【摘要】：針對非理想信道環(huán)境下多輸入單輸出(MISO)通信系統(tǒng)中STBC-OFDM信號的盲識別問題,提出了一種基于四階循環(huán)平穩(wěn)的STBC-OFDM信號盲識別算法。該方法首先對MISO通信系統(tǒng)中STBC-OFDM信號進(jìn)行建模;然后利用STBC-OFDM信號編碼矩陣的相關(guān)性,結(jié)合四階循環(huán)平穩(wěn)特性,推導(dǎo)了不同時延向量下接收信號塊的四階循環(huán)矩;最后根據(jù)有無尖峰盲識別空時分組碼的類型。該方法采用分層識別的思想,無需信道系數(shù)、噪聲功率和調(diào)制方式等先驗信息,適合非合作通信場所。仿真結(jié)果表明:算法適應(yīng)于低信噪比的環(huán)境,且不受調(diào)制方式、相位噪聲和多普勒頻移影響,實(shí)用性很強(qiáng)。
[Abstract]:In order to solve the problem of blind recognition of STBC-OFDM signals in multi-input single-output (MISO) communication systems in non-ideal channel environments, a four-order cyclic stationary blind recognition algorithm for STBC-OFDM signals is proposed. Firstly, the STBC-OFDM signal in MISO communication system is modeled, then the fourth order cyclic moment of the received signal block under different time-delay vectors is derived by using the correlation of STBC-OFDM signal coding matrix and the fourth-order cyclic stationary characteristic. Finally, the type of space-time block code is identified according to whether there is a spike or not. This method adopts the idea of hierarchical recognition and does not need prior information such as channel coefficient noise power and modulation mode so it is suitable for non-cooperative communication sites. Simulation results show that the algorithm is suitable for low SNR environment and is not affected by modulation mode, phase noise and Doppler shift.
【作者單位】： 海軍潛艇學(xué)院;91183部隊;
【分類號】：TN911;TN971
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本文編號：2161076