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In this paper, a modified clipping and filtering scheme is proposed for improving the peak-to-average power ratio (PAPR) reduction performance of conventional repeated clipping and filtering (RCF) scheme in orthogonal frequency division multiplexing (OFDM) systems. The main idea is based on dividing the input OFDM symbol into even-index part and odd-index part for independent processing of clipping...
This paper proposes a low complexity peak-to-average power ratio estimation scheme for OFDM systems. The new scheme introduces a non-equal-distance estimation based on triangle interpolation, which approximates higher oversampling samples by lower oversampling samples. Simulation shows the new scheme can achieve a good approximating to signal distribution of the real over-sampled OFDM signal. Furthermore,...
Partial transmit sequence (PTS) is an attractive distortless peak-to-average power ratio (PAPR) reduction technique for orthogonal frequency division multiplexing (OFDM) system. However, the complexity of PTS increases exponentially with the number of sub-blocks as it requires an exhaustive searching over all phase factor combinations. In this paper, we explored the correlation among the multiple...
To overcome the PAPR problem of conventional orthogonal frequency-division multiplexing (OFDM) system, a significant amount of methods have been proposed. However, there are few literatures considering the PAPR reduction for uplink orthogonal frequency division multiple access (OFDMA) system. In this paper, we focus on the PAPR reduction for random interleaved uplink OFDMA system. Firstly, the conventional...
High peak to average power ratio (PAPR) is one of the main disadvantages of OFDM. Clipping can reduce the PAPR but suffers from high out-of-band distortion. Recently, peak cancellation is introduced to reduce the out-of-band radiation with a band-limited cancellation function. In this paper, a set of windowing function is applied as the cancellation function. Furthermore, the cancellation function...
This paper presents a low complexity peak-to-average power ratio (PAPR) reduction technique in interleaved orthogonal frequency-division multiple access (OFDMA) system. The basic idea is to explore the special structure of interleaved OFDMA so as to reduce the computational complexity for PAPR reduction. Current PAPR reduction techniques can be combined with the proposed structure, and repeated clipping...
Selected mapping (SLM) is a promising peak-to-average power ratio (PAPR) reduction technique for orthogonal frequency division multiplexing (OFDM) system. In SLM, phase sequences are combined with the data for generating alternative signals, so as to reduce the PAPR. In this paper, a new criterion is developed to examine the effects of different phase sequence sets in SLM-OFDM based on the mathematical...
Partial transmit sequence (PTS) is a promising technique for reducing the high peak-to-average power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM) systems. In PTS, multiple candidate signals are generated and the optimal signal with the lowest PAPR is selected for transmission. One drawback of PTS is that parts of the candidate signals are strongly correlated so as to degrade the...
High peak-to-average power ratio (PAPR) is one of the main drawbacks of MC-CDMA system. Among current methods that aim at reducing PAPR, partial transmit sequence (PTS) and variable code sets (VCS) are the kind of schemes that can improve PAPR statistics effectively but with large search complexity. To overcome this disadvantage, in this paper, we investigate a PAPR reduction scheme which employs...
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