WO2015135217A1 - Procédé et dispositif de traitement de pilote pour réseau local sans fil, et système de communication - Google Patents

Procédé et dispositif de traitement de pilote pour réseau local sans fil, et système de communication Download PDF

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Publication number
WO2015135217A1
WO2015135217A1 PCT/CN2014/073476 CN2014073476W WO2015135217A1 WO 2015135217 A1 WO2015135217 A1 WO 2015135217A1 CN 2014073476 W CN2014073476 W CN 2014073476W WO 2015135217 A1 WO2015135217 A1 WO 2015135217A1
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WIPO (PCT)
Prior art keywords
pilot
wlan
subcarriers
frequency domain
total number
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PCT/CN2014/073476
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English (en)
Chinese (zh)
Inventor
刘亚林
朱俊
张佳胤
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201480076998.1A priority Critical patent/CN106105375B/zh
Priority to PCT/CN2014/073476 priority patent/WO2015135217A1/fr
Publication of WO2015135217A1 publication Critical patent/WO2015135217A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver

Definitions

  • Wireless local area network pilot processing method device and communication system
  • the present invention relates to communication technologies, and in particular, to a pilot processing method, apparatus, and communication system for a wireless local area network. Background technique
  • WLAN Wireless Local Area Networks
  • IEEE 802.11a/ g Institute of Electrical and Electronics Engineers
  • IEEE 802.11ac Institute of Electrical and Electronics Engineers
  • the IEEE 802.11 working group established the High Efficiency WLAN (HEW) learning group in 2013 to introduce Orthogonal Frequency Division Multiple Access (OFDM) in the WLAN.
  • HEW High Efficiency WLAN
  • OFDM Orthogonal Frequency Division Multiple Access
  • existing WLAN systems include IEEE 802.1 la-based legacy systems, IEEE 802.11 ⁇ -based High Throughput (HT) systems, and IEEE 802.1 lac-based Very High Throughput (VHT).
  • the system has a subcarrier spacing of 312.5 kHz (kiloHertz, kHz for short). That is, when the legacy system, the HT system, and the VHT system use a 20 MHz (MHz) bandwidth, the number of subcarriers is 64. When using 40MHz bandwidth, the number of subcarriers is 128. When using 80MHz and 160MHz bandwidth, the number of subcarriers is 256 and 512 respectively.
  • the IEEE 802.il series of standards specifies the usage and distribution of the subcarriers of the above WLAN system.
  • the 20 MHz bandwidth has a total of 64 subcarriers, including 4 pilot subcarriers and 48 data sub-carriers.
  • Carrier and 1 DC subcarrier, the remaining 11 subcarriers are used as protection bandwidth non-transmission information, and 4 pilot subcarriers are located at subcarriers-21, -7, 7 and 21, respectively.
  • the pilot symbols are continuous in the time domain. Placed, each symbol on the immediate domain has a pilot subcarrier.
  • the HEW learning group hopes to reduce the subcarrier spacing and increase the number of subcarriers based on the existing WLAN system, for example, the number of subcarriers in the 20 MHz bandwidth.
  • the number is increased to 128, 256, 512, or even 1024.
  • the number and distribution of pilots specified by the IEEE 802.11a or IEEE 802.11ac standard cannot be applied after the number of subcarriers is increased.
  • the WLAN system cannot eliminate the effects of residual frequency offset and phase noise generated by the system, and the placement of pilots in the time domain specified in IEEE 802.11ac/lla/llg/lln can make the system overhead too large, which is not conducive to improving the system. Throughput. Summary of the invention
  • the invention provides a pilot processing method, device and communication system for a wireless local area network, which can eliminate the influence of residual frequency offset and phase noise generated by the system, and effectively reduce the error packet rate.
  • the present invention provides a transmitting device, including:
  • a pilot number determining module configured to determine, in a frequency domain, a total number of pilot subcarriers in a WLAN WLAN;
  • a frequency domain deployment module configured to determine, according to the total number of the pilot subcarriers, a subcarrier number of the pilot that carries the pilot in the frequency domain;
  • a time domain deployment module configured to uniformly carry the pilot in a symbol of the WLAN in a time domain
  • a signal sending module configured to send a signal to the receiving end device according to the subcarrier serial number carrying the pilot and the symbol, so that the receiving end device acquires phase tracking information according to the pilot in the signal, The data in the signal is then phase compensated and demodulated.
  • the frequency domain deployment module is specifically configured to: according to the total number of the pilot subcarriers, in the frequency domain, Frequency-symmetric and evenly distributed on both sides of the DC subcarrier of the WLAN to determine the subcarrier number of the bearer carrying pilot; or
  • the pilot is uniformly deployed on the entire bandwidth of the WLAN according to the total number of the pilot subcarriers to determine the subcarrier number of the bearer.
  • the frequency domain deployment module is specifically configured to obtain the number of subcarriers of the WLAN compared to the Institute of Electrical and Electronics Engineers IEEE802.11ac/l a multiple of the number of subcarriers of the system having the same WLAN bandwidth as specified in la/llg/l ln; in the frequency domain, the IEEE 802.1 lac/ according to the total number of pilot subcarriers The system specified in 1 la/1 lg/1 In is the same as the WLAN bandwidth The subcarrier number of the pilot is increased by the multiple, and the subcarrier number carrying the pilot in the WLAN is obtained.
  • the bandwidth of the WLAN is 40 MHz
  • the pilot number determining module is specifically configured to determine in the frequency domain
  • the total number of pilot subcarriers in the WLAN is eight
  • the frequency domain deployment module is specifically configured to acquire, according to the total number of the pilot subcarriers, a 20 MHz bandwidth and the sub a system in which the number of carriers is half of the number of subcarriers of the WLAN, and the subcarrier number of the pilot is carried, and the subcarrier number of the pilot is expanded to obtain the half of the bandwidth of the WLAN.
  • the subcarrier number of the pilot is determined according to the subcarrier number of the pilot carrying the pilot according to the half bandwidth of the WLAN, and the subcarrier number carrying the pilot on the symmetric half bandwidth of the WLAN is determined.
  • the frequency domain deployment module is specifically configured to use, in the frequency domain, the IEEE 802 according to the total number of the pilot subcarriers.
  • the number of the subcarriers carrying the pilot in the WLAN, the number of the subcarrier numbers and the pilot in the number of 16 pilot subcarriers in the 160 MHz bandwidth system specified in .11ac The total number of subcarriers is equal, and the subcarrier numbers are evenly distributed over the entire bandwidth of the WLAN.
  • the time domain deployment module is specifically configured to be used in In the time domain, the pilot is carried on every at least one of the symbols on the symbol of the WLAN.
  • the time domain deployment module is specifically configured to use, in a time domain, on a symbol of the WLAN The pilot is carried by one or three of the symbols.
  • any one of the first to sixth possible implementation manners of the first aspect in a seventh possible implementation manner of the first aspect, if the WLAN bandwidth is 20 MHz, the subcarrier The number of pilots determining module is specifically configured to determine, in the frequency domain, that the total number of pilot subcarriers in the WLAN is four;
  • the frequency domain deployment module is specifically configured to determine, according to the total number of the pilot subcarriers, the subcarrier number of the pilot that carries the pilot in the WLAN as -42, -14, 14, 42.
  • any one of the first to sixth possible implementations of the first aspect in combination with the first aspect, any one of the first to sixth possible implementations of the first aspect, in an eighth possible implementation manner of the first aspect, if the WLAN bandwidth is 20 MHz, and the number of subcarriers is 256, the pilot number determining module is specifically configured to be in the frequency domain. Determining that the total number of pilot subcarriers in the WLAN is four;
  • the frequency domain deployment module is specifically configured to determine, according to the total number of the pilot subcarriers, the subcarrier numbers of the pilots carrying the pilots in the WLAN as -84, -28, 28, 84.
  • any one of the first to the sixth possible implementation manners of the first aspect in the ninth possible implementation manner of the first aspect, if the WLAN bandwidth is 20 MHz, the subcarrier The number of pilots is 512, and the pilot number determining module is specifically configured to determine, in the frequency domain, that the total number of pilot subcarriers in the WLAN is four;
  • the frequency domain deployment module is specifically configured to determine, according to the total number of the pilot subcarriers, the subcarrier numbers of the pilots carrying the pilots in the WLAN as -168, -56, 56, 168.
  • any one of the first to the sixth possible implementation manners of the first aspect in the tenth possible implementation manner of the first aspect, if the WLAN bandwidth is 20 MHz, the subcarrier The number of pilots is 1024, and the pilot number determining module is specifically configured to determine, in the frequency domain, that the total number of pilot subcarriers in the WLAN is four;
  • the frequency domain deployment module is specifically configured to determine, according to the total number of the pilot subcarriers, a subcarrier number of the pilot that carries the pilot in the WLAN as -336, -112, 112, 336.
  • any one of the first to the sixth possible implementation manners of the first aspect in the eleventh possible implementation manner of the first aspect, if the WLAN bandwidth is 40 MHz, the subcarrier The number of pilots is 256, and the pilot number determining module is specifically configured to determine, in the frequency domain, that the total number of pilot subcarriers in the WLAN is six;
  • the frequency domain deployment module is specifically configured to determine, according to the total number of the pilot subcarriers, the subcarrier number of the pilot that carries the pilot in the WLAN to be -106, -50, -22 , 22, 50, 106.
  • any one of the first to the sixth possible implementation manners of the first aspect in the twelfth possible implementation manner of the first aspect, if the WLAN bandwidth is 40 MHz, the subcarrier The number of pilots is 256, and the pilot number determining module is specifically configured to determine, in the frequency domain, that the total number of pilot subcarriers in the WLAN is eight;
  • the frequency domain deployment module is specifically configured to, according to the total frequency of the pilot subcarriers, in the frequency domain The number determines that the subcarrier numbers carrying the pilots in the WLAN are -106, -78, -50, -22, 22, 50, 78, 106.
  • any one of the first to the sixth possible implementation manners of the first aspect in the thirteenth possible implementation manner of the first aspect, if the WLAN bandwidth is 40 MHz, the subcarrier The number of pilots is 512, and the pilot number determining module is specifically configured to determine, in the frequency domain, that the total number of pilot subcarriers in the WLAN is six;
  • the frequency domain deployment module is specifically configured to determine, according to the total number of the pilot subcarriers, the subcarrier number of the pilot that carries the pilot in the WLAN to be -212, -100, -44. , 44, 100, 212.
  • any one of the first to the sixth possible implementation manners of the first aspect in the fourteenth possible implementation manner of the first aspect, if the WLAN bandwidth is 40 MHz, the subcarrier The number of pilots is 512, and the pilot number determining module is specifically configured to determine, in the frequency domain, that the total number of pilot subcarriers in the WLAN is eight;
  • the frequency domain deployment module is specifically configured to determine, according to the total number of the pilot subcarriers, the subcarrier number of the pilot that carries the pilot in the WLAN as -212, -156, -100. , —44, 44, 100, 156, 212.
