期刊名称：International Journal of Innovative Research in Computer and Communication Engineering
印刷版ISSN：2320-9798
电子版ISSN：2320-9801
出版年度：2015
卷号：3
期号：3
DOI：10.15680/ijircce.2015.0303001
出版社：S&S Publications
摘要：The 3GPP long term evolution (3GPP-LTE) has adopted the Discrete Fourier Transform SpreadingOrthogonal Frequency Division Multiple Access (DFTS-OFDMA) technique to be used in the uplink air interface forthe next generation cellular systems. The DFTS-OFDMA is also a candidate of radio interface technologies for theIMT-Advanced standards in ITU-R. This technique has been adopted for uplink transmission due to its attractivefeature of lower PAPR archived by precoding data symbols using a DFT operation at the transmitter.In this paper, we analyse the performance of DFT-Spreading OFDMA technique in PAPR reduction by using theIFDMA and LFDMA subcarriers mapping modes. We also analyse the performance of the DFTS OFDMA techniquefor PAPR reduction as the number of subcarriers allocated to each user varies, specifically with the LFDMAsubcarriers mapping mode. Simulation results show that, the IFDMA improves PAPR performance significantly thanLFDMA with pulse shaping and wihout pulse shaping but at a cost of increased bandwidth.Moreover, the performanceof DFT-Spreading with LFDMA improves when the number of subcarriers allocated to users becomes small. Although,in-terms of PAPR power efficiency, the IFDMA performs better than LFDMA allocation scheme, but LFDMA is verysuperior in terms of throughput when channel dependent scheduling is utilized and has been widely implemented inLTE.
关键词：OFDMA; Peak to Average Power Ratio (PAPR); Subcarriers; FDMA; Orthogonal
