WO2016138659A1 - 相位偏差计算方法、接入点及站点 - Google Patents

相位偏差计算方法、接入点及站点 Download PDF

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Publication number
WO2016138659A1
WO2016138659A1 PCT/CN2015/073684 CN2015073684W WO2016138659A1 WO 2016138659 A1 WO2016138659 A1 WO 2016138659A1 CN 2015073684 W CN2015073684 W CN 2015073684W WO 2016138659 A1 WO2016138659 A1 WO 2016138659A1
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pilot
station
stations
sequence
frequency
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PCT/CN2015/073684
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English (en)
French (fr)
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吴涛
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华为技术有限公司
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Priority to PCT/CN2015/073684 priority Critical patent/WO2016138659A1/zh
Publication of WO2016138659A1 publication Critical patent/WO2016138659A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements

Definitions

  • Embodiments of the present invention relate to communication technologies, and in particular, to a phase deviation calculation method, an access point, and a station.
  • Wireless-Fidelity (WiFi) technology is the main technical standard of the Wireless Local Area Networks (WLAN) system, and the technical standards established by the Institute of Electrical and Electronics Engineers (IEEE).
  • IEEE Institute of Electrical and Electronics Engineers
  • 802.11 in various versions such as 802.11a, 802.11b, 802.11d, 802.11n and 802.11ac, the technology development has become more and more mature, and the transmission speed is also getting higher and higher.
  • the unique flexibility of WiFi technology it has become more and more used in home and business environments.
  • the receiver performs a baseband processing procedure on the received signal, which mainly includes: symbol synchronization, channel estimation, and data preprocessing.
  • the symbol synchronization refers to performing symbol synchronization according to the received Short Training Field (STF) and the received signal, and implementing frequency synchronization and time synchronization between the transmitter and the receiver.
  • the channel estimation is actually using the received Long Training Field (LTF) for channel estimation to obtain channel information.
  • the data pre-processing actually refers to channel equalization of the signal according to the channel information obtained by the channel estimation to eliminate the influence of the channel.
  • the receiver can implement frequency synchronization between the transmitter and the receiver according to the STF, it is impossible to achieve complete frequency synchronization, and thus there is a certain residual frequency offset.
  • Embodiments of the present invention provide a phase deviation calculation method, an access point, and a station to solve the problem of a high bit error rate of a received signal caused by a phase deviation caused by a residual frequency offset.
  • an embodiment of the present invention provides a phase deviation calculation method, including:
  • An access point determines a frequency domain sequence of the hybrid pilot sequence, wherein the hybrid pilot sequence includes pilot sequences of a plurality of stations;
  • the access point extracts, according to a pilot model of each of the multiple sites, a subsequence corresponding to each of the sites from the frequency domain sequence; wherein, a frequency of a pilot model of each of the sites
  • the offset generated by the phase deviation of each of the stations is different from the offset of the frequency of the pilot models of other stations to the phase deviation of the other stations;
  • the other stations are the plurality of wireless local area networks Sites outside each site described in the site;
  • the access point determines a phase offset of each of the stations based on a pilot sequence of each of the stations.
  • the method before the determining, by the access point, the frequency domain sequence of the mixed pilot sequence, the method further includes:
  • the access point allocates a pilot model to each of the multiple sites
  • the access point transmits a pilot model assigned to the plurality of sites to the plurality of sites, respectively.
  • an embodiment of the present invention provides a phase deviation calculation method, including:
  • the station transmits the generated pilot signal.
  • the method before the station generates a pilot signal according to the pilot model of the station, the method also includes:
  • the station receives a pilot model of the station assigned by an access point.
  • an embodiment of the present invention provides an access point, including:
  • a determining module configured to determine a frequency domain sequence of the mixed pilot sequence, wherein the mixed pilot sequence includes a pilot sequence of a plurality of stations;
  • an extracting module configured to extract a subsequence corresponding to each of the sites from the frequency domain sequence according to a pilot model of each of the multiple sites; wherein, a frequency of a pilot model of each site
  • the offset generated by the phase deviation of each of the stations is different from the offset of the frequency of the pilot models of other stations to the phase deviation of the other stations;
  • the other stations are the plurality of wireless local area networks Sites outside each site described in the site;
  • a generating module configured to generate, according to the sub-sequence corresponding to each station, a pilot sequence of each station;
  • the determining module is further configured to determine a phase deviation of each of the stations according to a pilot sequence of each of the stations.
  • the access point further includes:
  • An allocating module configured to allocate a pilot model to each of the plurality of stations before the determining module determines the frequency domain sequence of the mixed pilot sequence
  • a sending module configured to separately send a pilot model allocated to the multiple sites to the multiple sites.
  • an embodiment of the present invention provides a site, including:
  • Generating a module configured to generate a pilot signal according to a pilot model of the station, where a frequency of a pilot model of the station generates an offset from a phase deviation of the station, different from a pilot model of another station An offset of the frequency deviation from the phase deviation of the other stations;
  • the other site is a site outside the site in the wireless local area network;
  • a sending module configured to send the generated pilot signal.
  • the site further includes:
  • a receiving module configured to receive, before the generating module generates a pilot signal according to the pilot model of the station, a pilot model of the station allocated by the access point.
  • an embodiment of the present invention provides an access point, including: a receiver, a processor, and a transmitter;
  • the processor is configured to determine a frequency domain sequence of the mixed pilot sequence, and extract a subsequence corresponding to each site from the frequency domain sequence according to a pilot model of each of the multiple sites. Generating, according to the sub-sequence corresponding to each station, a pilot sequence of each station, and determining a phase deviation of each station according to a pilot sequence of each station;
  • the hybrid pilot sequence includes a pilot sequence of a plurality of stations; a frequency of a pilot model of each of the stations produces an offset from a phase offset of each of the stations, different from pilots of other stations.
  • the frequency of the model is offset from the phase deviation of the other stations; the other stations are stations outside each of the plurality of stations in the wireless local area network.
  • the processor is further configured to determine, at the processor, the frequency of the mixed pilot sequence Prior to the domain sequence, a pilot model is assigned to each of the plurality of sites;
  • the transmitter is configured to separately send pilot models of the multiple sites to the multiple sites.
  • an embodiment of the present invention provides a station, including: a receiver, a processor, and a transmitter;
  • the processor is configured to generate a pilot signal according to a pilot model of the station, where a frequency of a pilot model of the station is offset from a phase deviation of the station, different from that of other stations.
  • the frequency of the pilot model is offset from the phase deviation of the other stations; the other stations are stations outside the station in the wireless local area network;
  • the transmitter is configured to send the generated pilot signal.
  • the receiver is configured to generate, at the processor, a pilot signal according to a pilot model of the station Previously, the pilot model of the site assigned by the access point was received.
  • Embodiments of the present invention provide a phase offset calculation method, an access point, and a station, where a frequency domain sequence of a mixed pilot sequence is determined by an access point, where the mixed pilot sequence includes pilot sequences of multiple sites, since each The frequency of the pilot model of the station is offset from the phase deviation of each station, and the frequency of the pilot model of other stations is offset from the phase deviation of the other stations, so the access station can be based on a pilot model of each of the plurality of sites extracts a subsequence corresponding to each site from the sequence of the frequency domain, and then generates a pilot sequence of each site according to the subsequence corresponding to each site, and according to The pilot sequence of each station determines the phase deviation of each station, so that phase compensation can be performed according to the phase deviation of the transmitting antennas of each station, and the error rate of the received signal caused by the residual deviation is reduced.
  • FIG. 1 is a schematic diagram of a applicable scenario of a phase deviation calculation method according to various embodiments of the present invention
  • FIG. 3 is a flowchart of a phase deviation calculation method according to Embodiment 2 of the present invention.
  • FIG. 5 is a flowchart of a phase deviation calculation method according to Embodiment 4 of the present invention.
  • FIG. 6 is a flowchart of a phase deviation calculation method according to Embodiment 5 of the present invention.
  • FIG. 9 is a schematic structural diagram of an access point according to Embodiment 7 of the present invention.
  • FIG. 10 is a schematic structural diagram of a station according to Embodiment 8 of the present invention.
  • FIG. 11 is a schematic structural diagram of an access point according to Embodiment 9 of the present invention.
  • FIG. 12 is a schematic structural diagram of a station according to Embodiment 10 of the present invention.
  • FIG. 1 is a schematic diagram of an applicable scenario of a phase deviation calculation method according to various embodiments of the present invention.
  • the WLAN network system may include one access point 101 and at least two sites 102.
  • the access point 101 includes at least two receive antennas, each of which may include at least one transmit antenna.
  • the solution of this embodiment is applicable to the scenario that the access point receives the spatial stream of the at least two stations transmitting the spatial stream through the respective antennas through the at least two receiving antennas. Wherein each transmitting antenna can transmit a spatial stream.
  • a station which may also be called a user equipment, may be a wireless sensor, a wireless communication terminal or a mobile terminal, such as a mobile phone (or "cellular" phone) that supports WiFi communication function and has wireless communication function.
  • computer For example, it may be a portable, pocket-sized, handheld, computer-built, wearable, or in-vehicle wireless communication device that supports WiFi communication functions, and exchanges communication data such as voice and data with the wireless access network.
  • An access point also referred to as a wireless access point or bridge or hotspot, can access a server or a communication network.
  • Embodiment 1 of the present invention provides a phase deviation calculation method.
  • FIG. 2 is a flowchart of a phase deviation calculation method according to Embodiment 1 of the present invention. This method is performed by the access point. As shown in FIG. 2, the method provided in Embodiment 1 of the present invention may include:
  • the access point determines a frequency domain sequence of the mixed pilot sequence, where the mixed pilot sequence includes a pilot sequence of multiple sites.
  • the hybrid pilot sequence may be a time domain sample sequence of a time domain mixed signal of a pilot sequence transmitted by the plurality of stations in the wireless local area network received by the access point.
  • the access point determines a frequency domain sequence of the mixed pilot sequence, and may be a frequency domain sequence corresponding to a time domain sampling point obtained by performing a Discrete Fourier Transform (DFT) on the mixed pilot sequence.
  • DFT Discrete Fourier Transform
  • the mixed pilot sequence may be a mixed sequence of pilot sequences of the n stations in the time domain. The noise is ignored, the l th time-domain samples mixed conductor carrier access point on the sub-side m-th pilot pilot sequence may be r m (l).