  • any one of the first to sixth possible implementation manners of the first aspect in the fifteenth possible implementation manner of the first aspect, if the WLAN bandwidth is 40 MHz, the subcarrier The number of pilots is 1024, and the pilot number determining module is specifically configured to determine, in the frequency domain, that the total number of pilot subcarriers in the WLAN is six;
  • the frequency domain deployment module is specifically configured to determine, according to the total number of the pilot subcarriers, the subcarrier number of the pilot that carries the pilot in the WLAN as -424, -200, -88. , 88, 200, 424.
  • any one of the first to the sixth possible implementation manners of the first aspect in the sixteenth possible implementation manner of the first aspect, if the WLAN bandwidth is 40 MHz, the subcarrier
  • the number of pilot sub-determination modules is specifically configured to determine, in the frequency domain, that the total number of pilot subcarriers in the WLAN is eight;
  • the frequency domain deployment module is specifically configured to determine, according to the total number of the pilot subcarriers, the subcarrier number of the pilot that carries the pilot in the WLAN as -424, -312, -200. , -88, 88, 200, 312, 424.
  • any one of the first to the sixth possible implementation manners of the first aspect in the seventeenth possible implementation manner of the first aspect, if the WLAN bandwidth is 40 MHz, the subcarrier
  • the number of pilot sub-determination modules is specifically configured to determine, in the frequency domain, that the total number of pilot subcarriers in the WLAN is six;
  • the frequency domain deployment module is specifically configured to determine, according to the total number of the pilot subcarriers, the subcarrier number of the pilot that carries the pilot in the WLAN as -848, -400, -176. , 176, 400, 848.
  • any one of the first to the sixth possible implementation manners of the first aspect in the eighteenth possible implementation manner of the first aspect, if the WLAN bandwidth is 40 MHz, the subcarrier
  • the number of pilot sub-determination modules is specifically configured to determine, in the frequency domain, that the total number of pilot subcarriers in the WLAN is eight;
  • the frequency domain deployment module is specifically configured to determine, according to the total number of the pilot subcarriers, the subcarrier number of the pilot that carries the pilot in the WLAN as -848, -624, -400. , -176, 176, 400, 624, 848.
  • any one of the first to the sixth possible implementation manners of the first aspect in the nineteenth possible implementation manner of the first aspect, if the WLAN bandwidth is 80 MHz, the subcarrier The number of pilots is 512, and the pilot number determining module is specifically configured to determine, in the frequency domain, that the total number of pilot subcarriers in the WLAN is eight;
  • the frequency domain deployment module is specifically configured to determine, according to the total number of the pilot subcarriers, a subcarrier number of the pilot that carries the pilot in the WLAN as -206, -150, -78. , -22, 22, 78, 150, 206.
  • any one of the first to the sixth possible implementation manners of the first aspect in the twentieth possible implementation manner of the first aspect, if the WLAN bandwidth is 80 MHz, the subcarrier The number of pilot sub-determination modules is specifically configured to determine, in the frequency domain, that the total number of pilot subcarriers in the WLAN is eight;
  • the frequency domain deployment module is specifically configured to determine, according to the total number of the pilot subcarriers, the subcarrier number of the pilot that carries the pilot in the WLAN as -412, -300, -156. , —44, 44, 156, 300, 412.
  • any one of the first to sixth possible implementation manners of the first aspect in the twenty-first possible implementation manner of the first aspect, if the WLAN bandwidth is 80MHz, the number of subcarriers is 2048, and the pilot number determining module is specifically configured to determine, in the frequency domain, that the total number of pilot subcarriers in the WLAN is eight;
  • the frequency domain deployment module is specifically configured to determine, according to the total number of the pilot subcarriers, the subcarrier numbers of the pilots carrying the pilots in the WLAN as -824, -600, -312. , -88, 88, 312, 600, 824.
  • any one of the first to the sixth possible implementation manners of the first aspect in the twenty-second possible implementation manner of the first aspect, if the WLAN bandwidth is 80 MHz, The number of carriers is 4096, and the pilot number determining module is specifically configured to determine, in the frequency domain, that the total number of pilot subcarriers in the WLAN is eight;
  • the frequency domain deployment module is specifically configured to determine, according to the total number of the pilot subcarriers, the subcarrier number of the pilot that carries the pilot in the WLAN to be -1648, -1200, -624. , -176, 176, 624, 1200, 1648.
  • any one of the first to sixth possible implementation manners of the first aspect in the second thirteenth possible implementation manner of the first aspect, if the WLAN bandwidth is 160 MHz, The number of carriers is 1024, and the pilot number determining module is specifically configured to determine, in the frequency domain, that the total number of pilot subcarriers in the WLAN is 16;
  • the frequency domain deployment module is specifically configured to determine, according to the total number of the pilot subcarriers, the subcarrier number of the pilot that carries the pilot in the WLAN to be -462, -406, -334. , -278, -234, -178, -106, -50, 50, 106, 178, 234, 278, 334, 406, 462.
  • any one of the first to sixth possible implementations of the first aspect in the twenty-fourth possible implementation manner of the first aspect, if the WLAN bandwidth is 160 MHz, The number of carriers is 2048, and the pilot number determining module is specifically configured to determine, in the frequency domain, that the total number of pilot subcarriers in the WLAN is 16;
  • the frequency domain deployment module is specifically configured to determine, according to the total number of the pilot subcarriers, the subcarrier number of the pilot that carries the pilot in the WLAN as -924, -812, -668. , -556, -468, -356, -212, -100, 100, 212, 356, 468, 556, 668, 812, 924.
  • any one of the first to sixth possible implementation manners of the first aspect in the twenty-fifth possible implementation manner of the first aspect, if the WLAN bandwidth is 160 MHz, The number of carriers is 4096, and the pilot number determining module is specifically used in Determining, in the frequency domain, that the total number of pilot subcarriers in the WLAN is 16; the frequency domain deployment module is specifically configured to determine, according to the total number of pilot subcarriers, in the frequency domain.
  • the subcarrier numbers carrying the pilots in the WLAN are -1848, -1624, -1336, -1112, -936, -712, -424, -200, 200, 424, 712, 936, 1112, 1336, 1624, 1848.
  • any one of the first to the sixth possible implementation manners of the first aspect in the twenty-sixth possible implementation manner of the first aspect, if the WLAN bandwidth is 160 MHz, The number of carriers is 8192, and the pilot number determining module is specifically configured to determine, in the frequency domain, that the total number of pilot subcarriers in the WLAN is 16;
  • the frequency domain deployment module is specifically configured to determine, according to the total number of the pilot subcarriers, the subcarrier number of the pilot that carries the pilot in the WLAN as -3696, -3248, -2672 , -2224, -1872, -1424, -848, -400, 400, 848, 1424, 1872, 2224, 2672, 3248, 3696.
  • the present invention provides a receiving end device, including:
  • a signal receiving module configured to receive a signal sent by the sending end device over the entire bandwidth of the WLAN of the wireless local area network
  • a pilot processing module configured to demodulate all the pilots from the received signal according to a subcarrier number carrying a pilot in the WLAN and a symbol of the WLAN, and acquire a phase according to the pilot tracking information
  • a data demodulation module configured to perform phase compensation on the data in the signal according to the phase tracking information and demodulate the data.
  • the pilot processing module is specifically configured to: on a first symbol of the WLAN that carries the pilot, according to the bearer
  • the pilot calculation carried on the resource element RE corresponding to the subcarrier number of the pilot acquires a first phase offset on the RE; and calculates, according to the first phase offset, a linear interpolation method a second phase offset phase offset on the frequency RE; determining a phase offset caused by residual frequency offset and phase noise based on the first phase offset and the second phase offset, and calculating the phase tracking information.
  • the pilot processing module is specifically configured to not carry the pilot Calculating, on the second symbol of the WLAN, a third phase offset on the RE in the same frequency band as the RE carrying the pilot by using a linear interpolation method according to the first phase offset;
  • the phase offset uses a linear interpolation method to calculate a fourth phase offset on the RE of the different frequency band of the RE carrying the pilot; determining the residual frequency offset according to the third phase offset and the fourth phase offset
  • the phase deviation caused by the phase noise and the phase tracking information is calculated.
  • the pilot processing module is specifically configured to be used in the WLAN that does not carry the pilot Calculating, on the second symbol, the third phase offset on the second symbol by using a linear interpolation method according to the first phase offset on the first symbol before the second symbol;
  • the third phase offset calculates a fourth phase offset on the RE of the different frequency band of the RE carrying the pilot by using a linear interpolation method; determining according to the third phase offset and the fourth phase offset The phase deviation caused by the residual frequency offset and phase noise, and the phase tracking information is calculated.
  • the pilot processing module is specifically configured to be used in the WLAN that does not carry the pilot Calculating, on the second symbol, the third phase offset on the second symbol by linear interpolation according to the first phase offset on the first symbol before and after the second symbol Calculating a fourth phase offset on the RE of the different frequency band from the RE carrying the pilot according to the third phase offset by using a linear interpolation method; according to the third phase offset and the fourth phase offset The phase deviation determined by the residual frequency offset and the phase noise is determined, and the phase tracking information is calculated.
  • the present invention provides a method for processing a pilot of a wireless local area network, including: determining, in a frequency domain, a total number of pilot subcarriers in a WLAN of a wireless local area network;
  • the pilot is uniformly carried in the symbol of the WLAN
  • the determining, in the frequency domain determining, by using a total number of the pilot subcarriers, a subcarrier number of a pilot that carries a pilot in the WLAN. , including: Deploying, on the frequency domain, the pilots symmetrically and uniformly on both sides of the DC subcarriers of the WLAN according to the total number of the pilot subcarriers, to determine the subcarrier sequence number of the bearer pilot.
  • the pilot is uniformly deployed on the entire bandwidth of the WLAN according to the total number of the pilot subcarriers to determine the subcarrier number of the bearer.
  • Determining, in the frequency domain, the subcarrier number of the pilot that carries the pilot in the WLAN according to the total number of the pilot subcarriers including:
  • the bandwidth of the WLAN is 40 MHz MHz and the frequency domain is determined
  • the total number of pilot subcarriers in the WLAN is determined.
  • the number of the subcarriers carrying the pilots in the WLAN is determined according to the total number of the pilot subcarriers in the frequency domain, including:
  • a system that acquires a 20 MHz bandwidth according to the total number of the pilot subcarriers, and the number of the subcarriers is half of the number of subcarriers of the WLAN, and carries the pilot subcarrier sequence number. Encoding the subcarrier number of the pilot to obtain a subcarrier number carrying the pilot on a half of the bandwidth of the WLAN;
  • the determining, in the frequency domain, determining a subcarrier number of a pilot that carries the pilot in the WLAN according to the total number of the pilot subcarriers including: Selecting, in the frequency domain, a bearer in the WLAN from 16 pilot-bearing subcarrier numbers in a system of 160 MHz bandwidth specified in the IEEE802.11ac according to the total number of pilot subcarriers.
