CN102035785A - Frequency-division duplexing transmission method for wideband wireless communication system - Google Patents
Frequency-division duplexing transmission method for wideband wireless communication system Download PDFInfo
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Abstract
The invention relates to a frequency-division duplexing transmission method for a wideband wireless communication system, belonging to the technical field of digital information transmission. The method comprises the following steps of: carrying out downlink multiple access at the transmitting end of a base station by adopting a time-domain and frequency-domain united orthogonal frequency division multiple access technology to obtain a downlink signal; carrying out uplink multiple access at the transmitting end of user equipment by adopting a time-domain and frequency-domain united single carrier multiple access technology to obtain an uplink signal; and carrying out duplexing transmission on the downlink signal and the uplink signal by adopting a frequency-division duplexing frame structure. A TFU-OFDMA (Time domain and Frequency domain United Orthogonal Frequency Division Multiple Access) technology provided by the invention can be used for solving the multiple access problem of modulation by adopting TFU-OFDM (Time domain and Frequency domain United Orthogonal Frequency Division Multiplexing) and has the advantages of flexibly allocating wireless resources, effectively resisting deep fading and narrow-band interference and the like; and by using a TFU-SCMA (Time domain and Frequency domain United-Single Carrier Multiple Access) technology provided by the invention, the multiple access problem of modulation by adopting the improved SC-FDE (Single Carrier-Frequency Domain Equalization) can be solved, the advantages that the transmitting end has low complexity and peak-to-average power ratio by the SC-FDE technology can be retained and the synchronization and channel estimation can be better carried out by the receiving end.
Description
Technical field
The invention belongs to digital information transmission technical field, relate in particular to the Frequency Division Duplexing (FDD) transmission method in the system of broadband wireless communication.
Background technology
System of broadband wireless communication can pass through Frequency Division Duplexing (FDD) (Frequency Division Duplexing, hereinafter to be referred as FDD) method realizes the full duplex transmission of signal, promptly descending (communication link from the base station transmits to the subscriber equipment) signal sends on two different frequency bands respectively in the same time with up (communication link from the user device transmissions to the base station) signal.
The transmission of signal in the broadband wireless communications need overcome problems such as frequency selective fading that multipath effect and Doppler effect by channel brought and time selective fading.OFDM (Orthogonal Frequency Division Multiplexing, hereinafter to be referred as OFDM) and the proposition of single carrier frequency domain equalization technology such as (Single Carrier-Frequency Domain Equalization are hereinafter to be referred as SC-FDE) for the practicable means that provide are provided.
The SC-FDE technology is filled Cyclic Prefix (Cyclic Prefix is hereinafter to be referred as CP) and is formed the transmission of SC-FDE symbol in each data block end; After receiving terminal is removed CP, carry out discrete Fourier transform (DFT) (Discrete Fourier Transform, hereinafter to be referred as DFT) obtain frequency-region signal, utilize channel estimation results to carry out frequency domain equalization then, carry out inverse discrete fourier transform (Inverse Discrete Fourier Transform is hereinafter to be referred as IDFT) at last and be converted to serial data stream promptly obtaining initial data.The SC-FDE technology can effectively be resisted channel fading, and has lower peak-to-average power ratio.
The OFDM technology converts data flow to the multidiameter delay data, and adds pilot signal, carries out IDFT then and obtains the time-domain signal data block, inserts CP and form the transmission of OFDM symbol before the time-domain signal data block; Receiving terminal carries out DFT and obtains frequency-region signal after removing CP, utilizes channel estimation results to carry out frequency domain equalization then, is converted to serial data stream again and promptly obtains initial data.The improvement version of a kind of OFDM is disclosed in the Chinese patent [CN200810227375.6]---time domain and frequency domain combined orthogonal frequency division multiplexi (Time domain and Frequency domain United Orthogonal Frequency Division Multiplexing, hereinafter to be referred as TFU-OFDM), this technology has replaced CP in traditional OFDM technology with the PN sequence, so both keep traditional OFDM technology and realized channel estimating easily, effectively resist advantages such as channel fading, had accurately and obtained fast the advantage of synchronizing information again.
