sequence W ICI !, the common source phase noise at the receiving antenna, W is the non-co-source phase noise factor of the wth transmit antenna, M , M is the number of transmit antennas, ⁇ is the wth
  • W is the non-co-source phase noise factor of the wth transmit antenna
  • M is the number of transmit antennas
  • ⁇ is the wth
  • the pre-channel sums represent inter-carrier interference and channel noise, respectively, and ⁇ denotes the channel estimation matrix when the channel estimation preamble sequence is received.
  • the foregoing processor acquiring the channel estimation matrix according to the received signal of each subcarrier in the channel estimation preamble sequence includes:
  • the foregoing processor obtains, according to the channel estimation matrix, a phase offset parameter of each transmit antenna when transmitting a subcarrier of the data symbol, where: the first data symbol sent by the transmit antenna is represented by the transmit antenna.
  • the foregoing processor performs phase compensation on the received signal according to the phase offset parameter of each transmit antenna when transmitting the subcarrier of the data symbol, and the channel estimation matrix includes:
  • the signal indicating the first subcarrier in the data symbol transmitted by the wth transmitting antenna indicates the signal of the ⁇ th subcarrier in the data symbol received by the "receiving antenna", and ['] ⁇ is the conjugate transpose operator of the matrix , indicates the channel estimation matrix when receiving data symbols.
  • the present invention provides a channel estimation processing method, apparatus, and communication device, wherein a common source of the transmitting antenna, a receiving antenna is not common source, or a transmitting antenna is not common source, and a single-sided common source communication scenario of the receiving antenna is common, Obtaining a phase offset parameter of each receiving antenna when receiving the data symbol, and performing, according to the phase offset parameter of each receiving antenna when receiving the data symbol, and the channel estimation matrix when receiving the data symbol, performing the received data subcarrier Phase compensation, or obtaining a phase offset parameter of each transmitting antenna when transmitting a subcarrier of the data symbol, according to a phase offset parameter of each transmitting antenna when transmitting a subcarrier of the data symbol, and the channel estimation matrix pair
  • the received signal is phase compensated, which can effectively reduce the phase noise and frequency offset effects.
  • FIG. 1 is a schematic flowchart 1 of a phase compensation processing method according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram 1 of a transmitting signal of a transmitting antenna according to an embodiment of the present invention
  • FIG. 3 is a second schematic flowchart of a phase compensation processing method according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of a subcarrier in an embodiment of the present invention.
  • FIG. 5 is a second schematic diagram of a transmitting signal of a transmitting antenna according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram 3 of a transmitting signal of a transmitting antenna according to an embodiment of the present invention.
  • FIG. 7 is a schematic diagram 1 of performance comparison between an embodiment of the present invention and a prior art
  • FIG. 8 is a second schematic diagram of performance comparison between an embodiment of the present invention and the prior art
  • FIG. 9 is a schematic structural diagram 1 of a phase compensation processing apparatus according to an embodiment of the present invention.
  • FIG. 10 is a second schematic structural diagram of a phase compensation processing apparatus according to an embodiment of the present invention. detailed description
  • the embodiment of the present invention sends a channel preamble sequence in a corresponding manner for the Tx common source, the Rx non-common source, the Tx non-co-source, and the Rx common source, and uses corresponding channels.
  • the estimation method obtains channel estimation values whose phases are compensated for the respective common source conditions of the antenna, and combines channel estimation and phase tracking, and for inaccurate channel estimation values including phase noise, according to the respective antenna common source conditions in the signal detection phase
  • the phase tracking and compensation are further performed to obtain a more accurate phase compensation value, which can make the transmission data detection more accurate when the antenna side is not common, and effectively improve the BER performance of the system.
  • FIG. 1 is a schematic flowchart 1 of a phase compensation processing method according to an embodiment of the present invention. As shown in FIG. 1, the method includes the following steps:
  • Step 101 Acquire, from each receiving antenna, a received signal of at least one first pilot subcarrier in a channel estimation preamble sequence that is simultaneously sent by multiple transmitting antennas, where the received signal is a non-co-source phase noise according to different receiving antennas. The factor is calculated, wherein the plurality of transmitting antennas are common sources, and the receiving antennas are not common sources;
  • the transmitting antenna performs signal transmission according to FIG. 2, and a pilot subcarrier is inserted in each channel estimation preamble sequence, and FIG. 2 is two.
