Abstract
The transmitted Orthogonal Frequency Division Multiplexing signal in systems such as Wireless LAN,Mobile WiMAX, Digital Video Broadcasting (DVB) operating in the Super High Frequency (SHF) band suffers from high Peak to A verage P ower R atio .This is reduced in S elective L evel M apping  (SLM)  approach  b ut  at  the  expense  of  increased complexity.  In this paper,w e propose a iterative selective level mapping algorithm for PAPR reduction with reduced computation complexity . The performance of Iterative SLM is investigated for a new phase sequence set based on mutually orthogonal Golay complementary pairs and results are compared with Walsh-Hadamard sequence set. The iterative threshold is varied between 4-8 dB and candidate signal values of 4,8,16 and 32 are considered for a 64 subcarrier system. Computer simulation results show lesser  computational complexity  in terms  of candidate signal requirement in comparison to conventional SLM, while maintaining an almost identical PAPR.  The new phase sequence set achieves a 1.2 dB and 2.4 dB PAPR improvement over conventional SLM and OFDM respectively for maximum of 16 candidate signals at iterative threshold of 6 dB. The computational complexity reduction achieved is 59%.  Â
Highlights
Orthogonal Frequency division multiplexing(OFDM) is reliable technique for wireless high-rate data transmission over frequency selective fading channels in Super High Frequency (SHF) band.It finds application in physical layer implementationof wireless standards such as Digital Audio Broadcasting (DAB), DigitalVideo Broadcasting (DVB), WLAN standards (802.11), WiMAX (802.16) and Ultra Wide Band (UWB) Communication
One of the major problems of the OFDM system is that it has higher peak to-average-power ratio (PAPR)
The PAPR and complexity performances of conventional Selective Level Mapping (SLM) and proposed method is investigated by computer simulations
Summary
Orthogonal Frequency division multiplexing(OFDM) is reliable technique for wireless high-rate data transmission over frequency selective fading channels in SHF band.It finds application in physical layer implementationof wireless standards such as Digital Audio Broadcasting (DAB), DigitalVideo Broadcasting (DVB), WLAN standards (802.11), WiMAX (802.16) and Ultra Wide Band (UWB) Communication. One of the major problems of the OFDM system is that it has higher peak to-average-power ratio (PAPR). The high peak to average power ratio (PAPR) has a severe impact on power amplifiers forcing it to operate in nonlinear region,which causes inter modulation and out of band radiation. Selective level mapping [1], a distortion less multiple signal representation method to reduce the PAPR of an OFDM symbol was proposed. In this method,primarily U statistically independent sequences referred to as candidate signals which are phase rotated versions of the original OFDM symbol are generated and sequence with least PAPR is selected for transmission over the channel
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