Tracking reference signal design for phase noise compensation for SC-FDMA waveform

Abstract

For 5G systems operating in the millimeter-wave range, the impact of the phase noise in oscillators can get higher than that in low band. In 3GPP TSG RAN1 Meeting# 86bis, agreement is achieved that the reference signal for phase tracking is supported for both 5G downlink and uplink. The preliminary design of tracking reference signal (TRS) for orthogonal frequency division multiplexing (OFDM) waveform has been done. But when the same method applies to single carrier frequency division multiple access (SC-FDMA) waveform, the peak-to-average power ratio (PAPR) of transmit signal gets huge growth. Therefore how to design the TRS for SC-FDMA waveform becomes one issue. In this paper, we propose some TRS patterns to track and compensate the phase noise based on SC-FDMA waveform, which fits for practical 5G system. The TRS and data can be mapped in a frequency division multiplexing (FDM) manner, similar as simultaneously physical uplink control channel (PUCCH) and physical uplink shared channel (PUSCH) transmission in LTE. Further the link level performance for different TRS design patterns and generation sequences are discussed, which indicate that using new patterns, the impact of phase noise can be effectively improved with little PAPR growth.