AUTHORS: Huazhang Lv., Jianping Li
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ABSTRACT: Lenstra-Lenstra-Lovász (LLL) is an effective lattice reduction algorithm in multi-input-multi-output (MIMO) system. The use of LLL lattice reduction can significantly improve the performance of zero-forcing and successive interference cancellation decoders in MIMO communications.But for conventional single channel transmission, when the data streams go through poor channel condition, it usually need higher transmission signal noise ratio(SNR) at transmit side to overcome the poor condition and guarantee better receiving performance at receive side.This may be a challenge for designing transmitter and receiver.In this paper, we introduce a multiplex transmission scheme based on LLL algorithm that transmits the same bit streams for multiple times.By means of appling LLL detection and hard decision majority logic decoding to the multi-channel streams of data, the final detection results will reach a lower bit error rate(BER) level at the same SNR. So it needs lower transmit power compared to original single channel transmission. Performance gain will be obtained by this multiplex transmission and majority logic decoding
KEYWORDS: LLL Algorithm, Multiplex Transmission, Majority Logical Decoding, MIMO System
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