In system of broadband wireless communication, communicate simultaneously in order to satisfy a plurality of users, will carry out the multiple access division to wireless channel and distinguish different users with identification.A kind of like this signal transmission technology of multiple users share wireless channel of supporting is called multiple access technique.
Time division multiple access (Time Division Multiple Access is hereinafter to be referred as TDMA) scheme is divided Radio Resource in time.In the TDMA scheme, the time is divided into time slot, and different user uses wireless channel to realize Channel Sharing in different time-gap.But this scheme must take whole bandwidth when requiring the user to use channel at every turn, causes very high peak power easily and therefore forms lower radio-frequency power, and be subjected to the influence of deep fading and narrow band interference easily.
It is to put forward the multiple access access scheme at the OFDM technology that OFDM inserts (Orthogonal Frequency Division MultipleAccess is hereinafter to be referred as OFDMA).In the OFDMA scheme, whole channel width is divided into the subcarrier of a plurality of quadratures, and these subcarriers are divided into following three types: data subcarrier is used for transmitting each road user profile; Pilot sub-carrier, the transmission training sequence is used for carrying out channel estimating; The gap carrier wave comprises protection subcarrier and direct current subcarrier, is changed to 0, does not transmit any information.Each road user profile is used a subclass (being called subchannel) of data subcarrier, and each subchannel is given any one tunnel user profile by specific assigned at any time.All subcarriers after distributing are carried out IDFT, and add CP, be converted to serial data stream (being called an OFDMA symbol) at last and send.This scheme is distributing radio resource neatly, adapts to the different transmission rate of each user well, effectively resists deep fading and narrow band interference, but is unfavorable for that receiving terminal carries out time synchronized apace.
Summary of the invention
The objective of the invention is for overcoming the weak point of prior art, a kind of Frequency Division Duplexing (FDD) transmission method that is used for system of broadband wireless communication is proposed, this method inserts (Time domain and Frequency domain United Orthogonal Frequency Division Multiple Access with time domain and frequency domain combined OFDM, hereinafter to be referred as TFU-OFDMA) be the downlink multi-access access technology, inserting (Time domain and Frequency domain United-Single Carrier Multiple Access is hereinafter to be referred as TFU-SCMA) with time domain and frequency domain combined single carrier multiple access is uplink multiple access technology.
A kind of Frequency Division Duplexing (FDD) transmission method that is used for system of broadband wireless communication that the present invention proposes is characterized in that: this method is included in the base station transmitting terminal and adopts time domain and frequency domain combined OFDM access technology to carry out the downlink multi-access access, obtains downstream signal; Adopt time domain and frequency domain combined single carrier multiple access technique to realize that uplink multi-address inserts, and obtains upward signal at the subscriber equipment transmitting terminal; Adopt the Frequency Division Duplexing (FDD) frame structure that downstream signal and upward signal are carried out duplex transmission;
Describedly adopt time domain and frequency domain combined OFDM access technology to carry out downlink multi-access at the base station transmitting terminal to insert, obtain downstream signal, specifically may further comprise the steps:
(11) respectively each road user's transport block data that will send is carried out chnnel coding and digital modulation, obtain the information after the digital modulation;
(12) each road user profile and the pilot tone after will modulating is mapped on corresponding data subcarrier and the pilot sub-carrier, and all data subcarriers are divided into a plurality of subchannels, the corresponding one or more subchannels of each road user profile; Protection subcarrier and direct current subcarrier put 0; Pilot tone is used for receiving terminal and carries out channel estimating and time synchronized;
(13) all subcarriers to step (12) carry out inverse discrete Fourier transform, obtain time-domain signal;
(14) generate a PN (pseudo noise) sequence, this PN (pseudo noise) sequence is filled to a protection intervening sequence in the mode of cyclic extensions, the time-domain signal that to protect intervening sequence and step (13) to obtain merges, carry out and go here and there being converted to a time domain and frequency domain combined OFDM access symbol, promptly obtain downstream signal and transmission;
Described in the time domain and frequency domain combined single carrier multiple access technique realization uplink multi-address access of subscriber equipment transmitting terminal employing, the acquisition upward signal specifically may further comprise the steps:
