A novel selected mapping technique for PAPR reduction in OFDM systems (original) (raw)

Selected mapping without side information for PAPR reduction in OFDM

IEEE Transactions on Wireless Communications, 2009

Selected mapping (SLM) is a technique used to reduce the peak-to-average power ratio (PAPR) in orthogonal frequency-division multiplexing (OFDM) systems. SLM requires the transmission of several side information bits for each data block, which results in some data rate loss. These bits must generally be channel-encoded because they are particularly critical to the error performance of the system. This increases the system complexity and transmission delay, and decreases the data rate even further. In this paper, we propose a novel SLM method for which no side information needs to be sent. By considering the example of several OFDM systems using either QPSK or 16-QAM modulation, we show that the proposed method performs very well both in terms of PAPR reduction and bit error rate at the receiver output provided that the number of subcarriers is large enough.

OFDM PAPR Reduction Using Selected Mapping Without Side Information

2007

Selected mapping (SLM) is a well-known method for reducing the peak-to-average power ratio (PAPR) in orthogonal frequency-division multiplexing (OFDM) systems. The main drawback of this technique is that, for each data block, it requires the transmission of several side information bits, which results in some data rate loss. These redundant bits are so critical to the error performance of the system that they need in practice to be protected by a powerful channel code. This increases the system complexity and transmission delay, and decreases the data rate even further. In this paper, we propose a novel SLM method for which no side information needs to be sent. By considering the example of an OFDM system using 16-QAM modulation, it is shown that the proposed method performs very well both in terms of PAPR reduction and bit error rate at the receiver output.

A novel OFDM PAPR reduction scheme using selected mapping without explicit side information

2008

Selected mapping (SLM) is a technique used to reduce the peak-to-average power ratio (PAPR) in orthogonal frequency-division multiplexing (OFDM) systems. SLM requires the transmission of several side information bits for each data block, which results in some data rate loss. These bits must be channel-encoded because they are particularly critical to the error performance of the system. This increases the system complexity and transmission delay, and decreases the data rate even further. In this paper, we propose a novel SLM method for which no side information needs to be sent. By considering the example of several OFDM systems using either QPSK or 16-QAM modulation, we show that the proposed method performs very well in terms of bit error rate at the receiver output provided that the number of subcarriers is large enough.

A Novel Semi-Blind Selected Mapping Technique for PAPR Reduction in OFDM

IEEE Signal Processing Letters, 2011

In this letter, a novel semi-blind selected mapping (SLM) technique is proposed for peak-to-average power ratio (PAPR) reduction in orthogonal frequency-division multiplexing (OFDM) system. No explicit side information is sent; instead the selected signal index is embedded in transmitted data. The proposed SLM technique maintains the same PAPR as classical SLM technique, while increases the overall throughput. Simulations results of several OFDM systems employing the proposed semi-blind SLM technique using either QPSK or 16-QAM modulation show that it performs very well in in both the SI index detection error rate and bit error rate (BER). Index Terms-Orthogonal frequency-division multiplexing (OFDM), peak-to-average power ratio (PAPR), selected mapping (SLM).

PAPR reduction of Coded OFDM signal using Selective Mapping Technique

Orthogonal Frequency Division Multiplexing (OFDM) is a multicarrier modulation (MCM) technique which seems to be an attractive candidate for fourth generation (4G) wireless communication systems. Peak-to-average Power ratio(PAPR) problem is the major drawback of multicarrier transmission system which leads to power inefficiency.There are various techniques which can be used to reduce PAPR.In this paper Selective mapping technique(SLM) is used to reduce PAPR of coded OFDM signal. Peak-to-Average Power Ratio(PAPR), Complementary Cumulative Distribution Function (CCDF), Selective Mapping(SLM),Partial Transmit Sequence (PTS).Reed Solomon(RS)

