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Sidelobe suppression and peak to average power ratio (PAPR) reduction are two main problems in NC-OFDM systems. The conventional research treat these two problems as two independent problems and our research focus on the general performance improvement in terms of the two problems. In this paper, the interactive impacts of these two issues are analyzed based on two joint processing models. Furthermore,...
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...
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...
The high peak-to-average power ratio (PAPR) is one of the main drawbacks of multicarrier code division multiple access (MC-CDMA) system. To alleviate this problem, in this paper, we propose a novel user grouping scheme for PAPR reduction in the downlink of MC-CDMA. The basic principle is to partition the users into subgroups, and generate multiple alternatives to achieve considerable PAPR reduction...
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...
The PAPR problem is one of the main drawbacks in MC-CDMA system. Variable Code Sets (VCS) can improve the PAPR property of the MC-CDMA signals. However, VCS technique requires an exhaustive search over the combinations of allowed spreading code sets. When the number of active users increases, the search complexity will increase exponentially. In this paper, we propose a low complexity VCS (LC-VCS)...
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