CN1613221A - Method and device for constructing TD-LAS system - Google Patents
Method and device for constructing TD-LAS system Download PDFInfo
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- CN1613221A CN1613221A CN02827048.7A CN02827048A CN1613221A CN 1613221 A CN1613221 A CN 1613221A CN 02827048 A CN02827048 A CN 02827048A CN 1613221 A CN1613221 A CN 1613221A
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- 239000006125 LAS system Substances 0.000 title abstract description 5
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2662—Arrangements for Wireless System Synchronisation
- H04B7/2668—Arrangements for Wireless Code-Division Multiple Access [CDMA] System Synchronisation
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Abstract
A method of constructing a TD-LAS system, comprising: adopting LAS code as frequency spread spectrum multiple address code; adopting LA codes and LS codes to carry out networking between cells; the sub-frame of the radio frame structure is composed of LA codes and LS codes; the access pulse of the uplink synchronization is formed based on the LS code; the downlink synchronization subframe is composed of an LA code and an LS code. The invention also provides a device for constructing the TD-LAS system, which comprises a transmitter and a receiver, wherein the transmitter at least comprises a spread spectrum device which adopts the LAS code as a spread spectrum multiple access code; the receiver at least comprises a de-spreading device which is a spread spectrum multiple access code based on an LAS code; information sent by an information source is spread by a spread spectrum device which at least adopts an LAS code as a spread spectrum multiple access code and then is transmitted to a channel; the information received by the sink has been despread at least by despreading means which are based on the LAS code as a spread spectrum multiple access code.
Description
A kind of method and device technical field of structure TD-LAS systems
Concretely it is a kind of method and device of structure TD-LAS systems the present invention relates to technical field of telecommunications.
Background technology
Mobile communication technology passes through the development of more than ten years, from the FDMA technologies and the TDMA technologies of the second generation of the first generation, has developed into the CDMA technology of the third generation.WCDMA, IS-2000 and TD-SCDMA in current 3G standard have in common that its most basic CDMA technology is to grow up in late nineteen eighties on the Qualcomm IS-95 proposed technical foundation, therefore, WCDMA, IS- 2000 and TD-SCDMA can merger among of a sort " tradition CDMA ".
The CDMA technology that traditional CDMA mobile communication system is used is with long pseudo noise code (PN) and short orthogonal code（Wal sh or Golden sequences）Shy J goes out.The message capacity and the size of spectrum efficiency of multi-user wireless communication system based on CDMA (Code Divi s ion Mul t iple Access) technology, the correlation properties of spread spectrum multiple access code with being used have very close relationship, and correlation properties associated therewith include the auto-correlation and cross correlation of spread spectrum multiple access code.In conventional CDMA system, because the design of its address code is limited by theoretical Welch circle, under mobile wireless propagation conditions, it there is serious intersymbol interference (Inter Symbol Interference), multi-access inference (Mul t iple Access Interference) and adjacent area interference (Adjacent Cel l Interference), and fatal " far-near effect "（Suppress weak effect）, for that purpose it is necessary to using fast power control technology, make the signal of each user break unanimous on the whole in receiving terminal, can tolerate so that interference level is relative.Therefore, traditional CDMA is interference-limited（Interference Limi ted) system, i.e. its power system capacity is limited to the size of the dry outstanding level in whole cdma system.
CDMA systems use channeling for one networking plan, i.e., different cells are using identical frequency
Rate.In order to distinguish different cells, and adjacent area interference is reduced, it is necessary to carry out networking using code space, in traditional CDMA, the Networking Design between cell is carried out using the different skews of long PN codes.
The design of wireless frame structure depend heavilys on the basic fundamental of physical layer, and the frame structure of conventional CDMA system is designed based on PN codes and Wal sh codes.
Radio receiving-transmitting unit is the element of system, the frequency specification requirement being wirelessly transferred to ensure system to disclosure satisfy that in normal work, and baseband filter is a crucial technology.In traditional CDMA systems, the baseband filter of use is characteristic and and design based on PN codes and l sh codes；It is based on supporting the base band shaping filter of speech business and low dimensional modulation mode such as BPSK, QPS/DQPSK, GMS design to be difficult to the high-speed data service for supporting future mobile communication system.
For effectively transmitting high speed data in wireless environments, Turbo code channel coding technology is a crucial technology.In conventional CDMA system, generally employ PCCC (paral lel concatenated convolut ional code) and SCCC (ser ia l concatenated convolut ional code) Turbo codings, its corresponding decoding algorithm is software- redundancy Iterated MAP decoding algorithm, LOG-MAP (Logari thm-Maximum A Pos ter ior) simplifies algorithm such as MAX- LOG- MAP, SOVA (Soft-In-Sof t-Out Vi terbi Algori thm) etc., all it is a kind of operand very big two-way algorithm, correspondence decoder architecture is complicated, cost is high, processing speed is slow, time delay is larger.
The following GSM towards IP operation, high efficiency and reliability to wireless block data transmission propose very high requirement, and HARQ (Hybrid Automat ic Repeat reques t) is a crucial technology.Existing 3G systems mostly realize physical layer error control using RCPT/HARQ (Rate Compat ible Punctured Turbo code) technology based on PCCC schemes.Realizing for I type systems is relatively simple, but in the case of identical QoS (Qual i ty of Service) is ensured, system effectiveness is substantially not so good as II type systems.In the various methods of II type systems, Chase combined methods can not provide effective throughput of system in the high channel bit error rate, and utilize IR (Incremental Redundancy)
Method improves systematic function under severe channel circumstance again must be to increase the complexity and cost of system as cost.
Transmitting diversity technology can effectively improve the efficiency of system, improve performance of the system under fading channel.In traditional CDMA systems, the transmitting diversity technologies such as TSTD (Time Swi tched Transmi t ter Divers i ty), STTD (Space Time Transmi t ter Divers i ty), ■ OTD (Orthogonal Transmi t ter Divers i ty), STD (Selective Transmitter Diversity) are employed.Preceding 3 be all the pattern of open loop, STD then uses the pattern of semi-loop, upstream data that i.e. transmitting diversity of base station end need to be sent according to mobile station selects descending antenna, and due to being to carry out channel estimation and demodulation by continuous pilot signal, so, base station it is also required to provide descending indicator, notify mobile station which pilot channel should go demodulation with.There is following defect in existing emission diversity method mentioned above：For example when the emission diversity method using open loop, the improvement to system receptivity is less desirable, and precision is not high enough, very sensitive to environment；And above-mentioned STD semi-loop emission diversity method is used, realize more complicated, due to needing to carry out channel estimation and demodulation by continuous pilot signal, descending indicator is then provided accordingly, implement more complicated, be of limited application.
Synchronous CDMA system requires that each user keeps synchronous when reaching base station, therefore uplink synchronous is a crucial technology.In conventional CDMA system, particularly synchronous CDMA system（Such as TD- SCDMA), for mobile station, the premise for realizing system access is to complete down-going synchronous.In traditional CDMA systems, the realization of down-going synchronous is related by the slip to PN codes, searches for all possible PN code phases to complete synchronization acquistion.
In conventional CDMA system, quick power control techniques are employed, to solve fatal " remote-near effect ".The forward power that power control frequencies are 1600HZ is for example employed in wcdma to control.
Although power control rate is improved, simulation result shows, this quick Power Control is to the fast-fading effect in tracking wireless propagation environment nor fairly obvious.And due to the nonopiate characteristic of skew between the spreading code of each user, typical wireless multi-path communication environments can not be tackled, therefore " the far-near effect " brought produces no small influence to the power control strategy and effect of whole multiuser CDMA systems.
In conventional CDMA system, its networking plan based on PN codes and Wal sh codes determines the presence of inter-cell interference.In order to enable a system to normal work, the soft hand-off of complexity is employed.
In conventional CDMA system, the networking plan of PN codes and Wa l sh codes make use of.Due to the difference of the biography letter rate required by speech and data service（Spread more than speech using long code, using short code spread spectrum more than data）, during code assignment, once the code word on trunk is allocated to MS, the code word in its respective branches will not be reusable.The fdd mode of WCDMA system just uses this dynamic 0VSF allocation strategies.Based on the design philosophy of interference white noise, the distribution of each cell or sector to Wa l sh codes is more random better.
Dynamic channel allocation is divided at a slow speed and fast DCA.CDMA2000 systems do not use dynamic channel allocating technology in order, because it is to realize networking using the skew of PN codes, and it can only regularly distribute the configuration of PN codes skew in the network planning for each cell；The tdd mode of WCDMA system employs dynamic（At a slow speed and quickly）Channel allocation technique.
For signal fadeout and distortion of the compensation mobile system in communication channel, it is necessary to use channel estimation technique.In fading channel, the order of accuarcy of channel estimation directly affects systematic function quality.In traditional cdma system, using CP continuous pilot channel estimation methods and dedicated pilot (channel) method of estimation.Using the channel estimation methods of CP continuous pilot, it is necessary to take a special channel, thus to increase the transmission power of emitter, thus CP continuous pilot is served only for the downlink communication of synchronous CDMA system（From base station to mobile station）In, and dedicated pilot (channel) method of estimation, influenceed larger by mobile station translational speed, when at a high speed
The content of the invention
It is an object of the invention to provide a kind of method and device of structure TD-LAS systems；It is based on LAS-CDMA core technologies, towards the GSM of " full IP ", the auto-correlation and cross correlation of LAS codes form " the zero interference window " of uniqueness, and this is the characteristics of spread spectrum multiple access code that other conventional CDMA communication systems are used is not available.The present invention reduces the interference between neighbor cell to solve, and improves power system capacity and spectrum efficiency；Can effectively it support in time division duplex（TDD) the big region overlay under working method, while also flexible dynamically distributes can be carried out to the rate ratio and type of service of system up-downgoing business；There can be more preferable amplitude-frequency response characteristic, have preferable robustness to sample time error（Robus tness), not only make to use BPSK, QPS/DQPSK, the digital baseband signal wave distortion of the low dimensional modulation mode such as GMSK is smaller, and for using 8 PSK, 16PSK, 32PSK, 16QAM, 32QAM, 64QAM, the digital baseband signal wave distortion of the higher-dimension modulation system such as 64 PSK is smaller, digital mobile communication system can be supported to use multidimensional simplex mode, such as 8 PSK, 16PSK, 32PSK, 16QAM, 32QAM, 64QAM, 64 PSK etc. realize the high speed data transfer of spectral efficient, and for disturbing smaller between adjacent channel in system, disturb also smaller simultaneously for other communication systems, GSM especially high-speed mobile communication system spectrum efficiency and power system capacity can be improved, so as to be laid the foundation to set up Large Copacity and the radio digital communication system of high number data transmission service can be provided.
