tailieunhanh - Báo cáo hóa học: " Research Article Partial Transmit Sequences for Peak-to-Average Power Ratio Reduction in Multiantenna 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 Partial Transmit Sequences for Peak-to-Average Power Ratio Reduction in Multiantenna OFDM | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2008 Article ID 325829 11 pages doi 2008 325829 Research Article Partial Transmit Sequences for Peak-to-Average Power Ratio Reduction in Multiantenna OFDM Christian Siegl and Robert F. H. Fischer Lehrstuhlfur Informationsubertragung Friedrich-Alexander-UniversitatErlangen-Nurnberg Cauerstrasse 7 LIT 91058 Erlangen Germany Correspondence should be addressed to Christian Siegl siegl@ Received 30 April 2007 Accepted 17 September 2007 Recommended by Luc Vandendorpe The major drawback of orthogonal frequency-division multiplexing OFDM is its high peak-to-average power ratio PAR which gets even more substantial if a transmitter with multiple antennas is considered. To overcome this problem in this paper the partial transmit sequences PTS method well known for PAR reduction in single antenna systems is studied for multiantenna OFDM. A directed approach recently introduced for the competing selected mapping SLM method proves to be very powerful and able to utilize the potential of multiantenna systems. To apply directed PTS various variants for providing a sufficiently large number of alternative signal superpositions the candidate transmit signals are discussed. Moreover affording the same complexity it is shown that directed PTS offers better performance than SLM. Via numerical simulations it is pointed out that due to its moderate complexity but very good performance directed or iterated PTS using combined weighting and temporal shifting is a very attractive candidate for PAR reduction in future multiantenna OFDM schemes. Copyright 2008 C. Siegl and R. F. H. Fischer. 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. 1. INTRODUCTION Future wireless communication systems demand for higher and higher data .