CN1205770C - Orthogonal frequency division multiplex transmission system for digital surface broadcasting - Google Patents
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- CN1205770C CN1205770C CN 01130988 CN01130988A CN1205770C CN 1205770 C CN1205770 C CN 1205770C CN 01130988 CN01130988 CN 01130988 CN 01130988 A CN01130988 A CN 01130988A CN 1205770 C CN1205770 C CN 1205770C
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Abstract
The present invention discloses a signal transmitting method of a transmission system of digital terrestrial broadcasting COFDM. The sampling rate of baseband digital modulation signals is 10MHz, a frame of OFDM signals are composed of 64 OFDM symbols, each OFDM symbol is composed of a plurality of carrier signals whose persistent period is Ts, wherein the carrier signals comprise a plurality of data signal sub carriers, mobile pilot frequency sub carriers, continuous pilot frequency sub carriers and TPS pilot frequency sub carriers, and various carriers are regularly arranged. Continuous pilot frequency and mobile pilot frequency sub carrier reference signals are obtained by a pseudo random binary sequence which is also used for the 2DPSK modulation and initialization of the TPS pilot frequency sub carriers. 64 bits of each TPS block comprise 1 initialization bit, 16 synchronization bits, 34 information bits and 13 redundancy bits which are used for error code protection. The signal transmitting method of the present invention obviously increase the performance of COFDM transmission systems, and simultaneously enables receivers to be realized simply.
Description
Technical field the invention belongs to field of signal transmissions, particularly the method for transmitting signals in the DTB Digital Terrestrial Broadcasting system of employing OFDM modulating mode (OFDM).
The typical DTB Digital Terrestrial Broadcasting transmission system of background technology comprises transmitter and receiver.Digital modulation technique often carries out modulating after the chnnel coding to digital signal, adds necessary supplementary such as pilot signal again, forms filtering through channel spectrum then and becomes the base-band digital modulation signal.This digital signal is modulated onto frequency band corresponding through digital to analog converter, upconverter and sends.At receiving terminal, low-converter becomes baseband signal with radiofrequency signal, and the process analog to digital converter is to obtain digital signal again.This digital signal is resumed and the consistent information of making a start behind digital demodulation, channel-decoding.Fig. 1 has provided typical DTB Digital Terrestrial Broadcasting transmission system block diagram.
The digital coding modulating unit of DTB Digital Terrestrial Broadcasting COFDM transmission system carries out a series of digital processing to the input data.It comprises data randomization, outer coding (being generally the Reed-Solomon sign indicating number), interweave outward (being generally convolutional interleave), interior coding (being generally convolution or grid code), in interweave (being generally time and frequency 2-dimensional interleaving), shine upon, add pilot signal, system information, OFDM (realizing with IFFT usually), add and protect interval (being generally cyclic extensions), shaping filter etc.Its processing module flow process is seen Fig. 2.
In DTB Digital Terrestrial Broadcasting COFDM transmission system, outside the number of it is believed that of transmission signals divisor, also comprise the mobile pilot signal and the continuous pilot signal that are used for channel estimating, synchronization acquistion and tracking, and be used for business transferring type system transmission of Information parameter signalling (TPS) signal.Ratio and the position arrangement of each pilot sub-carrier in subcarrier has material impact to the performance of COFDM transmission system.
Summary of the invention the objective of the invention is to provide a kind of method for transmitting signals for DTB Digital Terrestrial Broadcasting COFDM transmission system, the structure of this method by arranging data subcarrier reasonably and each pilot sub-carrier is to improve the performance of COFDM transmission system, and the while can be reduced the complexity of receiver.