The corresponding encoder and decoder structure of the present invention is simple, with relatively low complexity, processing speed soon, time delay it is smaller, higher channel coding gain can be obtained for high coding efficiency and short frame, in actual applications to correct random error and burst error simultaneously, thus it is particularly suitable for use in the complicated channel circumstance of interference；Volume, decoding equipment are simplified, decoding processing speed is accelerated, thus the complexity that system is realized is reduced while guarantee systematic function.Preferable decoding performance is obtained while algorithm complex is not increased, and further types of subcode can be supported.TP- ARQ systems are further made to obtain high coding gain as far as possible and system effectiveness with alap system complexity.
The present invention can improve emission diversity performance, and resistance decline increases the accuracy of reverse sync.Present invention reduces the time of synchronization acquistion, the performance of cell searching and Target cell search is improved.
The present invention is used to overcome " the far-near effect " in conventional CDMA system.More thorough and more rational power adjustment can be carried out, the characteristic that further power consumption of reduction mobile phone and the few mobile phones of the transmission power , Minus of base station, increases the stand-by time of mobile phone, this will more embody the technology " people-oriented, using environment as this ".
The present invention can substantially reduce adjacent area interference, reduce the interference to adjacent cell or sector.So that different districts are possible to use different time slot distribution patterns.The transmission power of signal can be saved, influence of the deep fade to signal amplitude and phase can be effectively overcome, it is ensured that the modulation system of more higher-dimension is applied under high-speed mobile environment.The performance of simultaneity factor is influenceed smaller by the movement velocity of mobile station, influenceed smaller by the rapid fading that Doppler frequency-shift is caused, thus can effectively overcome influence of the deep fade that high-speed mobile is brought to signal amplitude and phase, at the same using such a method can ensure under high-speed mobile environment using 8 PSK, 16PSK, 32PSK, 1 6QAM, 32QAM, 64QAM 64PSK these more higher-dimensions modulation system.
The technical scheme is that：
A kind of method of structure TD-LAS systems, including：LAS codes are used for spread spectrum multiple access code；The networking between cell is carried out using LA codes and LS codes；The subframe of wireless frame structure is made up of LA codes and LS codes；The access pulse of uplink synchronous is constituted based on LS codes；Sub-frame of downlink synchronization is made up of LA codes and LS codes.
The networking that described use LA codes and LS codes are carried out between cell includes：Using the code word of same spread length, spread for high-rate service using segmentation；Different LS codes group-wise zero correlation windows it is of different sizes, it is better to the distribution more rule of LS codes in each cell or sector, as far as possible using the code character of larger zero correlation window, reduce interference to adjacent cell or sector.
The access pulse of described uplink synchronous, which is based on LS codes composition, to be included：Used in TD- LAS systems
Spreading code LS codes have zero window property of cross-correlation, so the code sequence of the up all users of system requirements reaches base station simultaneously, therefore, one standard time is set at the uplink synchronous channel receiver of base station, and the blunt values of default uplink synchronous success door P, when the gap of time and standard time that uplink synchronous pulse reaches base station are less than default uplink synchronous success threshold value, then it is assumed that uplink synchronous success；On the contrary, then it is assumed that uplink synchronous is still failed, uplink synchronous process need to proceed, and up bit synchronization and frame synchronization are completed simultaneously.
Described sub-frame of downlink synchronization by LA codes and LS codes constitute including：LS+LA code characters have excellent auto-correlation and cross correlation, are used directly for synchronization acquistion；Using the matched filter matched with a certain particular channel, the set of whole LS+LA code characters is may search for, cell searching and Target cell search is carried out；According to the characteristics of LS+LA codes, to same LS codes sequence, the different synchronizing sequences that different LA pulse code methods are realized can need not increase hardware resource with parallel search.
Described method also includes：Encoded using TPC codes.
Described method also includes：Decoded using TPC codes.Described method also includes：Encoded using TPC codes, row decoding is entered using the TPC iterative decodings based on subcode syndrome.
Described method also includes：Error Control is carried out using the TP- ARQ encoded based on TPC.
Described method also includes：Encoded using TPC codes, row decoding is entered using the TPC iterative decodings based on subcode syndrome, Error Control is carried out using the TP- ARQ encoded based on TPC.
Described method also includes：It is filtered using finite impulse response baseband filter.
Described method also includes：Encoded using TPC codes, row decoding is entered using the TPC iterative decodings based on subcode syndrome, Error Control is carried out using the TP- ARQ encoded based on TPC, is filtered using finite impulse response baseband filter.
Described method also includes：Using STSTD (Smart Select ive Transmi tter Divers i ty) transmitting diversity.
Described method also includes：Encoded using TPC codes, row decoding is entered using the TPC iterative decodings based on subcode syndrome, Error Control is carried out using the TP-ARQ encoded based on TPC, is filtered using finite impulse response baseband filter, using STSTD transmitting diversities.
Described method also includes：BPSK can not only be used, the low dimensional modulation mode such as QPSK/DQPSK, GMSK, and can be modulated using multidimensional simplex mode, described multidimensional simplex mode can be 8 PSK, 16PSK, 32PSK, 16QAM, 32QAM, 64QAM, 64 PSK etc..
Described method also includes：Encoded using TPC codes, row decoding is entered using the TPC iterative decodings based on subcode syndrome, Error Control is carried out using the TP-ARQ encoded based on TPC, it is filtered using finite impulse response baseband filter, using STSTD transmitting diversities, BPSK can not only be used, QPSK/DQPSK, the low dimensional modulation mode such as GMSK, and can be modulated using multidimensional simplex mode, described multidimensional simplex mode can be 8 PSK, 16PSK, 32PSK, 16QAM, 32QAM, 64QAM, 64 PS etc..
Described method also includes：Uplink synchronous channel receiving terminal is equipped with corresponding matched filter and carries out computing.
Described method also includes：Encoded using TPC codes, row decoding is entered using the TPC iterative decodings based on subcode syndrome, Error Control is carried out using the TP- ARQ encoded based on TPC, it is filtered using finite impulse response baseband filter, using STSTD transmitting diversities, BPSK can not only be used, QPSK/DQPSK, the ^ such as GMSK tie up modulation system, and can be modulated using multidimensional simplex mode, described multidimensional simplex mode can be 8 PSK, 16PSK, 32PSK, 16QAM, 32QAM, 64QAM, 64 PSK etc., uplink synchronous channel receiving terminal is equipped with corresponding matched filter and carries out computing.
Described method also includes：Adjusted using power.
Described method also includes：Encoded using TPC codes, row decoding is entered using the TPC iterative decodings based on subcode syndrome, Error Control is carried out using the TP-ARQ encoded based on TPC, it is filtered using finite impulse response baseband filter, using STSTD transmitting diversities, BPSK can not only be used, QPSK/DQPSK, the low dimensional modulation mode such as GMSK, and can be modulated using multidimensional simplex mode, described multidimensional simplex mode can be 8 PSK, 16PSK, 32PSK, 16QAM, 32QAM, 64QAM, 64 PSK etc., uplink synchronous channel receiving terminal is equipped with corresponding matched filter and carries out computing, adjusted using power.
Described method also includes：Switched over using direct-cut operation.Described direct-cut operation includes：In TD-LAS systems, each cell or sector send the LA code information containing each neighbor cell or sector in the continuous pilot signal with identical LS codes and different LA codes, MS；Only same cell or sector keep communication to MS, when service feature is reduced to a certain extent, MS will open another down-going synchronous receiver, and poll measures other cells or the downlink synchronous signal intensity of sector, and calculate synchronous time deviation between different districts;MS is received after the switching command that network-side is sent, the communication with current area or sector will be interrupted immediately, directly uplink service information is sent using time deviation measured value to new cell or sector and downstream communications link is set up, and BS carries out the tracking and adjustment of uplink synchronous by uplink pilot signal；If uplink service information can't pass CRC check in a period of time, MS will stop the communication of uplink service, and uplink synchronous pulse is sent in idle access slot, uplink synchronous is set up with new cell again；Direct-cut operation is not seamless switching.
Described method also includes：Encoded using TPC codes, row decoding is entered using the TPC iterative decodings based on subcode syndrome, Error Control is carried out using the TP-ARQ encoded based on TPC, it is filtered using finite impulse response baseband filter, using STSTD transmitting diversities, BPSK can not only be used, QPSK/DQPSK, the low dimensional modulation mode such as GMSK, and can be modulated using multidimensional simplex mode, described multidimensional simplex mode can for 8 PSK, 16PSK, 32PSK, 16QAM, 32QAM, 64QAM,
64 PSK etc., uplink synchronous channel receiving terminal is equipped with corresponding matched filter and carries out computing, is adjusted, is switched over using direct-cut operation using power.
Described method also includes：Channel resource allocation is carried out using dynamic channel allocation.
Described method also includes：Encoded using TPC codes, row decoding is entered using the TPC iterative decodings based on subcode syndrome, Error Control is carried out using the TP-ARQ encoded based on TPC, it is filtered using finite impulse response baseband filter, using STSTD transmitting diversities, BPSK can not only be used, QPS/DQPSK, the low dimensional modulation mode such as GMSK, and can be modulated using multidimensional simplex mode, described multidimensional simplex mode can be 8 PSK, 16PSK, 32PSK, 16QAM, 32QAM, 64QAM, 64 PSK etc., uplink synchronous channel receiving terminal is equipped with corresponding matched filter and carries out computing, adjusted using power, switched over using direct-cut operation, channel resource allocation is carried out using dynamic channel allocation.
