CN100539481C - The production method of orthogonal FDM communication system subchannel access lead - Google Patents
The production method of orthogonal FDM communication system subchannel access lead Download PDFInfo
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Abstract
A kind of production method that is used for orthogonal FDM communication system subchannel access lead comprises step: use useful subcarrier transmission signals, other subcarriers do not use, and promptly place zero; Spendable useful subcarrier is divided into subchannel; Place frequency domain training sequence in the subcarrier in the subchannel that uses, place zero on the subcarrier of other subchannel, and it is carried out inverse-Fourier transform formation OFDM subchannel access lead.The PAPR value of new sequence of the present invention is lower, can reduce the non-linear power requirement, reduces cost, and reduces nonlinear distortion simultaneously, improves estimated performance.On the other hand, can come modulation sequence, so also can improve estimated performance with higher average power.Only need to use a sequence, the frequency domain training sequence that corresponding any subchannel uses can extract and get, thereby significantly reduce stored memory from this sequence.Adopt new sequence without any need for unnecessary control signal, that is to say, bring any redundancy can for the MAC layer of system.
Description
Technical field
The present invention relates to OFDM communications and insert (OFDMA) technical field, specifically, the present invention relates generally to the access lead (to call preamble in the following text) of a kind of new OFDMA in the ofdma communication system physical layer.
Background technology
OFDM (OFDM) technology has just put forward as far back as the sixties as a kind of high speed transmission technology of wireless communication system.In the last few years, because the develop rapidly of Digital Signal Processing and asic technology, the realization of ofdm system became a reality, and the OFDM technology receives publicity once again and studies.OFDM has obtained generally acknowledging both at home and abroad as mobile radio communications system technology of future generation.
The OFDMA system is based on the multiple access to communication system of OFDM technology, and in the OFDMA system, all available subcarriers are divided into subchannel, and according to the division methods difference, subchannel can contain one or more subcarriers.Different subchannels is distributed to different users in can be at one time.More effective like this frequency band that utilizes improves power system capacity.Because the use of subchannel has reduced the power peak-to-average ratio, help the mobile of user terminal and improve the coverage of sub-district simultaneously.
When a certain user used a certain subchannel, this user only need be at the subchannel transmitting data of this appointment.In a lot of OFDMA systems, for the purpose of synchronous and channel estimating, the user is some training symbols of transmission before the transmission data or in transmission course, and we are called access lead (Preamble)
Preamble in the actual OFDMA system obtains on the frequency domain known sequences being IFFT on specific subchannel, and we claim that this kind sequence is a frequency domain training sequence.
In the 256FFT OFDM of high-performance metropolitan area network standard Hiperman and IEEE802.16e physical layer, have 256 subcarriers, label is-128 to 127, but the actual label of only having used is 200 subcarriers of-100 to 100, wherein zero subcarrier need not.
Except 256FFT OFDM pattern, Hiperman also adopts 256FFT OFDMA pattern, and 802.16e also adopts 256FFT OFDMA pattern at present.256 OFDMA patterns are that whole available subcarrier is divided into a plurality of subchannels, and different at one time users is using different subchannels.Corresponding each subchannel all should have a kind of frequency domain training sequence.
According to subchannel Preamble design principle, simultaneously in conjunction with the actual environment for use of this Preamble.We analyze and draw: present different subchannel Preamble also need to optimize.
Summary of the invention
The purpose of this invention is to provide subchannel access lead production method new in a kind of OFDM access communication system.
For achieving the above object, a kind of production method that is used for orthogonal FDM communication system subchannel access lead comprises step:
Use useful subcarrier transmission signals, other subcarriers do not use, and promptly place zero;
Spendable useful subcarrier is divided into subchannel;
Place frequency domain training sequence on the subcarrier in the subchannel that uses, place zero on the subcarrier of other subchannel, and it is carried out inverse-Fourier transform formation OFDM subchannel access lead.
