  Reduced complexity faster-than-Nyquist (FTN) signaling systems are gaining
increased attention as they provide improved bandwidth utilization for an
acceptable level of detection complexity. In order to have a better
understanding of the tradeoff between performance and complexity of the reduced
complexity FTN detection techniques, it is necessary to study these techniques
in the presence of channel coding. In this paper, we investigate the
performance a polar coded FTN system which uses a reduced complexity FTN
detection, namely, the recently proposed successive symbol-by-symbol with
go-backK sequence estimation (SSSgbKSE) technique. Simulations are performed
for various intersymbol-interference (ISI) levels and for various go-back-K
values. Bit error rate (BER) performance of Bahl-Cocke-Jelinek-Raviv (BCJR)
detection and SSSgbKSE detection techniques are studied for both uncoded and
polar coded systems. Simulation results reveal that polar codes can compensate
some of the performance loss incurred in the reduced complexity SSSgbKSE
technique and assist in closing the performance gap between BCJR and SSSgbKSE
detection algorithms.