Described method, it is characterised in that it also includes：Using binary channels channel estimation.
Described method also includes：Encoded using TPC codes, row decoding is entered using the TPC iterative decodings based on subcode syndrome, Error Control is carried out using the TP-ARQ encoded based on TPC, it is filtered using finite impulse response baseband filter, using STSTD transmitting diversities, BPSK can not only be used, QPSK/DQPSK, the low dimensional modulation mode such as GMSK, and can be modulated using multidimensional simplex mode, described multidimensional simplex mode can be 8 PSK, 16PSK, 32PSK, 16QAM, 32QAM, 64QAM, 64 PSK etc., uplink synchronous channel receiving terminal is equipped with corresponding matched filter and carries out computing, adjusted using power, switched over using direct-cut operation, channel resource allocation is carried out using dynamic channel allocation, using binary channels channel estimation.
Present invention also offers a kind of device of structure TD-LAS systems, it is made up of transmitter and receiver, wherein described emitter at least includes the spread spectrum device for using LAS codes for spread spectrum multiple access code；Described receiver is at least included based on the despreading device that LAS codes are spread spectrum multiple access code；
The information that information source is sent is at least through using LAS codes to launch after the spread spectrum device spread spectrum of spread spectrum multiple access code
To channel；The despreading of the information that the stay of two nights is received at least by being carried out based on the despreading device that LAS codes are spread spectrum multiple access code.
Described emitter may also include radio frames framing apparatus；Described receiver may also include radio frames and remove frame device；Wherein the subframe of wireless frame structure is made up of LA codes and LS codes；
The information that information source is sent can be transmitted into channel through using LAS codes for the spread spectrum device spread spectrum of spread spectrum multiple access code, after radio frames framing apparatus framing；The stay of two nights receive information can by radio frames go frame device carry out go frame, based on LAS codes be spread spectrum multiple access code despreading device progress despreading.
Described emitter may also include radio frames framing apparatus, finite impulse response baseband filter；Described receiver may also include radio frames and remove frame device, matched filter；Wherein the subframe of wireless frame structure is made up of LA codes and LS codes；
The information that information source is sent can be through using LAS codes to be transmitted into channel after being filtered for spread spectrum device spread spectrum, radio frames framing apparatus framing, the finite impulse response baseband filter of spread spectrum multiple access code；What the information that the stay of two nights is received can go that frame device carries out by the filtering of matched filter, radio frames go frame, based on LAS codes be spread spectrum multiple access code despreading device progress despreading.
Described emitter may also include radio frames framing apparatus, finite impulse response baseband filter, TPC encoders；Described receiver may also include radio frames and remove frame device, matched filter, TPC decoders；Wherein the subframe of wireless frame structure is made up of L A codes and LS codes；
The information that information source is sent can encode through TPC encoders, use LAS codes to be transmitted into channel after being filtered for spread spectrum device spread spectrum, radio frames framing apparatus framing, the finite impulse response baseband filter of spread spectrum multiple access code；What the information that the stay of two nights is received can go that frame device carries out by the filtering of matched filter, radio frames go frame, based on LAS codes be spread spectrum multiple access code despreading device progress despreading, the decoding of TPC decoders.
Described emitter may also include radio frames framing apparatus, finite impulse response baseband filter, TPC encoders；Described receiver may also include radio frames and remove frame device, matched filter, based on subcode companion
With the TPC iterative decoders of formula；Wherein the subframe of wireless frame structure is made up of LA codes and LS codes；The information that information source is sent can encode through TPC encoders, use LAS codes to be transmitted into channel after being filtered for spread spectrum device spread spectrum, radio frames framing apparatus framing, the finite impulse response baseband filter of spread spectrum multiple access code；What the information that the stay of two nights is received can go that frame device carries out by the filtering of matched filter, radio frames go frame, based on LAS codes be spread spectrum multiple access code despreading device progress despreading, the decoding of TPC iterative decoders based on subcode syndrome.
Described emitter may also include radio frames framing apparatus, finite impulse response baseband filter, TPC encoders, modulator；Described receiver may also include radio frames and remove frame device, matched filter, TPC iterative decoders, demodulator based on subcode syndrome；Wherein the subframe of wireless frame structure is made up of LA codes and LS codes；
The information that information source is sent can through TPC encoders coding, the modulation of modulator, use LAS codes for spread spectrum multiple access code spread spectrum device spread spectrum, radio frames framing apparatus framing, finite impulse response baseband filter filter after be transmitted into channel；What the information that the stay of two nights is received can go that frame device carries out by the filtering of matched filter, radio frames go frame, based on LAS codes be spread spectrum multiple access code despreading device progress despreading, the demodulation of demodulator corresponding to multidimensional simplex mode, the decoding of TPC iterative decoders based on subcode syndrome.
Described emitter may also include radio frames framing apparatus, finite impulse response baseband filter, TPC encoders, the modulator for being applicable to multidimensional simplex mode, CRC check device, harq controller；Described receiver may also include radio frames and remove frame device, matched filter, the TPC iterative decoders based on subcode syndrome, demodulator, CRC check device；Wherein the subframe of wireless frame structure is made up of LA codes and LS codes；
The information that information source is sent can through the verification of CRC check device, TPC encoders coding, the modulation of modulator, use LAS codes for spread spectrum multiple access code spread spectrum device spread spectrum, radio frames framing apparatus framing, finite impulse response baseband filter filter after be transmitted into channel；The information that the stay of two nights is received can pass through the filter of matched filter
What ripple, radio frames went that frame device carries out go frame, based on LAS codes be spread spectrum multiple access code despreading device progress despreading, the demodulation of demodulator, the decoding of TPC iterative decoders based on subcode syndrome, the verification of CRC check device；The CRC check device of receiver can feed back HARQ to harq controller to carry out the re-transmission of Error Control and originator.
Described emitter may also include radio frames framing apparatus, finite impulse response baseband filter, TPC encoders, modulator, CRC check device, harq controller, sychronisation；Described receiver may also include radio frames and remove frame device, matched filter, the TPC iterative decoders based on subcode syndrome, demodulator, CRC schools inspection device, sychronisation；Wherein the subframe of wireless frame structure is made up of LA codes and LS codes；The information that information source is sent can through the verification of CRC check device, TPC encoders coding, the modulation of modulator, use LAS codes to be filtered for spread spectrum device spread spectrum, radio frames framing apparatus framing, the finite impulse response baseband filter of spread spectrum multiple access code, be transmitted into channel after the synchronization of sychronisation；What the information that the stay of two nights is received can go that frame device carries out by the synchronization of sychronisation, the filtering of matched filter, radio frames go frame, it is the despreading of despreading device progress of spread spectrum multiple access code, the demodulation of demodulator, decoding, the verification of CRC check device of TPC iterative decoders based on subcode syndrome based on LAS codes；The CRC check device of receiver can feed back HARQ to harq controller to carry out the re-transmission of Error Control and originator.
Described emitter may also include radio frames framing apparatus, finite impulse response baseband filter, TPC encoders, modulator, CRC check device, harq controller, sychronisation, STSTD transmission diversity apparatus；Described receiver may also include radio frames and go frame device, matched filter, the TPC iterative decoders based on subcode syndrome, demodulator, CRC check device, sychronisation, STSTD to receive diversity apparatus；Wherein the subframe of wireless frame structure is made up of L A codes and LS codes；
The information that information source is sent can through the verification of CRC check device, TPC encoders coding, the modulation of modulator, use LAS codes after the spread spectrum device spread spectrum of spread spectrum multiple access code, the filtering of radio frames framing apparatus framing, finite impulse response baseband filter, the transmitting diversity of STSTD transmission diversity apparatus, the synchronization of sychronisation
It is transmitted into channel；What the information that the stay of two nights is received can go that frame device carries out by the synchronization of sychronisation, STSTD receptions diversity, the filtering of matched filter, the radio frames for receiving diversity apparatus go frame, based on the reception diversity that LAS codes are spread spectrum multiple access yard, the despreading of despreading device progress, the demodulation of demodulator, the decoding of TPC iterative decoders based on subcode syndrome, the verification of CRC check device；The CRC check device of receiver can feed back HARQ to harq controller to carry out the re-transmission of Error Control and originator.Described emitter may also include radio frames framing apparatus, finite impulse response baseband filter, TPC encoders, modulator, CRC check device, harq controller, sychronisation, STSTD transmission diversity apparatus, power adjustment apparatus；Described receiver may also include radio frames and go frame device, matched filter, the TPC iterative decoders based on subcode syndrome, demodulator, CRC check device, sychronisation, STSTD to receive diversity apparatus；Wherein the subframe of wireless frame structure is made up of LA codes and LS codes；
The information that information source is sent can through the verification of CRC check device, TPC encoders coding, the modulation of modulator, use LAS codes for spread spectrum multiple access code spread spectrum device spread spectrum, the filtering of radio frames framing apparatus framing, finite impulse response baseband filter, the transmitting diversity of STSTD transmission diversity apparatus, power adjustment apparatus power adjust, power adjust after be transmitted into channel；What the information that the stay of two nights is received can go that frame device carries out by the synchronization of sychronisation, STSTD receptions diversity, the filtering of matched filter, the radio frames for receiving diversity apparatus go frame, based on the reception diversity that LAS codes are spread spectrum multiple access yard, the despreading of despreading device progress, the demodulation of demodulator, the decoding of TPC iterative decoders based on subcode syndrome, the verification of CRC check device；The CRC check device of receiver can feed back HARQ to harq controller to carry out the re-transmission of Error Control and originator.