(21) transport block data that each subscriber equipment transmitting terminal will be sent is carried out chnnel coding and digital modulation, obtains the information after the digital modulation;
(22) information after the digital modulation is carried out time domain and frequency domain combined single carrier multiple access and insert modulation, obtain time domain and frequency domain combined single carrier multiple access and insert symbol;
(23) according to the schedule information of base station, each subscriber equipment transmitting terminal sends time domain and frequency domain combined single carrier multiple access and inserts symbol in specified time slot, be in the wait transmit status at all the other time slots;
Adopt the Frequency Division Duplexing (FDD) frame structure that downstream signal and upward signal are carried out duplex transmission, specifically comprise:
In the Frequency Division Duplexing (FDD) frame structure, the duration that every frame is set is 10ms, is made up of descending sub frame, sub-frame of uplink, residual time and four parts of retention time; Descending sub frame is used for transmission of downlink signal, take a certain section frequency band, sub-frame of uplink is used to transmit upward signal, take the frequency band that another section is not overlapping with descending shared frequency band and bandwidth is identical, residual time is the remaining time after the descending sub frame end of transmission in every frame, and retention time is the stand-by period before sub-frame of uplink begins to transmit in every frame; It is 9900us that the descending sub frame duration is set, and the sub-frame of uplink duration is 9360us, and retention time is 520us.
Characteristics of the present invention and beneficial effect
The TFU-OFDMA technology that the present invention proposes, the multiple access that has solved when adopting the TFU-OFDM modulation inserts problem, has distributing radio resource neatly, adapts to the different transmission rate of each user well, effectively resists advantages such as deep fading and narrow band interference.
The TFU-SCMA technology that the present invention proposes, the multiple access that has solved when adopting improved SC-FDE to modulate inserts problem, improved SC-FDE technology is the improvement to traditional SC-FDE technology: not only kept SC-FDE technology transmitting terminal complexity and hanged down and advantages such as peak-to-average power ratio is low, and made receiving terminal carry out better synchronously and channel estimating.
The FDD frame structure that the present invention proposes has been realized the full duplex transmission of signal under TFU-OFDMA technology and TFU-SCMA technology.
Description of drawings
Fig. 1 is a signal transmission flow block diagram in the TFU-OFDMA technology that proposes of the present invention.
Fig. 2 is the TFU-OFDMA technology sub-carriers classification schematic diagram that the present invention proposes.
Fig. 3 is a TFU-OFDMA symbolic construction schematic diagram in the TFU-OFDMA technology that proposes of the present invention.
Fig. 4 is the PN (pseudo noise) sequence generation method schematic diagram that the present invention adopts.
Fig. 5 is a signal transmission flow block diagram in the TFU-SCMA technology that proposes of the present invention.
Fig. 6 is a TFU-SCMA symbolic construction block diagram among the TFU-SCMA that proposes of the present invention.
Fig. 7 is the FDD frame structure schematic diagram that the present invention proposes.
Fig. 8 is the descending sub frame structural representation in the FDD frame that proposes of the present invention.
Fig. 9 is the downlink communication data division resource division schematic diagram in the FDD frame that proposes of the present invention.
Figure 10 is the sub-frame of uplink structural representation in the FDD frame that proposes of the present invention.
Embodiment
The Frequency Division Duplexing (FDD) transmission method that is applicable to system of broadband wireless communication that the present invention proposes reaches embodiment in conjunction with the accompanying drawings and is described as follows:
A kind of Frequency Division Duplexing (FDD) transmission method that is used for system of broadband wireless communication that the present invention proposes is characterized in that:
This method is included in the base station transmitting terminal and adopts time domain and frequency domain combined OFDM access (TFU-OFDMA) technology to carry out the downlink multi-access access, obtains downstream signal; Adopt time domain and frequency domain combined single carrier multiple access to insert (TFU-SCMA) technology at the subscriber equipment transmitting terminal and realize that uplink multi-address inserts, and obtains upward signal; Adopt Frequency Division Duplexing (FDD) (FDD) frame structure that downstream signal and upward signal are carried out duplex transmission.
