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Identification of PCP-OFDM Signals at Very Low SNR for Spectrum Efficient Communications

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Executive Summary

An adaptive Orthogonal Frequency Division Multiplexing (OFDM) system, with a Precoded Cyclic Prefix (PCP), was proposed earlier to address the recent need of robust and flexible transmission technique in Cognitive Radio (CR) communications. Identification of PCP-OFDM signals is therefore of great importance for the design of fair spectrum sharing mechanism, particularly at very low Signal-to-Noise Ratio (SNR)when synchronization is not achievable. The precoded cyclic prefix, multiplexed with the data-carrying OFDM signals, provides one unique and recognizable feature of PCP-OFDM signals. In this paper, a robust PCP-OFDM signal identification technique is proposed under very low SNR in the presence of unknown timing and Carrier Frequency Offset (CFO).

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