The method for transmitting signals of the present invention's design is such: in DTB Digital Terrestrial Broadcasting COFDM transmission system, base-band digital modulation signal sample rate is 10MHz, and ofdm signal Seize ACK message bandwidth is 7.62MHz.The OFDM transmission signals is made up of frame, and a frame ofdm signal is made up of 64 OFDM symbols.Each OFDM symbol is that a plurality of carrier signals of Ts are formed by the duration.Symbol duration Ts comprises that the duration is useful part and duration of Tu to be
ΔThe protection compartment of T.Each OFDM symbol is made up of a plurality of sub-carrier signals.In Fast Fourier Transform Inverse (IFFT) block size was 2048 mode of operation (being commonly called as " 2K mode of operation "), sub-carrier number was 1561; In the IFFT block size was 4096 mode of operation (being commonly called as " 4K mode of operation "), sub-carrier number was 3121; In the IFFT block size was 8192 mode of operation (being commonly called as " 8K mode of operation "), sub-carrier number was 6241.Each OFDM symbol also contains the mobile pilot subcarrier signals and the continuous pilot sub-carrier signal that are useful on channel estimating, synchronization acquistion and tracking except that the sub-carrier signal that is loaded with data, and the TPS sub-carrier signal that is used for business transferring type system information.For the 2K mode of operation, the data-signal number of sub carrier wave is 1392, and mobile pilot sub-carrier number is 130, and the continuous pilot sub-carrier number is 41, and the TPS sub-carrier number is 8.For the 4K mode of operation, the data subcarrier number is 2784, and mobile pilot sub-carrier number is 260, and the continuous pilot sub-carrier number is 81, and the TPS sub-carrier number is 16.For the 8K mode of operation, the data subcarrier number is 5568, and mobile pilot sub-carrier number is 520, and the continuous pilot sub-carrier number is 161, and the TPS sub-carrier number is 32.
Data subcarrier adopts multilevel quadrature amplitude (MQAM) modulation or phase shift keying (MPSK) modulation, continuous pilot and mobile pilot sub-carrier adopt binary phase shift keying (BPSK) modulation, and the TPS subcarrier adopts BDPSK binary differential phase shift keying (2DPSK) modulation.
Continuous pilot and mobile pilot sub-carrier reference signal are by a pseudo-random binary sequence w
kObtain.Pseudo-random binary sequence w
kAlso be used for transmission parameter signaling TPS subcarrier is carried out 2DPSK modulation initialization.
The modulation of all data cells is through normalization, and making average power level is 1.All pilot tones (continuously with mobile) subcarrier and TPS subcarrier are launched on the power that promotes, and making average power level is 16/9.
Transmission parameter signaling (TPS) is defined on continuous 64 OFDM symbols of an ofdm signal frame.Each OFDM symbol transmits a TPS bit.Each TPS piece (corresponding to an OFDM frame) is made up of 64 bits, comprising: 1 initialization bit, 16 synchronization bits, 34 information bits and 13 redundant bits that are used for error protection.For 34 information bits, can only use a part wherein, and with remainder as standby.The corresponding pseudo-random binary sequence w of TPS sub-carrier positions of each first symbol of OFDM frame
kBe applied to the 2DBPSK modulation initialization of this position TPS sub-carrier signal.
The method for transmitting signals of the present invention's design has following many beneficial effects: ofdm signal Seize ACK message bandwidth is 7.62MHz, and sample rate is that 10MHz helps frequency domain filtering and spectrum shaping; The OFDM frame signal is made up of 64 OFDM symbols, adopt that the input code length is 50, the output code length be 63 binary system basis Bo Si-Cha Dehuli-Huo Kun lattice nurse (BCH) sign indicating number is used for the transmission parameter signaling signal that strong error protection, difference bi-phase modulated preferably are arranged; Relative and the center balanced configuration of continuous pilot, but simplified receiver is realized; The command transmitting parameter contains multiple information, can realize mixing, single, stratified operation pattern flexibly, is used for moving receiving and the fixing business that receives; Each pilot power can be realized the multiple channel estimation function that reaches synchronously all greater than signal power 3dB; Reference signal is produced by one 13 rank pseudo-random sequence generator, can not occur periodically repeating to 2K, 4K, 8K pattern.
Further describe embodiments of the invention below in conjunction with accompanying drawing.
Description of drawings Fig. 1 is typical DTB Digital Terrestrial Broadcasting transmission system block diagram.
