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Abstract
Orthogonal frequency-division multiplexing (OFDM) is an attractive multicarrier technique for the simplicity of equalization and high data throughput. However, the transmitted OFDM signal has a very high peak-to-average power ratio (PAPR), which severely degrades the performance of practical OFDM systems and reduces the efficiency of high-power amplifiers (HPA). The selected mapping (SLM) scheme is an effective PAPR reduction method of OFDM signals. However, this approach usually requires side information (SI) transmission, which increases the difficulty of the hardware implementation with high complexity and reduces the data transmission rate. In this paper, based on designing phase rotation vectors in the time domain, a novel blind SLM method with low complexity is proposed to reduce the PAPR of OFDM signals. At the transmitter, the proposed method properly designs the phase rotation vectors in the time domain, which can be considered as an equivalent wireless channel without SI transmission. At the receiver, the effect of phase rotation vectors can be removed by the conventional channel estimation method, and the data demodulation processing can be easily performed by the frequency domain equalization. Simulation results show that the proposed scheme can achieve low complexity in PAPR reduction and has great robustness in bit error rate (BER) performance compared to the other low-complexity SLM PAPR schemes.
Highlights
Orthogonal frequency-division multiplexing (OFDM) is an effective technique for multicarrier systems due to its advantages of simplicity of equalization, high-rate data transmission and robustness against multipath fading
A high peak-to-average power ratio (PAPR) is one of the major problems associated with OFDM multicarrier systems, which may cause a severe degradation of bit error rate (BER) when it passes through a high-power amplifier (HPA) resulting in nonlinear distortion of the OFDM signal [1]
We present a low-complexity blind selected mapping (SLM) PAPR reduction scheme for OFDM signals
Summary
Orthogonal frequency-division multiplexing (OFDM) is an effective technique for multicarrier systems due to its advantages of simplicity of equalization, high-rate data transmission and robustness against multipath fading. In [10], the candidate signals were generated by the linear combinations of the cyclically shifted interleaved partitions of the original OFDM signal This method can achieve satisfactory PAPR reduction performance with greatly reduced computational complexity at the transmitter, but the receiver needs to detect and decode the transmitted side information (SI) with high computational complexity. Based on deriving the general time domain form of the conventional SLM PAPR reduction method, the proposed method properly designs the phase conversion vectors in the time domain at the transmitter as well as using the equivalent channel to perform the frequency domain equalization (FDE) at the receiver without SI transmission. As compared to the conversion vector-based SLM PAPR reduction method in [10], the proposed scheme has low computational complexity in PAPR reduction without the transmission of SI and obtains great robustness of BER performance.
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