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http://dx.doi.org/10.5515/KJKIEES.2010.21.9.965

Effective Comb Type Pilot Assignment and PAPR Reduction in NC-OFDM-Based Communication System  

An, Dong-Geon (Department of Electronic Engineering, Chungbuk National University)
Ryu, Heung-Gyoon (Department of Electronic Engineering, Chungbuk National University)
Lee, Seung-Jun (Communication R/D Center, LIG Nex1 Co.)
Ko, Dong-Kuk (Communication R/D Center, LIG Nex1 Co.)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.21, no.9, 2010 , pp. 965-970 More about this Journal
Abstract
Because of a large number of subcarriers, the high PAPR(Peak-to-Average Power Ratio) is the major drawback of NC-OFDM system used for wireless communication system. Comb type pilot assignment is more efficient and lower computational complexity for the channel estimation than the block type pilot. However, even if the CAZAC(Constant Amplitude Zero Autocorrelation) matrix transform is used for the PAPR reduction of the data symbols, PAPR increases when the pilot is inserted in comb type with the data symbols. Therefore, in this paper, we additionally use a new SLM technique in order to lower the PAPR again even in the comb type pilot. Also, a new SLM technique suggested in this paper does not need any additional bandwidth for sending selection information for SLM. This combined method has good PAPR reduction performance and efficient data transmission.
Keywords
NC-OFDM; PAPR; SLM; Comb Type Pilot;
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