A low-complexity SLM based PAPR reduction scheme for SFBC MIMO-OFDM systems

Wang, Chin-Liang; Wang, Shun-Sheng; Chang, Hsiao-Ling

doi:10.1109/wcnc.2011.5779373

Cited by 19 publications

(11 citation statements)

References 13 publications

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“…Literature also addresses [8] time domain channel tracking methods like MMSE, LMS, RLS adaptive estimators for OFDM systems. These methods use training symbols for estimator coefficient updating.…”

Section: Channel Estimationmentioning

confidence: 99%

BER and MSE Performance of MIMO-OFDM System using Channel Estimation Technique

Sharma¹,

Khare²

2018

IJCA

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Next generation mobile systems will use multiple antennas at the transmitter and receiver to achieve higher capacity and diversity gain at high speeds. By transmitting through multiple transmitting and receiving antennas, multiple wireless data pipes are created. A transmitted signal while propagating through the wireless channel undergoes multipath fading effect accompanied by noise and interference. Mitigation of these effects and increase in throughput is only possible if the channel is accurately estimated at the receiver in order to perform channel estimation.Depending on slow/fast channel fading conditions, several authors suggested adaptive LMS, RLS, and NLMS based channel estimators, which either require statistical information of the channel or are not efficient enough in terms of performance or computations.In order to overcome the above effects, the work focuses on the QR-RLS based channel estimation method for MIMO-OFDM systems. The proposed algorithm based on QR-RLS channel estimation technique provide reduce mean square error (MSE) and bit error rate (BER) compared to previous channel estimation technique.

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Section: Channel Estimationmentioning

confidence: 99%

BER and MSE Performance of MIMO-OFDM System using Channel Estimation Technique

Sharma¹,

Khare²

2018

IJCA

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“…If the new PAP is lower than in the previous step, retain b 1 as part of the final phase sequence, otherwise, b 1 reverts to its previous value. The algorithm continues in this fashion until all V possibilities have been explored [4]. In this way , the better phase factor can be found after only V times searching, but it is not the best one .…”

Section: B Optimal Ptsmentioning

confidence: 99%

“…However, one major drawback of OFDM is its high peak-to-average power ratio (PAPR), which limits the performance of wireless communication systems: high power peaks in transmitted signals lead to a necessity for increasing the dynamic range of corresponding parts of the communication system in order to avoid clipping of signals. Numerous methods have appeared in the literature to improve the PAPR performance of OFDM signals [2][3][4]. Among them, partial transmit sequence (PTS) is known as a distortionless scheme which requires a small amount of redundancy.…”

Section: Introductionmentioning

confidence: 99%

An Optimization Algorithm for PAPR Reduction in OFDM System Based on Tabu Search

Ding

Ruo

et al. 2013

2013 IEEE Eighth International Conference on Networking, Architecture and Storage

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Partial transmit sequence (PTS) is a distortionless technique used to reduce the peak-to-average power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM) systems. However, it has a relatively high computational complexity. A simplified scheme is proposed in this paper. In the proposed scheme, the computation for finding the best scrambling sequences is simplified by making use of the tabu search algorithm, thus achieving the reduction of computational complexity. Algorithm analysis and simulation results show that, as compared with conventional method, the proposed scheme could be implemented with lower complexity while at no loss of PAPR performance. Keywords-orthogonal frequency division multiplexing; peak-to-average power ratio; Tabu search ; partial transmit sequence2013 IEEE Eighth International Conference on Networking, Architecture and Storage 978-0-7695-5034-3/13 $26.00

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“…Moreover, a wrong estimation of the SI at the received side could damage the total signal recovery which leads to significant performance deterioration in terms of bit error rate (BER). Thus, several recent research works, known as blind techniques [15][16][17], have been proposed to avoid the sending of the explicit SI. Some of these studies required the use of a special phase rotations of candidate signals (0 or π) [15], which degrade the PAPR performance.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, several recent research works, known as blind techniques [15][16][17], have been proposed to avoid the sending of the explicit SI. Some of these studies required the use of a special phase rotations of candidate signals (0 or π) [15], which degrade the PAPR performance. The other proposed approaches are only relevant for two antennas [16] or are too complex to be implemented [17].…”

Section: Introductionmentioning

confidence: 99%

PAPR reduction scheme with efficient embedded signaling in MIMO-OFDM systems

Sghaier¹,

Abdelkefi²,

Siala³

2015

J Wireless Com Network

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Multiple input multiple output (MIMO) orthogonal frequency division multiplexing (OFDM) is a promising transmission scheme for high performance broadband wireless communications. However, this technique suffers from a major drawback which is the high peak to average power ratio (PAPR) of the output signals. In order to overcome this issue, several methods requiring the transmission of explicit side information (SI) bits have been proposed in the literature. In fact, the transmitted bits must be channel-encoded as they are particularly critical to the performance of the considered OFDM system. Consequently, this channel-encoding highly increases the system complexity and decreases the transmission data rate. To overcome these problems, we propose in this paper two robust blind techniques that embed the SI implicitly into the OFDM frame. The first technique, referred to as Blind Space Time Bloc Codes (BSTBC), is inspired from the conventional selected mapping (SLM) approach. This technique banks on an adequate embedded signaling that mainly consists in a specific Space Time Bloc Codes (STBC) patterns and a precoding sequence codebook. In addition, in order to improve the signal detection process and the PAPR gain, we propose a new efficient combined Blind SLM-STBC (BSLM-STBC) method. Both methods propose an optimized scheme during the signal estimation process that is based on the maximum a posteriori (MAP) algorithm. A simulation study shows that our investigated approaches result in a spectacular PAPR reduction and furthermore lead to a perfect signal recovery at the receiver side.

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A low-complexity SLM based PAPR reduction scheme for SFBC MIMO-OFDM systems

Cited by 19 publications

References 13 publications

BER and MSE Performance of MIMO-OFDM System using Channel Estimation Technique

BER and MSE Performance of MIMO-OFDM System using Channel Estimation Technique

An Optimization Algorithm for PAPR Reduction in OFDM System Based on Tabu Search

PAPR reduction scheme with efficient embedded signaling in MIMO-OFDM systems

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