The PAPR value of new sequence of the present invention is lower, because lower PAPR reduces the non-linear power requirement, reduces cost, and reduces nonlinear distortion simultaneously, improves estimated performance.On the other hand, during low PAPR, can come modulation sequence, so also can improve estimated performance with higher average power; Only need to use a sequence.The frequency domain training sequence that corresponding any subchannel uses can extract and get, thereby significantly reduce stored memory from this sequence.Adopt new sequence without any need for unnecessary control signal, that is to say, bring any redundancy can for the MAC layer of system.
Description of drawings
Fig. 1 is the system diagram of OFDMA transmitter;
Fig. 2 is the system diagram of OFDM transmitter;
Fig. 3 is the time-domain signal after the Cyclic Prefix operation, and wherein, CP represents Cyclic Prefix;
Fig. 4 is the access lead of subchannel, and wherein Tg represents the length of Cyclic Prefix, and Tb represents the length of an OFDM data symbol.
Embodiment
OFDMA system basic principle is to divide whole OFDM subcarrier into a lot of sub carrier group, and we are referred to as subchannel.Different users can use different subchannels at one time.The advantage of OFDM has not only been inherited by the OFDMA system, also has data transmission rate more flexibly simultaneously, bigger power system capacity and bigger coverage.
The OFDMA system is divided into N subcarrier from low to high with whole frequency band, and label is [N/2:N/2-1], and generally speaking, in order to prevent monkey chatter, the subcarrier that is positioned at the band edge edge is not used.For the convenience on realizing, label is that zero subcarrier is not used yet simultaneously.Any signal is not promptly placed in obsolete subcarrier zero setting.
The Preamble of actual OFDMA system sub-channels obtains on the frequency domain known sequences being IFFT on specific subchannel, and we claim that this kind sequence is a frequency domain training sequence.
The OFDMA system basic parameter that the present invention is directed to is:
1) total number of sub carrier wave is 256, and label is [128:127];
2) number of sub carrier wave of Shi Yonging is 200, label [100:-1,1:100];
3) number of sub carrier wave that is used to transmit pilot tone is 8, and label is
[-88，-63，-38，-13，13，38，63，88]；
4) subcarrier that is positioned at boundary belt is 55, and label is [128:-101,101:127].
This system divides 200 spendable subcarriers into a plurality of subchannels, divides as follows:
(1) when being divided into 16 subchannels, the subcarrier that subchannel comprises is as follows
S1：[-100:-98，-37:-35，1:3，64:66]；
S2：[-97:-95，-34:-32，4:6，67:69]；
S3：[-94:-92，-31:-29，7:9，70:72]；
S4：[-91:-89，-28:-26，10:12，73:75]；
S5：[-87:-85，-50:-48，14:16，51:53]；
S6：[-84:-82，-47:-45，17:19，54:56]；
S7：[-81:-79，-44:-42，20:22，57:59]；
S8：[-78:-76，-41:-39，23:25，60:62]；
S9：[-75:-73，-12:-10，26:28，89:91]；
S10：[-72:-70，-9:-7，29:31，92:94]；
S11：[-69:-67，-6:-4，32:34，95:97]；
S12：[-66:-64，-3:-1，35:37，98:100]；
S13：[-62:-60，-25:-23，39:41，76:78]；
S14：[-59:-57，-22:-20，42:44，79:81]；
S15：[-56:-54，-19:-17，45:47，82:84]；
S16：[-53:-51，-16:-14，48:50，85:87]；
(2) when being divided into eight subchannels, the subcarrier that subchannel comprises is as follows
S17：[-100:-95，-38：-32，1:6，64:69]；
S18：[-94:-89，-31:-26，7:13，70:75]；
S19：[-88:-82，-50:-45，14:19，51:56]；
S20：[-81:-76，-44:-39，20:25，57:63]；
S21：[-75:-70，-13:-7，26:31，89:94]；
S22：[-69:-64，-6:-1，32:38，95:100]；
S23：[-63:-57，-25:-20，39:44，76:81]；
S24：[-56:-51，-19:-14，45:50，82:88]；
(3) when being divided into four subchannels, the subcarrier that subchannel comprises is as follows
S25：[-100:-89，-38:-26，1:13，64:75]；
S26：[-88:-76，-50:-39，14:25，51:63]；
S27：[-75:-64，-13:-1，26:38，89:100]；
S28：[-63:-51，-25:-14，39:50，76:88]；
(4) when being divided into two subchannels, the subcarrier that subchannel comprises is as follows
S29：[-100:-76，-50:-26，1:25，51:75]；
S30：[-75:-51，-25:-1，26:50，76:100]；
In the ofdm system, as shown in Figure 2, the serial data symbol is divided into piece { p
j| j=-N/2 ..., N/2-1} (wherein N is an IFFT length, corresponding OFDM modulated sub-carriers (subcarrier) label of j), parallel being placed on carried out quick inverse-Fourier transform (IFFT) and obtained the OFDM symbol on the corresponding subcarrier:
Behind the IFFT, this OFDM data-signal is carried out launching by antenna through digital to analog conversion and up-conversion after the Cyclic Prefix operation.