Fig. 2 is a DTB Digital Terrestrial Broadcasting COFDM transmission system digital coding modulation function module flow chart.
Fig. 3 is the PRBS sequencer.
Fig. 4 is the frame structure schematic diagram of OFDM transmission signals.
Embodiment is in DTB Digital Terrestrial Broadcasting COFDM transmission system, and base-band digital modulation signal sample rate is 10MHz, and ofdm signal Seize ACK message bandwidth is 7.62MHz.The OFDM transmission signals is made up of frame, and each frame signal comprises 64 OFDM symbols.Each OFDM symbol is that a plurality of carrier signals of Ts are formed by the duration.Symbol duration Ts comprises that the duration is that useful part and duration of Tu is Δ
TThe protection compartment.Protection is inserted in before the useful part at interval, and it has a plurality of values to choose, and as can choosing Tu/4, Tu/8, Tu/16, Tu/32, but is not limited thereto several values.8K mode of operation Tu is 819.2 microseconds, and 4K mode of operation Tu is 409.6 microseconds, and 2K mode of operation Tu is 204.8 microseconds.Each OFDM symbol is except that the sub-carrier signal that is loaded with data, also contain the mobile pilot tone and the continuous pilot sub-carrier signal that are useful on channel estimating, synchronization acquistion and tracking, and the TPS sub-carrier signal that is used for system transmissions type of service (as single, mixing and hierarchical modulation) information.The data subcarrier signal adopts many level Modulation and Amplitude Modulation (MQAM) or phase shift keying (MPSK) modulation, continuous pilot and mobile pilot subcarrier signals adopt binary phase shift keying (BPSK) modulation, and the TPS sub-carrier signal adopts binary phase shift keying (2DPSK) modulation.
Continuous pilot and mobile pilot sub-carrier reference signal are by a pseudo-random binary sequence w
kObtain.Pseudo-random binary sequence w
kProduce according to Fig. 3, produce the connection multinomial that the generator of this pseudo-random binary sequence uses and be: x
13+ x
4+ x
3+ x+1.It is initialized as 11111111111, the first output bit of this pseudo-random binary sequence is overlapped with first effective subcarrier.Whether (no matter pilot tone) produces a new numerical value by this sequence on the carrier wave of each use.This pseudo-random binary sequence w
kAlso be used for transmission parameter signaling TPS subcarrier is carried out 2DPSK modulation initialization.
With 64 OFDM symbols that constitute a frame be defined as successively the 0th, the 1st ..., the 63rd OFDM symbol.The position of the mobile pilot sub-carrier of these 64 OFDM symbols is different, and its distribution is relevant with symbol index i (0～63).I OFDM symbol, mobile position set of pilot subcarriers S
iFor: k=K
Min+ 3 * (i mod4)+12p, p is 〉=0 integer, i ∈ [0,63], k ∈ [K
Min, K
Max], wherein, K
Min=0, for 2K mode of operation, K
Max=1560; For 4K mode of operation, K
Max=3120; For 8K mode of operation, K
Max=6240.
Mobile pilot sub-carrier position as shown in Figure 4.By pseudo-random binary sequence w
kTransmit in the mobile pilot cell that the reference information that obtains scatters in each symbol.The pilot cell that moves is always launched on the power level of " promoting the back ", is modulated to accordingly:
Re(C
m，k)＝4/3·(1-2·w
k)
Im (C
M, kIn the formula of)=0, m is the indication of OFDM symbol time, and k is the sub-carrier frequencies indication.
The number of continuous pilot subcarrier changes with the system works pattern.In the 2K mode of operation, the continuous pilot sub-carrier number is 41; In the 4K mode of operation, the continuous pilot sub-carrier number is 81; And in the 8K mode of operation, the continuous pilot sub-carrier number is 161.The continuous pilot sub-carrier positions of 64 OFDM symbols is identical with value in the OFDM transmission signal frame.The position of continuous pilot subcarrier is about centre frequency position symmetry (is 0 with respect to the center sum).Table 1,2,3 provides a kind of continuous pilot sub-carrier positions collection about centre frequency position symmetry.
