Receiver design for UW-GFDM systems
Siva Prasad Valluri, V. V. Mani · 2018
The unique word generalized frequency division multiplexing (UW-GFDM) is a newly proposed signalling scheme that uses redundant subcarriers in order to obtain better performance in terms of bit error rate (BER). The used redundant symbols will depend on actual payroll data and thus introducing correlation in frequency domain. However, the suggested linear system model in literature utilize sophisticated detectors for performing data recovery. In this paper, we propose two receiver structures using sphere decoding (SD) and Weiner noise interpolation (NI). When compared with linear receivers, SD is able to use the correlations on redundant subcarriers and maintain a good BER gain. We observe the error samples obtained after the linear data estimation are correlated with each other. In second receiver, we use the already known data decisions along with NI to further exploit frequency domain correlations. The receiver designed using NI clearly outperforms the prior method in both additive white Gaussian noise (AWGN) and multipath fading channels. In addition, this paper compares the performance of all the variants of GFDM and makes interesting conclusions for their utilization in 5G communication.