Channel estimation method and system in multi-carrier CDMA system

Abstract

The invention discloses a method for estimating a channel of a multi-carrier code division multiple access system, which comprises the steps: A. a pilot symbol and a spread-spectrum symbol are mapped by a sender to a sub-carrier which bears a orthogonal frequency division multiplexing (OFDM) symbol; the pilot symbol and the spread-spectrum symbol are carried out time division multiplexing and transmission processing and sent to a receiver; B. a current first frequency response of the channel is determined by the receiver according to the preserved and received pilot symbol; C. the received spread-spectrum symbol is carried out a channel pre-equalization processing by the receiver according to the current first frequency response of the channel; D. the spread-spectrum symbol is carried out a spread-spectrum code despeading processing by the receiver; the service OFDM symbol is carried out a channel equalization processing. The invention solves the problem of that low accuracy of the channel estimation algorithm caused by a phase rotation of the information borne by the sub-carrier of the multi-carrier code division multiple access system which is generated by complex multipath components. The invention also discloses a channel estimation system for the multi-carrier code division multiple access system at the same time.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to a channel estimation method and system of a multi-carrier code division multiple access system. Background technique [0002] Multi-Carrier Code Division Multiple Access (MC-CDMA) technology is a multiple access technology that combines Code Division Multiple Access (CDMA) technology and Orthogonal Frequency Division Multiplexing (OFDM) technology. In terms of implementation, the structure of the MC-CDMA system is very similar to that of the OFDM system. The difference is that each subcarrier in the OFDM system carries different information, while some subcarriers in MC-CDMA carry the same information. Completed. The channel estimation and equalization of MC-CDMA can be completed by using pilot symbols interleaved on subcarriers, or by a pilot code channel on CDMA. Implementing channel estimation and equalization on the code channel can avoid the overhead of a large number o...

AI Technical Summary

Problems solved by technology

[0053] The present invention provides a channel estimation method and system for a multi-carrier code division multiple access system, which is used to solve the problem in the prior art that the complex multipath components cause the phase rotation of the subcarrier information carried by the multi-carrier code division multiple access system, resulting in The Problem of Low Accuracy of Channel Estimation Algorithms

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