  • the r m (l) can be expressed by the following formula (1).
  • r mn (l) is the time domain sampling point corresponding to the nth station in the first time domain sampling point.
  • h mn is the channel information of the transmitting antenna of the nth station in the WLAN on the pilot subcarrier m to the receiving antenna of the access point.
  • p n (l) is the lth time domain sampling point of the pilot model of the nth station.
  • ⁇ n can be the phase deviation of the nth site.
  • the phase deviation of the nth station is a phase deviation of a transmit antenna of the nth station to a receive antenna of the access point.
  • L is an integer power of 2, and the L is greater than or equal to 4.
  • the access point extracts a subsequence corresponding to each site from the frequency domain sequence according to a pilot model of each of the multiple sites; wherein, the frequency of the pilot model of each site is The offset generated by the phase deviation of the stations is different from the offset of the frequency of the pilot model of other stations to the phase deviation of the other stations; the other stations are outside the each of the multiple sites in the WLAN Other points.
  • the offset of the frequency of the pilot model of each station to the phase deviation of each station may actually be the frequency of the pilot model of each station. Pilot model for this other site
  • the offset of the frequency from the phase offset of the other station may be the frequency of the pilot model of the other station.
  • the frequency of the pilot model of each station is offset from the phase deviation of each station, and the frequency of the pilot model of other stations is offset from the phase deviation of the other stations.
  • the frequency of the pilot model of each station is different from the frequency of the pilot model of the other station.
  • the frequencies of the pilot models of the plurality of stations constitute an equal sequence, for example, the frequency of the pilot model of the nth station is n ⁇ , where ⁇ is a preset offset value.
  • the pilot sequences of the multiple stations may not constitute an equal sequence, and only the frequency of the pilot model of each station is required to be offset from the phase deviation of each station, unlike the pilots of other stations.
  • the frequency of the model may be offset from the phase deviation of the other stations. In this case, when extracting a subsequence of each station, it is necessary to use at least some of the frequencies of the pilot models of the plurality of stations and a preset offset value.
  • the access point extracts the sub-sequence corresponding to each station from the frequency domain sequence according to the pilot model of each of the multiple sites, which may be based on the frequency of the pilot model of each site, The frequency domain sequence is filtered to obtain a subsequence corresponding to each of the stations.
  • the frequency of the pilot model of the nth station in the WLAN is offset from the phase deviation of the nth station by ⁇ n (ie, the frequency of the pilot model of the nth station is ⁇ n )
  • the frequency of the pilot model of the n-1 station produces an offset of ⁇ n -1 for the phase deviation of the n-1th station (i.e., the frequency of the pilot model of the n-1th station is ⁇ n -1 ).
  • ⁇ n ⁇ ⁇ n-1 .
  • the sub-sequence corresponding to the nth site in the frequency domain sequence may be as shown in the formula (3).
  • the access point extracts the subsequence corresponding to the nth station from the frequency domain sequence according to the pilot model of the nth station, and may be other frequencies in the frequency domain sequence according to the frequency of the pilot model of the nth station.
  • the sequence of points is filtered to obtain a subsequence corresponding to the nth site. Specifically, it may be obtained by performing filtering according to the following formula (4).
  • the The subsequence corresponding to the nth station in the frequency domain sequence is the The subsequence corresponding to the nth station in the frequency domain sequence.
  • the access point generates a pilot sequence of each site according to the subsequence corresponding to each site.
  • the access point may generate a pilot sequence of each station by performing an Inverse Discrete Fourier Transform (IDFT) on the sub-sequence corresponding to each station.
  • the pilot sequence of each station may be a pilot sequence composed of discrete pilots in the time domain generated by the IDFT transform of each station.
  • the pilot sequence of the nth station can be respectively shown in the following formula (5).
  • the access point determines a phase offset of each station according to a pilot sequence of each station.
  • the access point In order to eliminate the offset of the frequency of the pilot model of each station in the pilot sequence of each station for the phase deviation of each station, the access point also needs a pilot sequence for each station.
  • the pilot model of each of the stations is conjugate multiplied, and then the phase deviation of each station is determined according to the pilot sequence of the each station after the conjugate multiplication.
  • the access point determines a phase deviation of each station according to the pilot sequence of each of the sites after the conjugate multiplication, and may be adjacent to the pilot sequence of each station by multiplying the conjugate by the conjugate
  • the pilot sequence of the time domain sampling point is conjugate multiplied and obtained by phase; the access point may also be determined by determining a plurality of adjacent time domain time domain sampling points among the plurality of time domain sampling points of each station.
  • the pilot sequences are conjugate multiplied and the phase average of the phases is obtained.
  • the access point conjugates the pilot sequence of each station with the pilot model of each station, which may be a conjugate of the pilot sequence of each station with the pilot model of each station. Make a difference.
  • the access point conjugate multiplies the pilot sequence of the nth station and the pilot model of the nth station, and may be a pilot sequence of the nth station and a pilot model of the nth station.
  • the conjugate is phase-shifted to obtain a pilot sequence for the nth site that cancels the frequency effect of the pilot model. Specifically, it can be expressed by the following formula (6).
  • q n (l) is the pilot sequence of the nth station that eliminates the influence of the frequency of the pilot model.
  • the access point determines the phase deviation of the nth station according to the pilot sequence of the nth station after the conjugate multiplication, that is, the pilot sequence of the nth station affected by the frequency of the pilot model, which may be determined according to Obtained as in the following formula (7).
  • the phase deviation calculation method provided by Embodiment 1 of the present invention may determine a frequency domain sequence of a mixed pilot sequence by using an access point, where the hybrid pilot sequence includes pilot sequences of multiple sites, because the pilot of each station
  • the offset of the frequency of the model to the phase deviation of each of the stations is different from the offset of the frequency of the pilot model of the other stations to the phase deviation of the other stations, so the access station can a pilot model of each of the stations extracts a subsequence corresponding to each of the stations from the sequence of the frequency domain, and then generates a pilot sequence of each of the stations according to the subsequence corresponding to each of the stations, and according to each
  • the pilot sequence of each station determines the phase deviation of each station, so that phase compensation can be performed according to the phase deviation of the transmitting antenna of each station, and the error rate of the received signal caused by the residual deviation is reduced.
  • each time domain sampling point is taken from one symbol period, that is, the sampling interval is one symbol period
  • the L time domain sampling points may be taken from Continuous L symbol periods.
  • the consecutive L symbol periods may be time domain periods corresponding to L orthogonal frequency division multiplexing (OFDM) symbols in time domain.
  • OFDM orthogonal frequency division multiplexing
  • the pilot model of the nth station in the plurality of stations can be as shown in formula (9).
  • the preset pilot p is a constant sequence, such that each item in the preset pilot sequence is an equal constant.
  • the preset pilot can be a sequence of constants of 1, or other constants for each term.
  • ⁇ can be Preset constants, such as ⁇ 1. If the ⁇ is 1, the phase of the pilot model of each station obtained by vector rotation of the frequency of the pilot model of each station may be a forward isometric sequence in turn. If the ⁇ is -1, the phase of the pilot model of each station obtained by vector rotation of the frequency of the pilot model of each station may be a negative isometric sequence in sequence at the L time domain sampling points. .
  • FIG. 3 is a flowchart of a phase deviation calculation method according to Embodiment 2 of the present invention. As shown in FIG. 3, the method of the second embodiment, before the access point determines the frequency domain sequence of the mixed pilot sequence in the foregoing S201, further includes:
  • the access point allocates a pilot model to each of the multiple sites.
  • the access point sends the pilot models allocated to the multiple sites to the multiple sites.
  • the access station may be configured to allocate a pilot model for each of the multiple sites according to the pilot model of each of the sites, and the pilot models of different sites have different frequencies.
  • the access station also transmits a pilot model assigned to the plurality of stations to the plurality of stations such that the plurality of stations can transmit pilot signals according to a pilot model set by the access station assignment.
  • the access station can be better ensured that the phase deviation of each station is more accurate, and the error rate of the received signal caused by the residual deviation is effectively reduced.
  • Embodiment 3 of the present invention further provides a phase deviation calculation method.
  • the method of the third embodiment can be performed by any of the plurality of sites in the wireless local area network.
  • 4 is a flowchart of a phase deviation calculation method according to Embodiment 3 of the present invention. As shown in FIG. 4, the method can include:
  • a station generates a pilot signal according to a pilot model of the station, where a frequency of a pilot model of the station is offset from a phase deviation of the station, different from a frequency of a pilot model of another station to the other station.
  • the offset caused by the phase deviation; the other site is the site outside the site in the WLAN.
  • the station generates a pilot signal according to the pilot model of the station, and may generate a pilot signal of the station at each time domain sampling point according to the pilot model of the station.
  • the station sends the generated pilot signal.
  • the method before the method generates a pilot signal according to the pilot model of the site in S401, the method further includes:
  • the station receives the pilot model of the site assigned by the access point.
  • the method for calculating the phase deviation provided by the third embodiment of the present invention is a scheme executed by the site corresponding to the first embodiment or the second embodiment, and the beneficial effects thereof are similar to those of the foregoing embodiment, and details are not described herein again.
  • Embodiment 4 of the present invention further provides a phase deviation calculation method.
  • the method of the fourth embodiment can be performed by any of the plurality of sites.
  • FIG. 5 is a flowchart of a phase deviation calculation method according to Embodiment 4 of the present invention. As shown in FIG. 5, the method can include:
  • the station determines, according to the pilot model of the station, a pilot signal of the station in consecutive L symbol periods; wherein, the frequency of the pilot model of the station is offset from the phase deviation of the station, different from The frequency of the pilot model of the other site is offset from the phase deviation of the other site; the other site is a site outside the each of the plurality of sites in the wireless local area network; L is an integer power of 2, and L Greater than or equal to 4.
  • the time domain sampling points may be consecutive L symbol periods.
  • the station transmits a pilot signal of the station through a transmit antenna of the station in the consecutive L symbol periods.
  • a pilot signal of the station is transmitted through a transmit antenna of the station on each of the consecutive L symbol periods.
  • the station determines a pilot signal of the station in consecutive L symbol periods according to a pilot model of the station; wherein a frequency of a pilot model of the station is for the station
  • the offset generated by the phase deviation is different from the offset of the frequency of the pilot model of the other station to the phase deviation of the other stations;
  • the other station is a site outside the each of the plurality of stations in the wireless local area network;
  • L is an integer power of 2, and L is greater than or equal to 4, so that the access point can determine the frequency domain sequence according to the mixed pilot sequence formed by the received pilot sequences sent by multiple stations, and determine the frequency domain sequence.
