A Low Complexity Tone Reservation Scheme Based on Time-Domain Kernel Matrix for PAPR Reduction in OFDM Systems

Abstract

The peak-to-average power ratio (PAPR) problem is a main challenge for orthogonal frequency division multiplexing systems. In this paper, the proposed scheme reduces the PAPR with low complexity, by utilizing the time-domain kernel matrix to generate the peak reduction signals. With the time-domain kernel generated only once or offline, there are no IFFT/FFT operations in the peak reduction iterations. Also, we performed simulations and results indicated that the algorithm converges to the threshold in about three iterations, so the hardware complexity and time complexity of this scheme are relatively low to achieve a comparable peak reduction as some other tone reservation schemes.Index Terms-Orthogonal frequency division multiplexing (OFDM), peak-to-average power ratio (PAPR), time-domain kernel, tone reservation (TR).

Optimization of Tone Reservation-Based PAPR Reduction for OFDM Systems

“…A thorough overview of the fundamentals of TR methods are presented in [9], whereas recent studies show advances in both kernel based [8], [10], and clipping-based TR [11], [12]. A brief summary of both schemes is given in the following subsections.…”

“…Two methods are presented in the literature for TR [9]: the kernel-based TR [8], [10], and the clipping-based TR [11], [12]. Both methods yield suboptimal performance for TR-based PAPR reduction.…”

Novel Peak-to-Average Power Ratio Reduction Methods for OFDM/OQAM Systems

“…In OFDM/OQAM systems, the real input signal needs to go through a pre-modulator and a filter before and after the IFFT operation. If the IFFT operation is carried out on a frequency domain data block containing only ones and zeros, the IFFT output signal is an impulse-like signal waveform [22], and reaches its peak at n = 0.…”

Improved TKM-TR methods for PAPR reduction of DCO-OFDM visible light communications

“…In RF-OFDM systems, another popular technique in reducing the PAPR is the tone reservation (TR) scheme, which is regarded as a distortionless technique and hence attracts considerable interests. According to the derivation in [14], the PAPR reduction problem in conventional RF OFDM system was formulated as a quadratically constrained quadratic program (QCQP) problem [15]. A signal to clipping noise ratio (SCR) maximization based on TR (SCR-TR) method [14] was proposed to deal with this optimization problem by using the gradient algorithm.…”

“…However, one drawback of SCR-TR is its slow convergence speed. To accelerate the convergence speed and reduce the computational complexity, several improved TR methods were proposed in [15][16][17][18], among which the TKM-TR algorithm [15] owned much better PAPR reduction performance and lower complexity. Moreover, an enhanced TKM-TR scheme [19] was applied to the RF-OFDM system to address the problem of the peak regrowth, however, the result still seems not so satisfied after multiple iterations.…”