  • the subcarrier number of the pilot, the number of the subcarrier numbers is equal to the total number of the pilot subcarriers, and the subcarrier numbers are evenly distributed over the entire bandwidth of the WLAN.
  • any one of the first to fourth possible implementation manners of the third aspect in a fifth possible implementation manner of the third aspect, is uniformly carried in the symbols of the WLAN, including:
  • the pilot is carried every at least one of the symbols on the symbol of the WLAN.
  • the pilot is uniformly carried in a symbol of the WLAN in a time domain, Includes:
  • the pilot is carried every other or three of the symbols on the symbol of the WLAN.
  • the possible implementation manner of any one of the first to sixth aspects of the third aspect in a seventh possible implementation manner of the third aspect, if the WLAN bandwidth is 20 MHz, the subcarrier The number of pilot subcarriers in the WLAN is determined in the frequency domain, including:
  • the subcarrier serial number including:
  • the subcarrier serial number including: In the frequency domain, determining, according to the total number of the pilot subcarriers, the subcarrier numbers carrying the pilots in the WLAN are -84, -28, 28, 84.
  • the possible implementation manner of any one of the first to sixth aspects of the third aspect in a ninth possible implementation manner of the third aspect, if the WLAN bandwidth is 20 MHz, the subcarrier The number of pilot subcarriers in the WLAN is determined in the frequency domain, including:
  • the subcarrier serial number including:
  • the possible implementation manner of any one of the first to sixth aspects of the third aspect in a tenth possible implementation manner of the third aspect, if the WLAN bandwidth is 20 MHz, the subcarrier The number of pilot subcarriers in the WLAN is determined in the frequency domain, including:
  • the subcarrier serial number including:
  • the possible implementation manner of any one of the first to sixth aspects of the third aspect in the eleventh possible implementation manner of the third aspect, if the WLAN bandwidth is 40 MHz, The number of carriers is 256, and the total number of pilot subcarriers in the WLAN in the WLAN is determined in the frequency domain, including:
  • the subcarrier serial number including:
  • determining, according to the total number of pilot subcarriers, the subcarrier numbers carrying the pilots in the WLAN are -106, -50, -22, 22, 50, 106.
  • the possible implementation side In a twelfth possible implementation manner of the third aspect, if the WLAN bandwidth is 40 MHz and the number of subcarriers is 256, determining, in the frequency domain, a pilot in a wireless local area network WLAN The total number of carriers, including:
  • the subcarrier serial number including:
  • a subcarrier number of the pilot that carries the pilot in the WLAN is -106, -78, -50, -22, 22, 50, 78, 106.
  • the possible implementation manner of any one of the first to sixth aspects of the third aspect in the thirteenth possible implementation manner of the third aspect, if the WLAN bandwidth is 40 MHz, The number of carriers is 512, and the total number of pilot subcarriers in the WLAN in the WLAN is determined in the frequency domain, including:
  • the subcarrier serial number including:
  • determining, according to the total number of the pilot subcarriers, the subcarrier numbers carrying the pilots in the WLAN are -212, -100, -44, 44, 100, 212.
  • the possible implementation manner of any one of the first to sixth aspects of the third aspect in the fourteenth possible implementation manner of the third aspect, if the WLAN bandwidth is 40 MHz, The number of carriers is 512, and the total number of pilot subcarriers in the WLAN in the WLAN is determined in the frequency domain, including:
  • the subcarrier serial number including:
  • a subcarrier number of the pilot that carries the pilot in the WLAN is -212, -156, -100, -44, 44, 100, 156, 212.
  • the possible implementation manner of any one of the first to sixth aspects of the third aspect in a fifteenth possible implementation manner of the third aspect, if the WLAN bandwidth is 40 MHz, The number of carriers is 1024, and the total number of pilot subcarriers in the WLAN in the WLAN is determined in the frequency domain, including: Determining, in the frequency domain, that the total number of pilot subcarriers in the WLAN is six; in the frequency domain, determining a bearer pilot in the WLAN according to a total number of the pilot subcarriers
  • the subcarrier serial number including:
  • the possible implementation manner of any one of the first to sixth aspects of the third aspect in a sixteenth possible implementation manner of the third aspect, if the WLAN bandwidth is 40 MHz, The number of carriers is 1024, and the total number of pilot subcarriers in the WLAN in the WLAN is determined in the frequency domain, including:
  • the subcarrier serial number including:
  • a subcarrier number of the pilot that carries the pilot in the WLAN is -424, -312, -200, -88, 88, 200, 312, 424.
  • the possible implementation manner of any one of the first to sixth aspects of the third aspect in the seventeenth possible implementation manner of the third aspect, if the WLAN bandwidth is 40 MHz, The number of carriers is 2048, and the total number of pilot subcarriers in the WLAN in the WLAN is determined in the frequency domain, including:
  • the subcarrier serial number including:
  • the possible implementation manner of any one of the first to sixth aspects of the third aspect in the eighteenth possible implementation manner of the third aspect, if the WLAN bandwidth is 40 MHz, The number of carriers is 2048, and the total number of pilot subcarriers in the WLAN in the WLAN is determined in the frequency domain, including:
  • the subcarrier serial number including: Determining, in the frequency domain, that the subcarriers carrying the pilots in the WLAN are -848, -624, -400, -176, 176, 400, 624 according to the total number of pilot subcarriers. 848.
  • the possible implementation manner of any one of the first to sixth aspects of the third aspect in a nineteenth possible implementation manner of the third aspect, if the WLAN bandwidth is 80 MHz, The number of carriers is 512, and the total number of pilot subcarriers in the WLAN in the WLAN is determined in the frequency domain, including:
  • the subcarrier serial number including:
  • a subcarrier number of the pilot that carries the pilot in the WLAN is -206, -150, -78, -22, 22, 78, 150, 206.
  • the possible implementation manner of any one of the first to sixth aspects of the third aspect in the twentieth possible implementation manner of the third aspect, if the WLAN bandwidth is 80 MHz, The number of carriers is 1024, and the total number of pilot subcarriers in the WLAN in the WLAN is determined in the frequency domain, including:
  • the subcarrier serial number including:
  • a subcarrier number of the pilot that carries the pilot in the WLAN is -412, -300, -156, -44, 44, 156, 300, 412.
  • the possible implementation of any one of the first to sixth aspects of the third aspect in the twenty-first possible implementation manner of the third aspect, if the WLAN bandwidth is 80 MHz, The number of subcarriers is 2048, and the total number of pilot subcarriers in the WLAN in the WLAN is determined in the frequency domain, including:
  • the subcarrier serial number including:
  • the possible implementation side In a twenty-second possible implementation manner of the third aspect, if the WLAN bandwidth is 80 MHz and the number of subcarriers is 4096, determining the pilot in the WLAN in the WLAN in the frequency domain The total number of subcarriers, including:
  • the subcarrier serial number including:
  • the subcarrier numbers carrying the pilots in the WLAN are -1648, -1200, -624, -176, 176, 624, 1200 according to the total number of pilot subcarriers. 1648.
  • the possible implementation manner of any one of the first to sixth aspects of the third aspect in the twenty-third possible implementation manner of the third aspect, if the WLAN bandwidth is
  • the number of subcarriers is 1024, then in the frequency domain, determine the wireless local area network
  • the total number of pilot subcarriers in the WLAN including:
  • Determining, in the frequency domain, a total number of pilot subcarriers in the WLAN is 16; in the frequency domain, determining a bearer pilot in the WLAN according to a total number of the pilot subcarriers
  • the subcarrier serial number including:
  • the possible implementation manner of any one of the first to sixth aspects of the third aspect in the twenty-fourth possible implementation manner of the third aspect, if the WLAN bandwidth is
  • the number of subcarriers is 2048, then in the frequency domain, determine the wireless local area network
  • the total number of pilot subcarriers in the WLAN including:
  • Determining, in the frequency domain, a total number of pilot subcarriers in the WLAN is 16; in the frequency domain, determining a bearer pilot in the WLAN according to a total number of the pilot subcarriers
  • the subcarrier serial number including:
  • the possible implementation side In a twenty-fifth possible implementation manner of the third aspect, if the WLAN bandwidth is 160 MHz and the number of subcarriers is 4096, determining the pilot in the WLAN in the WLAN in the frequency domain
  • the total number of subcarriers including:
  • Determining, in the frequency domain, a total number of pilot subcarriers in the WLAN is 16; in the frequency domain, determining a bearer pilot in the WLAN according to a total number of the pilot subcarriers
  • the subcarrier serial number including:
  • the subcarrier numbers carrying the pilots in the WLAN are -1848, -1624, -1336, -1112, -936, -712, according to the total number of pilot subcarriers. -424, -200, 200, 424, 712, 936, 1112, 1336, 1624, 1848.
  • the possible implementation of any one of the first to sixth aspects of the third aspect in the twenty-sixth possible implementation manner of the third aspect, if the WLAN bandwidth is 160 MHz, The number of subcarriers is 8192, and the total number of pilot subcarriers in the WLAN in the WLAN is determined in the frequency domain, including:
  • Determining, in the frequency domain, a total number of pilot subcarriers in the WLAN is 16; in the frequency domain, determining a bearer pilot in the WLAN according to a total number of the pilot subcarriers
  • the subcarrier serial number including:
  • the subcarrier numbers carrying the pilots in the WLAN are -3696, -3248, -2672, -2224, -1872, -1424, according to the total number of the pilot subcarriers, -848, -400, 400, 848, 1424, 1872, 2224, 2672, 3248, 3696.
  • a fourth aspect of the present invention provides a method for processing a pilot of a wireless local area network, including: receiving a signal sent by a transmitting end device over an entire bandwidth of a WLAN; and determining, according to the subcarrier number of the pilot in the WLAN, a symbol of the WLAN, demodulating all of the pilots from the received signal, and acquiring phase tracking information according to the pilot; phase compensating and demodulating data in the signal according to the phase tracking information The data.
  • the demodulating from the received signal according to a subcarrier number carrying a pilot in the WLAN and a symbol of the WLAN All the pilots, and acquiring phase tracking information according to the pilot including:
  • a phase deviation caused by residual frequency offset and phase noise is determined based on the first phase offset and the second phase offset, and the phase tracking information is calculated.
  • the subcarrier serial number carrying the pilot in the WLAN and the WLAN a symbol, demodulating all of the pilots from the received signal, and acquiring phase tracking information according to the pilot including:
  • a phase deviation caused by residual frequency offset and phase noise is determined based on the third phase offset and the fourth phase offset, and the phase tracking information is calculated.
