SC-FDE

About: SC-FDE is a research topic. Over the lifetime, 438 publications have been published within this topic receiving 7547 citations.

Novel Pilot Design and Signal Detection for SC-FDE Systems With Frequency-Domain Pilot Multiplexing Technique

Abstract: The performance of single-carrier frequency-domain equalization systems with the frequency-domain pilot multiplexing technique is affected by the level of signal distortion, which highly depends on the pilot position selection (PPS) scheme at the transmitter and the signal detection (SD) scheme at the receiver. In this letter, by exploring the relationship between distorted symbols and decision boundaries, we propose a novel PPS scheme to confine the distorted symbols within their designated decision regions, which dispenses with a priori knowledge of the channel. Based on the maximum-likelihood criterion, we also propose a novel SD scheme to avoid error propagation, which operates on a symbol-by-symbol basis. Simulation results on bit error rate show that our proposed PPS scheme achieves almost the same performance as the optimal one and our proposed SD scheme outperforms the existing one in additive white Gaussian noise channels; in addition, both proposed schemes outperform their existing counterparts in frequency-selective Rayleigh fading channels.

SC-FDE Based Full-Duplex Relay Communication Robust to Residual Loop Interference

Abstract: In this letter, we consider a full-duplex (FD) relay communication network on flat fading Rayleigh channels, where the relay is allowed to receive and transmit at the same time and over the same frequency band. Based on single carrier frequency domain equalization, we propose an amplify-and-forward protocol FD relaying scheme, which is robust to the residual loop interference. In this scheme, the relay only needs to amplify and forward the received signal by controlling the amplifying factor and as a result the processing at the relay is simple. The amplifying factor is optimized in terms of system parameters such as the length of cyclic prefix, noise power, and estimated channel state information. Simulation results are presented to evaluate the performance of the proposed scheme and verify the theoretical analysis.

Novel Robust Pilot Detection Method for Channel Estimation in Single-Carrier Frequency-Domain Equalization Systems

Abstract: In this paper, the frequency-domain pilot multiplexing techniques (FDPMTs) for the channel estimation in single-carrier frequency-domain equalization (SC-FDE) systems are studied. A simple but effective pilot-position estimation technique is proposed. The rigorous theoretical analysis and the Monte Carlo simulation results both show that our proposed method is more robust than other existing methods over multipath fading channels, especially when the signal-to-noise ratio (SNR) is low.

Partial FFT Demodulation With IRC in MIMO-SC-FDE Communication Over Doppler Distorted Underwater Acoustic Channels

Abstract: Multi-input multi-output single carrier frequency domain equalization (MIMO-SC-FDE) has been extensively researched in the past years as a technique to realize high data-rate underwater acoustic (UWA) communication. However, it will suffer from severe inter-symbol interference(ISI), frequency offset and co-channel interference (CoI) over Doppler distorted UWA channels. In order to solve the above problems introduced by UWA channels in MIMO communication scenario, partial FFT demodulation with interference rejection combining (IRC) algorithm is proposed in this letter. Compared with previous works, the proposed algorithm has the ability to simultaneously suppress signal distortion brought by ISI, Doppler shift and CoI by frequency domain processing. Numerical simulation results show that the BER performance of MIMO-SC-FDE in Doppler distorted UWA channel environment is improved with acceptable increase of computational complexity.

Wavelet-denoising-based SC-FDE channel estimation method in short wave channel

Abstract: The invention discloses a wavelet-denoising-based SC-FDE channel estimation method in a short wave channel. The wavelet-denoising-based SC-FDE channel estimation method includes the steps of firstly, partitioning sent data, periodically inserting pilot frequency between data blocks, extracting information at the pilot frequency positions at a receiving end, and estimating channel frequency responses at the pilot frequency with an LS algorithm; secondly, carrying out IDFT on obtained estimation values to be in a time domain, factoring the estimation values in a wavelet domain according to a multi-Mallat algorithm, filtering out noise with a threshold denoising method, and reconstructing noise-eliminated signals; finally, carrying out interpolation zero filling on the reconstructed signals, carrying out DFT on the reconstructed signals to be in a frequency domain, accordingly obtaining all the channel frequency responses, and completing channel estimation. According to the wavelet-denoising-based SC-FDE channel estimation method in the short wave channel, the LS estimation left noise is eliminated with a wavelet denoising method, influences of the noise are further suppressed accordingly, the system bit error rate is lowered, and the system performance is improved.