p
jCan contain pilot signal, in addition, if p
jBe to be frequency domain training sequence, the OFDM symbol that obtains so is an access lead.
Time-domain signal after the Cyclic Prefix operation as shown in Figure 3.
Corresponding to system parameters of the present invention, p
jBeing that label is to be placed with on [100:1,1:100] with symbol (data symbol, pilot tone or frequency domain training sequence) at the subcarrier that uses only, is zero on other subcarrier.
Corresponding to the OFDMA system, as Fig. 1, when if a certain user makes a certain subchannel, when generating data symbol, the data modulation symbol that modulation mapper comes out generates and the subchannel corresponding symbol piece that uses through deserializer, select corresponding subchannel by the subchannel maker, load mapper by subchannel and the corresponding symbol piece is placed on accordingly on the subcarrier of subchannel, on corresponding subcarrier, place pilot signal simultaneously.In the time will generating the access lead of subchannel, behind generation of subchannel frequency domain sequence maker and the corresponding frequency domain sequence of this subchannel, select corresponding subchannel by the subchannel maker, load mapper by subchannel then corresponding frequency domain sequence is placed on the subcarrier of subchannel accordingly.Subchannel loads the p that mapper comes out
jOnly containing useful signal on the subcarrier on the subchannel that this user uses, is zero on other subcarrier.Then to p
jCarry out the IFFT operation.
When generating the access lead of above a certain subchannel, can and get from the following sequences extraction corresponding to the frequency domain training sequence of this subchannel:
Seq(-100:100)＝[-1+i，1+i，-1+i，1-i，-1-i，1-i，-1+i，1+i，
-1+i，-1+i，1+i，-1+i，-1-i，-1-i，-1+i，-1-i，1+i，1-i，
1+i，-1-i，-1+i，-1-i，-1-i，-1+i，-1-i，1+i，1+i，-1-i，
1+i，-1+i，1+i，1+i，1+i，-1-i，-1-i，1-i，-1-i，-1-i，
1+i，1-i，1+i，1+i，-1-i，-1-i，1+i，1-i，1+i，-1-i，
1+i，1+i，-1-i，-1-i，1+i，1+i，1+i，-1-i，-1-i，-1-i，
1+i，-1-i，-1-i，1+i，-1+i，-1+i，-1+i，1-i，1-i，1-i，
-1+i，-1+i，-1+i，1-i，-1+i，-1+i，1-i，1+i，1+i，-1-i，
1+i，-1+i，1+i，1+i，1+i，-1-i，-1-i，1-i，-1-i，1-i，
-1-i，-1+i，-1-i，-1-i，1+i，1+i，-1-i，-1+i，-1-i，1+i，
-1-i，-1-i，0，1-i，-1+i，-1+i，1-i，-1+i，-1+i，1-i，
-1+i，-1+i，-1+i，1-i，1-i，1-i，1+i，-1-i，-1-i，1+i，
-1-i，-1-i，1+i，-1-i，-1-i，-1-i，1+i，1+i，-1-i，-1-i，
1+i，-1-i，1-i，-1-i，-1-i，-1-i，1+i，1+i，-1+i，1+i，
1-i，-1-i，-1+i，-1-i，-1-i，1+i，1+i，-1-i，-1+i，-1-i，
1+i，-1-i，-1-i，1+i，-1+i，1+i，1+i，-1+i，1+i，1+i，
-1+i，1+i，-1-i，1-i，-1-i，1+i，1-i，1+i，1-i，
1-i，1+i，1-i，1-i，1+i，1-i，-1+i，-1-i，-1+i，1+i，
1+i，-1-i，1+i，-1+i，1+i，1+i，1+i，-1-i，-1-i，1-i，
-1-i，-1-i，-1-i，-1+i，-1-i，-1-i，1+i，1+i，-1-i，
-1+i，-1-i，1+i，-1-i，-1-i]*W
Here only provide the value of label for training symbol on from-100 to 100 subcarriers, other positions are zero, and promptly label is for being zero on-128 to-101 and 101 to 127 the subcarrier, and wherein W is a coefficient of determining, can be any real number or plural number.This sequence is a sequence of complex numbers, and the element of sequence is a plural number, represents the QPSK modulation.
