On the PAR Reduction of OFDM Signals Using Multiple Signal Representation

Jayalath, Dhammika; Athaudage, C.R.N.

doi:10.1109/lcomm.2004.832767

Cited by 45 publications

(20 citation statements)

References 9 publications

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“…Let the frequency-domain candidate signal S0 = X be the original data vector and the corresponding time-domain signal be s 0 =F -1 S0 = F -1 X, where F -1 represents the matrix of IFFT. We denote the random generated phase vector as (5) For m = 0, …, M -1, and the frequency-domain candidate signals as…”

Section: Figure 1 Conventional Slmmentioning

confidence: 99%

A Modified Approach Based On SLM for OFDM PAPR Reduction Using Time Domain SubBlock Conversion Matrix

Attar¹,

Bhujade²

2015

IJRITCC

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Abstract-OFDM is a digital transmission method developed to meet the increasing demand for higher data rates in communications which can be used in both wired and wireless environments. This paper describes the issue of the PAPR in OFDM which is a major drawback, and presents new and variations to existing algorithms to reduce it. The effect on system performance in terms of the BER and Pow er Spectral Density is simulated for an OFDM transceiver with a saturated High Power Amplifier. A modified SLM approach based on time -domain subblock conversion matrices to reduce the computational complexity due to multiple IFFTs. This scheme is modified from the conversion matrix scheme. By dividing the frequency-domain signals into multiple sub-blocks, the number of the valid conversion matrices can be increased, and thus more candidate signals are available for PAPR reduction. By applying proposed scheme, the number of candidate signals can be increased from 12 in the original conversion matrix scheme to 28 and 128 for the two sub block and four-sub block cases, respectively. The scheme will provide improved PAPR reduction performance. In the same paper problem occurs due to the side information is also try to reduced. false side information detection degrades the bit error rate (BER) performance significantly. In this paper, we propose a novel SLM schem e without any side information by devising phase rotation and simple scrambler detection in the receiver.

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Section: Figure 1 Conventional Slmmentioning

confidence: 99%

A Modified Approach Based On SLM for OFDM PAPR Reduction Using Time Domain SubBlock Conversion Matrix

Attar¹,

Bhujade²

2015

IJRITCC

View full text Add to dashboard Cite

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“…An OFDM signal of N-subcarriers modulated by N-data samples drawn randomly from a multi-level baseband modulation such as M-quadrature amplitude modulation (M-QAM) or M-phase shift keying modulation (M-PSK) can be formed as [20] …”

Section: Principles Of Ofdm and Slmmentioning

confidence: 99%

“…It is important to mention here that the PAPR value will be reduced by increasing the number of PRVs, β, and, consequently, the computational complexity will be increased accordingly. Thus, a lower bound of PAPR reduction can be obtained for a given level of complexity [20]. This bound depends on β.…”

Section: Introductionmentioning

confidence: 99%

Post-IFFT-Modified Selected Mapping to Reduce the PAPR of an OFDM System

Taher

Singh

Ismail

et al. 2014

Circuits Syst Signal Process

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Orthogonal frequency-division multiplexing is now one of the most important modulation techniques due to its advantages. Despite its ability to overcome the equalization problem, multipath fading channels, and other issues, this system has a serious problem concerning the high output peaks with respect to the average power, which is called the peak-to-average power ratio (PAPR). Selected mapping (SLM), partial transmitted sequence, and amplitude clipping and filtering are some efficient methods to reduce the PAPR. In a previous work, we slid a single-phase rotation vector Circuits Syst Signal Process on the data sequence in the frequency domain to reduce the PAPR and the complexity compared to the conventional SLM. In this paper, we present a novel method that utilizes the same approach of our previous work, but it processes the data after the inverse fast Fourier transform block (time-domain operations) using a modified version of the SLM scheme, which has less computational complexity than the conventional one. The mathematical derivations and the simulation results show that the PAPR, the computational complexity, and the side information were reduced significantly by the proposed method.

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“…(5). In general, the proposed VIA scheme can be classified into a special multiple signal representation scheme [6], which generates multiple candidate signals and selects the lowest-PAPR signal for transmission. An advantage of VIA is that the special freedom of OFDM-IDMA is explored and further utilized to generate multiple candidate signals, instead of the original signal mapping schemes such as phase-rotation based partial transmit sequence (PTS) [7], etc.…”

Section: Variable Interleaver Designmentioning

confidence: 99%

“…The basic idea is to allocate multiple interleaving patterns for each user, so as to decide the best pattern with the lowest peak value. In general, the proposed VIA scheme can be classified as a special multiple signal representation (MSR) scheme [6], and hence to achieve the theoretical bound of MSR by exploring the special freedom of OFDM-IDMA and saving the additional complexity for signal de-mapping.…”

Section: Introductionmentioning

confidence: 99%

Variable Interleaver Allocation for Downlink OFDM-IDMA

Xiao

et al. 2011

Wireless Pers Commun

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In this letter, a variable interleaver allocation scheme is proposed to alleviate the high peak-to-average power ratio (PAPR) of downlink OFDM-IDMA (orthogonal frequency division multiplexing-interleave division multiple access). The basic idea is to allocate multiple interleaving patterns for each user, so as to decide the best pattern with the lowest peak value. Furthermore, a variable interleaver design scheme is combined to generate multiple patterns from an original one. It is shown that the proposed scheme can achieve the theoretical bound of PAPR reduction performance, while making a good tradeoff among PAPR reduction, system performance and computational complexity.

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On the PAR Reduction of OFDM Signals Using Multiple Signal Representation

Cited by 45 publications

References 9 publications

A Modified Approach Based On SLM for OFDM PAPR Reduction Using Time Domain SubBlock Conversion Matrix

A Modified Approach Based On SLM for OFDM PAPR Reduction Using Time Domain SubBlock Conversion Matrix

Post-IFFT-Modified Selected Mapping to Reduce the PAPR of an OFDM System

Variable Interleaver Allocation for Downlink OFDM-IDMA

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