Beneficial effects of the present invention：
The invention provides a kind of method and device of structure TD-LAS systems；It is that the auto-correlation and cross correlation of LAS codes form " the zero interference window " of uniqueness, and this is the spread spectrum multiple access that other conventional CDMA communication systems are used based on LAS-CDMA core technologies, towards the GSM of " full IP "
The characteristics of code is not available.The interference between neighbor cell greatly reduces in the present invention, improves power system capacity and spectrum efficiency；Can effectively it support in time division duplex（TDD) the big region overlay under working method, while also flexible dynamically distributes can be carried out to the rate ratio and type of service of system up-downgoing business；There can be more preferable amplitude-frequency response characteristic, there is preferable robustness (robus tness) to sample time error, not only make to use BPSK, QPSK/DQPSK, the digital baseband signal wave distortion of the low dimensional modulation mode such as GMSK is smaller, and for using 8 PSK, 16PSK, 32PSK, 16QAM, 32QAM, 64QAM, the digital baseband signal wave distortion of the higher-dimension modulation system such as 64 PSK is smaller, digital mobile communication system can be supported to use multidimensional simplex mode, such as 8 PSK, 16PSK, 32PSK, 16QAM, 32QAM, 64QAM, 64 PSK etc. realize the high speed data transfer of spectral efficient, and for disturbing smaller between adjacent channel in system, disturb also smaller simultaneously for other communication systems, GSM especially high-speed mobile communication system spectrum efficiency and power system capacity can be improved, so as to be laid the foundation to set up Large Copacity and the radio digital communication system of high number data transmission service can be provided；
The corresponding encoder and decoder structure of the present invention is simple, with relatively low complexity, processing speed soon, time delay it is smaller, higher channel coding gain can be obtained for high coding efficiency and short frame, in actual applications to correct random error and burst error simultaneously, thus it is particularly suitable for use in the complicated channel circumstance of interference；Volume, decoding equipment are simplified, decoding processing speed is accelerated, thus the complexity that system is realized is reduced while guarantee systematic function.Preferable decoding performance is obtained while algorithm complex is not increased, and further types of subcode can be supported.TP- ARQ systems are further made to obtain high coding gain as far as possible and system effectiveness with alap system complexity.
The present invention can also improve emission diversity performance well, it is possible to resistance decline well, increase the accuracy of reverse sync.Present invention reduces the time of synchronization acquistion, the performance of cell searching and Target cell search is improved.
The present invention is not present " far-near effect " in conventional CDMA system.It is therefore possible to use power
Adjustment technology, these technologies both include the power pre-distribution scheme that can go out according to known geographic environment distributed intelligence institute ^ Defeat, also include that the dynamic power adjustment that real-time user power distribution needs and carried out can be occupied, and the dynamic range of the power adjustment carried out to user, will be apparently higher than conventional CDMA system（" dynamic range " mentioned here is dramatically increased, and relies on to reduction " power needed for minimum " index to complete）.If tradition CDMA reduces transmission power due to that can carry out a range of Power Control, and if being referred to as " environmental protection " mobile phone, LAS-CDMA technologies are due to that can carry out more thorough and more rational power adjustment, further reduce the transmission power of mobile phone and base station, reduce the power consumption of mobile phone, the stand-by time of increase mobile phone, the characteristic that this will more embody the technology " people-oriented, using environment as this ".
The present invention greatly reduces adjacent area interference.Therefore, relatively simple hard-switching technology is employed.Reduce the interference to adjacent cell or sector.So that different districts are possible to use different time slot distribution patterns.The transmission power of signal can be saved, influence of the deep fade to signal amplitude and phase can be effectively overcome, it is ensured that the advantages of modulation system of more higher-dimension is applied under high-speed mobile environment.Now, the performance of system is influenceed smaller by the movement velocity of mobile station, influenceed smaller by the rapid fading that Doppler frequency-shift is caused, thus can effectively overcome influence of the deep fade that high-speed mobile is brought to signal amplitude and phase, at the same using such a method can ensure under high-speed mobile environment using 8 PSK, 16PSK, 32PSK, 16QAM, 32QAM, 64QAM, 64 PSK these more higher-dimensions modulation system.
Brief description of the drawings
Fig. 1 is LAS code schematic diagrams；
Fig. 1 is TD- LAS frame assumption diagrams；
Fig. 3 is the structured flowchart of apparatus of the present invention emitter；
Fig. 4 is the structured flowchart of apparatus of the present invention receiver.
Embodiment
The proposition of TD-LAS systems is based on a brand-new CDMA technology --- LAS-CDMA.Exactly because such technological disparity fundamentally, TD-LAS systems possess many technical characterstics for being different from tradition CDMA.TD- LAS systems are that, based on LAS-CDMA core technologies, towards the GSM of " full IP ", therefore the embodiment of the present invention is as follows：
The CDMA technology that traditional CDMA mobile communication system is used is with long pseudo noise code (PN) and short orthogonal code（Wal sh or Golden sequences）Based on.Such as Fig. 1, shown in Fig. 2：The present invention is to use LAS codes for spread spectrum multiple access code；The networking between cell is carried out using LA codes and LS codes；The subframe of wireless frame structure is made up of LA codes and LS codes；The access pulse of uplink synchronous is constituted based on LS codes；Sub-frame of downlink synchronization is made up of LA codes and LS codes.
The present invention is that, based on LAS-CDMA technologies, LAS-CDMA technologies are based on LAS codes, and LAS codes are made up of LA codes and LS codes.The message capacity and the size of spectrum efficiency of multi-user wireless communication system based on CDMA (Code Divi s ion Mul t iple Access) technology, the correlation properties of spread spectrum multiple access code with being used have very close relationship, and correlation properties associated therewith include the auto-correlation and cross correlation of spread spectrum multiple access code.The auto-correlation and cross correlation of LAS codes form " the zero interference window " of uniqueness, and this is the characteristics of spread spectrum multiple access code that other conventional CDMA communication systems are used is not available.In conventional CDMA system, because the design of its address code is limited by theoretical ch circle of We 1, under mobile wireless propagation conditions, serious intersymbol interference is there is（Inter Symbol Interference), multi-access inference (Mul t iple Acces s Interference) and adjacent area interference (Adjacent Cel l Interference), and fatal " far-near effect "（Suppress weak effect）, for that purpose it is necessary to using fast power control technology, make the signal of each user receive disconnected unanimous on the whole, can tolerate so that interference level is relative.Therefore, traditional CDMA is the system of interference-limited (Interference Limi t ted), i.e. its power system capacity is limited to the size of the interference level in whole cdma system.TD- LAS systems rely on brand-new address code design theory, make its LAS codes institute
" zero interference window " characteristic having, essentially eliminate the interference in the presence of conventional CDMA system, completely eliminate " far-near effect ", therefore there is no its importance for Power Control, so that TD-LAS systems turn into the system of noise limited, so that power system capacity and spectrum efficiency has been significantly increased.The aufbauprinciple and building method of LAS-CDMA and tradition CDMA address code are entirely different.
TD- LAS system group network technologies：Cdma system uses channeling for one networking plan, i.e., different cells are using identical frequency.In order to distinguish different cells, and adjacent area interference is reduced, it is necessary to carry out networking using code space.In traditional CDMA, the Networking Design between cell is carried out using the different skews of long PN codes.In TD-LAS systems, LA codes and LS codes can be comprehensively utilized（The schemes such as different interval arrangement and the rotation transformation of combinations of polarities, the different sets of LS codes, and LS codes including LA codes）Carry out the networking between cell.Meanwhile, the combination of the excellent correlation properties and information source of LAS codes/error-correcting channel coding can be effectively reduced the interference between neighbor cell, so as to further increase power system capacity and spectrum efficiency.LAS-CDMA and tradition CDMA networking principle and network-building method is entirely different.
TD-LAS frame structures：The design of wireless frame structure depend heavilys on the basic fundamental of physical layer.The frame structure of conventional CDMA system is designed based on PN. codes and Wal sh codes.The characteristics of design of the wireless frame structure of TD-LAS systems has fully demonstrated LAS codes, its unique subframe is made up of LA codes and LS codes.Such design, you can fully to have given play to the advantage that LA codes and LS codes are mutually combined, and can effectively support in time division duplex（TDD) the big region overlay under working method, while also flexible dynamically distributes can be carried out to the rate ratio and type of service of system up-downgoing business.
Baseband filter：Radio receiving-transmitting unit is the element of system, the frequency specification requirement being wirelessly transferred to ensure system to disclosure satisfy that in normal work, and baseband filter is a crucial technology.In conventional CDMA system, the baseband filter of use is characteristic and and design based on PN codes and Wal sh codes；It is based on supporting speech business and low dimensional modulation mode such as BPSK,
The base band shaping filter of QPSK/DQPSK, GMSK design is difficult to the high-speed data service for supporting future mobile communication system.In TD-LAS systems, for the unique features of LA codes and LS codes, specially designed finite impulse response base band shaping filter is employed.This base band shaping filter, with linear phase, compared with the base band shaping filter in existing GSM, with more preferable amplitude-frequency response characteristic, has preferable robustness to sample time error（Robustness), not only make to use BPSK, QPSK/DQPSK, the digital baseband signal wave distortion of the low dimensional modulation mode such as GMSK is smaller, and for using 8 PSK, 16PSK, 32PS, 16QAM, 32QAM, 64QAM, the digital baseband signal wave distortion of the higher-dimension modulation system such as 64 PSK is smaller, digital mobile communication system can be supported to use multidimensional simplex mode, such as 8 PSK, 16PSK, 32PSK, 16QAM, 32QAM, 64QAM, 64 PSK etc. realize the high speed data transfer of the general efficiency of high frequency i, and for disturbing smaller between adjacent channel in system, disturbed simultaneously for other communication systems thousand also smaller, GSM especially high-speed mobile communication system spectrum efficiency and power system capacity can be improved, so as to be laid the foundation to set up Large Copacity and the radio digital communication system of high number data transmission service can be provided.
