Abstract
We propose a modified transform domain communication system (TDCS) structure with weighted fractional Fourier transform (WFRFT) preprocessing over the channel with additive white Gaussian noise (AWGN) and narrowband interference (NBI). The majority of NBI can be removed by adding zeros to TDCS’s basic function (BF) amplitude vector at these subcarriers where strong NBI exists, and the corresponding residual NBI can be further greatly eliminated in time-frequency domain through WFRFT processing. To achieve the best bit error rate (BER) performance, we defineγas the normalised cross relationship coefficient between TDCS’s BF vector and residual NBI vector and prove that the corresponding WFRFTαoptcan be obtained by minimising the magnitude ofγ. Numerical simulations are conducted to evaluate the proposed system’s performance with regard to NBI suppression.
Highlights
In current carrier schemes, multicarrier (MC) and single carrier (SC) communication systems have become the two major techniques
The hybrid carrier (HC) system based on weighted-type fractional Fourier transform (WFRFT) is an inspiring attempt which can make a tradeoff between SC and MC
As for Rx, due to the corresponding inverse prepressing modules for transform domain communication system (TDCS) and WFRFT, the original transmitting signal x can be recovered to the most extent. When it comes to narrowband interference (NBI), the preprocessing matrix Q can eliminate the major part of NBI and further make the corresponding residual NBI dispersed in the time-frequency domain
Summary
Multicarrier (MC) and single carrier (SC) communication systems have become the two major techniques. Considering that OFDM and SC techniques have their individual advantages and disadvantages, researchers have done many attempts to converge these two carrier schemes [2,3,4,5]. The time-frequency distribution characteristics can greatly help mitigate intercarrier interference/intersymbol interference (ICI/ISI) [6] in additive white Gaussian noise (AWGN) or doubly selective channels [7] as long as the WFRFT order α is set properly. The OFDM-based communication systems are subject to the interference caused by narrowband interference (NBI), which has long attracted many researchers’ attention [15, 16]. It is necessary to carry out research on NBI suppression in WFRFT-based systems
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