Describedly adopt the TFU-OFDMA technology to carry out downlink multi-access at the base station transmitting terminal to insert, obtain the flow process of downstream signal, as shown in Figure 1, may further comprise the steps:
(11) respectively each road user's transport block data that will send is carried out chnnel coding and digital modulation, obtain the information after the digital modulation; Described chnnel coding can adopt convolution code, low density parity check code or Reed Solomon code etc.; Described digital modulation can adopt multi-system phase shift keying or M-ary orthogonal amplitude modulation(PAM) etc.;
(12) each road user profile and the pilot tone after will modulating is mapped on corresponding data subcarrier and the pilot sub-carrier, and all data subcarriers are divided into a plurality of subchannels, the corresponding one or more subchannels of each road user profile; Protection subcarrier and direct current subcarrier put 0; Pilot tone is used for receiving terminal and carries out channel estimating and time synchronized; Specifically comprise:
(12-1) set in advance the position of all kinds of subcarriers: all protection subcarriers are divided into left boundary belt and right boundary belt, and left boundary belt and right boundary belt lay respectively at the left and right two ends of channel band; The direct current subcarrier is one, is positioned at band center; Remaining data subcarrier and pilot sub-carrier are distributed between left and right boundary belt and the direct current subcarrier, as shown in Figure 2; The total number N of data subcarrier and pilot sub-carrier
uSatisfy: N
u=28L, L are positive integer; The particular location of data subcarrier and pilot sub-carrier is as follows:
(12-1a) all data subcarriers and pilot sub-carrier are divided into 4L group continuously, each group comprises 6 data subcarriers and 1 pilot sub-carrier, and pilot sub-carrier is positioned at every group centre position, and the call number of establishing group is i, i=0, and 1 ..., 4L-1;
(12-1b) with above-mentioned all components be L set, S
0, S
1..., S
L-1, each set comprises 4 groups, respectively organizes pairing call number S in each set
l(k) be:
Wherein, S
l(k) k organizes pairing call number in l set of expression, l=0, and 1 ... L-1, k=0,1,2,3, sequence
By length is that the constant series left sides cyclic shift of L obtains for k time; The constant series of different length L correspondence are as shown in table 1;
Constant series under table 1 different length
Be S (12-2) with call number in the step (12-1a)
l(k), k=0,1,2,3, the data subcarrier that group comprised form subchannel l, l=0,1 ... L-1; According to the schedule information of base station, each road user profile is mapped in one or more subchannels of appointment;
Subcarrier allocation parameter in the step (12) under the different sub carrier sum M is as shown in table 2;
Table 2 subcarrier allocation parameter
| Total number of sub-carriers M | 128 | 256 | 512 | 1024 | 2048 |
| Direct current sub-carrier indices I DC | 64 | 128 | 256 | 512 | 1024 |
| Left side boundary belt sub-carrier number N L | 22 | 44 | 88 | 176 | 352 |
| Right boundary belt sub-carrier number N R | 21 | 43 | 87 | 175 | 351 |
| Pilot sub-carrier is counted N p | 12 | 24 | 48 | 96 | 192 |
| Data subcarrier is counted N d | 72 | 144 | 288 | 576 | 1152 |
| Sub-carrier number N in the subchannel u | 24 | 24 | 24 | 24 | 24 |
| Number of |
3 | 6 | 12 | 24 | 48 |
(13) all subcarriers to step (12) carry out inverse discrete Fourier transform, obtain time-domain signal; Inverse Fourier transform can adopt the method for inverse fast Fourier transform, to simplify computational complexity;
(14) generate a PN (pseudo noise) sequence; this PN (pseudo noise) sequence is filled to a protection intervening sequence in the mode of cyclic extensions; the time-domain signal that to protect intervening sequence and step (13) to obtain merges; and carry out and go here and there being converted to a TFU-OFDMA symbol, promptly obtain downstream signal and transmission.
