Matched Filter-Based RAKE Combiner for Wideband DS-CDMA Mobile Radio(Special Issue on Third Generation Land Mobile Communication Systems)

概要

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A RAKE combiner based on a matched filter(MF)can be relatively easilyimplemented since the despread signalcomponents that have propagated alongdifferent paths appear sequentially at the MF output. An important design problem is how to accurately select thepaths having sufficiently large signal-to-noise power ratios(SNRs). This paper proposes a simple path selection algorithm that uses two selection thresholds. The first threshold is to select the paths that provide largest SNRs.However, as the total received signalpower(sum of the signal powers of allpaths)decreases, some of the selectedpaths become noisy. Therefore, we introduce a second threshold that discards the noisy or noise-only paths from among those selected by the first threshold. We apply the proposed path selection algorithm to a pilot symbol-assisted coherent RAKE combiner and find bycomputer simulations a nearoptimum set of the two thresholds in frequency selective multipath Rayleighfading channels.Several power delay profile shapes are considered. The simulation results demonstrate that the MF-based RAKE combiner with the two selection thresholds can achieve a bit-error-rate(BER)performance close to the ideal case(i.e., the paths to be used for RAKE combining are selected for each power delay profile such that the required signal energy per information bit-to-noise spectrum density ratio(E_b/N_o)is minimized).
社団法人電子情報通信学会の論文
1998-07-25