TPC channel codings：For effectively transmitting high speed data in wireless environments, Turbo code channel coding technology is a crucial technology.In traditional CDMA systems, generally employ PCCC (parallel concatenated convolutional code) and SCCC (serial concatenated convolutional code) Turbo codings, its corresponding decoding algorithm is software- redundancy Iterated MAP decoding algorithm, LOG-MAP or simplifies algorithm such as MAX- LOG- MAP, S0VA etc., all it is a kind of operand very big two-way algorithm, correspondence decoder architecture is complicated, cost is high, processing speed is slow, time delay is larger.In TD-LAS systems, TPC (turbo product code) channel coding technology is employed, and a kind of new iterative decoding algorithm can be used：The iterative decoding method of cascade block code based on subcode syndrome decoding.This decoding algorithm is that can be used for cascading block code and its iterative decoding method of special shape product code, and its subcode decoding is based on sorting in the middle part of combination verification matrix
The row selected and the syndrome decoding carried out.The list decoding can effectively produce soft output value, so that the iterative decoding of cascade block code and its special shape product code is feasible.By adjusting the parameter 1 in interpretation method, the design of decoder can be in performance and decoding complexity compromise selection therebetween.Compared with conventional CDMA system using PCCC (para l lel concatenated convolut ional code) and SCCC (ser ia l concatenated convolut iona l code) Turbo codings, the TPC (turbo product code) of TD-LAS systems channel coding technology, correspondence encoder and decoder structure is simple, with relatively low complexity, processing speed be fast, time delay is smaller, and higher channel coding gain can be obtained for high coding efficiency and short frame.
TP-HARQ:The following GSM towards IP operation, high efficiency and reliability to wireless block data transmission propose very high requirement, and HARQ is a crucial technology.Existing 3G systems mostly realize physical layer error control using the RCPT/HARQ technologies based on PCCC schemes.Realizing for I type systems is relatively simple, but in the case of identical QoS is ensured, system effectiveness is substantially not so good as II type systems.In the various methods of II type systems, Chase combined methods can not provide effective throughput of system in the high channel bit error rate, and improve systematic function under severe channel circumstance using IR methods must be to increase the complexity and cost of system as cost.TD-LAS systems are using a kind of TP-ARQ technologies encoded based on TPC, its main advantage：System is from a class error correcting capability is strong, the TPC error correction of simple structure.On the one hand, due to TPC in actual applications can the positive random error and burst errors of Tong Shi Correction, thus be particularly suitable for use in the complicated channel circumstance of interference.System can suitably be truncated by reasonably choosing subcode, and to it, obtain more flexible code check.When code check is more than 2/3, the performance of TPC schemes is better than PCCC schemes, and TPC is more suitable for short frame structure.On the other hand, the software- redundancy Iterated MAP decoding algorithm that PCCC schemes are used（Or simplify algorithm）It is a kind of operand very big two-way algorithm, correspondence decoder architecture is complicated, cost is high, processing speed is slow.When channel conditions deteriorate, HARQ systems may need many stage Turbo code cascades to provide enough redundancies to obtain preferable error performance, from
And add the complexity of system decoding algorithm and decoding equipment.Comparatively, TPC schemes simplify volume, decoding equipment with its simple code structure design and decoding algorithm, accelerate decoding processing speed, thus reduce the complexity that system is realized while guarantee systematic function.In addition, TP- ARQ schemes also use a kind of preferable TPC decoding algorithms TPC iterative decoding algorithms based on subcode syndrome decoding one by one, the linear block code decoding algorithm that a kind of will reduce complexity is applied to the iterative decoding of product code.Its advantage is that preferable decoding performance is obtained while algorithm complex is not increased, and can support further types of subcode.The selection of the algorithm further makes TP-ARQ systems obtain high coding gain as far as possible and system effectiveness with alap system complexity.
STSTD transmitting diversities：Transmitting diversity technology can effectively improve the efficiency of system, improve performance of the system under fading channel.In conventional CDMA system, the transmitting diversity technology such as TSTD, STTD, 0TD, STD is employed.Preceding 3 be all the pattern of open loop, STD then uses the pattern of semi-loop, upstream data that i.e. transmitting diversity of base station end need to be sent according to mobile station selects descending antenna, and due to being to carry out channel estimation and demodulation by continuous pilot signal, so, base station it is also required to provide descending indicator, notify mobile station which pilot channel should go demodulation with.There is following defect in existing emission diversity method mentioned above：For example when the emission diversity method using open loop, the improvement to system receptivity is less desirable, and precision is not high enough, very sensitive to environment；And above-mentioned STD semi-loop emission diversity method is used, realize more complicated, due to needing to carry out channel estimation and demodulation by continuous pilot signal, descending indicator is then provided accordingly, implement more complicated, be of limited application.In order to solve the defect and deficiency of prior art presence, TD- LAS systems are intended using a kind of new emission diversity method-STSTD.This method can improve emission diversity performance well.STSTD is characterized in that：Adaptive emitting antenna selecting is carried out using Predicting Technique, i.e. according to the symmetry and continuity of backward channel before TDD system, the fading coefficients of forward channel are estimated using the fading coefficients of backward channel, according to estimated fading coefficients, in the selection transmitting antenna of transmitting terminal adaptively, adopted in down channel
Channel estimation and demodulation are carried out with dedicated pilot (channel).Using STSTD, due to make use of Predicting Technique, so descending fading coefficients can be estimated correctly, and traditional STD is the selection before simply being carried out using reverse fading coefficients to transmission, without carrying out any prediction, so, this method more can accurately select antenna than STD.The transmission of control instruction is saved, the performance that can be reached using closed loop STD systems can be reached to, reverse indicator due to being demodulated using dedicated pilot (channel), thus before no longer needing.
Uplink synchronous：Synchronous CDMA system requires that each user keeps synchronous when reaching base station, therefore uplink synchronous is a crucial technology.In conventional CDMA system, particularly synchronous CDMA system（As realized.In TD-LAS systems, the uplink synchronous subframe of uniqueness is devised, the access pulse of wherein uplink synchronous is constituted based on LS codes.There is unique symmetry characteristic just because of LS codes, therefore uplink synchronous channel receiving terminal is equipped with corresponding matched filter and carries out related operation can obtain extraordinary autocorrelation performance, i.e., with higher main peak, submaximum is less than or equal to zero.This autocorrelation performance can resist decline well, increase the accuracy of reverse sync.
The spreading code LS codes used in TD-LAS systems have zero window property of cross-correlation, so the code sequence of the up all users of system requirements reaches base station simultaneously, therefore, one standard time is set at the uplink synchronous channel receiver of base station, and default uplink synchronous success threshold value, when the gap of time and standard time that uplink synchronous pulse reaches base station are less than default uplink synchronous success threshold value, then it is assumed that uplink synchronous success；It is on the contrary, then it is assumed that still failed, uplink synchronous process need to proceed.Up bit synchronization and frame synchronization are completed simultaneously.
Down-going synchronous：For mobile station, the premise for realizing system access is to complete down-going synchronous.In conventional CDMA system, the realization of down-going synchronous is related by the slip to PN codes, searches for all possible PN code phases to complete synchronization acquistion.In TD-LAS systems, the descending of uniqueness is devised
Synchronous subframe, is made up of LA codes and LS codes.LS+LA code characters have excellent auto-correlation and cross correlation（Cycle it is related to it is aperiodic related）, it is used directly for synchronization acquistion.Using with a certain particular channel（Such as descending synchronous signal channel）The matched filter of matching, may search for the set of whole LS+LA code characters, carry out cell searching and Target cell search.According to the characteristics of LS+LA codes, to same LS codes sequence, the different synchronizing sequences that different LA pulse code methods are realized can need not increase hardware resource with parallel search.This method shortens the time of synchronization acquistion relative to the slip relevant search of long PN codes, improves the performance of cell searching and Target cell search.
Power is adjusted：In conventional CDMA system, quick power control techniques are employed, to solve fatal " far-near effect ".The forward power that power control frequencies are 1600HZ is for example employed in wcdma to control.Although power control rate is improved, simulation result shows, this quick Power Control is to the fast-fading effect in tracking wireless propagation environment nor fairly obvious.And due to the nonopiate characteristic of skew between the spreading code of each user, typical wireless multi-path communication environments can not be tackled, therefore " the far-near effect " brought produces no small influence to the power control strategy and effect of whole multiuser CDMA systems.In TD-LAS systems, due to " zero correlation window " characteristic of LAS codes, so in the absence of " far-near effect " in conventional CDMA system.Therefore, power adjustment technology can be used, these technologies both include the power pre-distribution scheme that can be made according to known geographic environment distributed intelligence, also include that the dynamic power adjustment that real-time user power distribution needs and carried out can be occupied, and the dynamic range of the power adjustment carried out to user, will be apparently higher than conventional CDMA system（" dynamic range " mentioned here is dramatically increased, and relies on to reduction " power needed for minimum " index to complete）.If tradition CDMA reduces transmission power due to that can carry out a range of Power Control, and if being referred to as " environmental protection " mobile phone, LAS-CDMA technologies are due to that can carry out more thorough and more rational power adjustment, further reduce the transmission power of mobile phone and base station, reduce the power consumption of mobile phone, the stand-by time of increase mobile phone, the spy that this will more embody the technology " people-oriented, using environment as this "
Color.
Switching：In conventional CDMA system, its networking plan based on PN codes and Wa l sh codes determines the presence of inter-cell interference.In order to enable a system to normal work, the soft hand-off of complexity is employed.In TD-LAS systems, due to the networking plan that make use of LA codes and LS code-phases to combine, so greatly reducing adjacent area interference.Therefore, relatively simple hard-switching technology is employed.
In the system using soft handover, each cell or sector are sent with same spread code（Wa l sh codes）With the continuous pilot signal of different skew PN codes, the PN offset informations containing each neighbor cell or sector in MS, these information are respectively stored in different subsets（Activate subset, candidate subset, adjacent subset and reservation subset）, and will update and update with condition.All cells or sector in MS coactivation subsets are communicated, and the diversity that MS needs complicated Rake receivers to carry out forward link merges.BS is necessary for keeping the MS of communication to provide channel, and provides the link towards MSC for the wherein mobile station in handover between cells state, is merged with the diversity for carrying out reverse link.Soft handover realizes seamless switching.
