Synchronization of MIMO OFDM systems by perfect complete generalized complementary orthogonal loosely synchronous code groups

doi:10.1016/S1005-8885(08)60192-2

Acta Metallurgica Sinica(English letters) ›› 2009, Vol. 16 ›› Issue (2): 1-7.doi: 10.1016/S1005-8885(08)60192-2

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Synchronization of MIMO OFDM systems by perfect complete generalized complementary orthogonal loosely synchronous code groups

WANG Jian, YANG Xun, LI Dao-ben

School of Information Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China

Received:1900-01-01 Revised:1900-01-01 Online:2009-04-30
Contact: WANG Jian

Abstract

Abstract:

This article proposes a time/frequency synchronization algorithm in the multiple input multiple output (MIMO) systems, in which the perfect complete generalized complementary orthogonal loosely synchronous code groups are used as the synchronization sequence. The synchronization algorithm is divided into four stages: 1) synchronization in time domain by signal autocorrelation; 2) synchronization in frequency domain by fast Fourier transform (FFT); 3) multipath dissociation using coherent detection and fine time synchronization; 4) fine frequency offset estimation by phase rotation. As per the perfect complete generalized complementary orthogonal loosely synchronous code groups, the cross-correlation and out-of-phase auto-correlation for any relative shift between any two codes is always zero. This ideal property makes the time/frequency synchronization algorithm simple and efficient. The simulation results show that even in the multipath fast fading channel with low signal noise ratio (SNR), the MIMO system can get synchronized both in the time domain and frequency domain with high stability and reliability.

Key words:

MIMO;OFDM;synchronization;complementary orthogonal code;loosely synchronous (LS) code

WANG Jian, YANG Xun, LI Dao-ben. Synchronization of MIMO OFDM systems by perfect complete generalized complementary orthogonal loosely synchronous code groups[J]. Acta Metallurgica Sinica(English letters), 2009, 16(2): 1-7.

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Synchronization of MIMO OFDM systems by perfect complete generalized complementary orthogonal loosely synchronous code groups

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