Chanel Estimation in SC-FDE Using FZC and Performance Comparison with OFDM in PAPR Reduction for High Order Modulation

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Authors

1 -

2 sadr inistitutions

Abstract

Broadband wireless systems are subject to variable channel conditions due to destructive propagation features such as multi-path fading. The OFDM is a multi-carrier technique which can overcome these effects. This paper focuses on the evaluation of the SC-FDE algorithm, which is considered a suitable replacement for OFDM systems. The SC-FDE algorithm is a new technique in the field of wireless communications. This technique has been able to improve the time and frequency synchronization performance in addition to maintaining the channel estimation and compensation features of the OFDM technique. The SCFDE technique compensates the negative  features of OFDM systems, especially the RF amplifier sensitivity, the carrier frequency offset, and the PAPR challenge. In fact, SC-FDE systems are less susceptible to RF disturbances and power amplifier nonlinearity due to structural reasons, which improves the PAPR parameter in high-order modulation. In this paper, a new approach is used to apply the FZC sequence in synchronization and the channel estimation in the information frame. The performance of the radio link in 256 QAM modulation has also been investigated. Furthermore, training sequence transmission in data frames has been reduced by selecting an adaptive scheme for framing. This scheme can reduce the transmission of the training sequence up to 4 times.

Keywords


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