【摘要】 构造一种在所有正交频分复用(OFDM)符号中使用同一PN序列作为保护间隔的时域同步OFDM信号格式,提出一种基于快速傅里叶变换的PN码干扰消除和信号检测算法,该算法不使用FIR均衡技术,复杂度低,仅与常规CP-OFDM信号检测算法的复杂度相当,但由于引入了部分保护间隔内的噪声,因此BER性能不如CP-OFDM系统。仿真结果表明,在典型的双径短波信道中,两者的BER性能差距小于0.1dB,在信道时域扩展较大的四径短波信道中,两者的BER性能差距小于1dB。更多还原

【Abstract】 A new Orthogonal Fre-quency Division Multiplexing(OFDM) signal structure is constructed by using the same PN sequence as guard interval for Time Domain Synchronous Orthogonal Fre-quency Division Multiplexing(TDS-OFDM) system. A low- complexity PN subtraction and signal detection algorithm is proposed based on FFT. The complexity of the algorithm is similar to that of the regular Cyclic Prefix OFDM(CP-OFDM) without complex FIR equalizer. Because some noises in guard interval are introduced to the signal detection, the BER performance of the algorithm degrades compared with that of CP-OFDM. Simulation results show that their BER performance difference is less than 0.1 dB in typical 2-path HF channel, while the performance difference is less than 1 dB in 4-path HF channel whoes time spread is relatively large.更多还原