论文标题
循环前缀直接序列扩散光谱的多用户容量，线性检测和预编码
Multi-user Capacity of Cyclic Prefix Direct Sequence Spread Spectrum with Linear Detection and Precoding
论文作者
论文摘要
循环前缀直接序列扩散频谱（CP-DSS）是未来派6G超可靠的低潜伏期通信（URLLC）和大型机器类型通信（MMTC）应用程序的有前途的解决方案。我们建议，在这样的应用中，CP-DSSS波形将以与主网络相同的频率作为辅助网络运行，但在较低的SNR中。在本文中，我们评估CP-DSSS的每个用户容量在上行链路（UL）上执行简单匹配的过滤（MF）时，在下行链路（DL）上使用了时间反转（TR）预编码。在这种情况下，当在低SNR制度下运行时，CP-DSSS实现了接近最佳单用户容量的每个用户容量。随着轮毂/网关的天线数量增加，TR预编码会收敛到最佳容量。使用MF的估计通道脉冲响应和TR几乎没有能力损失。考虑到每个用户的MF检测和TR预编码的近乎最佳性能，可以使用简单的设备收发器结构来实现CP-DSSS，从而降低了大量部署的6G网络的单位成本。
Cyclic Prefix Direct Sequence Spread Spectrum (CP-DSSS) is a promising solution for futuristic 6G ultra-reliable low latency communications (URLLC) and massive machine type communication (mMTC) applications. We propose that in such applications, the CP-DSSS waveform would operate as a secondary network at the same frequencies as the primary network but at much lower SNR. In this paper, we evaluate per-user capacity of CP-DSSS when simple matched filtering (MF) is performed on the uplink (UL) and time-reversal (TR) precoding is used on the downlink (DL). In this setting when operating in the low SNR regime, CP-DSSS achieves a per-user capacity that is near the optimum single-user capacity. TR precoding converges to the optimal capacity as the number of antennas at the hub/gateway increases. Using the estimated channel impulse response for MF and TR introduces little to no capacity loss. Given the near-optimal performance of MF detection and TR precoding for each of the users, CP-DSSS can be implemented with simple device transceiver structures, reducing per-unit cost for massively deployed 6G networks.
