论文部分内容阅读
1975年MAZO提出超Nyquist码元速率(FTN)理论,通过理论推导证明,信号在加性高斯白噪声信道下,以超过Nyquist码元速率25%以内的速率进行传输,误码性能可以不下降。但MAZO以及至今都没人能完成FTN的接收,因为当信号以超Nyquist码元速率进行传输所引起的码间串扰长度无限长,若要完全消除码间串扰,使用最大似然检测(MLSE)方法,其复杂度无穷大,是不可实现的。基于MMSE均衡和WCE均衡级联的两级均衡已证明在长码间串扰信道下其误码性能接近于MLSE。文章将两级均衡运用于FTN接收,仿真证明在加性高斯白噪声信道下,信号以超过Nyquist码元速率25%以内的速率进行传输,误码性能不下降。成功实现FTN的接收,验证了MAZO的理论。
In 1975, MAZO proposed the theory of ultra-Nyquist symbol rate (FTN). Theoretically, it proves that the signal can be transmitted within 25% of Nyquist symbol rate in additive white Gaussian noise channel, and the error performance can not be reduced. However, no one has been able to accomplish the reception of FTN so far, since the length of intersymbol interference caused when the signal is transmitted at the super Nyquist symbol rate is infinite. To completely eliminate intersymbol interference, maximum likelihood detection (MLSE) Method, its complexity is infinite, is not achievable. The two-stage equalization based on the MMSE equalization and the WCE equalization cascade has proved that its BER performance is close to that of MLSE under long crosstalk crosstalk. In this paper, two levels of equalization are applied to FTN reception. The simulation results show that the signal is transmitted at a rate exceeding 25% of the Nyquist symbol rate in the additive white Gaussian noise channel, and the error performance is not degraded. The successful reception of FTN verified the theory of MAZO.