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Ruike and equalization cascade receiving method under the code division multiple address low band-spreading ratio and its equipment

A code division multiple access and rake receiver technology, which is applied in the field of multipath diversity reception and soft output Viterbi equalization algorithm, can solve the problems that RAKE receivers cannot achieve the effect, low spreading ratio, and affect the performance of RAKE receivers, etc. , to achieve the effect of overcoming the deterioration of system performance, satisfying high-speed data services, and simple calculation

Inactive Publication Date: 2002-09-04
SOUTHEAST UNIV +1
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AI Technical Summary

Problems solved by technology

However, to support higher data rates, a smaller (lower) spreading ratio must be used
At this time, inter-symbol interference seriously affects the performance of the RAKE receiver, even in the case of high SNR, the RAKE receiver cannot achieve the desired effect

Method used

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  • Ruike and equalization cascade receiving method under the code division multiple address low band-spreading ratio and its equipment
  • Ruike and equalization cascade receiving method under the code division multiple address low band-spreading ratio and its equipment
  • Ruike and equalization cascade receiving method under the code division multiple address low band-spreading ratio and its equipment

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Embodiment Construction

[0020] Each composition in the invention is discussed separately below.

[0021] 1. Channel parameter estimator module (B100):

[0022] The pilot frequency (Pilot) channel in the CDMA system is used to transmit the pilot sequence known in advance, which can be used for system timing and carrier extraction, channel estimation, handover, etc. If the system transmits signals of several code channels shown in the following formula at the same time, Among them, the i-th item corresponds to the equivalent baseband signal of the i-th code division channel; d i (n) is the symbol sequence sent by the i-th code channel; w i (t) Orthogonal Walsh sequence number i specified for the i-th code channel, its value is only in the range of 0s Take a non-zero value in the interval; pn(t) is a pseudo-random spread spectrum sequence; T s，i The symbol interval sent for the i-th code channel. Item x for i=0 0 (t) corresponds to the Pilot channel. Without loss of generality, it can be assumed ...

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Abstract

A receiving emthod and device of rake and equalizing cascade under the low spread spectrum ratio of code division multiple address is based on the receiving method and device of rake receiving and mutual cascade honycomb. The cascade method and divice not only can carry out consolidated receiving of effective multipass signal but also can counterbalance the interference in between symbols caused by multipath signal and especially good for high speed transmission of CDMA system under low spread spectrum ratio. It includes basically rake receiver and soft exporting equalizer for making rake receiving and estimating channel parameters of multipath fading first, and then to calculate ISI coefficient of interference in between symbols within equivalent time varying according to channel parameter and effective pass position, at least to realize equalizing calculation of soft exporting witte ratio. It is testified by computer simulation test that the high speed data transmission performacne of third generation mobile communication system can be mush improved under the condition of not to increase calculatino quantity mush.

Description

1. Technical field: [0001] The invention belongs to the technical field of realizing multipath diversity reception and soft output Viterbi equalization algorithm in a CDMA (Code Division Multiple Access) cellular communication system. 2. Background technology: [0002] CDMA cellular communication technology shows great development potential due to its simple frequency planning, large system capacity, strong anti-multipath ability, good communication quality, and low electromagnetic interference. It will be the mainstream technology of the third-generation mobile communication in the future. CDMA spread spectrum signal receivers are divided into coherent receivers and non-coherent receivers. The coherent receiver needs to know the phase information of the received signal, while the non-coherent receiver does not need to know the phase information of the received signal, but requires the transmitted signal to be in a quadrature modulation mode. There is multipath fading pheno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/06H04B1/7115
Inventor 尤肖虎许昌龙马章勇蒋良成缪开济
Owner SOUTHEAST UNIV
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