MIMO-OFDM系统中基于循环移位和信号联合的改进SLM算法

doi:10.11959/j.issn.1000-436x.2015088

Abstract

Abstract:

In order to reduce the computational complexity of conventional selective mapping (SLM) algorithm in multiple input multiple output orthogonal frequency division multiplexing (MIMO-OFDM) system，more candidate sequence sets will be produced.With different peak to average power ratio (PAPR) by time domain cyclic shift and signal combination between the antennas.The receiving part can restore the rotation signals by using the sequence selection order of the transmitting part and also the original signals by comparing the inversed rotation sequence with its nearest constellation points.The simulation results show that the proposed method can effectively reduce the PAPR of OFDM signals.In addition，compared with the conventional SLM algorithm，the proposed method can reduce the algorithm computation complexity significantly and obtain similar bit error rate (BER) performance.

Key words: MIMO-OFDM, SLM, PAPR, cyclic shift, signal combination

Wu-jun HU,Lin YANG. Modified SLM algorithm based on cyclic shift and signal combination in MIMO-OFDM system[J]. Journal on Communications, 2015, 36(4): 171-177.

Figures/Tables 9

集合			集合元素
S(1)	x₁	x₂		$\sqrt{1 / 2} (x_{1} + x_{2})$	$\sqrt{1 / 2} (x_{1} - x_{2})$
S(2)	x₁(u₁₁)	x₂		$\sqrt{1 / 2} (x_{1} (u_{11}) + x_{2})$	$\sqrt{1 / 2} (x_{1} (u_{11}) - x_{2})$
S(M²)	x₁(u_1M)	x₂(u_2M)		$\sqrt{1 / 2} (x_{1} (u_{1 M}) + x_{2} (u_{2 M}))$	$\sqrt{1 / 2} (x_{1} (u_{1 M}) - x_{2} (u_{2 M}))$

References 13

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集合数K=9(M=3)	名称	C-SLM	CSC-SLM	CCRR
集合数K=9(M=3)	复数乘	46 080	5 120	88.9 %
	复数加	96 160	19 456	79.8%
K=16(M=4)	复数乘	81 920	5 120	93.8%
	复数加	163 840	26 624	83.8%

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Modified SLM algorithm based on cyclic shift and signal combination in MIMO-OFDM system

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