  • the subsequence corresponding to each station generates a pilot sequence of each station according to the subsequence corresponding to each station, and then determines the phase deviation of each station according to the pilot sequence of each station, thereby reducing the received signal caused by residual deviation Bit error rate.
  • the phase deviation calculation method provided in Embodiment 4 of the present invention can make the phase deviation of the transmitting antennas of each station determined by the access point more accurate, and the error rate of the received signal caused by the residual deviation is lower.
  • Embodiment 5 of the present invention also provides a phase deviation calculation method.
  • the method of Embodiment 5 of the present invention can be performed by an access point.
  • FIG. 6 is a flowchart of a phase deviation calculation method according to Embodiment 5 of the present invention. As shown in FIG. 6, the method can include:
  • the access point receives pilot signals of each station sent by the multiple stations through respective transmit antennas in consecutive L symbol periods; wherein, the pilot signal of each station is for each of the stations according to the The pilot signal of each station determines the pilot signal of the each station in the consecutive L symbol periods; the frequency of the pilot model of each station produces an offset of the phase deviation of the station, different from other The frequency of the pilot model of the station is offset from the phase deviation of the other station; the other station is a station outside the each of the plurality of stations in the wireless local area network; L is an integer power of 2, and L is greater than Or equal to 4.
  • the access point determines a mixed pilot sequence according to the pilot signals sent by the multiple stations received in the consecutive L symbol periods.
  • the access point performs time-frequency domain transform on the mixed pilot sequence to determine a phase offset of each station.
  • the mixed pilot sequence is actually a time domain sequence of pilot sequences of the plurality of stations received during the consecutive L symbol periods.
  • the time domain sequence in the consecutive L symbol periods can be transformed into a frequency domain sequence.
  • the time-frequency domain transform can be a Fourier transform, or any other transform that can convert a time domain sequence into a frequency domain sequence.
  • the pilot sequence of the nth station in the lth symbol period is
  • n 1, ..., N;
  • ⁇ n is the frequency of the pilot model of the nth station.
  • the time-frequency domain transform can be a DFT.
  • the number L of symbol periods is an integer power of 2, and then the DFT may be a Fast Fourier Transform (FFT).
  • Figure 7 is the basis A flowchart of a phase deviation calculation method of the fifth embodiment of the invention. As shown in FIG. 7, in the foregoing method, the method S603, the access point performs a time-frequency domain transformation on the mixed pilot sequence, and determines a phase deviation of the transmit antenna of each station, which may include:
  • the access point performs DFT on the mixed pilot sequence to generate a frequency domain sequence of the mixed pilot sequence.
  • the access point filters the frequency domain sequence according to the frequency of the pilot model of each site, and generates a subsequence corresponding to each site.
  • the access point performs IDFT on the subsequence corresponding to each station, and determines a pilot sequence of each station.
  • the access point determines a phase offset of each station according to a pilot sequence of each station.
  • the access point determines the phase deviation of each site according to the pilot sequence of each site, which may include:
  • the access point determines the phase offset of each of the stations based on the phase of the pilot sequence for each of the consecutive L symbol periods.
  • the access point may determine the phase deviation of each station according to the phase of the pilot sequence of each station in any one of the consecutive L symbol periods.
  • the access point may also determine the phase offset of each of the stations based on a plurality of symbol periods, such as an average of the phases of the pilot sequences for each of the consecutive L symbol periods. Wherein, determining the phase deviation of each station according to the average value of the phases of the pilot sequences of each station in the consecutive L symbol periods, so that the phase deviation of each station is more accurate, and the residual deviation is caused by The received signal has a lower bit error rate.
  • the phase deviation calculation method of the fifth embodiment of the present invention can make the phase deviation of each station determined by the access point more accurate, and the error rate of the received signal caused by the residual deviation is lower.
  • Embodiment 6 of the present invention provides a phase deviation calculation method.
  • the method of the sixth embodiment describes any one of the foregoing embodiments 1 to 5 by using a specific example in which the wireless local area network has two stations.
  • FIG. 8 is a flowchart of a phase deviation calculation method according to Embodiment 6 of the present invention. As shown in FIG. 8, the method can include:
  • the access point allocates a pilot model to each of the multiple sites.
  • the frequency of the pilot model of the stations is different from the frequency of the pilot models of the other stations.
  • the access point sends the pilot model of each site to each of the sites.
  • each station generates a pilot sequence of each station in consecutive L symbol periods according to the pilot model of each station; L is an integer power of 2, and L is greater than or equal to 4.
  • the number of stations in the WLAN is 2, two stations in the WLAN, that is, the pilot sequence p 1 of one subcarrier in each symbol period of the first station in the consecutive L symbol periods.
  • the pilot sequence p 2 of one subcarrier in each symbol period of the consecutive L symbol periods and the second station may be as shown in Table 1 below.
  • the each station transmits the pilot sequence of each station through the transmit antenna of each station in the consecutive L symbol periods.
  • the first station will transmit the pilot sequence p 1 of the first station to the access point in the consecutive L symbol periods through the transmit antenna of the first station in the consecutive L symbol periods, and the second station will The pilot sequence p 2 of the second station in the consecutive L symbol periods is transmitted to the access point through the transmit antenna of the second station during the consecutive L symbol periods.
  • the access point determines, according to the pilot sequence of each station sent by the transmitting antenna corresponding to each station in the consecutive L symbol periods, a mixed pilot sequence including a pilot sequence of the multiple stations. .
  • the access point performs DFT on the mixed pilot sequence to generate a frequency domain sequence.
  • the mixed pilot sequence received by the receiving antenna of the access point on the pilot subcarrier m in the first symbol period may be r m (1). If noise is ignored, the r m (l) can be expressed by the following formula (10).
  • h m1 is channel information of the receiving antenna of the transmitting antenna of the first station in the WLAN on the pilot subcarrier m to the receiving point of the access point.
  • h m2 is channel information of the transmitting antenna of the second station in the wireless local area network on the pilot subcarrier m to the receiving antenna of the access point.
  • p 1 (l) is the pilot model of the first station in the lth symbol period
  • p 2 (l) is the pilot model of the second station in the lth symbol period
  • ⁇ 1 and ⁇ 2 may be phase deviations of the transmitting antennas of the first station and the second station to the receiving antennas of the access point, respectively.
  • the access point performs DFT on the mixed pilot sequence, and actually performs DFT on r m1 (l) and r m2 (l) therein.
  • the frequency domain sequence is The It can be as shown in the following formula (11).
  • the subsequence corresponding to the first station that is, the unit sequence signal width of the pilot sequence of the first station in the transform domain, that is, the frequency domain, is the guide of the first station.
  • the subsequence corresponding to the second station may be as shown in formula (13).
  • the access point filters the frequency domain sequence according to the frequency of the pilot model of each site, and generates a subsequence corresponding to each site.
  • the access point may be the frequency domain sequence according to the frequency ⁇ 2 of the pilot model of the second station. Filtering to filter out The subsequence corresponding to the second station obtains the subsequence corresponding to the first station, so that the subsequence corresponding to the first station is as shown in formula (14).
  • the subsequence corresponding to the first site is the subsequence corresponding to the first site.
  • the access point may be the frequency domain sequence according to the frequency ⁇ 1 of the pilot model of the first station. Filtering to filter out The subsequence corresponding to the first station obtains a subsequence corresponding to the second station, and the subsequence corresponding to the second station may be as in formula (15).
  • the subsequence corresponding to the second site is the subsequence corresponding to the second site.
  • the access point performs IDFT on the subsequence corresponding to each station, and generates a pilot sequence of each station, where the pilot sequence of each station includes a guide of each station in consecutive L symbol periods. Frequency sequence.
  • the access point may perform IDFT on the sub-sequence corresponding to the first station and the sub-sequence corresponding to the second station, and obtain the sub-sequence corresponding to the first station and the second station in the consecutive L symbol periods. Subsequence.
  • the subsequence corresponding to the first station and the subsequence corresponding to the second station may be respectively shown in formula (16) and formula (17).
  • the access point determines a phase deviation of each station according to an average value of phases of the pilot sequences of each station in the consecutive L symbol periods.
  • the average of the phases of the pilot sequences of the first station in the consecutive L symbol periods can be as shown in equation (18).
  • Equation (18) If noise and interference are not considered, in equation (18), q 1 (l+1)*conj(q 1 (l)) can be as shown in equation (20).
  • the average value of the phases of the pilot sequences of the second station in the consecutive L symbol periods can be as shown in the formula (21).
  • the access point may be based on determining a phase deviation of the first station according to the formula (18), and determining a phase deviation of the second station according to the formula (23).
  • Embodiment 7 of the present invention provides an access point.
  • FIG. 9 is a schematic structural diagram of an access point according to Embodiment 7 of the present invention.
  • the access point of the seventh embodiment can perform the phase deviation calculation method of any one of the first embodiment, the second embodiment or the fifth embodiment.
  • the access point 900 can include a determining module 901, an extracting module 902, and a generating module 903.
  • the determining module 901 is configured to determine a frequency domain sequence of the mixed pilot sequence, where the mixed pilot sequence includes a pilot sequence of multiple sites.
  • the extracting module 902 is configured to extract, according to a pilot model of each of the multiple sites, the subsequence corresponding to each site from the frequency domain sequence; wherein, the frequency of the pilot model of each site is The offset generated by the phase deviation of the stations is different from the offset of the frequency of the pilot model of other stations to the phase deviation of the other stations; the other stations are outside the each of the multiple sites in the WLAN Site.
  • the generating module 903 is configured to generate a pilot sequence of each site according to the sub-sequence corresponding to each site.
  • the determining module 901 is further configured to determine a phase deviation of each station according to the pilot sequence of each station.
  • the access point 900 further includes:
  • an allocating module configured to allocate a pilot model to each of the plurality of stations before the determining module 901 determines the frequency domain sequence of the mixed pilot sequence.
  • a sending module configured to separately send a pilot model allocated for the multiple sites to the multiple sites.
  • the access point of the seventh embodiment of the present invention can perform the phase deviation calculation method of any one of the foregoing embodiments, the second embodiment, or the fifth embodiment, and the beneficial effects are similar to those of the foregoing embodiment, and details are not described herein again.
