tailieunhanh - Báo cáo hóa học: "Research Article PAPR and the Density of Information Bearing Signals in OFDM"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article PAPR and the Density of Information Bearing Signals in OFDM | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2011 Article ID 561356 9 pages doi 2011 561356 Research Article PAPR and the Density of Information Bearing Signals in OFDM Holger Boche and Brendan Farrell Lehrstuhlfur Theoretische Informationstechnik Technische Universitat Munchen Arcisstrafie 21 80333 Munchen Germany Correspondence should be addressed to Holger Boche boche@ Received 9 November 2010 Accepted 6 February 2011 Academic Editor Simon Litsyn Copyright 2011 H. Boche and B. Farrell. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. We address the peak-to-average power ratio PAPR of transmission signals in OFDM and consider the performance of tone reservation for reduction of the PAPR. Tone reservation is unique among methods for reducing PAPR because it does not affect information bearing coefficients and involves no additional coordination of transmitter and receiver. It is shown that if the OFDM system always satisfies a given peak-to-average power ratio constraint then the efficiency of the system defined as the ratio of the number of tones used for information to the entire number of tones used must converge to zero as the total number of tones increases. More generally we investigate and provide insight into a tradeoff between optimal signal and information properties for OFDM systems and show that it is necessary to use very small subsets of the available signals to achieve PAPR reduction using tone reservation. 1. Introduction OFDM is one of today s most widely used and promising information transmission schemes. One of the main disadvantages of OFDM however is the large peak-to-average power ratio PAPR of the transmit signals. Reducing the PAPR which we will call the PAPR reduction problem has been an area of extensive research over the .

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