An adaptive adjacent channel interference cancellation technique

Abstract

Abstract-In this paper, an adaptive adjacent channel interference (ACI) technique is proposed. Results for BPSK modulation with rectangular and square-root raised-cosine pulse shaping, under AWGN conditions, are obtained showing the proposed method to be effective in improving performance under high levels of interference. Basically, the idea is to send pilot signals and then to use them in estimating the amount of ACI in the frequency domain. The estimated spectral error is used to modify tap weights of an adaptive frequency-domain filter. Our simulation results reported suggest that ACI can be effectively reduced with the proposed technique. At the system level, the requirements of analog front-end channel-select and other filters can be relaxed, resulting in a cost -effective receiver design.

Adjacent Channel Interference Cancellation in FDM Transmissions

“…The adjacent channel interference suppression by a selective application of pre-calculated filters has been published in patent application [23], with the adjacent channel interference detection by a simple energy detector. In [24], the adaptive ACI estimation based on comparing the spectrum of the received signal with the spectrum of known pilot signals has been proposed, thus reducing the overall throughput. The authors of [25] considered a dual satellite communication system with a Volterra filter-based cancellation of first and third order interference terms for narrowband single-carrier signals.…”