论文标题
比nyquist信号更快的残留肌层干扰脉冲
Pulses with Minimum Residual Intersymbol Interference for Faster than Nyquist Signaling
论文作者
论文摘要
比Nyquist信号更快，通过接受隔膜间干扰来提高脉冲振幅调制的频谱效率，在接收器处需要均衡器。由于最佳均衡器的复杂性随着干扰符号的数量呈指数增长，因此实用的截断均衡器假设内存较短。所得残留干扰的功率取决于发射滤波器，并限制了截短均衡器的性能。在本文中，我们使用数值优化和倾斜的球形波函数来找到最佳的时间限制脉冲，以达到最小残留干扰。与根凸起的余弦脉冲相比，新的脉冲减少了残留的干扰，例如，对于一个均衡器而言，可以实现32 dB的降低，该均衡器认为以57％的传播为57％的四个干扰符号。作为概念的证明，对于二进制符号的57％传输，我们表明，与使用128稳定均衡器的根凸起的余弦脉冲相比，使用4状态均衡器的新脉冲具有更好的位错误率性能。
Faster than Nyquist signaling increases the spectral efficiency of pulse amplitude modulation by accepting intersymbol interference, where an equalizer is needed at the receiver. Since the complexity of an optimal equalizer increases exponentially with the number of the interfering symbols, practical truncated equalizers assume shorter memory. The power of the resulting residual interference depends on the transmit filter and limits the performance of truncated equalizers. In this paper, we use numerical optimizations and the prolate spheroidal wave functions to find optimal time-limited pulses that achieve minimum residual interference. Compared to root raised cosine pulses, the new pulses decrease the residual interference by an order of magnitude, for example, a decrease by 32 dB is achieved for an equalizer that considers four interfering symbols at 57% faster transmissions. As a proof of concept, for the 57% faster transmissions of binary symbols, we showed that using the new pulse with a 4-state equalizer has better bit error rate performance compared to using a root raised cosine pulse with a 128-state equalizer.
