Abstract
For 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).
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