  • the transmit antennas Tx1 and Tx2, the two channel estimation preamble sequences, that is, the first channel estimation preamble sequence and the second channel estimation preamble sequence are taken as examples.
  • the system has one transmit antenna and W receive antennas.
  • Step 102 The received signal of the at least one first pilot subcarrier acquires a phase offset parameter of each receiving antenna when receiving a channel estimation preamble sequence, and receives a pilot subcarrier according to each receiving antenna.
  • the phase offset parameter of the time obtains the channel estimation matrix when the data symbol is received.
  • the LS algorithm is used.
  • Step 103 Obtain, from each receiving antenna, a received signal of at least one second pilot subcarrier in a data symbol, where the received signal is calculated according to a non-co-source phase noise factor of different receiving antennas, and according to the at least The received signal of a second pilot subcarrier acquires a phase offset parameter of each receiving antenna when receiving the data symbol;
  • the first data subcarriers of the received signal are combined by space-time coding, and:
  • each of the receiving antennas in ⁇ is compensated by the calculated N phase offset values, and the existing The phase offset compensation values for each receive antenna are the same in the technique.
  • the channel parameters of the first data subcarrier can be estimated as: That is, through the above steps, the channel estimation matrix when the data symbols are received is obtained according to the phase offset parameter of each receiving antenna when receiving the pilot subcarriers.
  • both and ⁇ refer to terms in the channel estimation matrix, except that the former refers to the data subcarrier portion, and the latter refers to the frequency subcarrier portion.
  • Step 104 Perform phase compensation on the received data subcarrier according to a phase offset parameter of each receiving antenna when receiving a data symbol, and a channel estimation matrix when receiving the data symbol.
  • the first pilot subcarrier in the / ( ) OFDM symbol can be used to estimate
  • the pilot or data subcarrier (/) is the same.
  • FIG. 3 is a schematic flowchart of a phase compensation processing method according to an embodiment of the present invention. As shown in FIG. 3, the method includes the following steps:
  • Step 201 Acquire, from each receiving antenna, a received signal of each subcarrier in a channel estimation preamble sequence that is sent by multiple transmit antennas, and the received signal is calculated according to a non-co-source phase noise factor of different transmit antennas, where Transmitting the plurality of transmitting antennas is not common source, and each receiving antenna is common source;
  • the system has M transmit antennas and N receive antennas, so that the wth transmit antennas transmit a channel preamble sequence at time m, and the kth subcarriers in the mth channel preamble sequence are received from the respective receive antennas.
  • the received signals of each subcarrier in the channel estimation preamble sequence obtained by acquiring multiple transmit antennas in time division include:
  • the phase noise factor, m M
  • ⁇ is the first subcarrier in the wth signal preamble sequence
  • ⁇ ' denotes inter-carrier interference and channel noise, respectively
  • ⁇ denotes the channel estimation matrix when receiving the channel estimation preamble sequence.
  • Step 202 Obtain a channel estimation matrix according to a received signal of each subcarrier in the channel estimation preamble sequence, and acquire, according to the channel estimation matrix, a phase offset parameter of each transmit antenna when transmitting a subcarrier of the data symbol;
  • the LS algorithm is used for the first subcarrier in the wth channel preamble sequence.
  • Step 203 phase offset parameters according to the respective transmit antennas when transmitting subcarriers of data symbols, and the channel estimation matrix pair Receive signals for phase compensation.
  • the first pilot subcarrier in the / (/>M) OFDM symbol can be used to estimate
  • the detection signal can be obtained by using the LS method:
  • ⁇ is the conjugate transpose operator of the matrix
  • each transmit antenna is compensated by its own phase offset value
  • the phase offset compensation values of all antennas in the prior art are the same, indicating the received data symbol
  • the channel estimation matrix at the time, which is the above calculated ⁇ , the superscript d indicates that only the data subcarriers are processed during the compensation.
  • the channel estimation preamble sequence is shown in Figure 5.
  • the value of each item in the preamble sequence is 1 or -1.
  • pilot subcarriers are inserted in each channel estimation preamble sequence, and the number of pilot subcarriers is consistent with the number of pilot subcarriers in the payload OFDM data symbols.
  • step 102 for the first pilot subcarrier in the first channel preamble sequence, according to step 102 in the embodiment shown in FIG.
  • the channel parameters of the first data subcarrier can be estimated as:
  • the load OFDM symbol parameter setting can be seen in FIG. 4, that is, the number of subcarriers per OFDM symbol is 64, and the load after the channel preamble sequence
  • the number of subcarriers per OFDM symbol is 64
  • the load after the channel preamble sequence There are 52 useful subcarriers in the OFDM symbol, and the 0th to 5th and 59th to 63th subcarriers and the 32nd DC subcarrier are null subcarriers.