Above-mentioned steps (12)-(14) are the TFU-OFDMA modulation step.
The TFU-OFDMA symbolic construction comprises protection interval and data block two parts as shown in Figure 3, and protection is filled above-mentioned protection intervening sequence at interval, is made up of PN (pseudo noise) sequence and forward and backward expansion thereof; Data block is the time-domain signal that step (13) obtains, and comprises data and pilot tone;
A kind of embodiment that above-mentioned PN (pseudo noise) sequence generates can adopt linear feedback shift register to generate; Figure 4 shows that the PN (pseudo noise) sequence generation method on one 4 rank; Mould 2 Hes represented in plus sige wherein, i.e. 0+0=0,0+1=1,1+0=1,1+1=0.Suppose register 1,2,3,4 initial condition is respectively 0,0,0,1, then by calculate can obtain output sequence be 1000100110101111000...... as can be seen since the 16th, sequence repeats the 1st output; Be that this is that one-period is 15 periodic sequence, get a segment length arbitrarily and be 15 sequence and be needed PN (pseudo noise) sequence; As get preceding 15 composition sequences 100010011010111 then.
Described in time domain and frequency domain combined single carrier multiple access access (TFU-SCMA) technology realization uplink multi-address access of subscriber equipment transmitting terminal employing, obtain the flow process of upward signal, as shown in Figure 5, may further comprise the steps:
(21) transport block data that each subscriber equipment transmitting terminal will be sent is carried out chnnel coding and digital modulation, obtains the information after the digital modulation; Described chnnel coding can adopt convolution code, low density parity check code or Reed Solomon code etc.; Described modulation system can adopt multi-system phase shift keying or M-ary orthogonal amplitude modulation(PAM) etc.;
(22) information after the digital modulation is carried out the TFU-SCMA modulation, obtain the TFU-SCMA symbol;
The concrete steps of the information after the digital modulation being carried out the TFU-SCMA modulation are as follows:
(22-1) with after step (21) modulation information translation be parallel data block;
(22-2) generate the UW sequence, and constitute pilot blocks with one or more UW;
UW chooses Chu sequence (being proposed by David C.Chu) or Frank-Zadoff sequence (uniting proposition by R.L.Frank and S.A.Zadoff) as the UW sequence in the present embodiment, and its length is 2 the inferior power of positive integer, and the length maximum is no more than 256; When UW was used as the protection interval, the UW sequence length was not less than the length of channel maximum delay; For example, when system bandwidth was 8MHz, UW length can get 64, comprised 4 UW in the pilot blocks;
Length is that homophase (In-phase is hereinafter to be referred as the I) road and quadrature (Quadrature is hereinafter to be referred as Q) the road signal of the UW sequence of U (U is a positive integer) can be produced by following formula respectively:
I[n]＝cos(θ[n])
Q[n]＝sin(θ[n])
Wherein n is 0 arbitrary integer in the U-1 scope;
Wherein phase theta [n] can have two kinds of selections, when producing the Frank-Zadoff sequence, gets θ [n]=θ
Frank[n], when producing the Chu sequence, θ [n]=θ
Chu[n];
θ
FrankThe expression formula of [n] is:
R=1 wherein, 3 or with
Coprime integer.
