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http://dx.doi.org/10.5515/KJKIEES.2009.20.4.381

Performance Evaluation of FD-CI-OFDM System with PAPR Reduction and Frequency Diversity Effects  

Kim, Seon-Ae (Department of Electronic Engineering, Research Institute of Computer, Information & Communication, Chungbuk National University)
Lee, Il-Jin (Department of Electronic Engineering, Research Institute of Computer, Information & Communication, Chungbuk National University)
Ryu, Heung-Gyoon (Department of Electronic Engineering, Research Institute of Computer, Information & Communication, Chungbuk National University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.20, no.4, 2009 , pp. 381-389 More about this Journal
Abstract
Orthogonal frequency division multiplexing(OFDM) that is very useful for the high-speed communication system has serious problem of high peak-to-average power ratio(PAPR) in time domain. Because of this, the non-linear distortion can be produced and system performance gets worse. CI-OFDM system can get the peak power lowered. In this CI-OFDM system, each parallel data is distributed into N all sub-carriers and conveyed by the orthogonal phase factor. Also, CI-OFDM shows frequency diversity effect. Therefore, CI-OFDM system is better than ordinary OFDM system in terms of BER performance and the PAPR reduction. When it is implemented, however, there is a serious problem whether it can separate and compensate the phase factor in order in the receiver. Because all bits are transmitted simultaneously over all subcarriers and each other phase factors in transmitter. In this paper, we propose and evaluate a FD-CI-OFDM system that is a version of improved CI-OFDM. This is designed by use of the Walsh Hadamard sequence. The FD-CI-OFDM shows better performance than ordinary OFDM and CI-OFDM system.
Keywords
OFDM; Carrier Interferometry; PAPR; Walsh Code; Frequency Diversity;
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