PAPR Reduction of SC-FDMA Signals Via Probabilistic Pulse Shaping

Abstract

To avoid the excess bandwidth and noise enhancement penalty involved in the pulse shaping method for peak-toaverage power ratio (PAPR) reduction of single carrier frequency division multiple access (SC-FDMA) signals, we propose a novel alternative method, called probabilistic pulse shaping. A set of weighting windows with zero excess bandwidth is designed to weight the outputs of the discrete Fourier transform (DFT) precoder of a block of SC-FDMA symbols in a slot. Then the candidate signal blocks with different weighting windows for each block are generated with the designed low-complexity implementation scheme and the one with the lowest PAPR is selected to be transmitted. At the receiver, the received data can be detected in the same way as that of the conventional SC-FDMA using the defined equivalent channel without side information. It is shown by simulations that the proposed method achieves considerable improvements over the conventional SC-FDMA system in terms of both PAPR and bit error rate (BER) performance with low additional complexity.Index Terms-Peak-to-average power ratio (PAPR), pulse shaping, single carrier frequency division multiple access (SC-FDMA), discrete Fourier transform (DFT) precoder.

Pilot Design for BEM-Based Channel Estimation in Doubly Selective Channel

“…Note that after optimization, the data length is different in each sub-block (unlike periodic placement case where each sub-block has data length of 22). Finally, the pilot positions obtained by optimizing the simplified BEM-MSE in (31) are given as [n ⋆ 1 = 8, n ⋆ 2 = 48, n ⋆ 3 = 92]. Fig.…”

“…. On the other hand, the simplified BEM-MSE in (31) involves B of dimension (Q + 1) × (Q + 1) only. Thus, the simplified BEM-MSE expression allows us to optimize the pilot parameters with much lower complexity, which will be used to serve as a benchmark against another low-complexity algorithm proposed in Section V.…”

“…This leads to very high power per pilot symbol, which in turn, can drive the transmitter power amplifier into its non-linear operating region, thus degrading the CE quality. Notice that PAPR problem may arise in SC systems due to other reasons such as modulation and pulseshaping [31], but here we consider the PAPR problem arising from the impulse-based TDKD pilot structure.…”

A Novel Joint Scheme of PAPR Reduction and BER Performance Enhancement in Interleaved DCT-SCFDMA System

“…A few bit errors are introduced to modify the few complex modulated symbols of each data SC-FDMA symbol in a sub-frame is proposed to reduce the PAPR but the BER performance is slightly degraded [3]. Jinwei et al proposed a method, where a set of weighting windows with zero excess bandwidth is designed and finally candidate signal block with the lowest PAPR is selected to be transmitted [4]. In this methodology, side information is not required for data detection at the receiver and potential to be applicable in SC-FDMA systems with high order modulations.…”

A CCM‐Based OFDM System with Low PAPR for Sparse Source

“…To solve this problem, many PAPR reduction techniques have been proposed in recent few years. These techniques can be classified into three categories [10]: multiple signaling and probabilistic techniques [11][12][13], coding techniques [14], and signal distortion techniques [15][16][17][18][19]. In general, the first two categories, that is, the multiple signaling and probabilistic techniques and coding techniques, do not increase the bit error rate (BER), but they involve high computational complexity and data rate loss [10].…”