  • Embodiment 8 of the present invention also provides a site.
  • FIG. 10 is a schematic structural diagram of a station according to Embodiment 8 of the present invention.
  • the station of the eighth embodiment can perform the calculation method of the phase deviation provided by the third embodiment or the fourth embodiment.
  • the site 1000 can include: a generating module 1001 and a sending module 1002.
  • a generating module 1001 configured to generate a pilot signal according to a pilot model of the station, where a frequency of a pilot model of the station is offset from a phase deviation of the station, different from a frequency pair of pilot models of other stations The offset caused by the phase deviation of the other site; the other site is a site outside the site in the WLAN.
  • the sending module 1002 is configured to send the generated pilot signal.
  • the site 1000 further includes:
  • the receiving module is configured to receive, before the generating module 1001 generates a pilot signal according to the pilot model of the station, a pilot model of the station allocated by the access point.
  • the station of the eighth embodiment of the present invention can perform the calculation method of the phase deviation provided by the third embodiment or the fourth embodiment, and the beneficial effects are similar to those of the foregoing embodiment, and details are not described herein again.
  • Embodiment 9 of the present invention provides an access point.
  • the access point of the ninth embodiment of the present invention can perform the phase deviation calculation method of the first embodiment, the second embodiment or the fifth embodiment.
  • FIG. 11 is a schematic structural diagram of an access point according to Embodiment 9 of the present invention.
  • the access point 1100 includes: a receiver. 1101, a processor 1102 and a transmitter 1103.
  • the processor 1102 is configured to determine a frequency domain sequence of the mixed pilot sequence, and extract a subsequence corresponding to each site from the frequency domain sequence according to a pilot model of each of the multiple sites, according to the The subsequence corresponding to each station generates a pilot sequence of each station, and the phase deviation of each station is determined according to the pilot sequence of each station.
  • the hybrid pilot sequence includes a pilot sequence of a plurality of stations; the frequency of the pilot model of each station generates an offset of the phase deviation of each station, and is different from the frequency of the pilot model of other stations.
  • An offset from the phase offset of the other site; the other site is a site outside of each of the plurality of sites in the wireless local area network.
  • the processor 1102 is further configured to allocate a pilot model to each of the multiple sites before the processor 1102 determines the frequency domain sequence of the mixed pilot sequence.
  • the transmitter 1103 is configured to separately send pilot models of the multiple sites to the multiple sites.
  • the access point of the ninth embodiment of the present invention can be used in the phase deviation calculation method of any one of the first embodiment, the second embodiment, or the fifth embodiment, and the beneficial effects are similar to those of the foregoing embodiment, and details are not described herein again.
  • Embodiment 10 of the present invention also provides a site.
  • FIG. 12 is a schematic structural diagram of a station according to Embodiment 10 of the present invention.
  • the station of the tenth embodiment can perform the calculation method of the phase deviation provided in the third embodiment or the fourth embodiment.
  • the site 1200 can include a receiver 1201, a processor 1202, and a transmitter 1203.
  • the processor 1202 is configured to generate a pilot signal according to a pilot model of the station, where a frequency of a pilot model of the station is offset from a phase deviation of the station, different from a pilot model of another station.
  • the offset of the frequency from the phase offset of the other site; the other site is the site outside the site in the WLAN.
  • the transmitter 1203 is configured to send the generated pilot signal.
  • the receiver 1201 is configured to generate, according to the pilot model of the station, by the processor 1202. Before the pilot signal, the pilot model of the station allocated by the access point is received.
  • the station of the tenth embodiment of the present invention can perform the calculation method of the phase deviation provided by the third embodiment or the fourth embodiment, and the beneficial effects are similar to those of the foregoing embodiment, and details are not described herein again.
  • the foregoing program may be stored in a computer readable storage medium, and the program is executed when executed.
  • the foregoing steps include the steps of the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

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Abstract

本发明实施例提供一种相位偏差计算方法、接入点及站点。本发明的相位偏差计算方法包括确定混合导频序列的频域序列，混合导频序列包括多个站点的导频序列；根据站点的导频模型提取站点的子序列，根据站点的子序列生成的站点的导频序列确定站点的相位偏差。本发明实施例降低残留偏差造成的接收信号的误码率。