θ
ChuThe expression formula of [n] is:
n＝0，1，...，U-1
(22-3) UW being inserted in the parallel data block rear end does to protect interval group to become the DFT piece;
(22-4) insert above-mentioned pilot blocks, form a TFU-SCMA symbol, as shown in Figure 6, promptly obtain upward signal and send by pilot blocks and DFT piece at DFT piece front end;
(23) according to the schedule information of base station, each subscriber equipment transmitting terminal sends the TFU-SCMA symbol in specified time slot, be in the wait transmit status at all the other time slots;
Adopt the FDD frame structure that downstream signal and upward signal are carried out duplex transmission, concrete grammar is as follows:
In this FDD frame structure, the duration that every frame is set is 10ms, is made up of descending sub frame, sub-frame of uplink, residual time and four parts of retention time, and its structure as shown in Figure 7; Descending sub frame is used for transmission of downlink signal, take a certain section frequency band, sub-frame of uplink is used to transmit upward signal, take the frequency band that another section is not overlapping with descending shared frequency band and bandwidth is identical, residual time is the remaining time after the descending sub frame end of transmission in every frame, and retention time is the stand-by period before sub-frame of uplink begins to transmit in every frame; It is 9900us that the descending sub frame duration is set, and the sub-frame of uplink duration is 9360us, and retention time is 520us;
The concrete structure of described descending sub frame and sub-frame of uplink is as follows:
Descending sub frame is made up of N TFU-OFDMA symbol; The descending sub frame content comprises: leading, common control information, broadcast data and downlink communication data, as shown in Figure 8; The leading initial ranging that is used for, down channel quality measurement etc. are positioned at descending sub frame foremost, take N
1Individual TFU-OFDMA symbol; Common control information is used to transmit the map information of downlink communication data, the system control messages such as map information of uplink communication data, is positioned at leading back, takies N
2Individual TFU-OFDMA symbol; Remove the leading and shared TFU-OFDMA outer symbol of common control information, remaining N in the descending sub frame
3Individual symbol transmits broadcast data and downlink communication data simultaneously, and broadcast data takies different subchannels respectively with the downlink communication data, broadcast data partly is used for transmission of one line or the shared user profile of multichannel, and the downlink communication data division is used to transmit the proprietary user profile of multichannel; In the downlink communication data division, continuous S TFU-OFDMA symbol is divided into a symbols; Resource allocation elementary cell (Resource Allocation Element is hereinafter to be referred as RAE) takies a symbols in time, takies a subchannel on frequency domain; Each road user profile all takies an integer RAE; Above-mentioned N, N
1, N
2, N
3, S is positive integer, and N 〉=20,1≤N
1≤ 3,1≤N
2≤ 10, N
3=N-N
1-N
2, S≤N-N
1-N
2, (N-N
1-N
2) mod S=0;
In the present embodiment, above-mentioned each parameter is provided with as follows:
N＝88，N
1＝1，N
2＝7，S＝20。
That shown in Figure 9 is the resource allocation embodiment of 3 subchannels and 4 symbols, and the lattice among the figure is RAE, supposes to have 4 tunnel proprietary user profile, and the shared RAE of each road user profile represents with specific grid pattern;
Sub-frame of uplink is made up of K time slot, and each time slot duration is 360us, and the sub-frame of uplink content comprises access at random and bandwidth request part on opportunity and uplink burst data part; Preceding K
1Each time slot in the individual time slot is divided into 4 mini-slot, each mini-slot all is one and is used for inserting at random or transmission opportunity of bandwidth request, need insert at random or the UE of bandwidth request sends in certain transmission opportunity that a carrying inserts at random or the short TFU-SCMA symbol (symbol duration equals 90us) of bandwidth request information; Remaining K
2Individual time slot is used to transmit uplink burst data, and m uplink burst piece takies preceding m time slot of uplink burst data part, and each uplink burst piece is made up of a long TFU-SCMA symbol (symbol duration equals 360us); The uplink transmission block sum that all users of m value and current time need be transmitted is relevant; Above-mentioned K, K
1, K
2, m is positive integer, and K＞10,0＜K
1＜K, K
2=K-K
1, 0≤m≤K
2
Above-mentioned sub-frame of uplink structure as shown in figure 10;
In the present embodiment, above-mentioned each parameter is provided with as follows:
K＝26，K
1＝4，K
2＝22。
Claims (5)
1. Frequency Division Duplexing (FDD) transmission method that is used for system of broadband wireless communication is characterized in that: this method is included in the base station transmitting terminal and adopts time domain and frequency domain combined OFDM access technology to carry out downlink multi-access to insert, obtain downstream signal; Adopt time domain and frequency domain combined single carrier multiple access technique to realize that uplink multi-address inserts, and obtains upward signal at the subscriber equipment transmitting terminal; Adopt the Frequency Division Duplexing (FDD) frame structure that downstream signal and upward signal are carried out duplex transmission;
