MIMO DS/CDMA系統(tǒng)中基于信號周期平穩(wěn)特性的頻偏盲估計算法
A Blind Frequency Offset Estimating Based on the Signals Cyclostationarity in MIMO DS/CDMA System
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摘要: MIMO DS/CDMA通信系統(tǒng)中，每對收發(fā)天線間的載波頻偏各不相同，這使得頻偏估計變得異常困難。該文基于DS/CDMA信號的周期平穩(wěn)特性提出了一種適用于該系統(tǒng)的頻偏盲估計算法。該算法主要特點在于：(1)它能夠分別估計每對收發(fā)天線間的載波頻偏；(2)綜合利用了信號在所有非零周期頻率處的周期自相關函數(shù)值；(3)它是一種盲估計算法，不需要專門的訓練序列，不會降低系統(tǒng)的帶寬利用率。仿真結果表明在FIR信道模型下，該算法能夠準確地估計出系統(tǒng)中各個收發(fā)天線對間的載波頻偏。Abstract: In MIMO DS/CDMA systems, the different transmit/receive antenna pairs have different frequency offset, which increases the complexity of the frequency offset estimating. Based on the cyclostationarity of the signal, a blind frequency offset estimating is proposed in this paper. The advantages of the estimating are: (1) It can separately estimate the frequency offset of the different antenna pair; (2) It is a blind estimator and does not need training sequence which lower the efficiency of the wireless bandwidth; (3) It can fully utilize the cyclic correlation of the received signal at all nonzero cyclic frequency. The simulation results provided in this paper show that the estimating has good performance in the FIR channel environment.
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Hong Dae-Ki, Lee Young-Jo, Hong Daesik, Kang Chang-Eon. Robust frequency offset estimation for pilot symbol assisted packet CDMA with MIMO antenna systems[J].IEEE Communi- cations Letters.2002, 6(6):262-[3]Gini Fulvio, Giannakis Georgios B. Frequency offset and symbol timing recovery in flat-fading channels: A cyclostationary approach[J].IEEE Trans. on Commun.1998, 46(3):400-[5]Wang Y, Serpedin E, Ciblat P, Loubaton P. Performance analysis of a class of nondata-aided frequency offset and symbol timing estimators for flat-fading channels[J].IEEE Trans. on Signal Processing.2002, 50(9):2295- -
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