  • the second symbol of the WLAN that does not carry the pilot uses a linear interpolation method to calculate a third phase offset on the RE in the same frequency band as the RE carrying the pilot, including:
  • the second symbol of the WLAN that does not carry the pilot Calculating, according to the first phase offset, a third phase offset on the RE in the same frequency band as the RE carrying the pilot by using a linear interpolation method, including:
  • the present invention provides a communication system, including: a transmitting end device and a receiving end device, wherein the transmitting end device adopts the first aspect, the first to the twenty-sixth of the first aspect
  • the transmitting end device adopts the first aspect, the first to the twenty-sixth of the first aspect
  • the apparatus described in the possible implementation manners; the receiving end apparatus adopts the apparatus described in the second aspect, the possible implementation manner of any one of the first to fourth aspects of the second aspect.
  • the pilot processing method, device and communication system of the wireless local area network of the present invention by redeploying pilot frequency distribution in the frequency domain and the time domain in a WLAN system with improved number of subcarriers, thereby improving system performance and throughput, and eliminating the system
  • the effects of residual frequency offset and phase noise are generated, which effectively reduces the packet error rate.
  • FIG. 1 is a schematic structural diagram of an embodiment of a transmitting end device according to the present invention.
  • 2 is a schematic diagram of a subcarrier pattern
  • 3 is a schematic diagram of a subcarrier pattern of a WLAN with a number of subcarriers of 20 MHz bandwidth;
  • 4A is a schematic diagram of a subcarrier pattern of a WLAN with a number of 256 20MHz bandwidth subcarriers
  • 4B is a schematic diagram of a subcarrier pattern of a WLAN with a number of 256 MIMO subcarriers
  • 5 is a schematic diagram of a subcarrier pattern of a WLAN with a number of sub-carriers of 20 MHz bandwidth;
  • FIG. 6 is a schematic diagram of a subcarrier pattern of a WLAN with a number of 1024 20MHz bandwidth subcarriers
  • FIG. 7 is a schematic diagram of a subcarrier pattern of a WLAN with a number of sub-carriers of 40 MHz bandwidth;
  • 8 is a schematic diagram 2 of a subcarrier pattern of a WLAN with a number of 256 40MHz bandwidth subcarriers; 9 is a flowchart of an embodiment of a receiving end device according to the present invention.
  • FIG. 10 is a schematic diagram of a method for processing a pilot of a wireless local area network according to the present invention.
  • FIG. 11 is a schematic diagram of a method for processing a pilot of a wireless local area network according to the present invention.
  • FIG. 12 is a schematic structural diagram of an embodiment of a transmitting end device according to the present invention.
  • FIG. 13 is a schematic structural diagram of an embodiment of a receiving end device according to the present invention.
  • Embodiment 1 of a communication system is a schematic structural diagram of Embodiment 1 of a communication system according to the present invention.
  • FIG. 15 is a schematic structural diagram of Embodiment 2 of a communication system according to the present invention. detailed description
  • the device in this embodiment may include: a pilot number determining module 11, a frequency domain deploying module 12, a time domain deploying module 13, and a signal sending module.
  • the pilot number determining module 11 is configured to determine, in a frequency domain, a total number of pilot subcarriers in a WLAN, and a frequency domain deployment module 12, configured to: in the frequency domain, according to the guiding The total number of frequency subcarriers determines the subcarrier number of the pilot that carries the pilot in the WLAN; the time domain deployment module 13 is configured to uniformly carry the pilot in the symbol of the WLAN in the time domain; The module 14 is configured to send a signal to the receiving end device according to the subcarrier serial number carrying the pilot and the symbol, so that the receiving end device acquires phase tracking information according to the pilot in the signal, and further Phase compensation and demodulation of the data in the signal.
  • the transmitting device of this embodiment is suitable for comparison with the Institute of Electrical and Electronics Engineers (Institute of Electrical and Electronics Engineers (Institute of Electrical and Electronics Engineers (Institute of Electrical and Electronics Engineers (Institute of Electrical and Electronics Engineers (Institute of Electrical and Electronics Engineers (Institute of Electrical and Electronics Engineers (Institute of Electrical and Electronics Engineers (Institute of Electrical and Electronics Engineers (Institute of Electrical and Electronics Engineers (Institute of
  • IEEE 802.1 lac/1 la/llg/1 In specified standard, WLAN system with reduced subcarrier spacing and increased number of subcarriers.
  • IEEE802.1 lac/1 la/l lg/1 In specifies that the subcarrier spacing of the WLAN system is 312.5 kHz, then the number of subcarriers in the 20 MHz bandwidth system is 64, and the number of subcarriers in the 40 MHz bandwidth system is 128, 80 MHz. Bandwidth system with 256 subcarriers, 160MHz bandwidth system The number of subcarriers is 512.
  • IEEE802.11ac/lla/l lg/lln also specifies the usage and distribution of subcarriers of the WLAN system.
  • a system with 20 MHz bandwidth includes 4 pilot subcarriers and 48 data subcarriers. And one DC subcarrier, and the remaining 11 subcarriers are used as protection bandwidth non-transmission information, and the four pilot subcarriers are located at subcarrier numbers of -21, -7, 7, and 21, respectively, so the existing WLAN system
  • the subcarrier spacing, the number of subcarriers, and the distribution and role of the subcarriers are all specified in the protocol. However, in order to improve throughput, we hope to reduce the subcarrier spacing and increase the number of subcarriers. For example, a 20MHz WLAN system can have 128, 256, 512, or even 1024 subcarriers.
  • IEEE802 The four pilot subcarriers specified by .11ac/lla/llg/lln and their distribution are unable to meet the system's requirements for pilots.
  • the device in this embodiment is applicable to the foregoing WLAN system with improved number of subcarriers.
  • the WLAN system herein may be a 128 MHz WLAN system of 128, 256, 512, and 1024 subcarriers, or may be 256 or 512.
  • a 1024, 2048 subcarrier 40 MHz WLAN system can also be an 80 MHz WLAN system of 512, 1024, 2048, 4096 subcarriers, or 160 MHz of 1024, 2048, 4096, 8192 subcarriers.
  • WLAN system may be a 128 MHz WLAN system of 128, 256, 512, and 1024 subcarriers, or may be 256 or 512.
  • a 1024, 2048 subcarrier 40 MHz WLAN system can also be an 80 MHz WLAN system of 512, 1024, 2048, 4096 subcarrier
  • the transmitting end device of this embodiment considers two dimensions of a frequency division domain and a time domain when determining the deployment of the pilot. Firstly, the total number of pilot subcarriers in the WLAN system is determined in the frequency domain. This determination process can be determined by simulation results, which can not affect the performance of the system, and can effectively control the overhead of the system, so generally it can be Take the compromise between the two. For example, the WLAN with a bandwidth of 512 subcarriers of 20 MHz is simulated under the condition that the total number of pilot subcarriers is 4, 8, and 16. The simulation results show the pilot subcarriers. The higher the total number, the lower the packet error rate. In theory, the higher the total number of pilot subcarriers, the better the performance.
  • the total number of pilot subcarriers is determined to be four in a WLAN system with a bandwidth of 512 subcarriers of 20 MHz.
  • the subcarrier number of the pilot bearer in the WLAN is determined according to the total number of pilot subcarriers, and the total number of pilot subcarriers has been determined, and these pilots need to be deployed in the subcarriers of the WLAN.
  • the pilot subcarriers can be evenly distributed in the entire bandwidth of the WLAN, and the subcarrier numbers carrying the pilots are determined.
  • the subcarriers in the middle of the WLAN subcarriers are DC subcarriers. Wave, the serial number of the DC subcarrier is 0, and the absolute value of the serial number on both sides gradually becomes symmetrically larger. The difference is that the serial number of one side is positive, and the serial number of one side is negative, so each subcarrier corresponds to a unique subcarrier serial number, and is determined.
  • the subcarrier number carrying the pilot determines the position of the pilot in the frequency domain.
  • the pilot is uniformly carried in the symbol of the WLAN, and the WLAN can be divided into consecutive Orthogonal Frequency Division Multiplexing (OFDM) symbols in the time domain, which is in the prior art.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the pilot information is continuously carried on all the symbols, which also causes the system overhead to greatly affect the throughput.
  • the present invention changes the deployment situation.
  • the pilots are no longer continuous. Placement, only need to be evenly carried in the symbols of the WLAN, so-called uniform bearer can be placed on each of several symbols a pilot, in particular, several symbols must also consider system performance and system overhead, Take the compromise.
  • FIG. 2 is a schematic diagram of the subcarrier pattern. As shown in Figure 2, each small square represents an RE, which can be identified by the symbol and subcarrier number.
  • the small square of black indicates the The RE carries the pilot, and the subcarrier number corresponding to the horizontal axis is obtained by the process of deploying the pilot in the frequency domain. How many black small squares in a column indicate the total number of pilot subcarriers, and The symbol corresponding to the axis is obtained by the foregoing process of deploying the pilot in the time domain, and the transmitting device sends a message to the receiving device according to the subcarrier pattern shown in FIG.
  • the signal includes data carried on the pilot and other subcarriers, and the receiving device acquires phase tracking information according to the pilot in the signal, and then phase compensates the data according to the phase tracking information to accurately demodulate the data and reduce Packet error rate.
  • the apparatus of this embodiment improves system performance and throughput by redeploying pilot frequency distribution in the frequency domain and the time domain in a WLAN system with improved number of subcarriers, and eliminates residual frequency offset and phase noise generated by the system. Impact, effectively reducing the rate of packet errors.
  • the frequency domain deployment module 12 is specifically configured to deploy the pilot symmetrically and uniformly on the DC subcarrier of the WLAN according to the total number of the pilot subcarriers in the frequency domain. Determining, by the side, the subcarrier number of the bearer; or, in the frequency domain, uniformly spreading the pilot to the entire bandwidth of the WLAN according to the total number of pilot subcarriers. The subcarrier number of the bearer pilot is determined.
  • the apparatus of this embodiment has two methods for deploying pilots in the frequency domain, and one is
  • the WLAN DC subcarrier is an axis, and the pilot is symmetrically and uniformly deployed on the upper and lower sides, that is, the subcarrier carrying the pilot is on both sides of the subcarrier whose subcarrier number is 0, and the subcarrier numbers thereof are equal in absolute value, and one side is positive.
  • the one side is negative, and the subcarrier number carrying the pilot can be obtained according to the result of the deployment; the other is to uniformly distribute the pilot in the entire bandwidth of the WLAN, that is, between the subcarriers adjacent to the pilot. If the intervals are equal or similar, the subcarrier number carrying the pilot can be obtained according to the result of the deployment.
  • the frequency domain deployment module 12 is specifically configured to obtain the same number of subcarriers as the WLAN and the WLAN bandwidth specified in the IEEE 802.11ac/lla/llg/l ln of the WLAN. a multiple of the number of subcarriers to be expanded; in the frequency domain, the same as the WLAN bandwidth specified in the IEEE802.11ac/l la/llg/lln according to the total number of pilot subcarriers The subcarrier number carrying the pilot in the system is expanded by the multiple, and the subcarrier number carrying the pilot in the WLAN is obtained.