In TD-LAS systems, each cell or sector send the LA code information containing each neighbor cell or sector in the continuous pilot signal with identical LS codes and different LA codes, MS.Only same cell or sector keep communication to MS, when service feature is reduced to a certain extent, MS will open another down-going synchronous receiver, and poll measures other cells or the downlink synchronous signal intensity of sector, and calculate synchronous time deviation between different districts.MS is received after the switching command that network-side is sent, the communication with current area or sector will be interrupted immediately, directly uplink service information is sent using time deviation measured value to new cell or sector and downstream communications link is set up, and BS carries out the tracking and adjustment of uplink synchronous by uplink pilot signal.If uplink service information can't pass CRC check in a period of time, MS will stop the communication of uplink service, and uplink synchronous pulse is sent in idle access slot, uplink synchronous is set up with new cell again.Direct-cut operation is not seamless switching.
Dynamic code assignment：In conventional CDMA system, the networking side of PN codes and Wa l sh codes make use of
Case.Due to the difference of the biography letter rate required by speech and data service（Use short code more speech, long code is used more data）, during code assignment, once the code word on trunk is allocated to MS, the code word in its respective branches will not be reusable.The fdd mode of WCDMA systems just uses this dynamic 0VSF allocation strategies.Based on the design philosophy of interference white noise, the distribution of each cell or sector to Wa l sh codes is more random better.
In TD-LAS systems, the networking plan that make use of LA codes and LS code-phases to combine.TD-LAS systems do not use the different multiple access code of length to meet the requirement of the speech biography letter rate different with data service respectively, but use the code word of same spread length, for high-rate service using the method for splitting spread spectrum.It is better to the distribution more rule of LS codes in each cell or sector because difference LS code group-wise zero correlation windows is of different sizes, as far as possible using the code character of larger zero correlation window, reduce the interference to adjacent cell or sector.
Dynamic channel allocation：Dynamic channel allocation is divided at a slow speed and fast DCA.CDMA2000 systems do not use dynamic channel allocating technology in order, because it is to realize networking using the skew of PN codes, and it can only regularly distribute the configuration of PN codes skew in the network planning for each cell；The tdd mode of WCDMA system employs dynamic（At a slow speed and quickly）Channel allocation technique.
TD-LAS systems equally use dynamic channel allocating technology in order.Slow dynamic channel allocation is identical with tradition CDMA systems, just the blunt up-downgoing business load situation according to long-time different districts, the different uplink and downlink timeslot of quantity allotted.As for fast DCA, because TD- LAS distinguish user using LS codes, unique " zero interference window " characteristic of LS codes make it that the distribution towards movement station progress channel resource is more flexible, while also more complicated；The networking mode of simultaneously special LA code combination LS codes so that different districts are possible to use different time slot distribution patterns.
Binary channels channel estimation：For signal fadeout and distortion of the compensation mobile system in communication channel, it is necessary to use channel estimation technique.In fading channel, the order of accuarcy of channel estimation directly affects systematic function quality.It is total in traditional cdma system, using CP continuous pilot channel estimation methods and dedicated pilot
Channel estimation methods.Using the channel estimation methods of CP continuous pilot, it is necessary to take a special channel, thus to increase the transmission power of emitter, thus CP continuous pilot is served only for the downlink communication of synchronization CDMA system（From base station to mobile station）In, and dedicated pilot (channel) method of estimation, influenceed larger by mobile station translational speed, when in high-speed mobile environment, systematic function can deteriorate rapidly.In TD-LAS systems, the binary channels channel estimation methods for intending using are compared with traditional channel estimation methods, with the transmission power of signal can be saved, influence of the deep fade to signal amplitude and phase can effectively be overcome, it is ensured that the advantages of modulation system of more higher-dimension is applied under high-speed mobile environment.Now, the performance of system is influenceed smaller by the movement velocity of mobile station, influenceed smaller by the rapid fading that Doppler frequency-shift is caused, thus it can effectively overcome influence of the deep fade that high-speed mobile is brought to signal amplitude and phase, it can be ensured using such a method simultaneously and 8 PSK, 16PSK, 32PS are applied under high-speed mobile environment, 16QAM, 32QAM, 64QAM, the modulation system of 64 PSK these more higher-dimensions.
In summary it is described, specific implementation such as Fig. 3 of apparatus of the present invention, shown in Fig. 4：Emitter at least includes the spread spectrum device for using LAS codes for spread spectrum multiple access code；Described receiver is at least included based on the despreading device that LAS codes are spread spectrum multiple access code；Described emitter may also include radio frames framing apparatus, finite impulse response baseband filter, TPC encoders, modulator, CRC check device, harq controller, sychronisation, STSTD transmission diversity apparatus, power adjustment apparatus；Described receiver may also include radio frames and go frame device, matched filter, the TPC iterative decoders based on subcode syndrome, demodulator, CRC checkers, sychronisation, STSTD to receive diversity apparatus；Wherein the subframe of wireless frame structure is made up of LA codes and LS codes；The information that information source is sent can through the verification of CRC check device, TPC encoders coding, the modulation of modulator, use LAS codes for spread spectrum multiple access code spread spectrum device spread spectrum, the filtering of radio frames framing apparatus framing, finite impulse response baseband filter, the transmitting diversity of STSTD transmission diversity apparatus, power adjustment apparatus power adjust, power adjust after be transmitted into channel；The information that the stay of two nights is received can pass through reception diversity, the filtering of matched filter, the radio frames that the synchronization of sychronisation, STSTD receive diversity apparatus
Go what frame device carried out to remove frame, based on the reception diversity that LAS codes are spread spectrum multiple access code, the despreading of despreading device progress, the demodulation of demodulator, the decoding of TPC iterative decoders based on subcode syndrome, the verification of CRC check device；The CRC check device of receiver can feed back HARQ to harq controller to carry out the re-transmission of Error Control and originator.A kind of device for structure TD- LAS systems that the present invention is provided；It is based on LAS-CDMA core technologies, towards the GSM of " full IP ", the auto-correlation and cross correlation of LAS codes form " the zero interference window " of uniqueness, and this is the characteristics of spread spectrum multiple access code that other conventional CDMA communication systems are used is not available.The interference between neighbor cell greatly reduces in the present invention, improves power system capacity and spectrum efficiency；Can effectively it support in time division duplex（TDD) the big region overlay under working method, while also flexible dynamically distributes can be carried out to the rate ratio and type of service of system up-downgoing business；There can be more preferable amplitude-frequency response characteristic, have preferable robustness to sample time error（Robus tnes s), not only make to use BPSK, QPSK/DQPSK, the digital baseband signal wave distortion of the low dimensional modulation mode such as GMS is smaller, and for using 8 PSK, 16PSK, 32PSK, 16QAM, 32QAM, 64QAM, the digital baseband signal wave distortion of the higher-dimension modulation system such as 64 PSK is smaller, digital mobile communication system can be supported to use multidimensional simplex mode, such as 8 PSK, 16PSK, 32PSK, 16QAM, 32QAM, 64QAM, 64 PS etc. realize the high speed data transfer of spectral efficient, and for disturbing smaller between adjacent channel in system, disturb also smaller simultaneously for other communication systems, GSM especially high-speed mobile communication system spectrum efficiency and power system capacity can be improved, so as to be laid the foundation to set up Large Copacity and the radio digital communication system of high number data transmission service can be provided；
The corresponding encoder and decoder structure cylinder of the present invention is single, with relatively low complexity, processing speed soon, time delay it is smaller, higher channel coding gain can be obtained for high coding efficiency and short frame, in actual applications to correct random error and burst error simultaneously, thus it is particularly suitable for use in the complicated channel circumstance of interference；Volume, decoding equipment are simplified, decoding processing speed is accelerated, thus is ensureing the same of systematic function
When reduce system realization complexity.Preferable decoding performance is obtained while algorithm complex is not increased, and further types of subcode can be supported.TP- ARQ systems are further made to obtain high coding gain as far as possible and system effectiveness with alap system complexity.
The present invention can also improve emission diversity performance well, it is possible to resistance decline well, increase the accuracy of reverse sync.Present invention reduces the time of synchronization acquistion, the performance of cell searching and Target cell search is improved.
The present invention is not present " far-near effect " in conventional CDMA system.Therefore, power adjustment technology can be used, these technologies both include the power pre-distribution scheme that can be made according to known geographic environment distributed intelligence, also include that the dynamic power adjustment that real-time user power distribution needs and carried out can be occupied, and the dynamic range of the power adjustment carried out to user, will be apparently higher than conventional CDMA system（" dynamic range " mentioned here is dramatically increased, and relies on to reduction " power needed for minimum " index to complete）.If tradition CDMA reduces transmission power due to that can carry out a range of Power Control, and if being referred to as " environmental protection " mobile phone, LAS-CDMA technologies are due to that can carry out more thorough and more rational power adjustment, further reduce the transmission power of mobile phone and base station, reduce the power consumption of mobile phone, the stand-by time of increase mobile phone, the characteristic that this will more embody the technology " people-oriented, using environment as this ".