  • 8 subcarriers P e ⁇ 10, 13, 22, 25, 39, 42, 51, 54 ⁇ are pilot subcarriers.
  • the channel estimation preamble sequence is as shown in FIG. 6. Wherein, -1, 1 ⁇ , and at this time, the pilot subcarrier is not inserted in the channel estimation preamble sequence.
  • step 202 in the embodiment shown in FIG. 2 for the first subcarrier in the two channel preamble sequences,
  • phase compensation is performed on the first data subcarrier in the / (/ > 2) OFDM symbols on the receiving antenna.
  • the technical solution provided by the foregoing embodiments of the present invention can be applied to various communication systems based on the MIM0-0FDM technology.
  • For communication systems with wide bandwidth, high frequency and high transmission rate, phase noise and frequency offset The impact is extremely serious.
  • a low complexity method is proposed to compensate for signal distortion caused by phase noise and frequency offset by jointly optimizing channel estimation and phase tracking. Thereby the bit error bit rate is greatly reduced.
  • Figure 7 shows a comparison of the BER performance of the channel estimation and phase compensation algorithm of the present invention with prior art algorithms in the case of Tx common source, Rx not common source.
  • the specific parameters of the communication system can be set as follows: 2x2 MIM0 technology, 128 subcarriers per OFDM symbol, 8 subcarriers are pilot signals, the signal is 64QAM modulation, and the channel is Additive White Gaussian Noise (Additive White Gaussian Noise, Hereinafter referred to as: AWGN, the system frequency offset is 2ppm, and its Wiener phase noise is -80dB@100kHz, that is, the phase noise is _80dB when the frequency offset is 100kHz.
  • AWGN Additive White Gaussian Noise
  • Figure 8 shows a comparison of the BER performance of the channel estimation and phase compensation algorithm of the present invention with prior art algorithms in the case where Tx is not common source, Rx common source.
  • Tx is not common source
  • Rx is common source
  • the prior art scheme is adopted, where the bit error bit rate (BER) varies with the signal to noise ratio (SNR).
  • the joint channel estimation Rx is not the case with the common source phase compensation scheme in which the bit error rate (BER) with the ratio (SNR) is increased significantly decreased, the value of signal to noise ratio approaches 30, the bit error rate is reduced to about 10-4.
  • BER bit error rate
  • SNR ratio
  • FIG. 9 is a schematic structural diagram 1 of a phase compensation processing apparatus according to an embodiment of the present invention.
  • the method includes a first acquiring module 11, a second acquiring module 12, a third acquiring module 13, and a first phase compensating module 14,
  • the first obtaining module 11 is configured to obtain, from each receiving antenna, a received signal of at least one first pilot subcarrier in a channel estimation preamble sequence that is simultaneously sent by multiple transmitting antennas, where the received signal is not according to different receiving antennas.
  • the common source phase noise factor is calculated, wherein the plurality of transmit antennas are common sources, and the respective receive antennas are not common source; the second obtaining module 12 is configured to obtain each according to the received signals of the at least one first pilot subcarrier.
  • the received signal of the carrier acquires a phase offset parameter of each receiving antenna when receiving the data symbol;
  • the first phase compensation module 14 is configured to: according to the phase offset parameter of each receiving antenna when receiving the data symbol, and when receiving the data symbol
  • the channel estimation matrix performs phase compensation on the received data subcarriers.
  • phase offset parameters of each receiving antenna when receiving data symbols can be obtained, and the received values of each receiving antenna are respectively compensated by respective phase offset values, which can effectively reduce the prior art.
  • Phase noise and frequency offset effects in the case of Tx common source and Rx not common source are respectively compensated by respective phase offset values, which can effectively reduce the prior art.
  • the first acquiring module is specifically configured to: obtain, by using the receiving antennas, the received signals of the at least one first pilot subcarrier in the channel estimation preamble sequence simultaneously transmitted by the multiple receiving antennas, including:
  • the third obtaining module 13 obtains the channel estimation matrix when the received data symbols are obtained according to the phase offset number of each receiving antenna when receiving the pilot subcarriers, including: Wherefeld(1) is the phase offset parameter caused by the common phase offset of the transmitting antenna and the phase offset of the receiving antenna n for the first channel preamble symbol, which is a positive integer, H receives the data symbol Channel estimation parameters for the first data subcarrier.