  • IEEE802.11ac/lla/llg/l ln specifies a WLAN with a bandwidth of 20 MHz, with 64 subcarriers, and the subcarrier number carrying the pilot is -21, -7, 7, 21, and now the WLAN of 20 MHz bandwidth, The number of carriers is increased to 512. According to the simulation result, the total number of pilot subcarriers in the system is determined to be four, and the number of 512 subcarriers is eight times the number of 64 subcarriers.
  • the subcarrier number of the pilot carrier defined by IEEE802.11ac is also Multiply by 8, ie (-21x8), (-7x8), (7x8), (21x8), get -84, -28, 28, 84, which is the WLAN system with 20MHz bandwidth 512 subcarriers determined in the frequency domain The subcarrier number of the bearer carrying the pilot.
  • the IEEE 802.1 lac specifies a WLAN with an 80 MHz bandwidth, and has 256 subcarriers.
  • the subcarrier numbers carrying the pilots are -103, -75, -39, -11, 11, 39, 75, 103, and now 80 MHz bandwidth.
  • WLAN the number of subcarriers is increased to 1024.
  • the total number of pilot subcarriers in the system is determined to be 8, and the number of 1024 subcarriers is 4 times the number of 256 subcarriers, and the bearer carrying the pilot defined by IEEE802.11ac is used.
  • the carrier number is also multiplied by 4 to obtain -412, -300, - 156, -44, 44, 156, 300, 412. This is the bearer of the pilot that is determined in the frequency domain by the WLAN system with an bandwidth of 1024 subcarriers of 80 MHz bandwidth. Carrier number.
  • the frequency domain is The deployment module 12 is specifically configured to, according to the total number of the pilot subcarriers, in the frequency domain Obtaining a sub-carrier number of the pilot that is obtained by acquiring a frequency of a sub-carrier number of the pilot by acquiring a sub-carrier number of the pilot, where the number of the sub-carriers is a half of the number of the sub-carriers of the WLAN. a subcarrier number carrying the pilot on a half of the bandwidth of the WLAN; determining, according to the subcarrier number carrying the pilot on the half of the bandwidth of the WLAN, the pilot carrying the pilot on the symmetric half of the bandwidth of the WLAN Carrier number.
  • the WLAN system of 40 MHz bandwidth determines that the total number of pilot subcarriers of the system may be six or eight according to simulation results, and both cases are good discounts of packet error rate and throughput.
  • Midpoint if it is determined that the total number of pilot subcarriers is six, since the IEEE802.11ac/llg/lln specifies six subcarriers carrying pilots in a WLAN system with a bandwidth of 128 subcarriers of 40 MHz, the above expansion factor may be used.
  • the method determines the subcarrier number of the bearer.
  • the subcarrier number carrying the pilot may be determined in three steps, for example, a WLAN system with a bandwidth of 1024 subcarriers of 40 MHz, and a deployment of a WLAN system with a bandwidth of 512 subcarriers of 20 MHz bandwidth first.
  • the frequency domain deployment module 12 is specifically configured to: in the frequency domain, 16 bearer pilots in a system of 160 MHz bandwidth specified in the IEEE802.11ac according to the total number of the pilot subcarriers.
  • the number of subcarriers carrying the pilot in the WLAN is selected from the subcarrier numbers, the number of the subcarrier numbers is equal to the total number of the pilot subcarriers, and the subcarrier number is in the The WLAN is evenly distributed over the entire bandwidth.
  • IEEE 802.11ac specifies a 160 MHz bandwidth WLAN with 512 subcarriers, and 16 pilot-bearing subcarrier numbers are -231, -203, -167, -139, -117, -89, -53, - 25, 25, 53, 89, 117, 139, 167, 203, 231, four of the 16 subcarrier numbers can be uniformly extracted as the pilot subcarriers when the 512 subcarriers of the 20 MHz bandwidth are used. For example, it can be -231, -117, 25, 139, or -167, -53, 53, 167. There are many options, which are not listed here.
  • time domain deployment module 13 is specifically configured to carry the pilot every at least one of the symbols on the symbol of the WLAN in the time domain.
  • the time domain deployment module 13 is specifically configured to carry the pilot every other one or three of the symbols on the symbol of the WLAN in the time domain.
  • the pilot when the apparatus in this embodiment deploys the pilot in the time domain, the pilot is not deployed on each symbol, and may be deployed by one or more symbols. Preferably, the pilot may be carried by one symbol. The pilot can also be carried by three symbols, which can reduce the overhead of the system to carry the pilot and improve the system throughput.
  • the apparatus of the above embodiment can be separately deployed in the frequency domain and the time domain to determine the RE of the final bearer.
  • the following describes several specific embodiments.
  • FIG. 3 is a schematic diagram of a subcarrier pattern of a WLAN with a number of subcarriers of 20 MHz bandwidth. As shown in FIG. 3, the total number of pilot subcarriers determined in the WLAN is four, and the subcarrier number carrying the pilot is -42, -14, 14, 42, pilots are carried every other symbol. Optionally, the pilot is carried every three symbols in the time domain, and details are not described herein again.
  • 4A is a schematic diagram of a subcarrier pattern of a 256 WLAN subcarrier with a number of 256 subcarriers. As shown in FIG. 4A, the total number of pilot subcarriers determined in the WLAN is four, and the pilot subcarrier number is carried. For -84, -28, 28, 84, pilots are carried every other symbol.
  • 4B is a schematic diagram of a subcarrier pattern of a 256 WLAN subcarrier with a number of 256 subcarriers. As shown in FIG. 4B, the total number of pilot subcarriers determined in the WLAN is four, and the pilot subcarrier number is carried. For -84, -28, 28, 84, the pilot is carried every three symbols.
  • Both of the above-mentioned two formats can realize the reasonable deployment of the entire bandwidth of the WLAN with the number of sub-carriers of 20 MHz bandwidth, which can not only reduce the packet error rate of the system, but also can not affect the throughput of the system.
  • the deployment obtains accurate phase tracking information to demodulate the data.
  • FIG. 5 is a schematic diagram of a subcarrier pattern of a 512 WLAN subcarrier with a number of 512 subcarriers.
  • the total number of pilot subcarriers determined in the WLAN is four, and the subcarrier number carrying the pilot is -168, -56, 56, 168, Pilots are carried every three symbols.
  • pilots are carried every other symbol in the time domain, and details are not described herein again.
  • FIG. 6 is a schematic diagram of a subcarrier pattern of a WLAN with a number of 1024 subcarriers of 20 MHz bandwidth. As shown in FIG. 6, the total number of pilot subcarriers determined in the WLAN is four, and the subcarriers carrying pilots are numbered -336, -112, 112, 336, and pilots are carried every three symbols. Optionally, as shown in FIG. 4A, the pilot is carried every other symbol in the time domain, and details are not described herein again.
  • FIG. 7 is a schematic diagram of a subcarrier pattern of a WLAN with a number of 256 subcarriers of 40 MHz bandwidth. As shown in FIG. 7, the total number of pilot subcarriers determined in the WLAN is six, and the subcarrier number carrying the pilot is used. For -106, -50, -22, 22, 50, 106, pilots are carried every other symbol. Alternatively, as shown in FIG. 4B, the pilot is carried every three symbols in the time domain, and details are not described herein again.
  • FIG. 8 is a schematic diagram of a subcarrier pattern of a WLAN with a number of 256 subcarriers of 40 MHz bandwidth. As shown in FIG. 8, the total number of pilot subcarriers determined in the WLAN is eight, and the subcarrier number of the pilot is carried. The pilot is carried every three symbols for -106, -78, -50, -22, 22, 50, 78, 106. Optionally, as shown in FIG. 4A, the pilot is carried every other symbol in the time domain, and details are not described herein again.
  • the total number of WLAN determined pilot subcarriers with a number of 512 40MHz bandwidth subcarriers is six, and the subcarrier numbers carrying the pilots are -212, -100, -44, 44, 100, 212,
  • the pilot may be carried every other symbol as shown in FIG. 4A, or may be carried every three symbols in the time domain as shown in FIG. 4B, and details are not described herein again.
  • the total number of WLAN determined pilot subcarriers is 512, and the number of subcarriers carrying pilots is -212, -156, -100, -44, 44, 100, 156. 212, the pilot may be carried every other symbol as shown in FIG. 4A, or may be carried every three symbols in the time domain as shown in FIG. 4B, and details are not described herein again.
  • the total number of pilot subcarriers of the WLAN with a number of 1024 40MHz bandwidth subcarriers is six, and the subcarrier numbers carrying the pilots are -424, -200, -88, 88, 200, 424, as shown in the figure.
  • Each of the symbols shown in FIG. 4A carries a pilot, and as shown in FIG. 4B, the pilot is carried every three symbols in the time domain, and details are not described herein again.
  • the total number of WLAN determined pilot subcarriers with 1024 OFDM subcarriers is 8 and the subcarriers carrying pilots are -424, -312, -200, -88, 88, 200, 312. 424, the pilot may be carried every other symbol as shown in FIG. 4A, or may be carried every three symbols in the time domain as shown in FIG. 4B, and details are not described herein again.
  • the total number of pilot subcarriers determined by the WLAN of 4048 bandwidth subcarriers is 2048.
  • the subcarriers carrying the pilots are numbered -848, -400, -176, 176, 400, 848.
  • the pilots may be carried every other symbol as shown in FIG. 4A, or as shown in FIG. 4B.
  • the pilot is carried every three symbols in the time domain, and will not be described in detail here.
  • the total number of WLAN determined pilot subcarriers with 2040 bandwidth subcarriers is 2048, and the subcarriers carrying pilots are -848, -624, -400, -176, 176, 400, 624. 848, the pilot may be carried every other symbol as shown in FIG. 4A, or may be carried every three symbols in the time domain as shown in FIG. 4B, and details are not described herein again.
  • the total number of WLAN determining pilot subcarriers with 512 802 WLAN subcarriers is 8 and the subcarriers carrying pilots are -206, -150, -78, -22, 22, 78, 150. 206, the pilot may be carried every other symbol as shown in FIG. 4A, or may be carried every three symbols in the time domain as shown in FIG. 4B, and details are not described herein again.
  • the total number of WLAN determined pilot subcarriers with 1024 802 WLAN subcarriers is 8, and the subcarriers carrying pilots are -412, -300, -156, -44, 44, 156, 300. 412, the pilot may be carried every other symbol as shown in FIG. 4A, or may be carried every three symbols in the time domain as shown in FIG. 4B, and details are not described herein again.
  • the total number of WLAN determined pilot subcarriers with 2048 bandwidth subcarriers is 2048, and the subcarriers carrying pilots are -824, -600, -312, -88, 88, 312, 600, 824, the pilot may be carried every other symbol as shown in FIG. 4A, or may be carried every three symbols in the time domain as shown in FIG. 4B, and details are not described herein again.
  • the total number of WLAN determined pilot subcarriers with 4096 802 WLAN subcarriers is 8 and the subcarriers carrying pilots are -1648, -1200, -624, -176, 176, 624, 1200. 1648, the pilot may be carried every other symbol as shown in FIG. 4A, or may be carried every three symbols in the time domain as shown in FIG. 4B, and details are not described herein again.
