基于扩频通信的伪随机码时间反演多址通信

针对传统时间反演多址技术(time-reversal division multiple access, TRDMA)因用户信道冲激响应空间相关性无法完全正交所引起的多址干扰(multiple access interference,MAI)问题，提出了一种基于扩频通信的伪随机码时间反演多址通信(pseudo-noise code time-reversal division multiple access, PNTRDMA)。该方法在传统TRDMA的基础上，通过在发端为不同用户分配正交的伪随机码，在接收端配备相对应伪随机码对信号进行进一步区分，提高了用户在信道冲激响应空间相关性较高情况下系统的可靠性。通过仿真对PNTRDMA与TRDMA在普通情况下和极端情况下的误码率进行分析，并对PNTRDMA在不同参数情况下的误码率情况进行了分析。仿真结果表明，PNTRDMA能够有效减小MAI，降低系统误码率(bit error rate, BER)。

Pseudo-noise code time-reversal division multiple access communication based on spread spectrum communication

For the multiple access interference (MAI) inherent in traditional time-reversed multiple access (TRDMA), this paper proposes a pseudo-noise code time-reversal division multiple-access communication (PNTRDMA) based on spread spectrum communication. Based on the traditional TRDMA, by assigning orthogonal pseudo-random codes to different users at both the transmitting end and the corresponding receiving end, the signals are further distinguished at the receiving end, which improves the reliability of the system in high user space channel correlation. In this paper, the bit error rate (BER) of PNTRDMA and TRDMA under normal and extreme conditions is analyzed by simulation, and the error rate of PNTRDMA under different parameters is analyzed. The simulation results show that PNTRDMA can effectively reduce the MAI and the system bit error rate.