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DCT SLM Scheme for Peak-to-Average Power Ratio Reduction in OFCDM System

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IJCA Proceedings on International Conference on Quality Up-gradation in Engineering, Science and Technology
© 2015 by IJCA Journal
ICQUEST 2015 - Number 2
Year of Publication: 2015
Authors:
C. S. Aher
M. N. Thakare
P. R. Lakhe

C s Aher, M n Thakare and P.r.lakhe. Article: DCT SLM Scheme for Peak-to-Average Power Ratio Reduction in OFCDM System. IJCA Proceedings on International Conference on Quality Up-gradation in Engineering, Science and Technology ICQUEST 2015(2):1-4, October 2015. Full text available. BibTeX

@article{key:article,
	author = {C.s. Aher and M.n. Thakare and P.r.lakhe},
	title = {Article: DCT SLM Scheme for Peak-to-Average Power Ratio Reduction in OFCDM System},
	journal = {IJCA Proceedings on International Conference on Quality Up-gradation in Engineering, Science and Technology},
	year = {2015},
	volume = {ICQUEST 2015},
	number = {2},
	pages = {1-4},
	month = {October},
	note = {Full text available}
}

Abstract

We introduce DCT SLM orthogonal frequency coded division multiplexing (OFCDM) scheme for reduction of peak to average power ratio. There is a time for high-speed data transmission in mobile communications. OFCDM is very promising technique for 4G standard like LTE (Long Term Evolution) and WIMAX (Worldwide Inter-operability for Microwave Access) but also has some issues like frequency-offset and PAPR (peak-to-average power ratio). High peak-to-average power ratio (PAPR) of the transmitted signal originates from the superposition of many independent subcarriers. In this paper, a Discrete Cosine Transform based modified selective mapping technique is proposed to reduce the PAPR of the transmitted signal. This method combines Discrete Cosine Transform (DCT) with modified Selective Level Mapping (SLM), the variant of SLM make use of the standard array of linear block codes. The proposed method can be realized in two ways- scheme 1 and 2. In scheme1 DCT is used before the IFFT block in Modified SLM and in scheme 2 DCT is used after the Modified SLM block. Simulation results shows that Scheme 1 is having better reduction performance than the scheme 2. Due to PAPR reduction ICI and ISI both reduces drastically.

References

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