The present invention greatly reduces adjacent area interference.Therefore, relatively simple hard-switching technology is employed.Reduce the interference to adjacent cell or sector.So that different districts are possible to use different time slot distribution patterns.The transmission power of signal can be saved, influence of the deep fade to signal amplitude and phase can be effectively overcome, it is ensured that the advantages of modulation system of more higher-dimension is applied under high-speed mobile environment.Now, the performance of system is influenceed smaller by the movement velocity of mobile station, influenceed smaller by the rapid fading that Doppler frequency-shift is caused, thus can effectively overcome influence of the deep fade that high-speed mobile is brought to signal amplitude and phase, while using such a method can ensure under high-speed mobile environment using 8 PSK, 16PSK, 32PSK,
QAM, 32QAM, 64QAM, the modulation system of 64 PSK these more higher-dimensions
Claims (37)
- Claim1. a kind of method of structure TD-LAS systems, including：LAS codes are used for spread spectrum multiple access code；The networking between cell is carried out using LA codes and LS codes；The subframe of wireless frame structure is made up of LA codes and LS codes；The access pulse of uplink synchronous is constituted based on LS codes；Sub-frame of downlink synchronization is made up of LA codes and LS codes.2. the method according to claim 1, it is characterised in that the networking that described use LA codes and LS codes are carried out between cell includes：Using the code word of same spread length, spread for high-rate service using segmentation；Different LS codes group-wise zero correlation windows it is of different sizes, it is better to the distribution more rule of LS codes in each cell or sector, as far as possible using the code character of larger zero correlation window, reduce outstanding to dry the 4 of adjacent cell or sector.3. according to the method described in claim 1, it is characterised in that the access pulse of described uplink synchronous, which is based on LS codes composition, to be included：The spreading code LS codes used in TD-LAS systems have zero window property of cross-correlation, so the code sequence of the up all users of system requirements reaches base station simultaneously, therefore, one standard time is set at the uplink synchronous channel receiver of base station, and default uplink synchronous success threshold value, when the gap of time and standard time that uplink synchronous pulse reaches base station are less than default uplink synchronous success threshold value, then it is assumed that uplink synchronous success；On the contrary, then it is assumed that uplink synchronous is still failed, uplink synchronous process need to proceed, and up bit synchronization and frame synchronization are completed simultaneously.4. according to the method described in claim 1, it is characterised in that described sub-frame of downlink synchronization by LA codes and LS codes constitute including：LS+LA code characters have excellent auto-correlation and cross correlation, are used directly for synchronization acquistion；Using the matched filter matched with a certain particular channel, the set of whole LS+LA code characters is may search for, cell searching and Target cell search is carried out；Just the characteristics of the blunt code according to LS+LA, to same LS codes sequence, the different synchronizing sequences that different LA pulse code methods are realized can be simultaneously Row is searched for and need not increase hardware resource.5. according to the method described in claim 1, it is characterised in that it also includes：Encoded using TPC codes.6. according to the method described in claim 1, it is characterised in that it also includes：Decoded using TPC codes.7. method according to claim 6, it is characterised in that described TPC codes decoding can enter row decoding using the TPC iterative decodings based on subcode syndrome.8. according to the method described in claim 1, it is characterised in that it also includes：Encoded using TPC codes, row decoding is entered using the TPC iterative decodings based on subcode syndrome.9. according to the method described in claim 1, it is characterised in that it also includes：Error Control is carried out using the TP- ARQ encoded based on TPC.10. according to the method described in claim 1, it is characterised in that it also includes：Encoded using TPC codes, row decoding is entered using the TPC iterative decodings based on subcode syndrome, Error Control is carried out using the TP-ARQ encoded based on TPC.1 1. according to the method described in claim 1, it is characterised in that it also includes：It is filtered using finite impulse response baseband filter.12. according to the method described in claim 1, it is characterised in that it also includes：Encoded using TPC codes, row decoding is entered using the TPC iterative decodings based on subcode syndrome, Error Control is carried out using the TP- ARQ encoded based on TPC, is filtered using finite impulse response baseband filter.1 3. according to the method described in claim 1, it is characterised in that it also includes：Using STSTD transmitting diversities.14. according to the method described in claim 1, it is characterised in that it also includes：Encoded using TPC codes, row decoding is entered using the TPC iterative decodings based on subcode syndrome, using based on TPC The TP-ARQ of coding carries out Error Control, is filtered using finite impulse response baseband filter, using STSTD transmitting diversities.15. according to the method described in claim 1, it is characterised in that it also includes：BPSK can not only be used, the low dimensional modulation mode such as QPSK/DQPSK, GMSK, and can be modulated using multidimensional simplex mode, described multidimensional simplex mode can be 8 PSK, 16PSK, 32PSK, 16QAM, 32QAM, 64QAM, 64 PSK etc..16. according to the method described in claim 1, it is characterised in that it also includes：Encoded using TPC codes, row decoding is entered using the TPC iterative decodings based on subcode syndrome, Error Control is carried out using the TP-ARQ encoded based on TPC, it is filtered using finite impulse response baseband filter, using STSTD transmitting diversities, BPSK can not only be used, QPSK/DQPSK, the low dimensional modulation mode such as GMSK, and can be modulated using multidimensional simplex mode, described multidimensional simplex mode can be 8 PSK, 16PSK, 32PSK, 16QAM, 32QAM, 64QAM, 64 PS etc..17. according to the method described in claim 1, it is characterised in that it also includes：Uplink synchronous channel receiving terminal is equipped with corresponding matched filter and carries out computing.18. according to the method described in claim 1, it is characterised in that it also includes：Encoded using TPC codes, row decoding is entered using the TPC iterative decodings based on subcode syndrome, Error Control is carried out using the TP-ARQ encoded based on TPC, it is filtered using finite impulse response baseband filter, using STSTD transmitting diversities, BPSK can not only be used, QPSK/DQPSK, the low dimensional modulation mode such as GMSK, and can be modulated using multidimensional simplex mode, described multidimensional simplex mode can be 8 PSK, 16PSK, 32PSK 16QAM, 32QAM, 64QAM, 64 PS etc., uplink synchronous channel receiving terminal is equipped with corresponding matched filter and carries out computing.19. according to the method described in claim 1, it is characterised in that it also includes：Adjusted using power.20. according to the method described in claim 1, it is characterised in that it also includes：Encoded using TPC codes, row decoding is entered using the TPC iterative decodings based on subcode syndrome, Error Control is carried out using the TP- ARQ encoded based on TPC, it is filtered using finite impulse response baseband filter, using STSTD transmitting diversities, BPSK can not only be used, QPSK/DQPSK, the low dimensional modulation mode such as GMSK, and can be modulated using multidimensional simplex mode, described multidimensional simplex mode can be 8 PSK, 16PSK, 32PSK, 16QAM, 32QAM, 64QAM, 64 PSK etc., uplink synchronous channel receiving terminal is equipped with corresponding matched filter and carries out computing, adjusted using power.21. according to the method described in claim 1, it is characterised in that it also includes：Switched over using direct-cut operation.22. the method according to claim 21, it is characterised in that described direct-cut operation includes：In TD-LAS systems, each cell or sector send the LA code information containing each neighbor cell or sector in the continuous pilot signal with identical LS codes and different LA codes, MS；Only same cell or sector keep communication to MS, when service feature is reduced to a certain extent, MS will open another down-going synchronous receiver, and poll measures other cells or the downlink synchronous signal intensity of sector, and calculate synchronous time deviation between different districts；MS is received after the switching command that network-side is sent, the communication with current area or sector will be interrupted immediately, directly uplink service information is sent using time deviation measured value to new cell or sector and downstream communications link is set up, and BS carries out the tracking and adjustment of uplink synchronous by uplink pilot signal；If uplink service information can't pass CRC check in a period of time, MS will stop the communication of uplink service, and uplink synchronous pulse is sent in idle access slot, uplink synchronous is set up with new cell again；Direct-cut operation is not seamless switching.23. according to the method described in claim 1, it is characterised in that it also includes：Encoded using TPC codes, row decoding is entered using the TPC iterative decodings based on subcode syndrome, Error Control is carried out using the TP-ARQ encoded based on TPC, is filtered, adopted using finite impulse response baseband filter Use STSTD transmitting diversities, BPSK can not only be used, QPS/DQPS, the low dimensional modulation mode such as GMSK, and can be modulated using multidimensional simplex mode, described multidimensional simplex mode can be 8 PSK, 16PSK, 32PSK, 16QAM, 32QAM, 64QAM, 64 PSK etc., uplink synchronous channel receiving terminal is equipped with corresponding matched filter and carries out computing, is adjusted, is switched over using direct-cut operation using power.24. according to the method described in claim 1, it is characterised in that it also includes：Channel resource allocation is carried out using dynamic channel allocation.25. according to the method described in claim 1, it is characterised in that it also includes：Encoded using TPC codes, row decoding is entered using the TPC iterative decodings based on subcode syndrome, Error Control is carried out using the TP-ARQ encoded based on TPC, it is filtered using finite impulse response baseband filter, using STSTD transmitting diversities, BPSK can not only be used, QPSK/DQPSK, the low dimensional modulation mode such as GMSK, and can be modulated using multidimensional simplex mode, described multidimensional simplex mode can be 8 PSK, 16PSK, 32PSK, 16QAM, 32QAM, 64QAM, 64 PSK etc., uplink synchronous channel receiving terminal is equipped with corresponding matched filter and carries out computing, adjusted using power, switched over using direct-cut operation, channel resource allocation is carried out using dynamic channel allocation.26. according to the method described in claim 1, it is characterised in that it also includes：Using binary channels channel estimation.27. according to the method described in claim 1, it is characterised in that it also includes：Encoded using TPC codes, row decoding is entered using the TPC iterative decodings based on subcode syndrome, Error Control is carried out using the TP-ARQ encoded based on TPC, it is filtered using finite impulse response baseband filter, using STSTD transmitting diversities, BPSK can not only be used, QPSK/DQPSK, the low dimensional modulation mode such as GMSK, and can be modulated using multidimensional simplex mode, described multidimensional simplex mode can be 8 PSK, 16PSK, 32PSK, 16QAM, 32QAM, 64QAM, 64 PSK etc., uplink synchronous channel receiving terminal is equipped with corresponding matched filter and carries out computing, adjusted using power, switched over using direct-cut operation, adopt Channel resource allocation is carried out with dynamic channel allocation, using binary channels channel estimation.28. a kind of device of structure TD-LAS systems, it is made up of transmitter and receiver, wherein described emitter at least includes the spread spectrum device for using LAS codes for spread spectrum multiple access code；Described receiver is at least included based on the despreading device that LAS codes are spread spectrum multiple access code；The information that information source is sent is at least through using LAS codes to be transmitted into channel after the spread