According to above-mentioned frequency domain training sequence, when the user who uses a certain subchannel will generate access lead corresponding to this subchannel, on sequence Seq, be placed on the subcarrier of this subchannel corresponding to extracting the element correspondence on the position of the subcarrier label in this subchannel.If this subchannel uses pilot tone, on the position of the pilot tone label that uses corresponding to this subchannel on the sequence Seq, extract the element correspondence so simultaneously and be placed on the subcarrier of corresponding pilot tone.Other subcarrier does not use, and promptly places zero.Carry out the IFFT operation then.The access lead that generates as shown in Figure 4.
Claims (6)
1. production method that is used for orthogonal FDM communication system subchannel access lead comprises step:
Use useful subcarrier transmission signals, other subcarriers do not use, and promptly place zero;
Spendable useful subcarrier is divided into subchannel;
Place frequency domain training sequence on the subcarrier in the subchannel that uses, place zero on the subcarrier of other subchannel, and it is carried out inverse-Fourier transform formation OFDM subchannel access lead.
2. by the described method of claim 1, it is characterized in that described useful subcarrier is 200, label is [100:-1,1:100].
3. by the described method of claim 1, it is characterized in that when in 16 subchannels below the use any one,
S1：[-100：-98，-37：-35，1：3，64：66]；
S2：[-97：-95，-34：-32，4：6，67：69]；
S3：[-94：-92，-31：-29，7：9，70：72]；
S4：[-91：-89，-28：-26，10：12，73：75]；
S5：[-87：-85，-50：-48，14：16，51：53]；
S6：[-84：-82，-47：-45，17：19，54：56]；
S7：[-81：-79，-44：-42，20：22，57：59]；
S8：[-78：-76，-41：-39，23：25，60：62]；
S9：[-75：-73，-12：-10，26：28，89：91]；
S10：[-72：-70，-9：-7，29：31，92：94]；
S11：[-69：-67，-6：-4，32：34，95：97]；
S12：[-66：-64，-3：-1，35：37，98：100]；
S13：[-62：-60，-25：-23，39：41，76：78]；
S14：[-59：-57，-22：-20，42：44，79：81]；
S15：[-56：-54，-19：-17，45：47，82：84]；
S16：[-53：-51，-16：-14，48：50，85：87]；
Frequency domain training sequence corresponding to this subchannel can extract and get from following sequences, sequence Seq goes up corresponding to extracting the element correspondence on the subcarrier label location of subchannel and is placed on the subcarrier of this subchannel below, and other subcarrier does not use, and promptly places zero, carry out the IFFT operation then