  • the total number of pilot subcarriers of the WLAN with 160 Mbps bandwidth subcarriers is 164, and the subcarriers carrying the pilots are -462, -406, -334, -278, -234, -178, -106, -50, 50, 106, 178, 234, 278, 334, 406, 462, the pilot may be carried every other symbol as shown in FIG. 4A, or as shown in FIG. 4B, every time in the time domain.
  • the three symbols carry pilots, which are not described in detail here.
  • the total number of WLAN determined pilot subcarriers with a number of 16048 bandwidth subcarriers is 1648, and the subcarrier numbers carrying the pilots are -924, -812, -668, -556, -468, -356, -212, -100, 100, 212, 356, 468, 556, 668, 812, 924, can be as shown
  • Each of the symbols shown in FIG. 4A carries a pilot, and as shown in FIG. 4B, the pilot is carried every three symbols in the time domain, and details are not described herein again.
  • the total number of pilot subcarriers for WLANs with 4096 CDMA subcarriers is 16, and the subcarriers carrying pilots are -1848, -1624, -1336, -1112, -936, -712, -424, -200, 200, 424, 712, 936, 1112, 1336, 1624, 1848, the pilot may be carried every other symbol as shown in FIG. 4A, or as shown in FIG. 4B, every time in the time domain.
  • the three symbols carry pilots, which are not described in detail here.
  • the total number of WLAN determining pilot subcarriers with the number of 160MHz bandwidth subcarriers is 8192, and the subcarrier numbers carrying pilots are -3696, -3248, -2672, -2224, -1872, -1424, -848, -400, 400, 848, 1424, 1872, 2224, 2672, 3248, 3696, the pilot may be carried every other symbol as shown in FIG. 4A, or as shown in FIG. 4B, every time in the time domain.
  • the three symbols carry pilots, which are not described in detail here.
  • FIG. 9 is a flowchart of an embodiment of a receiving device according to the present invention.
  • the device in this embodiment may include: a signal receiving module 11, a pilot processing module 12, and a data demodulating module 13, wherein the signal receiving module 11.
  • the signal is sent by the sending end device on the entire bandwidth of the WLAN WLAN.
  • the pilot processing module 12 is configured to receive, according to the subcarrier serial number carrying the pilot in the WLAN and the WLAN symbol. Demodulating all the pilots in the signal, and acquiring phase tracking information according to the pilot; the data demodulating module 13 is configured to perform phase compensation and solution on the data in the signal according to the phase tracking information. Tune the data.
  • the apparatus of the present embodiment is suitable for a wireless local area network (WLAN) WLAN system in which the subcarrier spacing is reduced and the number of subcarriers is increased as compared with the standard specified by IEEE 802.11ac/lla/l lg/lln of the Institute of Electrical and Electronics Engineers.
  • the device in this embodiment receives the signal sent by the transmitting device, and according to the deployment of the pilot in the frequency domain and the time domain, that is, according to the subcarrier pattern diagrams described in the foregoing embodiments, which REs are learned.
  • the pilot is carried, the pilots are demodulated, and the phase tracking information of the received signal is obtained according to the pilot.
  • the phase tracking information includes information such as the phase offset of the signal, and the receiving device compares the data in the signal according to the phase tracking information. This phase can be accurately demodulated after phase compensation.
  • the device in this embodiment obtains signal phase tracking information according to the deployment situation of the pilot in the frequency domain and the time domain, and accurately demodulates the data in the signal, thereby realizing system performance and throughput. High, eliminating the effects of residual frequency offset and phase noise generated by the system, effectively reducing the packet error rate.
  • the pilot processing module 12 is specifically configured to: according to the first symbol of the WLAN that carries the pilot, according to the resource element RE corresponding to the subcarrier number of the bearer carrying pilot Calculating a first phase offset on the RE according to a frequency calculation; calculating, by using a linear interpolation method, a second phase offset phase offset on an RE that does not carry the pilot according to the first phase offset; The first phase offset and the second phase offset determine a phase deviation caused by residual frequency offset and phase noise, and calculate the phase tracking information.
  • the symbol of the signal received by the receiving device may be a symbol carrying a pilot, or may be a symbol without a pilot, if the pilot is carried.
  • the first symbol the device first calculates a first phase offset of the RE carrying the pilot according to the pilot, and then calculates the first symbol by using a linear interpolation method according to the calculated first phase offset. There is no second phase offset on the RE carrying the pilot.
  • the receiving device first carries the guidance carried on RE ( 1, -84), RE ( 1, -28 ), RE ( 1, 28) , RE ( 1, 84).
  • the pilot processing module 12 is specifically configured to calculate, according to the first phase offset, a linear interpolation method according to the first phase offset on the second symbol of the WLAN that does not carry the pilot. a third phase offset on the RE of the frequency RE of the same frequency band; calculating, according to the third phase offset, a fourth phase offset on the RE of the different frequency band of the RE carrying the pilot by linear interpolation And determining a phase deviation caused by residual frequency offset and phase noise according to the third phase offset and the fourth phase offset, and calculating the phase tracking information.
  • the apparatus first calculates a third phase offset on the RE in the same frequency band as the RE carrying the pilot by linear interpolation according to the first phase offset. And calculating a fourth phase offset on the other REs on the second symbol by linear interpolation according to the third phase offset.
  • RE (1, -84), RE (1, -28), RE (1, 28), RE (1, 84), RE (3, - 84), RE (3, -28), RE (3, 28), RE (3, 84) after the first phase offset can be based on The first phase offset of RE ( 1, -84) and RE (3, -84) is calculated by linear interpolation
  • the third phase offset of (4, -84), and so on, can calculate the third phase offset on RE (4, -28), RE (4, 28), RE (4, 84), and then Calculating a fourth phase offset on the other REs on the symbol 4 by linear interpolation according to the third phase offsets, and determining the residual frequency offset on the symbol 4 according to the third phase offset and the fourth phase offset. Phase deviation caused by phase noise, and phase tracking information of all REs on symbol 4 is calculated.
  • the pilot processing module 12 may calculate the third phase offset by using a method of linear interpolation according to the first phase offset on the first symbol before the second symbol.
  • the third phase offset on the symbol may further be that the second symbol is calculated by linear interpolation according to the first phase offset on the first symbol before and after the second symbol The third phase offset.
  • the receiving end device may calculate the pilot on the symbol 4 by using the pilots on the symbols 1 and 3 as in the above embodiment, or may adopt The pilot on symbol 3 and symbol 5 calculates the pilot on symbol 4, which is not specifically limited herein.
  • the first method is slightly better than the second method, because according to the actual situation of the next generation WLAN, each frame has a long training sequence in front, and the first symbol of each resource block is set to be carried. Pilot information, so any one of the symbols without pilot information can find the two pilot information in front of it, and not every symbol without pilot information, after which the pilot information can be found.
  • FIG. 10 is a flowchart of Embodiment 1 of a method for processing a pilot of a wireless local area network according to the present invention. As shown in FIG. 10, the method in this embodiment may include:
  • Step 101 Determine a total number of pilot subcarriers in the WLAN in the frequency domain.
  • the executor of this embodiment may be a transmitting device.
  • the method in this embodiment is applicable to the IEEE 802. 1 lac/1 la/1 lg/1 In The standard specified, the WLAN system with reduced subcarrier spacing and increased number of subcarriers.
  • Step 102 Determine, in the frequency domain, a sequence number of a subcarrier carrying a pilot in the WLAN according to a total number of the pilot subcarriers;
  • the source device has determined the total number of pilot subcarriers, and the pilots need to be deployed in the subcarriers of the WLAN.
  • the pilot subcarriers can be uniformly distributed throughout the WLAN. In the bandwidth, that is, the interval between adjacent subcarriers carrying pilots is equal
  • the subcarrier numbers carrying the pilots are determined.
  • the subcarriers in the middle of the subcarriers of the WLAN are DC subcarriers, and the sequence number of the DC subcarriers is 0, and the absolute values of the two sides are gradually symmetrically increased. The difference is that the sequence number of one side is positive, and the sequence number of one side is negative. Therefore, each subcarrier corresponds to a unique subcarrier sequence number, and the subcarrier number carrying the pilot is determined, that is, the position of the pilot in the frequency domain is determined.
  • Step 103 In the time domain, the pilot is uniformly carried in the symbol of the WLAN.
  • the transmitting device uniformly carries the pilot in the symbol of the WLAN, and the WLAN is in the time domain.
  • the OFDM symbol is divided into consecutive OFDM symbols.
  • the pilots are continuously carried on all the symbols, which also causes the system overhead to greatly affect the throughput.
  • the present invention changes the deployment situation.
  • the pilots are no longer used. It is a continuous placement, and it only needs to be uniformly carried in the symbols of the WLAN.
  • the so-called uniform bearer can place one pilot for each several symbols, and the system performance and system overhead should also be considered in several symbols. In terms of aspect, take the compromise.
  • Step 104 Send a signal to the receiving end device according to the subcarrier serial number carrying the pilot and the symbol, so that the receiving end device acquires phase tracking information according to the pilot in the signal, and further The data in the signal is phase compensated and demodulated.
  • the transmitting device has uniformly mapped the pilot to the subcarriers and symbols of the system by using the two dimensions of the frequency domain and the time domain, for example, according to the subcarrier pattern shown in FIG. 2 to the receiving device.
  • Transmitting a signal the signal includes data carried on the pilot and other subcarriers, and the receiving device acquires phase tracking information according to the pilot in the signal, and then phase compensates the data according to the phase tracking information to accurately demodulate the data. , reduce the packet error rate.
  • the step 102 of the foregoing method embodiment is to determine, according to the total number of the pilot subcarriers, the subcarrier number of the pilot that carries the pilot in the frequency domain
  • the specific implementation method may be: Configuring, in the frequency domain, the pilots are symmetrically and uniformly distributed on both sides of the DC subcarriers of the WLAN according to the total number of the pilot subcarriers, to determine the subcarrier sequence number of the pilot bearer; or And in the frequency domain, the pilot is uniformly deployed on the entire bandwidth of the WLAN according to the total number of the pilot subcarriers to determine the subcarrier number of the bearer.
  • the WLAN DC subcarriers are used as the axis, and the pilots are symmetrically and uniformly deployed on the upper and lower sides, that is, the subcarriers carrying the pilots are in the sub-carriers.
  • the subcarrier numbers On both sides of the subcarrier with the carrier number 0, the subcarrier numbers have the same absolute value, one side is positive and one side is negative.
  • the other is to uniformly distribute the pilots in the entire bandwidth of the WLAN, that is, adjacent bearers.
  • the spacing between the subcarriers of the pilot is equal or close.
