Impact analysis of input and output block size of DCT-SCFDMA system

Abstract

This paper aims to analyze the bit error rate (BER) and peak to average power ratio (PAPR) for discrete cosine transform (DCT) based single carrier frequency division multiple access (SCFDMA) system. Note that BER and PAPR are the major concerns for any wireless communication and for having lower PAPR till now discrete Fourier transform (DFT) based SCFDMA is implemented for the up-link communication for long term evolution (LTE). This paper focuses to analyze the effect of the input and output block size of DCT based SCFDMA system which is a supplementary of the DFT-SCFDMA system. Using the conventional raised cosine (RC) and square root raised cosine (RRC) pulse shaping filters with different sub-carrier mapping schemes (e.g. interleaved frequency division multiple access (IFDMA), localized frequency division multiple access (LFDMA) and distributed frequency division multiple access (DFDMA)) the paper analyze the PAPR for the DCT based SCFDMA system. The suitable block size of DCT-SCFDMA is very important to improve the BER and PAPR performances of the system because if the block sizes vary then the PAPR also changes. Therefore, this paper also analyzes the impact of the input and output block size of the system. Finally, the numerical evaluation is done using the pulse shaping filter for different sub-carrier mapping schemes based on the different block sizes. From the numerical analysis and evaluation this paper shows the way to chose the input and output block size to have a significantly low PAPR and BER.