论文部分内容阅读
研究了短波OFDM调制下多天线分集合并接收技术。针对短波信道存在多径干扰、深衰落、多普勒频移等特点,采用ITU-R建议的中纬度恶劣信道条件下的短波信道参数,应用短波Watterson信道模型,运用最大比值合并的多天线分集合并算法,进行了短波OFDM系统下误码率性能仿真。仿真结果表明:设计的算法,在不加大发射功率的情况下,有效地降低了OFDM系统的误码率,减轻了信道衰落的影响,提高了通信的可靠性。
The multi-antenna diversity combining and receiving technology under short-wave OFDM modulation is studied. According to the characteristics of short-wave channel such as multi-path interference, deep fading and Doppler shift, the short-wave channel parameters in the mid-latitude harsh channel proposed by ITU-R are used. The shortwave Watterson channel model and the maximum ratio combined multi-antenna diversity Combining the algorithm, the error rate performance simulation of the short-wave OFDM system was carried out. The simulation results show that the proposed algorithm can effectively reduce the bit error rate (BER) of OFDM system and reduce the impact of channel fading without increasing the transmit power, which improves the reliability of communication.