Table 1 2K mode of operation continuous pilot sub-carrier positions collection
| 0，15，69，162，177，216，270，351，375，414，429，480， 516，537，594，603，639，666，741，768，780，792，831，852， 882，921，966，1023，1050，1095，1146，1185，1200，1209， 1278，1344，1383，1437，1479，1545，1560 |
Table 2 4K mode of operation continuous pilot sub-carrier positions collection
| 0，15，69，162，177，216，270，351，375，414，429，480， 516，537，594，603，639，666，741，768，780，792，831， 852，882，921，966，1023，1050，1095，1146，1185，1200，1209， 1278，1344，1383，1437，1479，1545，1560，1575，1629，1722， 1737，1776，1830，1911，1935，1974，1989，2040，2076，2097， 2154，2163，2199，2226，2301，2328，2340，2352，2391，2412， 2442，2481，2526，2583，2610，2655，2706，2745，2760，2769， 2838，2904，2943，2997，3039，3105，3120 |
Table 3 8K mode of operation continuous pilot sub-carrier positions collection
| 0，15，69，162，177，216，270，351，375，414，429，480， 516，537，594，603，639，666，741，768，780，792，831，852， 882，921，966，1023，1050，1095，1146，1185，1200，1209， 1278，1344，1383，1437，1479，1545，1560，1575，1629，1722， 1737，1776，1830，1911，1935，1974，1989，2040，2076，2097， 2154，2163，2199，2226，2301，2328，2340，2352，2391，2412， 2442，2481，2526，2583，2610，2655，2706，2745，2760，2769， 2838，2904，2943，2997，3039，3105，3120，3135，3189，3282， 3297，3336，3390，3471，3495，3534，3549，3600，3636，3657 3714，3723，3759，3786，3861，3888，3900，3912，3951，3972， 4002，4041，4086，4143，4170，4215，4266，4305，4320，4329， 4398，4464，4503，4557，4599，4665，4680，4695，4749，4842， 4857，4896，4950，5031，5055，5094，5109，5160，5196，5217， 5274，5283，5319，5346，5421，5448，5460，5472，5511，5532， |
| 5562，5601，5646，5703，5730，5775，5826，5865，5880，5889， 5958，6024，6063，6117，6159，6225，6240 |
All continuous pilot are by pseudo-random binary sequence w
kThe reference sequences that provides is modulated.The continuous pilot unit is always launched on the power level of " promoting the back ", is modulated to accordingly
Re(C
m，k)＝4/3·(1-2·w
k)
Im (C
M, kIn the formula of)=0, m is the indication of OFDM symbol time, and k is the sub-carrier frequencies indication.
The TPS subcarrier is used to provide the parameter relevant with transmission plan, i.e. chnnel coding and modulation parameter and system information.For the 2K mode of operation, the TPS signaling is parallel transmission on 8 carrier waves; For the 4K mode of operation, the TPS signaling is parallel transmission on 16 carrier waves; For the 8K mode of operation, the TPS signaling is parallel transmission on 32 carrier waves.Each TPS subcarrier in the prosign transmits the information bit of identical differential coding.Table 4,5,6 has provided a kind of carrier position collection of TPS subcarrier.
The TPS unit of sub-carriers is launched on " promoting the back " power level.Each TPS subcarrier transmits identical information with the 2DBPSK modulation.2DBPSK when the beginning of each TPS piece by pseudo-random binary sequence w
kProvide consensus sequence to carry out initialization.
