关键词: chu序列, 多输入多输出系统, 正交频分复用, 同步, 多径衰落信道

Abstract:

A fast and reliable technique with high performance for timing and frequency synchronization of multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) system is proposed in multipath fading channel. The synchronization is achieved using shift-orthogonal chu sequence which is simultaneously transmitted from all transmit antennas in the same OFDM time instant. The analysis method gives out better detection properties in terms of higher correct timing detection probability and accurate fractional frequency synchronization. Furthermore, with the help of the proposed algorithm, the integral frequency offset in time domain can be obtained without FFT transform, that will reduce the computation complexity for the synchronization in MIMO-OFDM systems. The valid of the new algorithm is verified in AWGN channel and multipath fading channel in which the first path is not the strongest one.

Key words: chu sequence, multiple-input multiple-output systems, orthogonal frequency division multiplexing, synchronization, multipath fading channel