Describedly adopt time domain and frequency domain combined OFDM access technology to carry out downlink multi-access at the base station transmitting terminal to insert, obtain downstream signal, specifically may further comprise the steps:
(11) respectively each road user's transport block data that will send is carried out chnnel coding and digital modulation, obtain the information after the digital modulation;
(12) each road user profile and the pilot tone after will modulating is mapped on corresponding data subcarrier and the pilot sub-carrier, and all data subcarriers are divided into a plurality of subchannels, the corresponding one or more subchannels of each road user profile; Protection subcarrier and direct current subcarrier put 0; Pilot tone is used for receiving terminal and carries out channel estimating and time synchronized;
(13) all subcarriers to step (12) carry out inverse discrete Fourier transform, obtain time-domain signal;
(14) generate a PN (pseudo noise) sequence, this PN (pseudo noise) sequence is filled to a protection intervening sequence in the mode of cyclic extensions, the time-domain signal that to protect intervening sequence and step (13) to obtain merges, carry out and go here and there being converted to a time domain and frequency domain combined OFDM access symbol, promptly obtain downstream signal and transmission;
Described in the time domain and frequency domain combined single carrier multiple access technique realization uplink multi-address access of subscriber equipment transmitting terminal employing, the acquisition upward signal specifically may further comprise the steps:
(21) transport block data that each subscriber equipment transmitting terminal will be sent is carried out chnnel coding and digital modulation, obtains the information after the digital modulation;
(22) information after the digital modulation is carried out time domain and frequency domain combined single carrier multiple access and insert modulation, obtain time domain and frequency domain combined single carrier multiple access and insert symbol;
(23) according to the schedule information of base station, each subscriber equipment transmitting terminal sends time domain and frequency domain combined single carrier multiple access and inserts symbol in specified time slot, be in the wait transmit status at all the other time slots;
Adopt the Frequency Division Duplexing (FDD) frame structure that downstream signal and upward signal are carried out duplex transmission, specifically comprise:
In the Frequency Division Duplexing (FDD) frame structure, the duration that every frame is set is 10ms, is made up of descending sub frame, sub-frame of uplink, residual time and four parts of retention time; Descending sub frame is used for transmission of downlink signal, take a certain section frequency band, sub-frame of uplink is used to transmit upward signal, take the frequency band that another section is not overlapping with descending shared frequency band and bandwidth is identical, residual time is the remaining time after the descending sub frame end of transmission in every frame, and retention time is the stand-by period before sub-frame of uplink begins to transmit in every frame; It is 9900us that the descending sub frame duration is set, and the sub-frame of uplink duration is 9360us, and retention time is 520us.
2. method according to claim 1 is characterized in that described step (12) specifically comprises:
(12-1) set in advance the position of all kinds of subcarriers: all protection subcarriers are divided into left boundary belt and right boundary belt, and left boundary belt and right boundary belt lay respectively at the left and right two ends of channel band; The direct current subcarrier is one, is positioned at band center; Remaining data subcarrier and pilot sub-carrier are distributed between left and right boundary belt and the direct current subcarrier; The total number N of data subcarrier and pilot sub-carrier
uSatisfy: N
u=28L, L are positive integer; The particular location of data subcarrier and pilot sub-carrier is as follows:
(12-1a) all data subcarriers and pilot sub-carrier are divided into 4L group continuously, each group comprises 6 data subcarriers and 1 pilot sub-carrier, and pilot sub-carrier is positioned at every group centre position, and the call number of establishing group is i, i=0, and 1 ..., 4L-1;
(12-1b) with above-mentioned all components be L set, S
0, S
1... S
L-1, each set comprises 4 groups, respectively organizes pairing call number S in each set
1(k) be:
Wherein, S
l(k) k organizes pairing call number in l set of expression, l=0, and 1 ... L-1, k=0,1,2,3, sequence
By length is that the constant series left sides cyclic shift of L obtains for k time;
Be S (12-2) with call number in the step (12-1a)
l(k), k=0,1,2,3, the data subcarrier that group comprised form subchannel l, l=0,1 ... L-1; According to the schedule information of base station, each road user profile is mapped in one or more subchannels of appointment.
