TITLE:
PAPR Reduction Based on Proposed Rotating Phase Shift Technique in MC-CDMA Using FPGA
AUTHORS:
Ali Kareem Nahar, Kamarul H. Bin Gazali
KEYWORDS:
MC-CDMA, PAPR, RPS and FPGA
JOURNAL NAME:
International Journal of Communications, Network and System Sciences,
Vol.8 No.7,
July
17,
2015
ABSTRACT: FPGA implementation used of Rotating phase
shift (RPS) for peak-to-average power ratio (PAPR) reduction in Multi Carrier
Code Division Multiple Access (MC-CDMA) signals. Because, MC-CDMA is still
suffering from PAPR which is a major drawback in most of the multi carrier
communication systems. In addition, the implementation of the system in an FPGA
becomes more flexible and scalable. It eliminates the search for optimum phase
factors from a given set, which manifests improved PAPR at reduced
computational complexity as compared to conventional PTS and SLM. The amplitude
of the signal is reduced by rotating each of the partially transmitted sequence
anticlockwise by a π/2 degree and the peak power is reduced by circularly
shifting the quadrature component of the partially transmitted sequence after
phase rotation. A brief description of PTS, SLM is compared with the RPS, which
best reduces PAPR from PTS and SLM. It is also presented that VHDL code of the
RPS is designed by Xilinx ISE 14.1 implements of FPGA. The peak-to-average
power ratio performance of the proposed method has been investigated.