Improved Selected Mapping Technique for Reduction of PAPR in OFDM Systems

International Journal of Advanced Computer Science and Applications, 2020

High peak to average power ratio (PAPR) is a limiting factor towards the performance of an OFDM system. Selected Mapping (SLM) is a popular peak to average power ratio (PAPR) reduction scheme used with the OFDM systems. In this technique, U set of candidate sequences are generated that leads to improvement in the PAPR reduction ability of the OFDM systems. The major concern of the conventional SLM is that as the number of candidates is increased, there is a proportional rise in the inverse fast Fourier transforms (IFFT) computations of the systems. In our article we have proposed a scheme in which we increase the number of candidate sequence as (U+U 2 /4) that leads to improved PAPR performance of the OFDM systems without any equivalent rise in the IFFT computations. It has been demonstrated that both the simulation and analytical results are well-approximated in our proposed schemes. We also estimate the threshold value of PAPR at a fixed value of complementary cumulative distribution function (CCDF) for different number of subcarriers and candidate sequences. Results demonstrate that our proposed scheme outperforms in terms of PAPR reduction ability of the OFDM signal and obtains effective PAPR threshold values with negligible loss in BER performance of the system.

PAPR Reduction using Combined Coding , Weighting , and Mapping in OFDM Systems 1

2002

In this paper we present methods for reduction of Peak-to-Average Power Ratio (PAPR) in multi-carrier Orthogonal Frequency Division Multiplexing (OFDM) through the joint use of coding, weighting, and signal mapping. Simple and easyto-implement coding schemes have been identified that when employed with suitable weighting functions can reduce PAPR considerably. Indeed it is shown that PAPR can be controlled by appropriate choice of coding scheme and weighting function for a given signal mapping. A thorough numerical investigation using computer simulations is presented and schemes that offer considerable reduction in PAPR are identified as a function of number of sub-carriers in OFDM systems.

Partial scrambling selected mapping for PAPR reduction of OFDM signals

IEICE Communications Express, 2017

To reduce peak-to-average-power ratio (PAPR) of OFDM signals, a self-synchronized-scrambler-based selected-mapping (SS-SLM) has been investigated, where the transmit sequence is scrambled to reduce PAPR. In this method, the receiver needs to use descrambler to recover the original data. However, the descrambling causes error propagation which degrades bit error rate (BER). In this paper, we propose a partially self-synchronizedscrambler-based selected-mapping (PSS-SLM) which scrambles only most significant bits allocated to I-phase and Q-phase of QAM symbols. Numerical results show that the proposed PSS-SLM achieves better BER than that of SS-SLM in QAM-OFDM systems while keeping the same PAPR reduction capability as SS-SLM.

IJERT-PAPR Reduction in OFDM using Reduced Complexity Selective Mapping Technique

International Journal of Engineering Research and Technology (IJERT), 2014

https://www.ijert.org/papr-reduction-in-ofdm-using-reduced-complexity-selective-mapping-technique https://www.ijert.org/research/papr-reduction-in-ofdm-using-reduced-complexity-selective-mapping-technique-IJERTV3IS090223.pdf Orthogonal Frequency Division Multiplexing (OFDM) is the most promising technique available and is most commonly used due to its advantages like very high data rate, noise immunity and efficient bandwidth utilization. One of the major drawback of OFDM is its high Peak to Average Power Ratio (PAPR). In this paper Selective mapping is used to perform PAPR reduction and same time reducing its complexity so that its implementation uses less floor area and on chip requirements. Results shows that PAPR reduction is similar to Conventional SLM but new technique is less complex than original one in terms of IFFT blocks used and Multipliers used in the process. Keywords-Orthogonal frequency division multiplexing (OFDM), Peak to average power ratio (PAPR), Selective Mapping (SLM), Bit Error Rate (BER), Digital Subscriber Line (DSL), Partial Transmit Sequence (PTS).

Coding Schemes Applied to Peak-to-Average Power Ratio (PAPR) Reduction in OFDM Systems

International Conference on Wireless Communications and Mobile Computing, 2008

High PAPR of the transmitted signal is a major drawback in the OFDM systems. In this paper, coding schemes are proposed to reduce high PAPR One is using parity check coding scheme, and the other is using selected mapping (SLM) applied scheme. With parity check coding scheme, the parity information is used to expand the signal space. Mapping from original