The carrier position collection of table 4 2K mode of operation TPS subcarrier
| 40，346，569，700，790，1155，1219，1469 |
The carrier position collection of table 5 4K mode of operation TPS subcarrier
| 40，346，569，700，790，1155，1219，1469，1600，1906，2129， 2260，2350，2715，2779，3029 |
The carrier position collection of table 6 8K mode of operation TPS subcarrier
| 40，346，569，700，790，1155，1219，1469，1600，1906，2129， 2260，2350，2715，2779，3029，3160，3466，3689，3820，3910， 4275，4339，4589，4720，5026，5249，5380，5470，5835，5899， 6149 |
Each OFDM symbol transmits a TPS bit, and each TPS piece (corresponding to an OFDM frame) is made up of 64 bits, comprising: 1 initialization bit, 16 synchronization bits, 34 information bits and 13 redundant bits that are used for error protection.For 34 information bits, can only use a part wherein, and with remainder as standby.As use 27, all the other 7 as standby, is changed to " 1010101 ".The corresponding reference symbol sequence w of TPS sub-carrier positions of each first symbol of OFDM frame
kBe used for the 2DBPSK modulation initialization of this position TPS sub-carrier signal.
TPS information is transmitted by table 7.First bit S of 2DPSK modulation
0It is an initialization bit.TPS initialization bit S
0From pseudo-random binary sequence w
kDraw.
1-16 bit among the TPS is a synchronization character, and every frame is got sw successively
0And sw
1, sw here
0Be 0011010111101110, sw
1Be 1100101000010001
The TPS error protection adopts that the input code length is 50, the output code length is 63, error correcting capability is binary system basis Bo Si-Cha Dehuli-Huo Kun lattice nurse (BCH) sign indicating number of 3.The sign indicating number generator polynomial is: g (x)=x
13+ x
12+ x
11+ x
10+ x
9+ x
8+ x
6+ x
3+ x+1
Table 7 TPS signaling information and form
| Bit number | Form | Purpose/content |
| S 0 | w k | 2DBPSK modulates initialization |
| S 1-S 16 | 0011010111101110， | Synchronization character |
| S 17-S 18 | See Table 8 | Mode of operation |
| S 19-S 21 | See Table 9 | Transmission mode |
| S 22-S 24 | See Table 10 | Non-layered single or layering HP code stream or the interior code rate of the mixed mode first via |
| S 25-S 27 | See Table 10 | Code rate in layering LP code stream or the mixed mode the second tunnel |
| S 28-S 29 | See Table 11 | Single or the layering HP code stream of non-layered or the mixed mode first via degree of depth that interweaves outward |
| S 30-S 31 | See Table 11 | Layering LP code stream or mixed mode the second tunnel degree of depth that interweaves outward |
| S 32-S 33 | See Table 12 | Single or mixed mode first via signal constellation (in digital modulation) |
| S 34-S 35 | See Table 12 | Mixed mode the second road signal constellation (in digital modulation) |
| S 36 | See Table 13 | The present frame blend modes of operation |
| S 37 | See Table 13 | The next frame blend modes of operation |
| S 38 | See Table 13 | Following frame blend modes of operation |
| S 39 | See Table 13 | Following frame blend modes of operation |
| S 40 | See Table 13 | Following frame blend modes of operation |
| S 41-S 43 | See Table 14 | The protection gap |
| S 44-S 50 | Be set to " 1010101 " | Reserve in the future |
| S 51-S 63 | BCH code | Error protection |
The signaling format of table 8 mode of operation
| Bit S 17-S 18 | Mode of operation |
| 00 | 2K |
| 01 | 4K |
| 10 | 8K |
| 11 | Standby |
The signaling format of table 9 transmission mode
| Bit S 19-S 21 | Transmission mode |
| 000 | Non-layered is single |
| 001 | Non-layered is mixed |
| 010 | Layering α=1 |
| 011 | Layering α=2 |
| 100 | Layering α=4 |
| 101 | Standby |
| 110 | Standby |
| 111 | Standby |
The signaling format of table 10 code check
| Bit S 22-S 24，S 25-S 27 | Code check |
| 000 | 1/2 convolution code |
| 001 | 2/3 convolution code |
| 010 | 3/4 convolution code |