  • the method further includes: acquiring the number of subcarriers of the WLAN is the same as the WLAN bandwidth specified in the Institute of Electrical and Electronics Engineers IEEE802.11ac/lla/l lg/lln a multiple of the number of subcarriers of the system is expanded; Step 102: In the frequency domain, determining a subcarrier number of the pilot that carries the pilot in the WLAN according to the total number of the pilot subcarriers, and the specific implementation method may be: And in the frequency domain, the subcarrier number carrying the pilot in the system with the same bandwidth as the WLAN specified in the IEEE802.11ac/lla/l lg/lln according to the total number of the pilot subcarriers The multiple is expanded to obtain a subcarrier number carrying the pilot in the WLAN.
  • step 102 of the foregoing method embodiment is at the frequency. Determining, according to the total number of the pilot subcarriers, the subcarrier number of the pilot in the WLAN, the specific implementation method may be: in the frequency domain, according to the total number of the pilot subcarriers Obtaining a sub-carrier number of the pilot that carries a 20 MHz bandwidth and the number of the sub-carriers is half of the number of sub-carriers of the WLAN, and performing an expansion process on the sub-carrier number of the pilot to obtain the WLAN The subcarrier number carrying the pilot on the half of the bandwidth; determining the subcarrier carrying the pilot on the symmetric half of the bandwidth of the WLAN according to the subcarrier number carrying the pilot on the half bandwidth of the WLAN Serial number.
  • the step 102 of the foregoing method embodiment is to determine, according to the total number of the pilot subcarriers, the subcarrier number of the pilot that carries the pilot in the frequency domain
  • the specific implementation method may be: Selecting, in the frequency domain, the pilot in the WLAN from the number of 16 pilot-bearing subcarriers in the 160 MHz bandwidth system specified in the IEEE802.11ac according to the total number of pilot subcarriers.
  • the subcarrier number, the number of the subcarrier numbers is equal to the total number of the pilot subcarriers, and the subcarrier numbers are evenly distributed over the entire bandwidth of the WLAN.
  • the pilot is uniformly received in the time domain.
  • the specific implementation method may be: carrying the pilot on the symbol of the WLAN every at least one of the symbols on the symbol of the WLAN.
  • the pilot may be carried on every one or three of the symbols on the symbol of the WLAN on the time domain.
  • the apparatus in this embodiment deploys a pilot in the time domain, it is no longer a symbol, and may be at least one symbol-bearing pilot.
  • the pilot may be carried every other symbol.
  • the pilot is carried every three symbols, which can reduce the overhead of the system carrying pilots and improve system throughput.
  • the method of the foregoing embodiment is separately deployed in the frequency domain and the time domain to determine the RE of the final bearer.
  • the following describes several specific embodiments.
  • the WLAN bandwidth is 20 MHz and the number of subcarriers is 128, in the frequency domain, determining that the total number of pilot subcarriers in the WLAN is four, and in the frequency domain, according to The total number of pilot subcarriers determines that the subcarrier number of the pilot in the WLAN is -42, -14, 14, 42, and the specific pilot distribution can be seen in FIG.
  • the WLAN bandwidth is 20 MHz and the number of subcarriers is 256, determining, in the frequency domain, that the total number of pilot subcarriers in the WLAN is four, and in the frequency domain, according to The total number of the pilot subcarriers determines that the subcarriers carrying the pilots in the WLAN are -84, -28, 28, 84.
  • the specific pilot distribution can be seen in FIG. 4A and FIG. 4B.
  • the WLAN bandwidth is 20 MHz and the number of subcarriers is 512, determining, in the frequency domain, that the total number of pilot subcarriers in the WLAN is four, and in the frequency domain, according to The total number of the pilot subcarriers determines that the subcarriers carrying the pilots in the WLAN are -168, -56, 56, 168, and the specific pilot distribution can be seen in FIG.
  • the WLAN bandwidth is 20 MHz and the number of subcarriers is 1024, determining, in the frequency domain, that the total number of pilot subcarriers in the WLAN is four, and in the frequency domain, according to The total number of pilot subcarriers determines that the subcarrier number of the pilot in the WLAN is -336, -112, 112, 336, and the specific pilot distribution can be seen in FIG. 6.
  • the total number of pilot subcarriers in the WLAN is determined to be six in the frequency domain, and in the frequency domain, according to The total number of the pilot subcarriers determines that the subcarriers carrying the pilots in the WLAN are -106, -50, -22, 22, 50, 106.
  • the specific pilot distribution can be seen in FIG.
  • the WLAN bandwidth is 40 MHz and the number of subcarriers is 256
  • determining, in the frequency domain, that the total number of pilot subcarriers in the WLAN is eight, and in the frequency domain, according to The total number of pilot subcarriers determines that the subcarrier numbers of the pilots in the WLAN are -106, -78, -50, -22, 22, 50, 78, 106, and the specific pilot distribution may be See Figure 8.
  • the total number of pilot subcarriers in the WLAN is determined to be six in the frequency domain, and in the frequency domain, according to The total number of pilot subcarriers determines that the subcarrier numbers carrying the pilots in the WLAN are -212, -100, -44, 44, 100, 212.
  • the total number of pilot subcarriers in the WLAN is determined to be eight in the frequency domain, and in the frequency domain, according to The total number of pilot subcarriers determines that the subcarrier numbers carrying the pilots in the WLAN are -212, -156, -100, -44, 44, 100, 156, 212.
  • the WLAN bandwidth is 40 MHz and the number of subcarriers is 1024, determining, in the frequency domain, that the total number of pilot subcarriers in the WLAN is six, and in the frequency domain, according to The total number of pilot subcarriers determines that the subcarrier numbers carrying the pilots in the WLAN are -424, -200, -88, 88, 200, 424.
  • the WLAN bandwidth is 40 MHz and the number of subcarriers is 1024, determining, in the frequency domain, that the total number of pilot subcarriers in the WLAN is eight, and in the frequency domain, according to The total number of pilot subcarriers determines that the subcarrier numbers carrying the pilots in the WLAN are -424, -312, -200, -88, 88, 200, 312, 424.
  • the total number of pilot subcarriers in the WLAN is determined to be six in the frequency domain, and in the frequency domain, according to The total number of pilot subcarriers determines that the subcarrier numbers carrying the pilots in the WLAN are -848, -400, -176, 176, 400, 848.
  • the WLAN bandwidth is 40 MHz and the number of subcarriers is 2048, in the frequency domain, determining a total number of pilot subcarriers in the WLAN is eight, and in the frequency domain, according to The total number of pilot subcarriers determines that the subcarrier numbers carrying the pilots in the WLAN are -848, -624, -400, -176, 176, 400, 624, 848.
  • the WLAN bandwidth is 80 MHz and the number of subcarriers is 512, determining, in the frequency domain, that the total number of pilot subcarriers in the WLAN is eight, and in the frequency domain, according to The total number of pilot subcarriers determines that the subcarrier numbers carrying the pilots in the WLAN are -206, -150, -78, -22, 22, 78, 150, 206.
  • the WLAN bandwidth is 80 MHz and the number of subcarriers is 1024, determining, in the frequency domain, that the total number of pilot subcarriers in the WLAN is eight, and in the frequency domain, according to The total number of pilot subcarriers determines that the subcarrier numbers carrying the pilots in the WLAN are -412, -300, -156, -44, 44, 156, 300, 412.
  • the WLAN bandwidth is 80 MHz and the number of subcarriers is 2048, in the frequency domain, determining that the total number of pilot subcarriers in the WLAN is eight, and in the frequency domain, according to The total number of pilot subcarriers determines that the subcarrier numbers carrying the pilots in the WLAN are -824, -600, -312, -88, 88, 312, 600, 824.
  • the WLAN bandwidth is 80 MHz and the number of subcarriers is 4096, determining, in the frequency domain, that the total number of pilot subcarriers in the WLAN is eight, and in the frequency domain, according to The total number of pilot subcarriers determines that the subcarrier numbers carrying the pilots in the WLAN are -1648, -1200, -624, -176, 176, 624, 1200, 1648.
  • the total number of pilot subcarriers in the WLAN is determined to be 16 in the frequency domain, and in the frequency domain, according to The total number of pilot subcarriers determines that the subcarrier numbers carrying the pilots in the WLAN are -462, -406, -334, -278, -234, -178, -106, -50, 50, 106, 178, 234, 278, 334, 406, 462.
  • the total number of pilot subcarriers in the WLAN is determined to be 16 in the frequency domain, and in the frequency domain, according to The total number of pilot subcarriers determines that the subcarrier numbers carrying the pilots in the WLAN are -924, -812, -668, -556, -468, -356, -212, -100, 100, 212, 356, 468, 556, 668, 812, 924.
  • the total number of pilot subcarriers in the WLAN is determined to be 16 in the frequency domain, and in the frequency domain, according to The total number of pilot subcarriers determines that the subcarrier numbers carrying the pilots in the WLAN are -1848, -1624, -1336, -1112, -936, -712, -424, -200, 200, 424, 712, 936, 1112, 1336, 1624, 1848.
  • the total number of pilot subcarriers in the WLAN is determined to be 16 in the frequency domain, and in the frequency domain, according to The total number of pilot subcarriers determines that the subcarrier numbers carrying the pilots in the WLAN are -3696, -3248, -2672, -2224, -1872, -1424, -848, -400, 400, 848, 1424, 1872, 2224, 2672, 3248, 3696.
  • FIG. 11 is a flowchart of Embodiment 2 of a method for processing a pilot of a wireless local area network according to the present invention. As shown in FIG. 11, the method in this embodiment may include:
  • Step 201 Receive a signal sent by the sending end device over the entire bandwidth of the WLAN of the wireless local area network
  • the execution body of this embodiment may be a receiving end device, and the method of the embodiment is suitable for reducing the subcarrier spacing compared to the standard specified by the Institute of Electrical and Electronics Engineers IEEE 802.1 lac/1 la/1 lg/1 In, A wireless local area network WLAN system with increased number of subcarriers.
  • Step 202 Demodulate all the pilots from the received signal according to the subcarrier number carrying the pilot in the WLAN and the symbol of the WLAN, and acquire a phase according to the pilot.
  • the receiving device demodulates the pilot according to the deployment of the pilot in the frequency domain and the time domain, and calculates the phase offset of the RE on the received symbol according to the pilot.
  • the phase tracking information is determined, and the process is similar to the foregoing device embodiment, and details are not described herein again.
  • Step 203 Perform phase compensation on the data in the signal according to the phase tracking information and demodulate the data.
  • the signal phase tracking information is obtained according to the deployment situation of the pilot in the frequency domain and the time domain, and the data in the signal is accurately demodulated, thereby improving system performance and throughput, and eliminating residual frequency generated by the system.
  • the effects of bias and phase noise effectively reduce the packet error rate.
  • step 202 of the foregoing method embodiment demodulates all the pilots from the received signal according to the subcarrier number carrying the pilot in the WLAN and the symbol of the WLAN, and according to the guide Obtaining phase tracking information
  • the specific implementation method may be: performing, according to the resource element RE corresponding to the subcarrier number of the bearer carrying pilot, on the first symbol of the WLAN that carries the pilot Pilot calculation to obtain a first phase offset on the RE; Calculating, according to the first phase offset, a second phase offset phase offset on the RE that does not carry the pilot by using a linear interpolation method; determining, by the residual according to the first phase offset and the second phase offset The phase deviation caused by the frequency offset and phase noise, and the phase tracking information is calculated.