spectrum device spread spectrum of spread spectrum multiple access code；The despreading of the information that the stay of two nights is received at least by being carried out based on the despreading device that LAS codes are spread spectrum multiple access code.29. device according to claim 28, it is characterised in that described emitter may also include radio frames framing apparatus；Described receiver may also include radio frames and remove frame device；Wherein the subframe of wireless frame structure is made up of LA codes and LS codes；The information that information source is sent can be transmitted into channel through using LAS codes for the spread spectrum device spread spectrum of spread spectrum multiple access code, after radio frames framing apparatus framing；The stay of two nights receive information can by radio frames go frame device carry out go frame, based on LAS codes be spread spectrum multiple access code despreading device progress solution it is rustic.30. device according to claim 28, it is characterised in that described emitter may also include radio frames framing apparatus, finite impulse response baseband filter；Described receiver may also include radio frames and remove frame device, matched filter；Wherein the subframe of wireless frame structure is made up of LA codes and LS codes；The information that information source is sent can be through using LAS codes to be transmitted into channel after being filtered for spread spectrum device spread spectrum, radio frames framing apparatus framing, the finite impulse response baseband filter of spread spectrum multiple access code；What the information that the stay of two nights is received can go that frame device carries out by the filtering of matched filter, radio frames go frame, based on LAS codes be spread spectrum multiple access code despreading device progress despreading.31. device according to claim 28, it is characterised in that described emitter may also include radio frames framing apparatus, finite impulse response baseband filter, TPC encoders；Described receiver may also include radio frames and remove frame device, matched filter, TPC decoders；The wherein subframe of wireless frame structure It is made up of LA codes and LS codes；The information that information source is sent can encode through TPC encoders, use LAS codes to be transmitted into channel after being filtered for spread spectrum device spread spectrum, radio frames framing apparatus framing, the finite impulse response baseband filter of spread spectrum multiple access code；What the information that the stay of two nights is received can go that frame device carries out by the filtering of matched filter, radio frames go frame, based on LAS codes be spread spectrum multiple access code despreading device progress despreading, the decoding of TPC decoders.32. device according to claim 28, it is characterised in that described emitter may also include radio frames framing apparatus, finite impulse response baseband filter, TPC encoders；Described receiver may also include radio frames and remove frame device, matched filter, the TPC iterative decoders based on subcode syndrome；Wherein the subframe of wireless frame structure is made up of L A codes and LS codes；The information that information source is sent can encode through TPC encoders, use LAS codes to be transmitted into channel after being filtered for spread spectrum device spread spectrum, radio frames framing apparatus framing, the finite impulse response baseband filter of spread spectrum multiple access code；What the information that the stay of two nights is received can go that frame device carries out by the filtering of matched filter, radio frames go frame, based on LAS codes be spread spectrum multiple access code despreading device progress despreading, the decoding of TPC iterative decoders based on subcode syndrome.33. device according to claim 28, it is characterised in that described emitter may also include radio frames framing apparatus, finite impulse response baseband filter, TPC encoders, modulator；Described receiver may also include radio frames and remove frame device, matched filter, TPC iterative decoders, demodulator based on subcode syndrome；Wherein the subframe of wireless frame structure is made up of LA codes and LS codes；The information that information source is sent can through TPC encoders coding, the modulation of modulator, use LAS codes for spread spectrum multiple access code spread spectrum device spread spectrum, radio frames framing apparatus framing, finite impulse response baseband filter filter after be transmitted into channel；What the information that the stay of two nights is received can go that frame device carries out by the filtering of matched filter, radio frames go frame, it is the despreading of despreading device progress of spread spectrum multiple access code, the demodulation of demodulator, the decoding of TPC iterative decoders based on subcode syndrome based on LAS codes.34. device according to claim 28, it is characterised in that described emitter may also include radio frames framing apparatus, finite impulse response baseband filter, TPC encoders, modulator, CRC check device, harq controller；Described receiver may also include radio frames and remove frame device, matched filter, the TPC iterative decoders based on subcode syndrome, demodulator, CRC check device；Wherein the subframe of wireless frame structure is made up of LA codes and LS codes；The information that information source is sent can through the verification of CRC schools ^ devices, TPC encoders coding, the modulation of modulator, use LAS codes for spread spectrum multiple access code spread spectrum device spread spectrum, radio frames framing apparatus framing, finite impulse response baseband filter filter after be transmitted into channel；What the information that the stay of two nights is received can go that frame device carries out by the filtering of matched filter, radio frames go frame, it is the despreading of despreading device progress of spread spectrum multiple access code, the demodulation of demodulator, decoding, the verification of CRC check device of TPC iterative decoders based on subcode syndrome based on LAS codes；The CRC check device of receiver can feed back HARQ to harq controller to carry out the re-transmission of Error Control and originator.35. device according to claim 28, characterized in that, described emitter may also include radio frames framing apparatus, finite impulse response baseband filter, TPC encoders, modulator, CRC check device, harq controller, sychronisation；Described receiver may also include radio frames and remove frame device, matched filter, the TPC iterative decoders based on subcode syndrome, demodulator, CRC check device, sychronisation；Wherein the subframe of wireless frame structure is made up of LA codes and LS codes；The information that information source is sent can through the verification of CRC check device, TPC encoders coding, the modulation of modulator, use LAS codes to be filtered for spread spectrum device spread spectrum, radio frames framing apparatus framing, the finite impulse response baseband filter of spread spectrum multiple access code, be transmitted into channel after the synchronization of sychronisation；What the information that the stay of two nights is received can go that frame device carries out by the synchronization of sychronisation, the filtering of matched filter, radio frames go frame, it is the despreading of despreading device progress of spread spectrum multiple access code, the demodulation of demodulator, decoding, the verification of CRC check device of TPC iterative decoders based on subcode syndrome based on LAS codes；The CRC check device of receiver can be anti- HARQ is presented to harq controller to carry out the re-transmission of Error Control and originator.36. device according to claim 28, characterized in that, described emitter may also include radio frames framing apparatus, finite impulse response baseband filter, TPC encoders, modulator, CRC check device, harq controller, sychronisation, STSTD transmission diversity apparatus；Described receiver may also include radio frames and go frame device, matched filter, the TPC iterative decoders based on subcode syndrome, demodulator, CRC schools ^^ devices, sychronisation, STSTD to receive diversity apparatus；Wherein the subframe of wireless frame structure is made up of LA codes and LS codes；The information that information source is sent can through the verification of CRC check device, TPC encoders coding, the modulation of modulator, use LAS codes for the spread spectrum device spread spectrum of spread spectrum multiple access code, the filtering of radio frames framing apparatus framing, finite impulse response baseband filter, the transmitting diversity of STSTD transmission diversity apparatus, be transmitted into channel after the synchronization of sychronisation；What the information that the stay of two nights is received can go that frame device carries out by the synchronization of sychronisation, STSTD receptions diversity, the filtering of matched filter, the radio frames for receiving diversity apparatus go frame, based on the reception diversity that LAS codes are spread spectrum multiple access yard, the despreading of despreading device progress, the demodulation of demodulator, the decoding of TPC iterative decoders based on subcode syndrome, the verification of CRC check device；The CRC. checkers of receiver can feed back HARQ to harq controller to carry out the re-transmission of Error Control and originator.37. device according to claim 28, characterized in that, described emitter may also include radio frames framing apparatus, finite impulse response baseband filter, TPC encoders, modulator, CRC check device, harq controller, sychronisation, STSTD transmission diversity apparatus, power adjustment apparatus；Described receiver may also include radio frames and go frame device, matched filter, the TPC iterative decoders based on subcode syndrome, demodulator, CRC check device, sychronisation, STSTD to receive diversity apparatus；Wherein the subframe of wireless frame structure is made up of LA codes and LS codes；The information that information source is sent can through the verification of CRC check device, TPC encoders coding, the modulation of modulator, use LAS codes for spread spectrum multiple access code spread spectrum device spread spectrum, radio frames framing apparatus framing, finite impulse Channel is transmitted into after the filtering of response baseband filter, the power adjustment of the transmitting diversity of STSTD transmission diversity apparatus, power adjustment apparatus, power adjustment；What the information that the stay of two nights is received can go that frame device carries out by the synchronization of sychronisation, STSTD receptions diversity, the filtering of matched filter, the radio frames for receiving diversity apparatus go frame, based on the reception diversity that LAS codes are spread spectrum multiple access yard, the despreading of despreading device progress, the demodulation of demodulator, the decoding of TPC iterative decoders based on subcode syndrome, the verification of CRC check device；The CRC check device of receiver can feed back HARQ to harq controller to carry out the re-transmission of Error Control and originator.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2002/000143 WO2003077458A1 (en) | 2002-03-11 | 2002-03-11 | Method and device for constructing td-las systems |
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| CN1613221A true CN1613221A (en) | 2005-05-04 |
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| CN02827048.7A Pending CN1613221A (en) | 2002-03-11 | 2002-03-11 | Method and device for constructing TD-LAS system |
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| CN (1) | CN1613221A (en) |
| AU (1) | AU2002238361A1 (en) |
| WO (1) | WO2003077458A1 (en) |
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| CN101692663B (en) * | 2009-08-26 | 2012-05-23 | 北京交通大学 | Symbol Synchronization Method for Wireless Communication System |
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| CN1992574B (en) * | 2005-12-31 | 2011-05-11 | 方正通信技术有限公司 | Method and apparatus for improving networking performance of CDMA communication system |
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| CN1049312C (en) * | 1997-08-12 | 2000-02-09 | 李道本 | Spread spectrum address coding technique |
| WO2001095644A1 (en) * | 2000-06-05 | 2001-12-13 | Linkair Communications, Inc. | A method for the air interface to support variable data rate |
| AU2000249090A1 (en) * | 2000-06-05 | 2001-12-17 | Linkair Communications. Inc. | A framing method and the synchronous wireless system therewith |
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2002
- 2002-03-11 WO PCT/CN2002/000143 patent/WO2003077458A1/en not_active Application Discontinuation
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| CN101692663B (en) * | 2009-08-26 | 2012-05-23 | 北京交通大学 | Symbol Synchronization Method for Wireless Communication System |
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