| 011 | 5/6 convolution code |
| 100 | 7/8 convolution code |
| 101 | The 1/2turbo sign indicating number |
| 110 | Standby |
| 111 | Standby |
The signaling format of table 11 external interleaver interleave depth
| Bit S 28-S 29，S 30-S 31 | The convolutional deinterleaver parameter |
| 00 | 4 |
| 01 | 32 |
| 10 | 64 |
| 11 | 192 |
The signaling format of table 12 constellation possibility type
| Bit S 32-S 33，S 34-S 35 | The planisphere characteristic |
| 00 | DQPSK |
| 01 | QPSK |
| 10 | 16QAM |
| 11 | 64QAM |
Table 13 blend modes of operation signaling format
| Bit S36, S37, S38, S39, S40 | Blend modes of operation |
| 0 | The first via |
| 1 | The second the tunnel |
Table 14 protection signaling format at interval
| Bit S 41-8 43 | The protection spacing value |
| 000 | 1/32 |
| 001 | 1/16 |
| 010 | 1/8 |
| 011 | 1/4 |
| 100 | Standby |
| 101 | Standby |
| 110 | Standby |
| 111 | Standby |
Claims (5)
1. Coded Orthogonal Frequency Division Multiplexing (COFDM) transmission system that is suitable for DTB Digital Terrestrial Broadcasting, it is characterized in that: base-band digital modulation signal sample rate is 10MHz, ofdm signal Seize ACK message bandwidth is 7.62MHz;
One frame ofdm signal is made up of 64 OFDM symbols, and each OFDM symbol is that M the carrier signal of Ts formed by the duration, comprising N
1Number it is believed that work song carrier wave, N
2Individual mobile pilot sub-carrier, N
3Individual continuous pilot subcarrier and N
4Individual TPS subcarrier;
Symbol duration Ts comprises that the duration is that useful part and duration of Tu is Δ
TThe protection compartment, protection is inserted in before the useful part at interval;
Be that the sub-carrier number M of each OFDM symbol equals 1561, data-signal sub-carrier number N under 2048 the mode of operation at the IFFT block size
1Equal 1392, mobile pilot sub-carrier is counted N
2Equal 130, continuous pilot sub-carrier number N
3Equal 41, TPS sub-carrier number N
4Equal 8; Tu is 204.8 microseconds; For i OFDM symbol, mobile position set of pilot subcarriers S
iFor:
K=3 * (i mod4)+12p, p is 〉=0 integer, i ∈ [0,63], k ∈ [0,1560]
Be that the sub-carrier number M of each OFDM symbol equals 3121, data-signal sub-carrier number N under 4096 the mode of operation at the IFFT block size
1Equal 2784, mobile pilot sub-carrier is counted N
2Equal 260, continuous pilot sub-carrier number N
3Equal 81, TPS sub-carrier number N
4Equal 16; Tu is 409.6 microseconds; For i OFDM symbol, mobile position set of pilot subcarriers S
iFor:
K=3 * (i mod4)+12p, p is 〉=0 integer, i ∈ [0,63], k ∈ [0,3120]
Be that the sub-carrier number M of each OFDM symbol equals 6241, data-signal sub-carrier number N under 8192 the mode of operation at the IFFT block size
1Equal 5568, mobile pilot sub-carrier is counted N
2Equal 520, continuous pilot sub-carrier number N
3Equal 161, TPS sub-carrier number N
4Equal 32; Tu is 819.2 microseconds; For i OFDM symbol, mobile position set of pilot subcarriers S
iFor:
K=3 * (i mod4)+12p, p is 〉=0 integer, i ∈ [0,63], k ∈ [0,6240]
The position of continuous pilot subcarrier is about centre frequency position symmetry, and the continuous pilot sub-carrier positions of 64 OFDM symbols is identical with value in the OFDM transmission signal frame;
Continuous pilot and mobile pilot sub-carrier reference signal are obtained by a pseudo-random binary sequence, and this pseudo-random binary sequence also is used for the TPS subcarrier is carried out 2DPSK modulation initialization;
Each OFDM symbol transmits a TPS bit; each TPS subcarrier in the prosign transmits the information bit of identical differential coding; corresponding to an OFDM frame; each TPS piece is made up of 64 bits, comprises 1 initialization bit, 16 synchronization bits, 34 information bits and 13 redundant bits that are used for error protection.