Description

相位偏差计算方法、接入点及站点 技术领域
本发明实施例涉及通信技术，尤其涉及一种相位偏差计算方法、接入点及站点。
背景技术
无线保真(Wireless-Fidelity，简称WiFi)技术作为无线局域网(Wireless Local Area Networks，简称WLAN)***的主要技术标准，电气和电子工程师协会(Institute of Electrical and Electronics Engineers，简称IEEE)制定的技术标准802.11，在历经802.11a，802.11b，802.11d，802.11n和802.11ac等各个版本，技术发展已越来越成熟，传输速度也越来越高。另一方面，由于WiFi技术特有的灵活性，使其在家用和商用环境中得到了越来越多的应用。在基于WiFi技术的WLAN网络中，接收机对接收信号进行基带处理流程，主要包括：符号同步、信道估计及数据预处理等。其中，该符号同步指的是根据接收到的短训练序列(Short Training Field，简称STF)及接收信号进行符号同步，实现发射机和接收机之间的频率同步和时间同步。该信道估计，实际是利用接收到的长训练序列(Long Training Field，简称LTF)进行信道估计获得信道信息。该数据预处理实际指的是根据信道估计所获得的信道信息对信号进行信道均衡以消除信道的影响。
虽然接收机可根据STF实现发射机与该接收机之间的频率同步，但不可能实现完全的频率同步，因而存在一定的残留频偏。
然而，该残留频偏的存在会导致接收机接收的信号存在相位偏差。该残留频偏导致的相位偏差会使得接收信号的误码率较高，甚至无法解调。
发明内容
本发明实施例提供一种相位偏差计算方法、接入点及站点，以解决残留频偏导致的相位偏差造成的接收信号的误码率高的问题。
第一方面，本发明实施例提供一种相位偏差计算方法，包括：
接入点确定混合导频序列的频域序列，其中所述混合导频序列包括多个站点的导频序列；
所述接入点根据所述多个站点中每个站点的导频模型从所述频域序列中提取所述每个站点对应的子序列；其中，所述每个站点的导频模型的频率对所述每个站点的相位偏差产生的偏移，不同于，其他站点的导频模型的频率对所述其他站点的相位偏差产生的偏移；所述其他站点为无线局域网中所述多个站点中所述每个站点外的站点；
所述接入点根据所述每个站点对应的子序列生成所述每个站点的导频序列；
所述接入点根据所述每个站点的导频序列确定所述每个站点的相位偏差。
根据第一方面，在第一方面的第一种可能实现的方式中，所述每个站点的导频模型为
Figure PCTCN2015073684-appb-000001
l＝0,1,…,L-1，其中，p为预设导频，δ为预设常数，Δ为所述每个站点的导频模型的频率，L为时域采样长度。
根据第一方面或第一方面的第一种可能实现的方式，在第二种可能实现的方式中，所述接入点确定混合导频序列的频域序列之前，所述方法还包括：
所述接入点为所述多个站点中各站点分别分配一个导频模型；
所述接入点将为所述多个站点分配的导频模型分别发送至所述多个站点。
第二方面，本发明实施例提供一种相位偏差计算方法，包括：
站点根据所述站点的导频模型生成导频信号，其中，所述站点的导频模型的频率对所述站点的相位偏差产生的偏移，不同于其他站点的导频模型的频率对所述其他站点的相位偏差产生的偏移；所述其他站点为无线局域网中所述站点外的站点；
所述站点发送生成的导频信号。
根据第二方面，在第二方面的第一种可能实现的方式中，所述站点的导频模型为
Figure PCTCN2015073684-appb-000002
l＝0,1,…,L-1，其中，p为预设导频，δ为预设常数；Δ为所述站点的导频模型的频率，L为时域采样长度。
根据第二方面或第二方面的第一种可能实现的方式，在第二种可能实现的方式中，所述站点根据所述站点的导频模型生成导频信号之前，所述方法 还包括：
所述站点接收接入点分配的所述站点的导频模型。
第三方面，本发明实施例提供一种接入点，包括：
确定模块，用于确定混合导频序列的频域序列，其中所述混合导频序列包括多个站点的导频序列；
提取模块，用于根据所述多个站点中每个站点的导频模型从所述频域序列中提取所述每个站点对应的子序列；其中，所述每个站点的导频模型的频率对所述每个站点的相位偏差产生的偏移，不同于，其他站点的导频模型的频率对所述其他站点的相位偏差产生的偏移；所述其他站点为无线局域网中所述多个站点中所述每个站点外的站点；
生成模块，用于根据所述每个站点对应的子序列生成所述每个站点的导频序列；
所述确定模块，还用于根据所述每个站点的导频序列确定所述每个站点的相位偏差。
根据第三方面，在第三方面的第一种可能实现的方式中，所述每个站点的导频模型为
Figure PCTCN2015073684-appb-000003
l＝0,1,…,L-1，其中，p为预设导频，δ为预设常数，Δ为所述每个站点的导频模型的频率，L为时域采样长度。
根据第三方面或第三方面的第一种可能实现的方式，在第二种可能实现的方式中，所述接入点还包括：
分配模块，用于在所述确定模块确定所述混合导频序列的所述频域序列之前，为所述多个站点中各站点分别分配一个导频模型；
发送模块，用于将为所述多个站点分配的导频模型分别发送至所述多个站点。
第四方面，本发明实施例提供一种站点，包括：
生成模块，用于根据所述站点的导频模型生成导频信号，其中，所述站点的导频模型的频率对所述站点的相位偏差产生的偏移，不同于其他站点的导频模型的频率对所述其他站点的相位偏差产生的偏移；所述其他站点为无线局域网中所述站点外的站点；
发送模块，用于发送生成的导频信号。
根据第四方面，在第四方面的第一种可能实现的方式中，所述站点的导 频模型为
Figure PCTCN2015073684-appb-000004
l＝0,1,…,L-1，其中，p为预设导频，δ为预设常数；Δ为所述站点的导频模型的频率，L为时域采样长度。
根据第四方面或第四方面的第一种可能实现的方式，在第二种可能实现的方式中，所述站点还包括：
接收模块，用于在所述生成模块根据所述站点的导频模型生成导频信号之前，接收接入点分配的所述站点的导频模型。
第五方面，本发明实施例提供一种接入点，包括：接收机、处理器及发射机；
其中，所述处理器，用于确定混合导频序列的频域序列，根据所述多个站点中每个站点的导频模型从所述频域序列中提取所述每个站点对应的子序列，根据所述每个站点对应的子序列生成所述每个站点的导频序列，根据所述每个站点的导频序列确定所述每个站点的相位偏差；
其中，所述混合导频序列包括多个站点的导频序列；所述每个站点的导频模型的频率对所述每个站点的相位偏差产生的偏移，不同于，其他站点的导频模型的频率对所述其他站点的相位偏差产生的偏移；所述其他站点为无线局域网中所述多个站点中所述每个站点外的站点。
根据第五方面，在第五方面的第一种可能实现的方式中，所述每个站点的导频模型为
Figure PCTCN2015073684-appb-000005
l＝0,1,…,L-1，其中，p为预设导频，δ为预设常数，Δ为所述每个站点的导频模型的频率，L为时域采样长度。
根据第五方面或第五方面的第一种可能实现的方式，在第二种可能实现的方式，所述处理器，还用于在所述处理器确定所述混合导频序列的所述频域序列之前，为所述多个站点中各站点分别分配一个导频模型；
所述发射机，用于将所述多个站点的导频模型分别发送至所述多个站点。
第六方面，本发明实施例提供一种站点，包括：接收机、处理器及发射机；
其中，所述处理器，用于根据所述站点的导频模型生成导频信号，其中，所述站点的导频模型的频率对所述站点的相位偏差产生的偏移，不同于其他站点的导频模型的频率对所述其他站点的相位偏差产生的偏移；所述其他站点为无线局域网中所述站点外的站点；
所述发射机，用于发送生成的导频信号。
根据第六方面，在第六方面的第一种可能实现的方式中，所述站点的导频模型为
Figure PCTCN2015073684-appb-000006
l＝0,1,…,L-1，其中，p为预设导频，δ为预设常数；Δ为所述站点的导频模型的频率，L为时域采样长度。
根据第六方面或第六方面的第一种可能实现的方式，在第二种可能实现的方式，所述接收机，用于在所述处理器根据所述站点的导频模型生成导频信号之前，接收接入点分配的所述站点的导频模型。
本发明实施例提供相位偏差计算方法、接入点及站点，可通过接入点确定混合导频序列的频域序列，其中该混合导频序列包括多个站点的导频序列，由于该每个站点的导频模型的频率对该每个站点的相位偏差产生的偏移，不同于，其他站点的导频模型的频率对该其他站点的相位偏差产生的偏移，因此该接入站可根据该多个站点中每个站点的导频模型从该频域序列中提取该每个站点对应的子序列，继而根据该每个站点对应的子序列生成该每个站点的导频序列，并根据该每个站点的导频序列确定该每个站点的相位偏差，从而可根据各站点发射天线的相位偏差进行相位补偿，降低残留偏差造成的接收信号的误码率。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作一简单地介绍，显而易见地，下面描述中的附图是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1为本发明各实施例的相位偏差计算方法的适用场景示意图；
图2为本发明实施例一的相位偏差计算方法的流程图；
图3为本发明实施例二的相位偏差计算方法的流程图；
图4为本发明实施例三的相位偏差计算方法的流程图；
图5为本发明实施例四的相位偏差计算方法的流程图；
图6为本发明实施例五的相位偏差计算方法的流程图；
图7为本发明实施例五的相位偏差计算方法的流程图；
图8为本发明实施例六的相位偏差计算方法的流程图；
图9为本发明实施例七的接入点的结构示意图；
图10为本发明实施例八的站点的结构示意图；
图11为本发明实施例九的接入点的结构示意图；
图12为本发明实施例十的站点的结构示意图。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
本实施例的方案可适用于802.11版本及其以上各版本的WiFi技术和MIMO技术的WLAN网络***。图1为本发明各实施例的相位偏差计算方法的适用场景示意图。如图1所示，该WLAN网络***中可包括一个接入点101和至少两个站点102。接入点101包括至少两个接收天线，每个站点可分别包括至少一个发射天线。该实施例方案适用于，该接入点通过至少两个接收天线接收该至少两个站点通过各自天线传输空间流的场景。其中，每个发射天线可发射一个空间流。
站点(Station，简称STA)，还可以称为用户设备，可以是无线传感器、无线通信终端或移动终端，如支持WiFi通讯功能的移动电话(或称为“蜂窝”电话)和具有无线通信功能的计算机。例如，可以是支持WiFi通讯功能的便携式、袖珍式、手持式、计算机内置的，可穿戴的，或者车载的无线通信装置，它们与无线接入网交换语音、数据等通信数据。接入点(Access Point，简称AP)，也可称之为无线访问接入点或桥接器或热点等，其可以接入服务器或通信网络。本领域技术人员知道，一些通信设备可能同时具有上述接入点或者站点的功能，在此不予限制。
本发明实施例一提供一种相位偏差计算方法。图2为本发明实施例一的相位偏差计算方法的流程图。该方法由接入点执行。如图2所示，本发明实施例一提供的方法可包括：
S201、接入点确定混合导频序列的频域序列，其中该混合导频序列包括多个站点的导频序列。
该混合导频序列可以为该接入点接收到的该无线局域网中该多个站点发送的导频序列的时域混合信号的时域采样序列。该接入点确定该混合导频序列的频域序列，可以为通过对该混合导频序列进行离散傅里叶变换(Discrete Fourier Transform，简称DFT)获得的时域采样点对应的频域序列。
举例来说，若该无线局域网中的站点个数为n，n为大于或等于2的整数。该混合导频序列可以为该n个站点的导频序列在时域上组成的混合序列。如忽略噪声，在接入点一侧第m个导频子载波上的混合导频序列的第l个时域采样点可以为rm(l)。该rm(l)可以如下公式(1)所示。
Figure PCTCN2015073684-appb-000007
……公式(1)