  • the phase compensation of the received data subcarrier by the first phase compensation module 14 includes:
  • [ '] ⁇ is the conjugate transpose operator matrix
  • ⁇ ⁇ ⁇ represents a phase of each receiving antenna when receiving data symbols Offset value.
  • the apparatus includes a fourth acquiring module 21, a fifth obtaining module 22, a sixth obtaining module 23, and a second phase compensating module. 24, wherein the fourth obtaining module 21 is configured to obtain, from each receiving antenna, a received signal of each subcarrier in a channel estimation preamble sequence that is sent by multiple transmit antennas, and the received signal is a non-co-source phase according to different transmit antennas.
  • the noise factor is calculated, wherein the transmitting the plurality of transmitting antennas is not common source, and the receiving antennas are common sources; and the fifth obtaining module 22 is configured to obtain a channel estimation matrix according to the received signals of each subcarrier in the channel estimation preamble sequence.
  • the sixth obtaining module 23 is configured to acquire a phase offset parameter of each transmitting antenna when transmitting a subcarrier of the data symbol according to the channel estimation matrix; and the second phase compensation module 24 is configured to send the data symbol according to the each transmitting antenna. Phase offset parameter for subcarriers, and phase estimation of the received signal by the channel estimation matrix .
  • phase offset values are respectively calculated for different transmitting antennas, and the corresponding phase compensation is performed, which can effectively reduce the phase in the case where the common source and the Rx are not common sources in the prior art. Noise and frequency offset effects.
  • the fourth acquisition module 21 acquires, by each of the receiving antennas, the received signals of the sub-carriers in the channel estimation preamble sequence that are time-divisionally transmitted by the multiple transmit antennas, including:
  • the fifth obtaining module 22 obtains the channel estimation matrix according to the received signal of each subcarrier in the channel estimation preamble sequence, including:
  • the sixth obtaining module acquires phase offset parameters of each transmitting antenna when transmitting the subcarriers of the data symbols according to the channel estimation matrix, including:
  • the second phase compensation module performs phase compensation on the received signal according to the phase offset parameter of each transmit antenna when transmitting the subcarrier of the data symbol, and the channel estimation matrix includes:
  • the signal indicating the ⁇ th subcarrier in the data symbol transmitted by the wth transmitting antenna indicates the signal of the first subcarrier in the data symbol received by the receiving antenna
  • the conjugate transpose operator of the matrix indicates the receiving data symbol Time channel estimation matrix
  • the embodiment of the invention further provides a communication device, the communication device comprising:
  • a receiving antenna configured to receive a signal transmitted by the transmitting antenna, where the multiple transmitting antennas are common sources, and the receiving antennas are not common sources;
  • a processor configured to obtain a channel estimate for simultaneous transmission of multiple transmit antennas from each receive antenna a received signal of at least one first pilot subcarrier in the preamble sequence, the received signal being calculated according to a non-co-source phase noise factor of different receiving antennas; acquiring according to the received signal of the at least one first pilot subcarrier a phase offset parameter of each receiving antenna when receiving a channel estimation preamble sequence, and acquiring a channel estimation matrix when receiving the data symbol according to a phase offset parameter of each receiving antenna when receiving the pilot subcarrier; from each receiving antenna Obtaining a received signal of at least one second pilot subcarrier in the data symbol, where the received signal is calculated according to a non-co-source phase noise factor of different receiving antennas, and according to the receiving of the at least one second pilot subcarrier And acquiring, by the signal, a phase offset parameter of each receiving antenna when receiving the data symbol; performing, according to the phase offset parameter of each receiving antenna when receiving the data symbol, and the channel estimation matrix when receiving the data symbol, performing the received data
  • the obtaining, by the processor, the received signals of the at least one first pilot subcarrier in the channel estimation preamble sequence that are simultaneously sent by the multiple transmit antennas from each of the receiving antennas includes:
  • the phase offset is straight, ⁇ ( ⁇ ) is the first pilot subcarrier, c ⁇ and respectively represent inter-carrier interference and channel noise, and H represents the channel estimation matrix when the channel estimation preamble sequence is received.