Seq (100:100)=[1+i, 1+i ,-1+i, 1-i ,-1-i, 1-i ,-1+i, 1+i ,-1+i ,-1+i, 1+i ,-1+i ,-1-i ,-1-i,-1+i ,-1-i, 1+i, 1-i, 1+i ,-1-i ,-1+i,-1-i ,-1-i ,-1+i ,-1-i, 1+i, 1+i ,-1-i, 1+i ,-1+i, 1+i, 1+i, 1+i ,-1-i ,-1-i, 1-i ,-1-i ,-1-i, 1+i, 1-i, 1+i, 1+i,-1-i ,-1-i, 1+i, 1-i, 1+i ,-1-i, 1+i, 1+i ,-1-i ,-1-i, 1+i, 1+i, 1+i ,-1-i,-1-i ,-1-i, 1+i ,-1-i ,-1-i, 1+i ,-1+i,-1+i ,-1+i, 1-i, 1-i, 1-i ,-1+i ,-1+i,-1+i, 1-i ,-1+i ,-1+i, 1-i, 1+i, 1+i,-1-i, 1+i ,-1+i, 1+i, 1+i, 1+i ,-1-i,-1-i, 1-i ,-1-i, 1-i ,-1-i ,-1+i ,-1-i,-1-i, 1+i, 1+i ,-1-i ,-1+i ,-1-i, 1+i,-1-i ,-1-i, 0,1-i ,-1+i ,-1+i, 1-i,-1+i ,-1+i, 1-i ,-1+i ,-1+i ,-1+i, 1-i, 1-i, 1-i, 1+i ,-1-i ,-1-i, 1+i ,-1-i,-1-i, 1+i ,-1-i ,-1-i ,-1-i, 1+i, 1+i,-1-i ,-1-i, 1+i ,-1-i, 1-i ,-1-i ,-1-i,-1-i, 1+i, 1+i ,-1+i, 1+i, 1-i ,-1-i,-1+i ,-1-i ,-1-i, 1+i, 1+i ,-1-i ,-1+i,-1-i, 1+i ,-1-i ,-1-i, 1+i ,-1+i, 1+i, 1+i ,-1+i, 1+i, 1+i ,-1+i, 1+i ,-1-i, 1-i ,-1-i, 1+i, 1-i, 1+i, 1-i, 1-i, 1+i, 1-i, 1-i, 1+i, 1-i,-1+i ,-1-i ,-1+i, 1+i, 1+i ,-1-i, 1+i ,-1+i, 1+i, 1+i, 1+i ,-1-i,-1-i, 1-i ,-1-i ,-1-i ,-1-i ,-1+i,-1-i ,-1-i, 1+i, 1+i ,-1-i ,-1+i,-1-i, 1+i ,-1-i ,-1-i] * W, wherein, W is a coefficient of determining.
4. press the described method of claim 1, when it is characterized in that any one in using following eight subchannels,
S17：[-100：-95，-38：-32，1：6，64：69]；
S18：[-94：-89，-31：-26，7：13，70：75]；
S19：[-88：-82，-50：-45，14：19，51：56]；
S20：[-81：-76，-44：-39，20：25，57：63]；
S21：[-75：-70，-13：-7，26：31，89：94]；
S22：[-69：-64，-6：-1，32：38，95：100]；
S23：[-63：-57，-25：-20，39：44，76：81]；
S24：[-56：-51，-19：-14，45：50，82：88]；
Frequency domain training sequence corresponding to this subchannel can extract and get from following sequences, sequence Seq goes up corresponding to extracting the element correspondence on the subcarrier label location of subchannel and is placed on the subcarrier of this subchannel below, and other subcarrier does not use, and promptly places zero, carry out the IFFT operation then
Seq (100:100)=[1+i, 1+i ,-1+i, 1-i ,-1-i, 1-i ,-1+i, 1+i ,-1+i ,-1+i, 1+i ,-1+i ,-1-i ,-1-i,-1+i ,-1-i, 1+i, 1-i, 1+i ,-1-i ,-1+i,-1-i ,-1-i ,-1+i ,-1-i, 1+i, 1+i ,-1-i, 1+i ,-1+i, 1+i, 1+i, 1+i ,-1-i ,-1-i, 1-i ,-1-i ,-1-i, 1+i, 1-i, 1+i, 1+i,-1-i ,-1-i, 1+i, 1-i, 1+i ,-1-i, 1+i, 1+i ,-1-i ,-1-i, 1+i, 1+i, 1+i ,-1-i,-1-i ,-1-i, 1+i ,-1-i ,-1-i, 1+i ,-1+i,-1+i ,-1+i, 1-i, 1-i, 1-i ,-1+i ,-1+i,-1+i, 1-i ,-1+i ,-1+i, 1-i, 1+i, 1+i,-1-i, 1+i ,-1+i, 1+i, 1+i, 1+i ,-1-i,-1-i, 1-i ,-1-i, 1-i ,-1-i ,-1+i ,-1-i,-1-i, 1+i, 