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Construction and Blind Estimation of Phase Sequences for SubcarrierPhase Control Based PAPR Reduction in LDPC Coded OFDM Systems
Osamu MUTA
Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Vol.E93A
No.11
pp.21302140 Publication Date: 2010/11/01 Online ISSN: 17451337
DOI: 10.1587/transfun.E93.A.2130 Print ISSN: 09168508 Type of Manuscript: Special Section PAPER (Special Section on Smart Multimedia & Communication Systems) Category: Keyword: OFDM, peaktoaverage power ratio (PAPR), PAPR reduction, LDPC code,
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Summary:
As described in this paper, construction and blind estimation methods of phase sequences are proposed for subcarrierphase control based peaktoaverage power ratio (PAPR) reduction in lowdensity paritycheck (LDPC)coded orthogonal frequency division multiplexing (OFDM) systems. On the transmitter side, phase sequence patterns are constructed based on a given paritycheck matrix. The PAPR of the OFDM signal is reduced by multiplying the constructed phase sequence selected from the same number of candidates as the number of weighting factor (WF) combinations in a partial transmit sequence (PTS) method. On the receiver side, the phase sequence is estimated blindly using the decoding function, i.e., the most likely phase sequence among a limited number of possible phase sequence candidates is inferred by comparing the sumproduct calculation results of each candidate. Computer simulation results show that PAPR of QPSKOFDM and 16QAMOFDM signals can be reduced respectively by about 3.7 dB and 4.0 dB without marked degradation of the block error rate (BLER) performance as compared to perfect estimation in an attenuated 12path Rayleigh fading condition.