2. Coded Orthogonal Frequency Division Multiplexing (COFDM) transmission system according to claim 1 is characterized in that: the modulation of all data cells is through normalization, and making average power level is 1; Continuous pilot, mobile pilot tone and TPS subcarrier are all launched on the power that promotes, and making average power level is 16/9.
3. Coded Orthogonal Frequency Division Multiplexing (COFDM) transmission system according to claim 1 is characterized in that: the connection multinomial that pseudo-random binary sequence generator is used is: x
13+ x
4+ x
3+ x+1 presets 11111111111, and the first output bit of this pseudo-random binary sequence is overlapped with first effective subcarrier, produces a new numerical value by this sequence on the carrier wave of each use.
4. Coded Orthogonal Frequency Division Multiplexing (COFDM) transmission system according to claim 1 is characterized in that: the 2nd～17 bit in the TPS piece is a synchronization character, and every frame gets 0011010111101110 and 1100101000010001 successively.
5. Coded Orthogonal Frequency Division Multiplexing (COFDM) transmission system according to claim 1; it is characterized in that: the TPS error protection adopts that the input code length is 50, the output code length is 63, error correcting capability is binary system basis Bo Si-Cha Dehuli-Huo Kun lattice nurse sign indicating number of 3, and a sign indicating number generator polynomial is: g (x)=x
13+ x
12+ x
11+ x
10+ x
9+ x
8+ x
6+ x
3+ x+1.
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|---|---|---|---|
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| Publication number | Priority date | Publication date | Assignee | Title |
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| FR2854290B1 (en) * | 2003-04-25 | 2005-08-26 | Thales Sa | METHOD OF DEMODULATING OFDM-TYPE SIGNALS IN THE PRESENCE OF STRONG CO-CHANNEL BROKERS |
| CN1635725B (en) * | 2003-12-31 | 2010-04-14 | 华为技术有限公司 | A method for implementing synchronization in OFDM system |
| KR100808462B1 (en) * | 2004-01-29 | 2008-03-07 | 포스데이타 주식회사 | Methods and apparatus for multi-carrier, multi-cell wireless communication networks |
| EP1712019B1 (en) | 2004-01-29 | 2014-01-15 | Neocific, Inc. | Methods and apparatus for overlaying multi-carrier and direct sequence spread spectrum signals in a broadband wireless communication system |
| CN100372238C (en) * | 2004-03-31 | 2008-02-27 | 清华大学 | Assembly structure of time-domain synchronous orthogonal frequency-division multiplex receiver |
| DE102004052899B4 (en) | 2004-11-02 | 2011-08-18 | Lantiq Deutschland GmbH, 85579 | Both on sporadic as well as on continuous data communication oriented OFDM transmission method for a WLAN |
| CN1992690B (en) * | 2005-12-26 | 2010-05-05 | 华为技术有限公司 | Emitting method of pilot data, base station controller, channel evaluation method and apparatus |
| CN1996978B (en) * | 2005-12-28 | 2012-05-23 | 华为技术有限公司 | Transmission method and device for piolet frequency data and its wireless network controller and system |
| TWI424765B (en) * | 2006-08-18 | 2014-01-21 | Lg Electronics Inc | A method of transmitting signals for providing broadcast and multicast service (bcmcs) in a wireless communications system |
| CN101202727B (en) * | 2006-12-14 | 2013-03-13 | 北京三星通信技术研究有限公司 | Method for constructing sub carrier wave interference self-counteract guide symbol |
| EP2248314A1 (en) | 2008-02-25 | 2010-11-10 | Nxp B.V. | Arrangement and approach for time slot index synchronization for wireless communications |
| US20100124292A1 (en) * | 2008-11-20 | 2010-05-20 | Advanced Micro Devices, Inc. | Method and System for Receiver Synchronization |
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