Blind SLM for PAPR reduction of Alamouti DSFBC systems

Milad Fallahzadeh | Mahmoud Ferdosizadeh

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URL :   http://research.shahed.ac.ir/WSR/WebPages/Report/PaperView.aspx?PaperID=42826
Date :  2017/02/09
Publish in :    IET Communication
DOI :  https://doi.org/10.1049/iet-com.2016.0340
Link :  http://dx.doi.org/10.1049/iet-com.2016.0340
Keywords :PAPR

Abstract :

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The combination of differential space-time block codes (DSTBC) and orthogonal frequency-division multiplexing (OFDM) as DSFBC-OFDM system is a good candidate to achieve maximum diversity without the need to channel estimation. High peak-to-average-power ratio (PAPR) is a major drawback in these systems. The available PAPR reduction methods are not directly applicable in DSFBC-OFDM system. In this paper, the proper application of selected mapping (SLM) method for reducing PAPR in Alamouti DSFBC-OFDM system is investigated and two different schemes are presented: conventional SLM (C-SLM) and blind differential SLM (BD-SLM). In C-SLM technique, the index of the selected phase sequence must be sent to the receiver side as the side information (SI). In proposed BD-SLM method, specific phase mask vectors are generated with one-to-one correspondence with the different phase rotation sequences. Then at the receiver side, a differential minimum Hamming distance (DMHD) decoder is introduced to detect the index of optimum phase mask vectors without SI. Simulation results show that the proposed BD-SLM scheme (without the need to SI) provides good performances of both the bit error rate (BER) and PAPR reduction compared with C-SLM method.