其中，rmn(l)为第l个时域采样点中第n站点对应的时域采样点。hmn为无线局域网中第n站点的发射天线在导频子载波m上至该接入点的接收天线的信道信息。pn(l)为第n站点的导频模型的第l个时域采样点。θn可为该第n站点的相位偏差。其中，该第n站点的相位偏差为该第n站点的发射天线至该接入点的接收天线的相位偏差。
若该混合导频序列的时域采样长度为L，也就是L个时域采样点，则l＝0,1,…,L-1。例如，L为2的整数次方，且该L大于或等于4。那么对该混合导频序列进行DFT变换获得的该频域序列
Figure PCTCN2015073684-appb-000008
则可以如下公式(2)所示。
Figure PCTCN2015073684-appb-000009
......公式(2)
其中，
Figure PCTCN2015073684-appb-000010
为该频域序列中该第n站点对应子序列。
S202、该接入点根据该多个站点中每个站点的导频模型从该频域序列中提取该每个站点对应的子序列；其中，该每个站点的导频模型的频率对该每个站点的相位偏差产生的偏移，不同于，其他站点的导频模型的频率对该其他站点的相位偏差产生的偏移；该其他站点为无线局域网中该多个站点中该每个站点外的其他点。
具体来说，该每个站点的导频模型的频率对该每个站点的相位偏差产生的偏移，实际可以为该每个站点的导频模型的频率。该其他站点的导频模型 的频率对该其他站点的相位偏差产生的偏移，可以为该其他站点的导频模型的频率。那么，该每个站点的导频模型的频率对该每个站点的相位偏差产生的偏移，不同于，其他站点的导频模型的频率对该其他站点的相位偏差产生的偏移，是说，该每个站点的导频模型的频率不同于该其他站点的导频模型的频率。
该多个站点的导频模型的频率构成等差序列，例如第n个站点的导频模型的频率为nΔ，其中Δ为预设偏差值。当然，所述多个站点的导频序列也可不构成等差序列，仅仅要求每个站点的导频模型的频率对该每个站点的相位偏差产生的偏移，不同于，其他站点的导频模型的频率对该其他站点的相位偏差产生的偏移即可。在这种情况下，提取每个站点的子序列时，需要使用多个站点的导频模型的频率中的至少一些频率以及一预设偏差值。
由于该不同站点的相位偏差不同，且该不同站点的导频模型的频率对各自站点的相位偏差产生的偏移也不同，那么该频域序列中该不同站点对应子序列，则分别为不同频点的子序列。因此，该接入点根据该多个站点中该每个站点的导频模型从该频域序列中提取该每个站点对应的子序列可以为根据该每个站点的导频模型的频率，对该频域序列进行滤波从而获得该每个站点对应的子序列。
举例来说，若该无线局域网中第n站点的导频模型的频率对该第n站点的相位偏差产生的偏移为Δn(即第n站点的导频模型的频率为Δn)，第n-1站点的导频模型的频率对该第n-1站点的相位偏差产生的偏移为Δn-1(即第n-1站点的导频模型的频率为Δn-1)。其中，Δn≠Δn-1。若该Δn>Δn-1，该频域序列中该第n站点对应的子序列可以如式(3)所示。
Figure PCTCN2015073684-appb-000011
……公式(3)
该接入点根据该第n站点的导频模型从该频域序列中提取该第n站点对应的子序列，可以是根据该第n站点的导频模型的频率将该频域序列中其他频点的序列进行滤除，以获取该第n站点对应的子序列。具体可以是根据如下公式(4)进行滤波获得。
Figure PCTCN2015073684-appb-000012
……公式(4)
其中，该
Figure PCTCN2015073684-appb-000013
为该频域序列中该第n站点对应的子序列。
S203、该接入点根据该每个站点对应的子序列生成该每个站点的导频序列。
该接入点可以是通过对该每个站点对应的子序列进行离散傅里叶逆变换(Inverse Discrete Fourier Transform，简称IDFT)生成该每个站点的导频序列。该每个站点的导频序列可以为该每个站点经IDFT变换后生成的时域上的离散导频组成的导频序列。
该第n站点的导频序列可分别如下公式(5)所示。
Figure PCTCN2015073684-appb-000014
……公式(5)
其中，
Figure PCTCN2015073684-appb-000015
为该第n站点的导频序列。
S204、该接入点根据该每个站点的导频序列确定该每个站点的相位偏差。
为消除该每个站点的导频序列中，该每个站点的导频模型的频率对该每个站点的相位偏差产生的偏移，该接入点还需对该每个站点的导频序列和该每个站点的导频模型进行共轭相乘，继而根据该共轭相乘后该每个站点的导频序列确定该每个站点的相位偏差。该接入点根据该共轭相乘后该每个站点的导频序列确定该每个站点的相位偏差，可以是通过对该共轭相乘后该每个站点的导频序列中，相邻时域采样点的导频序列进行共轭相乘并求相位获得；该接入点还可以是通过确定该每个站点的多个时域采样点中，多个相邻时域时域采样点的导频序列共轭相乘并求相位的相位平均值获得。该接入点对该每个站点的导频序列和该每个站点的导频模型进行共轭相差，可以是将该每个站点的导频序列与该每个站点的导频模型的共轭进行相差。
其中，该接入点对该第n站点的导频序列和该第n站点的导频模型进行共轭相乘，可以是将该第n站点的导频序列与该第n站点的导频模型的共轭进行相差，以获得消除导频模型的频率影响的该第n站点的导频序列。具体可如下公式(6)所示。
Figure PCTCN2015073684-appb-000016
……公式(6)
其中，qn(l)为消除导频模型的频率影响的第n站点的导频序列。
该接入点根据该共轭相乘后该第n站点的导频序列，也就是消除导频模型的频率影响的第n站点的导频序列，确定该第n站点的相位偏差，可以是根据如下公式(7)获得。
Figure PCTCN2015073684-appb-000017
……公式(7)
若忽略噪声和干扰，上述公式(7)中的qn(l+1)*conj(qn(l))可如下公式(8)所示。
Figure PCTCN2015073684-appb-000018
……公式(8)
本发明实施例一提供的相位偏差计算方法，可通过接入点确定混合导频序列的频域序列，其中该混合导频序列包括多个站点的导频序列，由于该每个站点的导频模型的频率对所述每个站点的相位偏差产生的偏移，不同于，其他站点的导频模型的频率对所述其他站点的相位偏差产生的偏移，因此该接入站可根据该多个站点中每个站点的导频模型从该频域序列中提取该每个站点对应的子序列，继而根据该每个站点对应的子序列生成该每个站点的导频序列，并根据该每个站点的导频序列确定该每个站点的相位偏差，从而可根据各站点发射天线的相位偏差进行相位补偿，降低残留偏差造成的接收信号的误码率。
需要说明的是，该混合导频序列的L个时域采样点中，每个时域采样点取自一个符号周期，即采样间隔为一个符号周期，那么该L个时域采样点可以取自连续的L个符号周期。该连续的L个符号周期可以为时域连续的L个正交频分复用(Orthogonal Frequency Division Multiplexing，简称OFDM)符号对应的时域周期。本领域的技术人员明白，采样间隔也可以根据具体需要进行设置。
可选的，该每个站点的导频模型可为
Figure PCTCN2015073684-appb-000019
l＝0,1,…,L-1，其中，p为预设导频，δ为预设常数，Δ为该每个站点的导频模型的频率，其中，L为时域采样长度。
那么，该多个站点中第n站点的导频模型可如公式(9)所示。
Figure PCTCN2015073684-appb-000020
……公式(9)
其中，该预设导频p为常数序列，如该预设导频序列中每项均为相等的常数。该预设导频可以为每项为常数1，或其他常数所组成的序列。δ可为 预设常数，如±1。若该δ为1，通过对该每个站点的导频模型的频率进行向量旋转得到的该每个站点的导频模型在L个时域采样点上的相位可依次为正向等差序列。若该δ为-1，通过对该每个站点的导频模型的频率进行向量旋转得到的该每个站点的导频模型在L个时域采样点上的相位可依次为负向等差序列。
图3为本发明实施例二的相位偏差计算方法的流程图。如图3所示，该实施例二的方法，在上述S201中接入点确定混合导频序列的频域序列之前，还包括：
S301、该接入点为该多个站点中各站点分别分配一个导频模型。
S302、该接入点将为该多个站点分配的导频模型分别发送至该多个站点。
该接入站可以是根据上述每个站点的导频模型，为该多个站点中各站点分别分配一个导频模型，且不同站点的导频模型的频率不同。该接入站还将为该多个站点分配的导频模型发送至该多个站点，从而使得该多个站点可根据该接入站分配设置的导频模型进行导频信号的发送。
本发明实施例二，在上述实施例一的基础上，可更好地保证该接入站确定该每个站点的相位偏差更准确，有效降低残留偏差造成的接收信号的误码率。
本发明实施例三还提供一种相位偏差计算方法。该实施例三的方法可由该无线局域网中该多个站点中任一站点执行。图4为本发明实施例三的相位偏差计算方法的流程图。如图4所示，该方法可包括：
S401、站点根据该站点的导频模型生成导频信号，其中，该站点的导频模型的频率对该站点的相位偏差产生的偏移，不同于其他站点的导频模型的频率对该其他站点的相位偏差产生的偏移；该其他站点为无线局域网中该站点外的站点。
该站点根据该站点的导频模型生成导频信号，可以是根据该站点的导频模型生成该站点在各时域采样点的导频信号。
S402、该站点发送生成的导频信号。
可选的，该站点的导频模型为
Figure PCTCN2015073684-appb-000021
l＝0,1,…,L-1，其中，p为预设导频，δ为预设常数；Δ为该站点的导频模型的频率；L为时域采样长度。
可选的，该方法在S401中站点根据该站点的导频模型生成导频信号之前，该方法还包括：
该站点接收接入点分配的该站点的导频模型。
本发明实施例三提供的相位偏差计算方法，为与上述实施例一或实施例二对应的站点所执行的方案，其有益效果与上述实施例类似，在此不再赘述。
本发明实施例四还提供一种相位偏差计算方法。该实施例四的方法可由该多个站点中任一站点执行。图5为本发明实施例四的相位偏差计算方法的流程图。如图5所示，该方法可包括：
S501、该站点根据该站点的导频模型确定该站点在连续L个符号周期内的导频信号；其中，该站点的导频模型的频率对该站点的相位偏差产生的偏移，不同于，其他站点的导频模型的频率对该其他站点的相位偏差产生的偏移；该其他站点为无线局域网中该多个站点中该每个站点外的站点；L为2的整数次方，且L大于或等于4。
在本实施例四中，时域采样点可以是连续的L个符号周期。
S502、该站点在该连续L个符号周期内通过该站点的发射天线发送该站点的导频信号。
在该连续L个符号周期内的每个子载波上均通过该站点的发射天线发送该站点的导频信号。
本发明实施例四提供的相位偏差计算方法，该站点根据该站点的导频模型确定该站点在连续L个符号周期内的导频信号；其中，该站点的导频模型的频率对该站点的相位偏差产生的偏移，不同于，其他站点的导频模型的频率对该其他站点的相位偏差产生的偏移；该其他站点为无线局域网中该多个站点中该每个站点外的站点；L为2的整数次方，且L大于或等于4，因此可使得接入点根据接收到的多个站点发送的导频序列构成的混合导频序列确定频域序列，并确定该频域序列中各站点对应的子序列，根据该各站点对应的子序列生成该各站点的导频序列，继而根据各站点的导频序列确定各站点的相位偏差，因而可降低残留偏差造成的接收信号的误码率。
可选的，本发明实施例四的方法中，该站点的导频模型为
Figure PCTCN2015073684-appb-000022
l＝0,1,…,L-1，其中，p为预设导频，δ为预设常数，Δ为该站点的导频模型 的频率。
那么，根据第n站点可根据该第n站点的导频模型确定该第n站点在第l个符号周期，即第l个时域采样点内的导频序列，如
Figure PCTCN2015073684-appb-000023
其中，n＝1,…,N；Δn为该第n站点的导频模型的频率。δ为可以为±1。
本发明实施例四提供的相位偏差计算方法，可使得接入点确定的各站点的发射天线的相位偏差更准确，残留偏差造成的接收信号的误码率更低。
本发明实施例五还提供一种相位偏差计算方法。本发明实施例五的方法可由接入点执行。图6为本发明实施例五的相位偏差计算方法的流程图。如图6所示，该方法可包括：