  • Obtaining, by the processor, the phase offset parameters of each receiving antenna when receiving the channel estimation preamble sequence according to the received signal of the at least one first pilot subcarrier includes:
  • the channel estimation matrix obtained by the processor according to the phase offset parameter of each receiving antenna when receiving the pilot subcarrier includes: Where heard(1) is the phase offset parameter caused by the common phase offset of the transmitting antenna and the phase offset of the receiving antenna n for the first channel preamble symbol, which is a positive integer, H receives the data symbol Channel estimation parameters for the first data subcarrier.
  • the processor performs phase compensation on the received data subcarriers including:
  • [ '] ⁇ conjugate transpose operator matrix the first digit symbols W th antenna transmission in a first ⁇ data subcarriers, ⁇ ⁇ ⁇ represents a phase of each receiving antenna when receiving data symbols Offset value.
  • the embodiment of the invention further provides another communication device, including:
  • a receiving antenna configured to receive a signal transmitted by the transmitting antenna, where the multiple transmitting antennas are not common, and the receiving antennas are common;
  • a processor configured to obtain, from each receiving antenna, a received signal of each subcarrier in a channel estimation preamble sequence that is sent by multiple transmit antennas, and the received signal is calculated according to a non-co-source phase noise factor of different transmit antennas; Acquiring a channel estimation matrix according to the received signal of each subcarrier in the channel estimation preamble sequence; acquiring, according to the channel estimation matrix, a phase offset parameter of each transmitting antenna when transmitting a subcarrier of the data symbol; according to each of the transmitting antennas A phase offset parameter when a subcarrier of the data symbol is transmitted, and the channel estimation matrix performs phase compensation on the received signal.
  • the above processor obtains channel estimation preambles for time division transmission of multiple transmit antennas from each receiving antenna
  • w denotes the wth channel preamble sequence, which is the received signal of the "receiving antenna”
  • ⁇ ⁇
  • ⁇ the number of receiving antennas
  • ⁇ w the common source phase noise at the receiving antenna
  • ⁇ the wth
  • M the number of transmitting antennas
  • ⁇ the kth subcarrier in the wth channel preamble sequence
  • ⁇ ⁇ ⁇ denotes inter-carrier interference and channel noise, respectively Acoustic
  • H represents the channel estimation matrix when receiving the channel estimation preamble sequence.
  • the foregoing processor obtains a channel estimation matrix according to a received signal of each subcarrier in the channel estimation preamble sequence, including:
  • ® ⁇ (1) ⁇ ⁇ (1) - ⁇ ⁇ ⁇ ) + ⁇ 1) where represents the first data symbol transmitted by the transmitting antenna.
  • the processor performs phase compensation on the received signal according to the phase offset of each transmit antenna when transmitting the subcarrier of the data symbol, and the channel estimation matrix includes:
  • the signal indicating the first subcarrier in the data symbol transmitted by the wth transmitting antenna indicates the signal of the ⁇ th subcarrier in the data symbol received by the "receiving antenna", and ['] ⁇ is the conjugate transpose operator of the matrix , indicates the channel estimation matrix when receiving data symbols.
  • the aforementioned program can be stored in a computer readable storage medium.
  • the program when executed, performs the steps including the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as ROM, RAM, disk or optical disk.

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Abstract

La présente invention concerne un procédé d'estimation de voie, un appareil, et un dispositif de communication. Un procédé de compensation de phase consiste : à obtenir, de diverses antennes de réception, un signal de réception d'au moins une première sous-porteuse de fréquence pilote dans des séquences de préambule d'estimation de voie transmises simultanément par une pluralité d'antennes de transmission; d'après le signal de réception de la ou des premières sous-porteuses de fréquence pilote, à obtenir les paramètres de décalage de phase des diverses antennes de réception durant la réception des séquences de préambule d'estimation de voie, et à obtenir une matrice d'estimation de voie durant la réception de symboles de données; à obtenir, des diverses antennes de réception, un signal de réception d'au moins une deuxième sous-porteuse de fréquence pilote dans les symboles de données, le signal de réception étant obtenu via des calculs exécutés d'après des facteurs de bruit de phase source non communs de différentes antennes de réception, et à obtenir les paramètres de décalage de phase des diverses antennes de réception durant la réception des symboles de données; et à exécuter une compensation de phase sur la sous-porteuse de données reçue d'après les paramètres de décalage de phase et de la matrice d'estimation de voie durant la réception des symboles de données. La solution technique de la présente invention peut réduire efficacement l'influence du bruit de phase et du décalage en fréquence.
PCT/CN2014/072412 2013-07-01 2014-02-22 Procédé d'estimation de voie, appareil, et dispositif de communication WO2015000306A1 (fr)

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