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PAPR ANALYSIS OF CLASS-III SLM SCHEME BASED ON VARIANCE OF CORRELATION OF ALTERNATIVE OFDM SIGNAL SEQUENCES

Category : Communication


Sub Category : OFDM


Project Code : ITCM09


Project Abstract

Selected mapping (SLM) is a well-known peak-to average power ratio (PAPR) reduction technique for orthogonal  frequency division multiplexing (OFDM) systems. Recently, a low-complexity SLM scheme, called Class-III SLM scheme, was proposed, which performs only one inverse fast Fourier transform (IFFT) to generate alternative OFDM signal sequences. By randomly selecting the cyclic shift and rotation values, Class-III SLM scheme can generate up to N3 alternative OFDM signal sequences, where N is the IFFT size. However, all N3 alternative OFDM signal sequences do not achieve good PAPR reduction performances. Therefore, an efficient selection method of good rotation and cyclic shift values is needed, which results in good PAPR reduction performance. In this letter, a selection method of cyclic shift values is proposed, which is optimal in terms of minimizing the variance of correlation values between alternative OFDM signal sequences. It is also shown that rotation values are useless when U ≤ N/8, where U is the number of alternative OFDM signal sequences. Also, a selection method of proper rotation values when U >N/8 is proposed. Simulation results show that the proposed method achieves the optimal PAPR reduction performance. In addition, the proposed scheme requires less memory and side information than random scheme.

EXISTING SYSTEM

PROPOSED SYSTEM

EXISTING CONCEPT

In this paper, three novel low-complexity SLM schemes are proposed, where the IFFT blocks were replaced by conversion vectors. We first claim that conversion vectors should be specified in the form of perfect sequences using  Class-I and Class-II SLM schemes.

 

PROPOSED CONCEPT

we focus on Class-III SLM scheme and propose a selection method of optimal cyclic shift values by analyzing the correlation between alternative OFDM signal sequences. The proposed analytic method can also be applied to Class-I and Class-II SLM schemes.

EXISTING TECHNIQUE:

Class-I and Class-II Selected mapping (SLM) used

PROPOSED TECHNIQUE:

Class-III Selected mapping conversion vector  better PAPR reduction .

DRAWBACKS

      High peak-to-average power ratio (PAPR)

 Bit error is high

 

ADVANTAGES

Makes efficient use of the spectrum by

allowing overlap

High transmission bitrates.

      Better BER performance and lower            complexity

 

 
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