Trigonometric based time domain constellation shaping technique for peak-to-average power ratio reduction in OFDM systems
نویسندگان
چکیده
In this paper, a modified technique based on constellation shaping is proposed to reduce the peak-toaverage power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM) systems. To accomplish significant reduction in PAPR, the energy compaction property of trigonometric transforms such as discrete cosine transform (DCT) is utilized in combination with the time domain constellation shaping technique. The application of trigonometric transforms results in OFDM signal with few energy components, which is then transformed by constellation shaping in time domain. This combined technique with extremely low computational complexity does not involve transmission of side information and is independent of OFDM input. Closed form expression for the complementary cumulative distribution function (CCDF) of PAPR of the proposed technique is derived and confirmed by simulation results. Performance of the proposed algorithm is evaluated and compared for even information bits in case of square QAM, and for odd information bits in case of cross QAM and rectangular QAM. Comparative analysis with the time domain constellation shaping and trigonometric based transform OFDM techniques shows better performance of the proposed scheme with no increase in terms of average power. [Hina Shabbir, Shahzad Amin Sheikh, Faiz Faizullah. Trigonometric based time domain constellation shaping technique for peak-to-average power ratio reduction in OFDM systems. Life Sci J 2012;9(4):4465-4471]. (ISSN: 1097-8135). http://www.lifesciencesite.com. 672
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