1+i ,-1-i ,-1+i ,-1-i, 1+i,-1-i ,-1-i, 0,1-i ,-1+i ,-1+i, 1-i,-1+i ,-1+i, 1-i ,-1+i ,-1+i ,-1+i, 1-i, 1-i, 1-i, 1+i ,-1-i ,-1-i, 1+i ,-1-i,-1-i, 1+i ,-1-i ,-1-i ,-1-i, 1+i, 1+i,-1-i ,-1-i, 1+i ,-1-i, 1-i ,-1-i ,-1-i,-1-i, 1+i, 1+i ,-1+i, 1+i, 1-i ,-1-i,-1+i ,-1-i ,-1-i, 1+i, 1+i ,-1-i ,-1+i,-1-i, 1+i ,-1-i ,-1-i, 1+i ,-1+i, 1+i, 1+i ,-1+i, 1+i, 1+i ,-1+i, 1+i ,-1-i, 1-i ,-1-i, 1+i, 1-i, 1+i, 1-i, 1-i, 1+i, 1-i, 1-i, 1+i, 1-i,-1+i ,-1-i ,-1+i, 1+i, 1+i ,-1-i, 1+i ,-1+i, 1+i, 1+i, 1+i ,-1-i,-1-i, 1-i ,-1-i ,-1-i ,-1-i ,-1+i,-1-i ,-1-i, 1+i, 1+i ,-1-i ,-1+i,-1-i, 1+i ,-1-i ,-1-i] * W, wherein, W is a coefficient of determining.
5. press the described method of claim 1, when it is characterized in that any one in using following four subchannels,
S25：[-100：-89，-38：-26，1：13，64：75]；
S26：[-88：-76，-50：-39，14：25，51：63]；
S27：[-75：-64，-13：-1，26：38，89：100]；
S28:[-63:-51 ,-25:-14,39:50,76:88]; Frequency domain training sequence corresponding to this subchannel can extract and get from following sequences, sequence Seq goes up corresponding to extracting the element correspondence on the subcarrier label location of subchannel and is placed on the subcarrier of this subchannel below, and other subcarrier does not use, and promptly places zero, carry out the IFFT operation then
Seq (100:100)=[1+i, 1+i ,-1+i, 1-i ,-1-i, 1-i ,-1+i, 1+i ,-1+i ,-1+i, 1+i ,-1+i ,-1-i ,-1-i,-1+i ,-1-i, 1+i, 1-i, 1+i ,-1-i ,-1+i,-1-i ,-1-i ,-1+i ,-1-i, 1+i, 1+i ,-1-i, 1+i ,-1+i, 1+i, 1+i, 1+i ,-1-i ,-1-i, 1-i ,-1-i ,-1-i, 1+i, 1-i, 1+i, 1+i,-1-i ,-1-i, 1+i, 1-i, 1+i ,-1-i, 1+i, 1+i ,-1-i ,-1-i, 1+i, 1+i, 1+i ,-1-i,-1-i ,-1-i, 1+i ,-1-i ,-1-i, 1+i ,-1+i,-1+i ,-1+i, 1-i, 1-i, 1-i ,-1+i ,-1+i,-1+i, 1-i ,-1+i ,-1+i, 1-i, 1+i, 1+i,-1-i, 1+i ,-1+i, 1+i, 1+i, 1+i ,-1-i,-1-i, 1-i ,-1-i, 1-i ,-1-i ,-1+i ,-1-i,-1-i, 1+i, 1+i ,-1-i ,-1+i ,-1-i, 1+i,-1-i ,-1-i, 0,1-i ,-1+i ,-1+i, 1-i,-1+i ,-1+i, 1-i ,-1+i ,-1+i ,-1+i, 1-i, 1-i, 1-i, 1+i ,-1-i ,-1-i, 1+i ,-1-i,-1-i, 1+i ,-1-i ,-1-i ,-1-i, 1+i, 1+i,-1-i ,-1-i, 1+i ,-1-i, 1-i ,-1-i ,-1-i,-1-i, 1+i, 1+i ,-1+i, 1+i, 1-i ,-1-i,-1+i ,-1-i ,-1-i, 1+i, 1+i ,-1-i ,-1+i,-1-i, 1+i ,-1-i ,-1-i, 1+i ,-1+i, 1+i, 1+i ,-1+i, 1+i, 1+i ,-1+i, 1+i ,-1-i, 1-i ,-1-i, 1+i, 1-i, 1+i, 1-i, 1-i, 1+i, 1-i, 1-i, 1+i, 1-i,-1+i ,-1-i ,-1+i, 1+i, 1+i ,-1-i, 1+i ,-1+i, 1+i, 1+i, 1+i ,-1-i,-1-i, 1-i ,-1-i ,-1-i ,-1-i ,-1+i,-1-i ,-1-i, 1+i, 1+i ,-1-i ,-1+i,-1-i, 1+i ,-1-i ,-1-i] * W, wherein, W is a coefficient of determining.
