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자료유형
학술저널
저자정보
저널정보
한국통신학회 한국통신학회논문지 한국통신학회논문지 제32권 제9호(통신이론 및 시스템)
발행연도
2007.9
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888 - 894 (7page)

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초록· 키워드

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The computational complexity of a sphere decoder (SD) is conventionally reduced by decoding order scheme which sorts candidate symbols in the ascending order of the Euclidean distance from the output of a zero-forcing (ZF) receiver. However, since the ZF output may not be a reliable sorting reference, we propose two types of sorting schemes to allow faster decoding. The first is to use the newly found lattice points in the previous search round instead of the ZF output (Type Ⅰ). Since these lattice points are closer to the received signal than the ZF output, they can serve as a more reliable sorting reference for finding the maximum likelihood (ML) solution. The second sorting scheme is to sort candidate symbols in descending order according to the number of candidate symbols in the following layer, which are called child symbols (Type Ⅱ). These two proposed sorting schemes can be combined with layer sorting for more complexity reduction. Through simulation, the Type Ⅰ and Type Ⅱ sorting schemes were found to provide 12% and 20% complexity reduction respectively over conventional sorting schemes. When they are combined with layer sorting, Type Ⅰ and Type Ⅱ provide an additional 10-15% complexity reduction while maintaining detection performance.

목차

ABSTRACT
Ⅰ. Introduction
Ⅱ. System Model and Sphere Decoder Algorithm
Ⅲ. Two New Two Types of Candidate Symbols Sorting Schemes and Layer Sorting
Ⅳ. Simulation Results
Ⅴ. Conclution
References

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