Chang C.-YYang Y.-QFan T.-SLee S.-KLee H.-CMAO-CHAO LIN2022-04-252022-04-25202110897798https://www.scopus.com/inward/record.uri?eid=2-s2.0-85114723223&doi=10.1109%2fLCOMM.2021.3109950&partnerID=40&md5=40aeec3b1ee57b9be32fc14b338df62ehttps://scholars.lib.ntu.edu.tw/handle/123456789/607251For an orthogonal frequency division multiplexing (OFDM) communication system which requires channel estimation for each sub-carrier without using pilot signals, there may exist the problem of phase ambiguity. By extending the conventional concept of noncoherent block coding (NBC), we propose a Q-section polar code that has the NBC property in such a way that each codeword is divided into Q sections and reversing the code bits in some sections results in another codeword which is encoded by the same desired message. The polar coded OFDM with a Q-section NBC property enables us to solve the problem of phase ambiguity that exists in each sub-carrier. In addition, the Q-section NBC property also enables us to employ the multiple-candidate method for reducing the peak-To-Average-power ratio (PAPR). ? 1997-2012 IEEE.channel estimationOrthogonal frequency division multiplexing (OFDM)peak-To-Average power ratio (PAPR)phase ambiguitypolar codesFrequency estimationOrthogonal frequency division multiplexingBlock codingCode bitsCoded OFDMPeak to average power ratioPhase ambiguityPilot signalsPolar codesSub-carriersCodes (symbols)journal article10.1109/LCOMM.2021.31099502-s2.0-85114723223