3. as method as described in the claim 2, it is characterized in that, described time domain and frequency domain combined OFDM inserts symbolic construction and comprises protection interval and data block two parts, and protection is filled above-mentioned protection intervening sequence at interval, is made up of PN (pseudo noise) sequence and forward and backward expansion thereof; Data block is the time-domain signal that step (13) obtains.
4. as method as described in the claim 2, it is characterized in that described step (22) specifically comprises:
(22-1) with after step (21) modulation information translation be parallel data block;
(22-2) generate the UW sequence, and constitute pilot blocks with one or more UW;
(22-3) UW being inserted in the parallel data block rear end does to protect interval group to become the DFT piece;
(22-4) insert above-mentioned pilot blocks, form a time domain and frequency domain combined single carrier multiple access by pilot blocks and DFT piece and insert symbol, promptly obtain upward signal and send at DFT piece front end;
5. method according to claim 1 is characterized in that, described descending sub frame inserts symbol by N time domain and frequency domain combined OFDM and forms; The descending sub frame content comprises: leading, common control information, broadcast data and downlink communication data; The leading initial ranging that is used for, down channel quality is measured, and is positioned at descending sub frame foremost, takies N
1Individual time domain and frequency domain combined OFDM inserts symbol; Common control information is used to transmit the map information of downlink communication data, the map information system control message of uplink communication data, is positioned at leading back, takies N
2Individual time domain and frequency domain combined OFDM inserts symbol; Remove time domain and frequency domain combined OFDM leading and that common control information is shared in the descending sub frame and insert outer symbol, remaining N
3Individual symbol transmits broadcast data and downlink communication data simultaneously, and broadcast data takies different subchannels respectively with the downlink communication data, broadcast data partly is used for transmission of one line or the shared user profile of multichannel, and the downlink communication data division is used to transmit the proprietary user profile of multichannel; In the downlink communication data division, continuous S time domain and frequency domain combined OFDM inserted symbol be divided into a symbols; The resource allocation elementary cell takies a symbols in time, takies a subchannel on frequency domain; Each road user profile all takies an integer resource allocation elementary cell; Above-mentioned N, N
1, N
2, N
3, S is positive integer, and N 〉=20,1≤N
1≤ 3,1≤N
2≤ 10, N
3=N-N
1-N
2, S≤N-N
1-N
2, (N-N
1-N
2) modS=0;
Described sub-frame of uplink is made up of K time slot, and each time slot duration is 360us, and the sub-frame of uplink content comprises access at random and bandwidth request part on opportunity and uplink burst data part; Preceding K
1Each time slot in the individual time slot is divided into 4 mini-slot, each mini-slot all is one and is used for inserting at random or transmission opportunity of bandwidth request, need insert at random or the UE of bandwidth request sends in certain transmission opportunity that a carrying inserts at random or the duration of bandwidth request information is that the time domain and frequency domain combined OFDM of 90us inserts symbol; Remaining K
2Individual time slot is used to transmit uplink burst data, and m uplink burst piece takies preceding m time slot of uplink burst data part, and each uplink burst piece is that the time domain and frequency domain combined OFDM access symbol of 360us is formed by a duration; Above-mentioned K, K
1, K
2, m is positive integer, and K＞10,0＜K
1＜K, K
2=K-K
1, 0≤m≤K
2
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