Real Time Noise Power Estimation for Single Carrier Frequency Domain Equalization

Abstract

Wireless broadband high-speed data transmission technology is one of the key technologies used to realize mutual communication between various unmanned vehicles, unmanned ships and unmanned aerial vehicles in the future civil and military fields. Since data transfer rate is continuously increasing and the multipath effect of the near-earth channel brings frequency selective fading, the receiver usually uses an adaptive equalizer to eliminate inter-symbol interference (ISI). Instead of the time-domain-equalization methods commonly used in current engineering implementations, in this article, we use the frequency-domain MMSE equalization algorithm to give a realtime accurate estimation method for the “noise power” coefficient in the equalizer parameters during engineering implementation. In this article, we will explain the system design and demodulation methods required for real-time noise estimation based on frequency-domain MMSE equalization, and discuss the performance advantages over time domain equalization without increasing the complexity of the algorithm. It is demonstrated that it can be better applied to high-speed data communication under multipath fading channels. The algorithm is verified through computer simulation and field measurement.