An Efficient Transceiver Scheme for SC-FDMA Systems Based on Discrete Wavelet Transform and Discrete Cosine Transform

Abstract

In this paper, the discrete cosine transform (DCT) is utilized for single carrier frequency division multiple access (SC-FDMA) transmission. Firstly, an improved DCTbased SC-FDMA (DCT SC-FDMA) system is introduced. Then, the paper presents a new transceiver architecture design for the uplink SC-FDMA system that implements a cosine basis function or a complex exponential Fourier basis function. The proposed architecture uses the discrete wavelet transform and a hybrid companding and clipping method for peak-to-average power ratio (PAPR) reduction. From the simulation results, it is shown that the DCT SC-FDMA system achieves a superior bit error rate (BER) performance than that of the discrete Fourier transform based SC-FDMA (DFT SC-FDMA) system. The results also show that the proposed wavelet based transceiver architectures for the DFT SC-FDMA system and the DCT SC-FDMA system can provide a better BER performance and a lower PAPR than the conventional DFT SC-FDMA system.

Non‐linear companding based hybrid PAPR reduction approach for DCT‐SCFDMA system

“…This work is the further advancement of our recent research work [10]. Implementing the DCT‐SCFDMA system proposed in [1], the efficaciousness of our proposed PAPR dilution process is ascertained in this work. In addition, a comparative analysis with aforementioned system incorporating pulse shaping process only has portrayed the significant advantage of our scheme in terms of BER performance.…”

“…In wireless communication technology, single carrier frequency division multiple access (SCFDMA) technique has drawn much attention for being implemented in the uplink communication due to its lower peak‐to‐average power ratio (PAPR). A novel method using discrete cosine transform (DCT) as basis function in SCFDMA system is proposed by Al‐Kamal et al [1]. Impressive energy compaction characteristic is found in DCT rather than in discrete Fourier transform (DFT) process which makes the system more flexible to scale down the effect of inter‐symbol interference (ISI) significantly [2].…”

A Novel Joint Scheme of PAPR Reduction and BER Performance Enhancement in Interleaved DCT-SCFDMA System

“…At a certain BER=10 -4 , it observed that, the performance gain is better for the proposed DCT-SCFDMA system over the DCT-SCFDMA system modeled in [16] when the QPSK modulation scheme has been adopted for interleaved subcarrier allocation. The desired symbol suffers less interference coming from neighboring symbols in proposed DCT-SCFDMA system.…”

“…The universal pulse that satisfies Eqs. (3) and (4) is the conventional raised-cosine (RC) filter, which has the following spectral magnitude [16]-…”

Shaping Code in Conjunction with DCT for PAPR Reduction in Multicarrier System

“…For different values of IBO, we can note a reduction of about 2 dB by applying the proposed method, compared to the original signal. This is mainly the effect of the DCT method, known for its good frequency compaction and a good spectral efficiency [35]. Combined with shaping technique, it allows significant PAPR reduction while help maintaining the spectrum in the standard specification.…”