Performance Evaluation of Polar Coded Filtered OFDM for Low Latency Wireless Communications

Abstract

The fifth generation new radio (5G-NR) system design is aimed to have ultra-large transmission rate, massive capacity, massive device connectivity, enhanced mobile broadband (eMBB) services, and ultra-reliable low communication latency (URLLC) services. To support the various challenges and specifications, new wireless communication technologies including new notorious waveforms, forward error correction codes (FEC), non-orthogonal waveforms as well as massive multiple input multiple output (MIMO) antenna schemes have been introduced to aid the progress of pliable 5G air interface system design. Cyclic prefix based orthogonal frequency division multiplexing (CP-OFDM) has been broadly selected in 4G-OFDM based long term evaluation(LTE), Wi-Fi, and other mobile communications due to the benefit of high spectral efficiency, ease of development and easy to integrate with MIMO systems, etc. However, the conventional CP-OFDM technology has some drawbacks, such as high out of band (OOB) emission leakage, an exact requirement of synchronization, and a limited number of CP lengths. Filtered OFDM (FOFDM) is a flexible foundational waveform by applying subband filtering on existing CP-OFDM which can support the needs of the waveform for 5G air interface. In this paper, a spectrally efficient waveform called polar coded filtered OFDM (PC-FOFDM) is proposed to fulfil these requirements for high data rate ultra-reliable low latency communications. This paper investigates bit error rate (BER) performance of PC-FOFDM scheme over additive white Gaussian noise (AWGN) channel and compares the results with PC-OFDM. The simulation results show that the PC-FOFDM scheme outperforms PC-OFDM in terms of spectrum efficiency, BER performance, and error vector magnitude (EVM).