  • step 202 of the foregoing method embodiment demodulates all the pilots from the received signal according to the subcarrier number carrying the pilot in the WLAN and the symbol of the WLAN, and according to the guide Obtaining phase tracking information
  • the specific implementation method may be: calculating, according to the first phase offset, a linear interpolation method according to the first phase offset on the second symbol of the WLAN that does not carry the pilot a third phase offset on the RE of the same frequency band of the RE of the pilot; calculating a fourth phase offset on the RE of the different frequency band of the RE carrying the pilot by linear interpolation according to the third phase offset Shifting; determining a phase deviation caused by residual frequency offset and phase noise based on the third phase offset and the fourth phase offset, and calculating the phase tracking information.
  • the method of calculating the third phase offset may be, according to the second symbol of the WLAN that does not carry the pilot, according to the first phase offset on the first symbol before the second symbol Calculating the third phase offset on the second symbol by using a method of linear interpolation, and may also be on the second symbol of the WLAN that does not carry the pilot, according to the second symbol
  • the first phase offset on the first symbol before and after is calculated using a linear interpolation method to calculate the third phase offset on the second symbol.
  • the WLAN that reduces the subcarrier spacing and increases the number of subcarriers may include: a processor 11 and a transmitter 12, where the processor 11 is configured to determine, in the frequency domain, the total number of pilot subcarriers in the WLAN in the WLAN.
  • the transmitter 12 is configured to send a signal to the receiving end device according to the subcarrier serial number carrying the pilot and the symbol, so that the receiving end device acquires phase tracking according to the pilot in the signal.
  • the information in turn, phase compensates and demodulates the data in the signal.
  • the device of this embodiment may be used to implement the technical solution of the method embodiment shown in FIG. 10,
  • the implementation principle is similar to the technical effect, and will not be described here.
  • the processor 11 is specifically configured to, in the frequency domain, deploy the pilot symmetrically and uniformly on both sides of the DC subcarrier of the WLAN according to the total number of the pilot subcarriers, to Determining the subcarrier number of the pilot bearer; or, in the frequency domain, uniformly deploying the pilot on the entire bandwidth of the WLAN according to the total number of the pilot subcarriers, to determine The subcarrier number carrying the pilot.
  • the processor 11 is specifically configured to acquire the subcarriers of the WLAN with the same number of subcarriers as the WLAN bandwidth specified in the Institute of Electrical and Electronics Engineers IEEE802.11ac/lla/llg/l a multiple of the number of expansions; in the frequency domain, the same as the WLAN bandwidth specified in the IEEE 802.1 lac/1 la/1 lg/1 In according to the total number of pilot subcarriers The subcarrier number carrying the pilot in the system is expanded by the multiple, and the subcarrier number carrying the pilot in the WLAN is obtained.
  • the processor 11 is specifically configured to determine, in the frequency domain, that the total number of pilot subcarriers in the WLAN is eight;
  • the subcarrier number of the pilot that acquires the 20 MHz bandwidth according to the total number of the pilot subcarriers and the number of the subcarriers is half of the number of subcarriers of the WLAN, and the pilot
  • the frequency subcarrier sequence number is expanded to obtain a subcarrier number carrying the pilot on a half of the bandwidth of the WLAN; determining a symmetry of the WLAN according to a subcarrier number carrying the pilot on a half bandwidth of the WLAN The other half of the bandwidth carries the subcarrier number of the pilot.
  • the processor 11 is specifically configured to, in the frequency domain, 16 pilot-bearing subcarriers in a 160 MHz bandwidth system specified in the IEEE802.11ac according to the total number of the pilot subcarriers.
  • the number of the subcarriers carrying the pilots in the WLAN is selected, the number of the subcarrier numbers is equal to the total number of the pilot subcarriers, and the subcarrier number is in the entire bandwidth of the WLAN. Evenly distributed.
  • the processor 11 is specifically configured to carry the pilot every at least one of the symbols on the symbol of the WLAN in the time domain.
  • the processor 11 is specifically configured to carry the pilot every other one or three of the symbols on the symbol of the WLAN in the time domain.
  • FIG. 13 is a schematic structural diagram of an embodiment of a receiving end device according to the present invention.
  • the device in this embodiment is applicable to an IEEE802.11ac/l la/llg/l ln specification of the Institute of Electrical and Electronics Engineers.
  • the predetermined standard, the WLAN with reduced subcarrier spacing and the number of subcarriers is increased, and may include: a receiver 11 and a processor 12, where the receiver 11 is configured to receive the transmitting device and send the entire bandwidth of the WLAN over the WLAN.
  • the processor 12 is configured to demodulate all the pilots from the received signal according to the subcarrier sequence number carrying the pilot in the WLAN and the symbol of the WLAN, and according to the pilot Acquiring phase tracking information; phase compensating data in the signal according to the phase tracking information and demodulating the data.
  • the device in this embodiment may be used to implement the technical solution of the method embodiment shown in FIG. 11.
  • the implementation principle and technical effects are similar, and details are not described herein again.
  • the processor 12 is specifically configured to calculate, according to the pilot element carried on the resource element RE corresponding to the subcarrier number of the bearer pilot, on the first symbol of the WLAN that carries the pilot Obtaining a first phase offset on the RE; calculating, by using a linear interpolation method, a second phase offset phase offset on an RE that does not carry the pilot according to the first phase offset; The phase offset and the second phase offset determine a phase deviation caused by residual frequency offset and phase noise, and calculate the phase tracking information.
  • the processor 12 is specifically configured to calculate, by using a linear interpolation method, the method for performing the pilot according to the first phase offset on a second symbol of the WLAN that does not carry the pilot. a third phase offset on the RE of the same frequency band; calculating, according to the third phase offset, a fourth phase offset on the RE of the different frequency band of the RE carrying the pilot by using a linear interpolation method; The third phase offset and the fourth phase offset determine a phase deviation caused by residual frequency offset and phase noise, and calculate the phase tracking information.
  • the processor 12 is specifically configured to, according to the second symbol of the WLAN that does not carry the pilot, according to the first phase offset on the first symbol before the second symbol Calculating the third phase offset on the second symbol by using a method of linear interpolation; calculating, by using a linear interpolation method, a RE of a different frequency band from the RE carrying the pilot according to the third phase offset a fourth phase offset; determining a phase deviation caused by residual frequency offset and phase noise based on the third phase offset and the fourth phase offset, and calculating the phase tracking information.
  • the processor 12 is specifically configured to: according to the second symbol of the WLAN that does not carry the pilot, according to the first symbol on the first symbol before and after the second symbol Phase offset using a method of linear interpolation to calculate the third phase offset on the second symbol; calculating, by the method of linear interpolation, the RE carrying the pilot according to the third phase offset a fourth phase offset on the RE of the different frequency bands; determining a phase deviation caused by the residual frequency offset and the phase noise based on the third phase offset and the fourth phase offset, and calculating the phase tracking information.
  • Embodiment 1 of a communication system is a schematic structural diagram of Embodiment 1 of a communication system according to the present invention.
  • the system of this embodiment is applicable to the IEEE 802.1 lac/1 la/1 lg/1 In specified by the Institute of Electrical and Electronics Engineers.
  • the standard the sub-carrier spacing is reduced, and the number of sub-carriers is increased.
  • the WLAN includes: a transmitting device 11 and a receiving device 12, wherein the transmitting device 11 can adopt the structure of any device embodiment of FIG. 1 to FIG.
  • the technical solution of the method embodiment shown in FIG. 10 can be performed, and the implementation principle and technical effects are similar, and details are not described herein.
  • the receiving end device 12 can adopt the structure of the device embodiment shown in FIG.
  • the technical solution of the method embodiment shown in FIG. 11 can be performed, and the implementation principle and the technical effect are similar, and details are not described herein again.
  • Embodiment 2 of a communication system is a schematic structural diagram of Embodiment 2 of a communication system according to the present invention.
  • the system of this embodiment is applicable to a standard specified by IEEE 802.11ac/l la/llg/lln of the Institute of Electrical and Electronics Engineers.
  • the WLAN that reduces the number of subcarriers and the number of subcarriers is reduced, and includes: a transmitting device 21 and a receiving device 22, wherein the transmitting device 21 can adopt the structure of the device embodiment shown in FIG. 12, which can be executed correspondingly.
  • the technical solution of the method embodiment shown in FIG. 10 is similar to the technical effect, and is not described here.
  • the receiving device 22 can adopt the structure of the device embodiment shown in FIG. 13 , and correspondingly, FIG. 11 can be executed.
  • the technical solution of the method embodiment is similar, and the implementation principle and the technical effect are similar, and details are not described herein again.
  • the disclosed apparatus and method may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not executed.
  • the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical, mechanical or otherwise.
  • the units described as separate components may or may not be physically separated, and the components displayed as the unit may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. . Some or all of the units may be selected according to actual needs to achieve the objectives of the solution of the embodiment.
  • each functional unit in various embodiments of the present invention may be integrated into one processing unit
  • each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional units.
  • the above-described integrated unit implemented in the form of a software functional unit can be stored in a computer readable storage medium.
  • the software functional unit is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to perform the method of various embodiments of the present invention. Part of the steps.
  • the foregoing storage medium includes: a U disk, a removable hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. .

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Abstract

L'invention concerne un procédé et un dispositif de traitement de pilote pour un réseau local sans fil, et un système de communication. Un dispositif côté émission de la présente invention comprend : un module de détermination de nombre de pilotes utilisé pour déterminer le nombre total de sous-porteuses pilotes dans un réseau local sans fil (WLAN) dans un domaine fréquentiel; un module de déploiement dans le domaine fréquentiel utilisé pour déterminer le numéro de série de sous-porteuses transportant des fréquences pilotes dans le WLAN en fonction du nombre total de sous-porteuses pilotes dans le domaine fréquentiel; un module de déploiement dans le domaine temporel utilisé pour transporter uniformément les fréquences pilotes dans un symbole du WLAN dans un domaine temporel; et un module émetteur de signal utilisé pour envoyer un signal au dispositif côté réception selon le numéro de série des sous-porteuses transportant les fréquences pilotes et le symbole, de manière que le dispositif côté réception acquiert des informations de poursuite de phase selon les fréquences pilotes dans le signal, et effectue ainsi une compensation de phase et une démodulation sur les données dans le signal. La présente invention élimine l'influence d'un décalage de fréquence résiduel et d'un bruit de phase généré par un système, ce qui permet de réduire efficacement le taux d'erreur sur les paquets.
PCT/CN2014/073476 2014-03-14 2014-03-14 Procédé et dispositif de traitement de pilote pour réseau local sans fil, et système de communication WO2015135217A1 (fr)

Priority Applications (2)

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