Adding signal for peak‐to‐average power reduction and predistortion in an orthogonal frequency division multiplexing context

Abstract

International audienceIn this study, the authors look into digital predistortion and its combination with the peak-to-average power ratio (PAPR) reduction technique in the case of orthogonal frequency division multiplexing (OFDM)-based systems. First of all, the authors propose a new predistortion methodology which uses the addition of signals. Two different algorithms are investigated for the predistortion signals generation. The first one is based on the traditional predistortion method, where an estimation of the power amplifiers (PAs) characteristics is needed in the first place. The second algorithm to generate the predistortion signal does not need a priori PA estimation. It is based on an iterative compensation of the error between the amplified signal and the OFDM signal. Then, the authors combine this latter algorithm with the tone reservation PAPR reduction method in order to have a global adding signal expression. Two combination scenarios of PAPR reduction and predistortion obtained by means of adding a signal are proposed. The first one combines both of them in series while the second one is parallel. Performances of the proposed predistortion algorithms and the combination scenarios are compared thanks to simulations based on IEEE802.il a/g standards for a memoryless solid state PA

Complementary peak reducing signals for TDCS PAPR reduction

“…The signals lie in a 1.2 GHz carrier frequency with complex bandwidth 4 MHz. The adjacent channel power ratio (ACPR) is set as −30 dB with a 0.2 MHz guard bandwidth and 4 MHz adjacent channel bandwidth [20,21]. According to Table 1, clipping methods are the realisable and widely used approaches of TDCS PAPR reduction.…”

Shaping Code in Conjunction with DCT for PAPR Reduction in Multicarrier System

“…Various techniques have been proposed in the literature to mitigate the effect of this problem. Among them, we can cite methods like clipping, clipping and filtering [4][5] [6], Active Constellation Extension (ACE) [8] [9], Tone Reservation (TR) [6] [7][10] [11] [12] [13], Selected Mapping (SLM) [14] [15], switching [16], coding methods [17] [18], Partial Transmit Sequence (PTS) [9][19] [20], interleaving [21] [22], and Discrete Cosine Transform (DCT) [23][24] [25]. Those techniques can be classified into three classes [26]: coding techniques, adding signal techniques, and probabilistic techniques.…”

Shaping Code in Conjunction with DCT for PAPR Reduction in Multicarrier System

“…Various techniques have been proposed in the literature to mitigate the effect of this problem. Among them, we can cite methods like Clipping, Clipping and filtering [4][5] [6], Active Constellation Extension (ACE) [7] [8], Tone Reservation (TR) [6][9] [10] [11] [12], Selected Mapping (SLM) [13] [14], Switching [15], Coding methods [16], Partial Transmit Sequence (PTS) [8] [17] [18], Interleaving [19] [20] and Discrete Cosine Transform (DCT) [21] [22] [23] [24]. Those techniques can be classified into 3 types [25]: the adding signal techniques, the probabilistic techniques and the coding techniques.…”