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Fig. 1 NC-OFDM Transceiver. (b). Fig. 2 NC-OFDM Receiver. (a). Fig. 4 Subcarrier Phase Adjustment Algorithm. Fig. 8 NC-OFDM Transceiver. Fig. 5 Sequential Phase Grouping Method. Fig. 9 NC-OFDM Receiver. Fig. 6 Proposed Phase Grouping Method. (a). (b).
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Fig. 1 NC-OFDM Transceiver (b) Fig. 2 NC-OFDM Receiver (a) Fig. 4 Subcarrier Phase Adjustment Algorithm Fig. 8 NC-OFDM Transceiver Fig. 5 Sequential Phase Grouping Method Fig. 9 NC-OFDM Receiver Fig. 6 Proposed Phase Grouping Method (a) (b) Fig. 7 Adaptive-Mode PAPR Reduction Algorithm Peak-to-Average Power Ratio Reduction in MPSK-OFDMRakesh Rajbanshi and Gary Minden (rajbansh, gminden@ittc.ku.edu) Introduction Subcarrier Phase Adjustment • Discrete version of the complex envelope of a baseband OFDM signal, consisting of N subcarriers is given by: • The peak-to-average power ratio (PAPR) of the signal is: where, E{.} denotes the expectation operator • When high PAPR occurs, dynamic range for power amplifiers, ADCs, and DACs would be required to be sufficiently large to avoid amplitude clipping. Fig. 3 Maximum PAPR reduction (a) when receiver has the complete information about the phase update (b) grouping the phase updates over several subcarriers (Probability of 1, p=0.90) PAPR Reduction Algorithms Adaptive-Mode PAPR Reduction Fig. 10 CCDF of BPSK OFDM signal PAPR with phase updating and random interleavers
