Abstract
In orthogonal frequency division multiplexing (OFDM) systems, high peak to average power ratio (PAPR) is one of its core issues. The OFDM signal with high PAPR passes high-power amplifier (HPA) will result in severely nonlinear distortions, which not only decreases HPA power efficiency, but also increases the whole system's bit error rate (BER). In order to attain the OFDM signal with lower PAPR and better BER, we consider PAPR optimization with error vector magnitude (EVM) constrains in this paper. Different from the second order conic programming (SOCP) scheme with high complexity proposed in the literature, we present an innovative approach based on linearized alterative direction method of multipliers (LADMM) to deal with the PAPR optimization. The proposed LADMM algorithm is a simple and efficient method with FFT/IFFT complexity in every iteration. We also prove LADMM algorithm's convergence and then perform simulations. Simulation results demonstrate that LADMM algorithm not only acquires larger PAPR reduction, but also obtains better BER.
Highlights
As a multi-carrier transmission technique, orthogonal frequency division multiplexing (OFDM) is extensively adopted to next-generation wireless communication systems, because it provides a lot of benefits, such as higher bandwidth efficiency, modulation and demodulation’s implementation by discrete Fourier transform (DFT) and inverse discrete Fourier transform (IDFT), immunity to multipath environments [1]
(2), we develop an innovative approach based on linearized alterative direction method of multipliers (LADMM) [28]–[30] with low complexity to proceed the optimization
The peak to average power ratio (PAPR) reduction with an error vector magnitude (EVM) constraint for OFDM systems is took into account in the paper
Summary
As a multi-carrier transmission technique, orthogonal frequency division multiplexing (OFDM) is extensively adopted to next-generation wireless communication systems, because it provides a lot of benefits, such as higher bandwidth efficiency, modulation and demodulation’s implementation by discrete Fourier transform (DFT) and inverse discrete Fourier transform (IDFT), immunity to multipath environments [1]. The high peak to average power ratio (PAPR) of the transmitted signal is one of the primary flaws of the OFDM systems. The high PAPR makes OFDM to be very sensitive to nonlinear effects touched off by transmitter power amplifier. When the high PAPR OFDM signal is passed through a power amplifier followed a limited linearity, it will give rise to a significant loss of power efficiency, severe in-band distortion and out-of-band noise. Plenty of research works carried out for the issue, and many methods and techniques have been put forward to decrease the PAPR of the OFDM signal.
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