Overview Of MC CDMA Papr Reduction Techniques

Sarala, B.

doi:10.5121/ijdps.2012.3217

Cited by 10 publications

(4 citation statements)

References 32 publications

(45 reference statements)

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“…To reduce the PAPR, various techniques have been proposed in literature including the clipping and filtering technique [2], [3], the Partial Transmit Sequences (PTS) [4], [5], the Selective Mapping (SLM) method [6], and Tone Reservation (TR) [7], etc...…”

Section: Introductionmentioning

confidence: 99%

Lowest PAPR Selection Technique from SLM and PTS with One IFFT Block in Wireless MC-CDMA Communication Systems

Mesri¹,

Merah²,

Tahkoubit³

2018

IJET

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Section: Introductionmentioning

confidence: 99%

Lowest PAPR Selection Technique from SLM and PTS with One IFFT Block in Wireless MC-CDMA Communication Systems

Mesri¹,

Merah²,

Tahkoubit³

2018

IJET

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“…In the MC-CDMA, orthogonal codes are used to spread symbols of users and combine them in the frequency domain; this results in a comparatively low symbol rate and non-selective fading in each subcarrier [2]. But, the MC-CDMA systems are facing problems cast by PAPR due to the nature of the multicarrier OFDM and CDMA [3]. The high PAPR drives the power amplifier to operate in the nonlinear area that causes distortions between inter-modulation and out-of-range radiation.…”

Section: Introductionmentioning

confidence: 99%

PAPR Reduction Based on Proposed Rotating Phase Shift Technique in MC-CDMA Using FPGA

Nahar¹,

Gazali²

2015

IJCNS

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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.

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“…The signal distortion techniques cause in-band and out-band distortion since it reduces P APR by distorting the P APR at or around the peaks. The techniques such as peak windowing, envelope scaling, peak reduction carrier etc., come under this category [8]. However care should be taken such that the selected technique should create fewer effects on the performance of the system.…”

mentioning

confidence: 99%

Effectiveness and performance analysis of MC-CDMA system

Rohini¹,

C.D²

2015

2015 International Conference on Control, Instrumentation, Communication and Computational Technologies (ICCICCT)

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To achieve high data rate, large system capacity and multimedia services the next generation wireless communication system uses a multiple access technique such as Multi Carrier Code Division Multiple Access (MC-CDMA). It is actually the mixture of two efficient techniques such as CDMA and OFDM. The CDMA part enhances the spectrum utilization whereas the OFDM part reduces multipath fading and ISI. The OFDM technique uses narrowband signal to reduce the frequency selective multipath fading because narrowband signal are less sensitive to ISI and frequency selective multipath fading. The spreading sequences used in a CDMA system have an efficient role in interference reduction and spectrum utilization. With the use of efficient spreading sequence the system enjoys low interference. The performance of the system will depend upon the correlation properties and length of the spreading sequences used. In this paper we are suggesting a novel coding technique which may further improve the system performance in terms of bit error rate (BER) with the use of Low Density Parity Check (LDPC) codes as the error correcting code. An intensive comparative study were carried out to compare the performance of MC-CDMA system in terms of BER Vs SNR and P APR Vs CCDF curves based on the coding techniques such as Walsh-Hadamard (WH) code and Zero Correlation Zone (ZCZ) code.

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Overview Of MC CDMA Papr Reduction Techniques

Cited by 10 publications

References 32 publications

Lowest PAPR Selection Technique from SLM and PTS with One IFFT Block in Wireless MC-CDMA Communication Systems

Lowest PAPR Selection Technique from SLM and PTS with One IFFT Block in Wireless MC-CDMA Communication Systems

PAPR Reduction Based on Proposed Rotating Phase Shift Technique in MC-CDMA Using FPGA

Effectiveness and performance analysis of MC-CDMA system

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