6. press the described method of claim 1, when it is characterized in that any one in using following two subchannels,
S29：[-100：-76，-50：-26，1：25，51：75]；
S30：[-75：-51，-25：-1，26：50，76：100]；
Frequency domain training sequence corresponding to this subchannel can extract and get from following sequences, sequence Seq goes up corresponding to extracting the element correspondence on the subcarrier label location of subchannel and is placed on the subcarrier of this subchannel below, and other subcarrier does not use, and promptly places zero, carry out the IFFT operation then
Seq(-100：100)＝[-1+i，1+i，-1+i，1-i，-1-i，1-i，-1+i，1+i，-1+i，-1+i，1+i，-1+i，-1-i，-1-i，-1+i，-1-i，1+i，1-i，1+i，-1-i，-1+i，-1-i，-1-i，-1+i，-1-i，1+i，1+i，-1-i，1+i，-1+i，1+i，1+i，1+i，-1-i，-1-i，1-i，-1-i，-1-i，1+i，1-i，1+i，1+i，-1-i，-1-i，1+i，1-i，1+i，-1-i，1+i，1+i，-1-i，-1-i，1+i，1+i，1+i，-1-i，-1-i，-1-i，1+i，-1-i，-1-i，1+i，-1+i，-1+i，-1+i，1-i，1-i，1-i，-1+i，-1+i，
-1+i, 1-i ,-1+i ,-1+i, 1-i, 1+i, 1+i,-1-i, 1+i ,-1+i, 1+i, 1+i, 1+i ,-1-i,-1-i, 1-i ,-1-i, 1-i ,-1-i ,-1+i ,-1-i,-1-i, 1+i, 1+i ,-1-i ,-1+i ,-1-i, 1+i,-1-i ,-1-i, 0,1-i ,-1+i ,-1+i, 1-i,-1+i ,-1+i, 1-i ,-1+i ,-1+i ,-1+i, 1-i, 1-i, 1-i, 1+i ,-1-i ,-1-i, 1+i ,-1-i,-1-i, 1+i ,-1-i ,-1-i ,-1-i, 1+i, 1+i,-1-i ,-1-i, 1+i ,-1-i, 1-i ,-1-i ,-1-i,-1-i, 1+i, 1+i ,-1+i, 1+i, 1-i ,-1-i,-1+i ,-1-i ,-1-i, 1+i, 1+i ,-1-i ,-1+i,-1-i, 1+i ,-1-i ,-1-i, 1+i ,-1+i, 1+i, 1+i ,-1+i, 1+i, 1+i ,-1+i, 1+i ,-1-i, 1-i ,-1-i, 1+i, 1-i, 1+i, 1-i, 1-i, 1+i, 1-i, 1-i, 1+i, 1-i,-1+i ,-1-i ,-1+i, 1+i, 1+i ,-1-i, 1+i ,-1+i, 1+i, 1+i, 1+i ,-1-i,-1-i, 1-i ,-1-i ,-1-i ,-1-i ,-1+i,-1-i ,-1-i, 1+i, 1+i ,-1-i ,-1+i,-1-i, 1+i ,-1-i ,-1-i] * W, wherein, W is a coefficient of determining.
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