An Optimal Time-Dependent Receiver for Interference Rejection

这个SBIR项目研究了一种新的创新方法，实现了一种在抑制干扰方面比传统接收器具有更好性能的接收器。改进的干扰抑制允许发射机使用更少的功率来实现所需的误码率性能，从而降低发射机干扰频谱其他用户的概率。这种新的接收机被称为最优时变接收机(OTDR)，它是通过将接收机视为一个时变滤波过程来实现的。OTDR是一种自适应时变滤波器，针对处理不断变化的信号条件和非平稳干扰进行了优化。OTDR的优越性能是通过利用干扰的循环平稳特性获得的。OTDR能够在同一操作中执行下变频、均衡、多径抑制、干扰抑制、波特采样、同步和符号转换。OTDR可以配置为处理各种调制类型，所有这些都只使用很少的或不使用额外的硬件，因此能够支持多种模式。OTDR采用数字信号处理技术实现，硬件体积小、可靠性高、免维护。该SBIR项目的目标是确定OTDR在几种现实商业情况下的理论和实验性能。评估将包括确定OTDR系统设计中的权衡。

This SBIR project examines a new and innovative method of implementing a receiver that has superior performance over that of conventional receivers in rejecting interference. The improved interference rejection allows the transmitter to use less power to achieve the required bit-error rate performance, and hence reduces the probability that the transmitter will interfere with other users of the spectrum. The new receiver, called the optimal time-dependent receiver (OTDR), is developed by considering a receiver as a time-varying filtering process. The OTDR is an adaptive time-varying filter that is optimized to handle changing signal conditions and nonstationary interference. The superior performance of the OTDR is obtained by exploiting the cyclostationary nature of the interference. The OTDR is capable of performing down conversion, equalization, multipath rejection, interference rejection, baud sampling, synchronization, and symbol conversion all within the same operation. The OTDR can be configured to handle a variety of modulation types, all using little or no additional hardware, and thus is capable of numerous and varied modes. The OTDR is implemented using digital signal processing techniques and the hardware can be made small, reliable, and maintenance free. The objective of this SBIR project is to determine the theoretical and experimental performance of the OTDR in several realistic commercial situations. The evaluation will include determining the trade-off in the OTDR system design.