BibTeX
@MISC{_compandingtransform,
author = {},
title = {Companding Transform in OFDM System},
year = {}
}
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Abstract
Abstract– – Communication methods are increasing day by day. Orthogonal frequency division multiplexing (OFDM) systems is one of the most recent emerging trends in wireless communication. However, the major drawback of OFDM is the high Peak-to-Average Power (PAPR) which results in the Bit Error Rate (BER) performance degradation. A number of approaches have been proposed to deal with the PAPR problem. In this paper, PAPR reduction in OFDM systems is based on combining Low-Density Parity Check (LDPC) codes and Discrete Cosine Transform (DCT) with companding technique. Thus the proposed scheme involves three steps: First, applying LDPC codes on the original signal for decreasing both the PAPR and BER. Second, the DCT is applied on the LDPC output. Finally, the proposed scheme utilizes the companding technique to further reduce the PAPR of the OFDM system. Keywords––OFDM, PAPR, Discrete Cosine Transform, LDPC codes.
Keyphrases
ofdm system ldpc code discrete cosine transform major drawback original signal high peak-to-average power proposed scheme bit error rate wireless communication abstract communication method ldpc output companding technique low-density parity check performance degradation orthogonal frequency division multiplexing keywords ofdm papr problem papr reduction
