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A Channel Estimation and Detection Method for Multi-Cell Signals Using the PN Sequence Pilot in Time-Varying Channel Environments  

Kim, Seong-Min (서강대학교 전자공학과 디지털전송연구실)
Chang, Jae-Won (서강대학교 전자공학과 디지털전송연구실)
Sung, Won-Jin (서강대학교 전자공학과 디지털전송연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.33, no.5C, 2008 , pp. 351-360 More about this Journal
Abstract
In cellular mobile radio systems with frequency reuse, the interference signals degrade the channel estimation and signal detection performance due to the low signal-to-interference ratio near coverage boundaries. When the preamble pilot sequences from different cells are orthogonal or located in disjointed positions, they can be used for multi-cell channel estimation and interference cancellation. In time-varying channels caused by Doppler spread, data pilot symbols are needed for channel estimations. However, data pilot symbols are usually located in identical positions for the overhead reduction, which degrades the channel estimation performance. In this paper, we demonstrate a significant amount of performance improvement is achieved by multiplying different pseudonoise(PN) sequences to the data pilot symbols from adjacent interference cells. In particular, for detection scheme using maximal ratio combining(MRC) and inter-cell spatial demultiplexing(ISD), quantitative performance gain of spectral efficiency for different values of Doppler frequency and interference power is presented.
Keywords
Channel estimation; PN sequence; Maximal ratio combining; Inter-cell spatial multiplexing; Time-varing channels;
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