S601、接入点在连续L个符号周期内接收该多个站点通过各自的发射天线发送的每个站点的导频信号；其中，该每个站点的导频信号为该每个站点根据该每个站点的导频模型确定的该每个站点在该连续L个符号周期内的导频信号；该每个站点的导频模型的频率对该站点的相位偏差产生的偏移，不同于，其他站点的导频模型的频率对该其他站点的相位偏差产生的偏移；该其他站点为无线局域网中该多个站点中该每个站点外的站点；L为2的整数次方，且L大于或等于4。
S602、该接入点根据该连续L个符号周期内接收到的该多个站点发送的导频信号，确定混合导频序列。
S603、该接入点对该混合导频序列进行时频域变换，确定该每个站点的相位偏差。
该混合导频序列，实际为在该连续L个符号周期内接收到的该多个站点的导频序列的时域序列。对该混合导频序列进行时频域变换，可以将该连续L个符号周期内的时域序列，变换为频域序列。该时频域变换可以傅里叶变换，或其他任一可将时域序列转换为频域序列的变换。
可选的，本实施例五的方法在上述实施例四的方法的基础上，该每个站点的导频模型为
Figure PCTCN2015073684-appb-000024
l＝0,1,…,L-1，其中，p为预设导频，δ为预设常数，Δ为该每个站点的导频模型的频率。δ为可以为±1。
那么该第n站点在第l个符号周期内，即第l个时域采样点的导频序列为
Figure PCTCN2015073684-appb-000025
其中，n＝1,…,N；Δn为该第n个站点的导频模型的频率。
该时频域变换可以为DFT。符号周期的个数L为2的整数次方，那么该DFT可以为快速傅里叶变换(Fast Fourier Transform，简称FFT)。图7为本 发明实施例五的相位偏差计算方法的流程图。如图7所示，上述实施例五方法S603该接入点对该接入点对该混合导频序列进行时频域变换，确定该每个站点的发射天线的相位偏差，可以包括：
S701、该接入点对该该混合导频序列进行DFT，生成该混合导频序列的频域序列。
S702、该接入点根据该每个站点的导频模型的频率，对该频域序列进行滤波，生成该每个站点对应的子序列。
S703、该接入点对该每个站点对应的子序列进行IDFT，确定该每个站点的导频序列。
S704、该接入点根据该每个站点的导频序列确定该每个站点的相位偏差。
可选的，S704中该接入点根据该每个站点的导频序列确定该每个站点的相位偏差，可包括：
该接入点根据该连续L个符号周期内该每个站点的导频序列的相位，确定该每个站点的相位偏差。
具体地，该接入点可以是根据该连续L个符号周期中任一符号周期内该每个站点的导频序列的相位，确定该每个站点的相位偏差。该接入点还可以是根据多个符号周期如该连续L个符号周期内该每个站点的导频序列的相位的平均值，确定该每个站点的相位偏差。其中，根据该连续L个符号周期内该每个站点的导频序列的相位的平均值，确定该每个站点的相位偏差，可使得该每个站点的相位偏差更准确，那么残留偏差造成的接收信号的误码率更低。
本发明实施例五的相位偏差计算方法，可使得接入点确定的各站点的相位偏差更准确，残留偏差造成的接收信号的误码率更低。
实施例六
本发明实施例六提供一种相位偏差计算方法。该实施例六的方法通过无线局域网具有2个站点的具体实例对上述实施例一至实施例五中任一方法进行说明。图8为本发明实施例六的相位偏差计算方法的流程图。如图8所示，该方法可包括：
S801、接入点为该多个站点中每个站点分配一个导频模型。
该每个站点的导频模型可为
Figure PCTCN2015073684-appb-000026
l＝0,1,…,L-1，其中，p为预设导频，δ为±1，Δ为该每个站点的导频模型的频率，其中，L为时域采样长度；该每个站点的导频模型的频率不同于该其他站点的导频模型的频率。
S802、该接入点将该每个站点的导频模型发送至该每个站点。
S803、该每个站点根据该每个站点的导频模型生成该每个站点在连续L个符号周期内的导频序列；L为2的整数次方，且L大于或等于4。
举例来说，若该无线局域网中站点个数为2，该无线局域网中的两个站点，即第一站点在该连续L个符号周期中各符号周期内的一个子载波的导频序列p1和第二站点在该连续L个符号周期中各符号周期内的一个子载波的导频序列p2可分别如下表1所示。
Figure PCTCN2015073684-appb-000027
表1
S804、该每个站点在该连续L个符号周期内通过该每个站点的发射天线发送该每个站点的导频序列。
该第一站点将在该连续L个符号周期内通过该第一站点的发射天线将该连续L个符号周期内该第一站点的导频序列p1发送至接入点，该第二站点将在该连续L个符号周期内通过该第二站点的发射天线将该连续L个符号周期内该第二站点的导频序列p2发送至接入点。
S805、该接入点根据在该连续L个符号周期内接收该每个站点对应的发射天线发送的该每个站点的导频序列，确定包括该多个站点的导频序列的混合导频序列。
S806、该接入点对该混合导频序列进行DFT，生成频域序列。
该接入点的接收天线在第l个符号周期内导频子载波m上接收的混合导频序列可以为rm(l)。如忽略噪声，该rm(l)可以如下公式(10)所示。
Figure PCTCN2015073684-appb-000028
……公式(10)
其中，hm1为无线局域网中第一站点的发射天线在导频子载波m上至接 入点的接收天线的信道信息。hm2为无线局域网中第二站点的发射天线在导频子载波m上至接入点的接收天线的信道信息。p1(l)为第一站点在第l个符号周期内的导频模型，为
Figure PCTCN2015073684-appb-000029
p2(l)为第二站点在第l个符号周期内的导频模型，为
Figure PCTCN2015073684-appb-000030
θ1和θ2可以分别为该第一站点和第二站点的发射天线至该接入点的接收天线的相位偏差。
该接入点对该混合导频序列进行DFT，实际是对其中的rm1(l)和rm2(l)进行DFT。
该频域序列为
Figure PCTCN2015073684-appb-000031
该
Figure PCTCN2015073684-appb-000032
可以为如下公式(11)所示。
Figure PCTCN2015073684-appb-000033
……公式(11)
其中，
Figure PCTCN2015073684-appb-000034
和
Figure PCTCN2015073684-appb-000035
分别为该频域序列中的第一站点对应的子序列及第二站点对应的子序列。
因此，该频域序列中，该第一站点对应的子序列，也就是说，该第一站点的导频序列在变换域即频域上的一个单位信号宽度，即为该第一站点的导频模型的频率。Δ2>Δ1若即该频域序列中第一站点对应的子序列可如公式(12)所示。
Figure PCTCN2015073684-appb-000036
……公式(12)
该第二站点对应的子序列可如公式(13)所示。
Figure PCTCN2015073684-appb-000037
……公式(13)
S807、该接入点根据该每个站点的导频模型的频率，对该频域序列进行滤波，生成该每个站点对应的子序列。
该接入点可以是根据该第二站点的导频模型的频率Δ2对该频域序列
Figure PCTCN2015073684-appb-000038
进行滤波，从而滤除该
Figure PCTCN2015073684-appb-000039
中该第二站点对应的子序列，获得该第一站点对应的子序列，使得该第一站点对应的子序列如公式(14)所示。
Figure PCTCN2015073684-appb-000040
……公式(14)
该
Figure PCTCN2015073684-appb-000041
为第一站点对应的子序列。
该接入点可以是根据该第一站点的导频模型的频率Δ1对该频域序列
Figure PCTCN2015073684-appb-000042
进行滤波，从而滤除该
Figure PCTCN2015073684-appb-000043
中该第一站点对应的子序列，获得该第二站点对应的子序列，该第二站点对应的子序列可如公式(15)。
Figure PCTCN2015073684-appb-000044
……公式(15)
该
Figure PCTCN2015073684-appb-000045
为第二站点对应的子序列。
S808、该接入点对该每个站点对应的子序列进行IDFT，生成该每个站点的导频序列，该每个站点的导频序列包括该每个站点在连续L个符号周期内的导频序列。
该接入点可以分别对该第一站点对应的子序列及该第二站点对应的子序列进行IDFT，获得的该连续L个符号周期内该第一站点对应的子序列及该第二站点对应的子序列。该第一站点对应的子序列及该第二站点对应的子序列可分别如公式(16)和公式(17)所示。
Figure PCTCN2015073684-appb-000046
……公式(16)
Figure PCTCN2015073684-appb-000047
……公式(17)
Figure PCTCN2015073684-appb-000048
为该第一站点的导频序列，
Figure PCTCN2015073684-appb-000049
为该第二站点的导频序列。
S809、该接入点根据该连续L个符号周期内该每个站点的导频序列的相位的平均值，确定该每个站点的相位偏差。
该连续L个符号周期内该第一站点的导频序列的相位的平均值，可如公式(18)所示。
Figure PCTCN2015073684-appb-000050
……公式(18)
其中，conj(q1(l))为q1(l)的共轭，∠{q1(l+1)*conj(q1(l))}为q1(l+1)*conj(q1(l))的相位。其中，q1(l)可如公式(19)所示。
Figure PCTCN2015073684-appb-000051
……公式(19)
若不考虑噪声和干扰，公式(18)中，q1(l+1)*conj(q1(l))可如公式(20)所示。
Figure PCTCN2015073684-appb-000052
……公式(20)
对应的，该连续L个符号周期内该第二站点的导频序列的相位的平均值，可如公式(21)所示。
Figure PCTCN2015073684-appb-000053
……公式(21)
其中，conj(q2(l))为q2(l)的共轭，∠{q2(l+1)*conj(q2(l))}为q2(l+1)*conj(q2(l))的相位。其中，q2(l)可如公式(22)所示。
Figure PCTCN2015073684-appb-000054
……公式(22)
若不考虑噪声和干扰，公式(21)中q2(l+1)*conj(q2(l))可如下公式(23)所示。
Figure PCTCN2015073684-appb-000055
……公式(23)
该接入点可以是根据根据该公式(18)确定该第一站点的相位偏差，根据该公式(23)确定该第二站点的相位偏差。
本发明实施例六提供的相位偏差计算方法，通过具体实例对上述实施例一至实施例五中任一所述的方法进行说明，其有益效果与上述实施例类似，在此不再赘述。
本发明实施例七提供一种接入点。图9为本发明实施例七的接入点的结构示意图。该实施例七的接入点可执行上述实施例一、实施例二或实施例五中任一实施例的相位偏差计算方法。
如图9所示，该接入点900可包括：确定模块901、提取模块902及生成模块903。
其中，确定模块901，用于确定混合导频序列的频域序列，其中该混合导频序列包括多个站点的导频序列。
提取模块902，用于根据该多个站点中每个站点的导频模型从该频域序列中提取该每个站点对应的子序列；其中，该每个站点的导频模型的频率对该每个站点的相位偏差产生的偏移，不同于，其他站点的导频模型的频率对该其他站点的相位偏差产生的偏移；该其他站点为无线局域网中该多个站点中该每个站点外的站点。
生成模块903，用于根据该每个站点对应的子序列生成该每个站点的导频序列。
确定模块901，还用于根据该每个站点的导频序列确定该每个站点的相位偏差。
可选的，该每个站点的导频模型为
Figure PCTCN2015073684-appb-000056
l＝0,1,…,L-1，其中，p为预设导频，δ为预设常数，Δ为该每个站点的导频模型的频率，L为时域采样长度。
可选的，该接入点900还包括：
分配模块，用于在确定模块901确定该混合导频序列的该频域序列之前，为该多个站点中各站点分别分配一个导频模型。
发送模块，用于将为该多个站点分配的导频模型分别发送至该多个站点。
本发明实施例七的接入点可执行上述实施例一、实施例二或实施例五中任一实施例的相位偏差计算方法，其有益效果与上述实施例类似，在此不再赘述。
本发明实施例八还提供一种站点。图10为本发明实施例八的站点的结构示意图。该实施例八的站点可执行上述实施例三或实施例四提供的相位偏差的计算方法。如图10所示，该站点1000可包括：生成模块1001及发送模块1002。
生成模块1001，用于根据该站点的导频模型生成导频信号，其中，该站点的导频模型的频率对该站点的相位偏差产生的偏移，不同于其他站点的导频模型的频率对该其他站点的相位偏差产生的偏移；该其他站点为无线局域网中该站点外的站点。
发送模块1002，用于发送生成的导频信号。
可选的，该站点的导频模型为
Figure PCTCN2015073684-appb-000057
l＝0,1,…,L-1，其中，p为预设导频，δ为预设常数；Δ为所述站点的导频模型的频率，L为时域采样长度。
可选的，该站点1000还包括：
接收模块，用于在生成模块1001根据该站点的导频模型生成导频信号之前，接收接入点分配的该站点的导频模型。
本发明的实施例八的站点可执行上述实施例三或实施例四提供的相位偏差的计算方法，其有益效果与上述实施例类似，在此不再赘述。
本发明实施例九提供一种接入点。本发明实施例九的接入点可执行上述实施例一、实施例二或实施例五的相位偏差计算方法。图11为本发明实施例九的接入点的结构示意图。如图11所示，该接入点1100，包括：接收机 1101、处理器1102及发射机1103。
其中，处理器1102，用于确定混合导频序列的频域序列，根据该多个站点中每个站点的导频模型从该频域序列中提取该每个站点对应的子序列，根据该每个站点对应的子序列生成该每个站点的导频序列，根据该每个站点的导频序列确定该每个站点的相位偏差。
其中，该混合导频序列包括多个站点的导频序列；该每个站点的导频模型的频率对该每个站点的相位偏差产生的偏移，不同于，其他站点的导频模型的频率对该其他站点的相位偏差产生的偏移；该其他站点为无线局域网中该多个站点中该每个站点外的站点。
可选的，该每个站点的导频模型为
Figure PCTCN2015073684-appb-000058
l＝0,1,…,L-1，其中，p为预设导频，δ为预设常数，Δ为该每个站点的导频模型的频率，L为时域采样长度。
可选的，处理器1102，还用于在处理器1102确定该混合导频序列的该频域序列之前，为该多个站点中各站点分别分配一个导频模型。
发射机1103，用于将该多个站点的导频模型分别发送至该多个站点。
本发明实施例九的接入点可执行上述实施例一、实施例二或实施例五中任一实施例的相位偏差计算方法，其有益效果与上述实施例类似，在此不再赘述。
本发明实施例十还提供一种站点。图12为本发明实施例十的站点的结构示意图。该实施例十的站点可执行上述实施例三或实施例四提供的相位偏差的计算方法。如图12所示，该站点1200可包括：接收机1201、处理器1202及发射机1203。
其中，处理器1202，用于根据该站点的导频模型生成导频信号，其中，该站点的导频模型的频率对该站点的相位偏差产生的偏移，不同于其他站点的导频模型的频率对该其他站点的相位偏差产生的偏移；该其他站点为无线局域网中该站点外的站点。
发射机1203，用于发送生成的导频信号。
可选的，该站点的导频模型为
Figure PCTCN2015073684-appb-000059
l＝0,1,…,L-1，其中，p为预设导频，δ为预设常数；Δ为该站点的导频模型的频率，L为时域采样长度。
可选的，接收机1201，用于在处理器1202根据该站点的导频模型生成 导频信号之前，接收接入点分配的该站点的导频模型。
本发明的实施例十的站点可执行上述实施例三或实施例四提供的相位偏差的计算方法，其有益效果与上述实施例类似，在此不再赘述。
本领域普通技术人员可以理解：实现上述方法实施例的全部或部分步骤可以通过程序指令相关的硬件来完成，前述的程序可以存储于一计算机可读取存储介质中，该程序在执行时，执行包括上述方法实施例的步骤；而前述的存储介质包括：ROM、RAM、磁碟或者光盘等各种可以存储程序代码的介质。
最后应说明的是：以上各实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述各实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的范围。

Claims (18)

  1. 一种相位偏差计算方法，其特征在于，包括：
    接入点确定混合导频序列的频域序列，其中所述混合导频序列包括多个站点的导频序列；
    所述接入点根据所述多个站点中每个站点的导频模型从所述频域序列中提取所述每个站点对应的子序列；其中，所述每个站点的导频模型的频率对所述每个站点的相位偏差产生的偏移，不同于，其他站点的导频模型的频率对所述其他站点的相位偏差产生的偏移；所述其他站点为无线局域网中所述多个站点中所述每个站点外的站点；
    所述接入点根据所述每个站点对应的子序列生成所述每个站点的导频序列；
    所述接入点根据所述每个站点的导频序列确定所述每个站点的相位偏差。
  2. 根据权利要求1所述的方法，其特征在于，所述每个站点的导频模型为
    Figure PCTCN2015073684-appb-100001
    l＝0,1,…,L-1，其中，p为预设导频，δ为预设常数，Δ为所述每个站点的导频模型的频率，L为时域采样长度。
  3. 根据权利要求1或2所述的方法，其特征在于，所述接入点确定混合导频序列的频域序列之前，所述方法还包括：
    所述接入点为所述多个站点中各站点分别分配一个导频模型；
    所述接入点将为所述多个站点分配的导频模型分别发送至所述多个站点。
  4. 一种相位偏差计算方法，其特征在于，包括：
    站点根据所述站点的导频模型生成导频信号，其中，所述站点的导频模型的频率对所述站点的相位偏差产生的偏移，不同于其他站点的导频模型的频率对所述其他站点的相位偏差产生的偏移；所述其他站点为无线局域网中所述站点外的站点；
    所述站点发送生成的导频信号。
  5. 根据权利要求4所述的方法，其特征在于，所述站点的导频模型为
    Figure PCTCN2015073684-appb-100002
    l＝0,1,…,L-1，其中，p为预设导频，δ为预设常数；Δ为所述站点的导频模型的频率，L为时域采样长度。
  6. 根据权利要求4或5所述的方法，其特征在于，所述站点根据所述站点的导频模型生成导频信号之前，所述方法还包括：
    所述站点接收接入点分配的所述站点的导频模型。
  7. 一种接入点，其特征在于，包括：
    确定模块，用于确定混合导频序列的频域序列，其中所述混合导频序列包括多个站点的导频序列；
    提取模块，用于根据所述多个站点中每个站点的导频模型从所述频域序列中提取所述每个站点对应的子序列；其中，所述每个站点的导频模型的频率对所述每个站点的相位偏差产生的偏移，不同于，其他站点的导频模型的频率对所述其他站点的相位偏差产生的偏移；所述其他站点为无线局域网中所述多个站点中所述每个站点外的站点；
    生成模块，用于根据所述每个站点对应的子序列生成所述每个站点的导频序列；
    所述确定模块，还用于根据所述每个站点的导频序列确定所述每个站点的相位偏差。
  8. 根据权利要求7所述的接入点，其特征在于，所述每个站点的导频模型为
    Figure PCTCN2015073684-appb-100003
    l＝0,1,…,L-1，其中，p为预设导频，δ为预设常数，Δ为所述每个站点的导频模型的频率，L为时域采样长度。
  9. 根据权利要求7或所述的接入点，其特征在于，所述接入点还包括：
    分配模块，用于在所述确定模块确定所述混合导频序列的所述频域序列之前，为所述多个站点中各站点分别分配一个导频模型；
    发送模块，用于将为所述多个站点分配的导频模型分别发送至所述多个站点。
  10. 一种站点，其特征在于，包括：
    生成模块，用于根据所述站点的导频模型生成导频信号，其中，所述站点的导频模型的频率对所述站点的相位偏差产生的偏移，不同于其他站点的导频模型的频率对所述其他站点的相位偏差产生的偏移；所述其他站点为无线局域网中所述站点外的站点；
    发送模块，用于发送生成的导频信号。
  11. 根据权利要求10所述的站点，其特征在于，所述站点的导频模型 为
    Figure PCTCN2015073684-appb-100004
    l＝0,1,…,L-1，其中，p为预设导频，δ为预设常数；Δ为所述站点的导频模型的频率，L为时域采样长度。
  12. 根据权利要求10或11所述的站点，其特征在于，所述站点还包括：
    接收模块，用于在所述生成模块根据所述站点的导频模型生成导频信号之前，接收接入点分配的所述站点的导频模型。
  13. 一种接入点，其特征在于，包括：接收机、处理器及发射机；
    其中，所述处理器，用于确定混合导频序列的频域序列，根据所述多个站点中每个站点的导频模型从所述频域序列中提取所述每个站点对应的子序列，根据所述每个站点对应的子序列生成所述每个站点的导频序列，根据所述每个站点的导频序列确定所述每个站点的相位偏差；
    其中，所述混合导频序列包括多个站点的导频序列；所述每个站点的导频模型的频率对所述每个站点的相位偏差产生的偏移，不同于，其他站点的导频模型的频率对所述其他站点的相位偏差产生的偏移；所述其他站点为无线局域网中所述多个站点中所述每个站点外的站点。
  14. 根据权利要求13所述的接入点，其特征在于，所述每个站点的导频模型为
    Figure PCTCN2015073684-appb-100005
    l＝0,1,…,L-1，其中，p为预设导频，δ为预设常数，Δ为所述每个站点的导频模型的频率，L为时域采样长度。
  15. 根据权利要求13或14所述的接入点，其特征在于，
    所述处理器，还用于在所述处理器确定所述混合导频序列的所述频域序列之前，为所述多个站点中各站点分别分配一个导频模型；
    所述发射机，用于将所述多个站点的导频模型分别发送至所述多个站点。
  16. 一种站点，其特征在于，包括：接收机、处理器及发射机；
    其中，所述处理器，用于根据所述站点的导频模型生成导频信号，其中，所述站点的导频模型的频率对所述站点的相位偏差产生的偏移，不同于其他站点的导频模型的频率对所述其他站点的相位偏差产生的偏移；所述其他站点为无线局域网中所述站点外的站点；
    所述发射机，用于发送生成的导频信号。
  17. 根据权利要求16所述的站点，其特征在于，所述站点的导频模型 为
    Figure PCTCN2015073684-appb-100006
    l＝0,1,…,L-1，其中，p为预设导频，δ为预设常数；Δ为所述站点的导频模型的频率，L为时域采样长度。
  18. 根据权利要求16或17所述的站点，其特征在于，
    所述接收机，用于在所述处理器根据所述站点的导频模型生成导频信号之前，接收接入点分配的所述站点的导频模型。
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1635725A (zh) * 2003-12-31 2005-07-06 华为技术有限公司 一种正交频分复用***中实现同步的方法
CN101933302A (zh) * 2008-02-01 2010-12-29 高通股份有限公司 频率误差估计

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1635725A (zh) * 2003-12-31 2005-07-06 华为技术有限公司 一种正交频分复用***中实现同步的方法
CN101933302A (zh) * 2008-02-01 2010-12-29 高通股份有限公司 频率误差估计

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