SC-FDE

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

A Method of Phase Noise Estimation and Compensation Based on Golay Sequence in Time Domain for SC-FDE Millimeter-Wave Communication Systems

Abstract: A method of phase noise (PHN) estimation and compensation based on the Golay sequence is proposed in the article for single-carrier frequency-domain equalization (SC-FDE) Millimeter-Wave Systems. First, the channel is estimated based on the correlation with the Golay sequence. Then, the 64-length cyclic prefix (CP) between data blocks is adopted to estimate the common phase error (CPE) of the data blocks after equalization in the frequency domain. Finally, the PHN estimation and compensation after equalization is computed so that the phase deviation can be avoided. Different from previous researches, the algorithm is developed in SC-FDE Systems, using a system symbol transmission rate of 2.4576G sym/s, 64QAM modulation, and each transmission frame structure of 9600 data blocks. In this case, the effect of PHN will be magnified. 1/2 LDPC encoding and decoding are also introduced into this system to further improve the performance. Compared with present algorithms, the algorithm shows better comprehensive performance in MSE of PHN before and after equalization, with the complexity of integrated computation taken into consideration.

Are SC-FDE Systems Robust to CFO?

Abstract: This paper investigates the impact of carrier frequency offset (CFO) on Single Carrier wireless communication systems with Frequency Domain Equalization (SC-FDE). We show that CFO in SC-FDE systems causes irrecoverable channel estimation error, which leads to inter-symbol-interference (ISI). The impact of CFO on SC-FDE and OFDM is compared in the presence of CFO and channel estimation errors. Closed form expressions of signal to interference and noise ratio (SINR) are derived for both systems, and verified by simulation results. We find that when channel estimation errors are considered, SC-FDE is similarly or even more sensitive to CFO, compared to OFDM. In particular, in SC-FDE systems, CFO mainly deteriorates the system performance via degrading the channel estimation. Both analytical and simulation results highlight the importance of accurate CFO estimation in SC-FDE systems.

Efficient channel parameters estimation design for SC-FDE in HF wireless communications

Abstract: This paper proposes an efficient channel parameters estimation design for Single Carrier Frequency Domain Equalization (SC-FDE) in High Frequency (HF) wireless communications. This design is implemented to improve the performance of existing channel estimation by integrating and optimizing traditional channel statistical characteristics estimation. Based on the Synchronization Training Sequences (STS) structure of estimation, our design is able to overcome Inter-Symbol Interference (ISI) and reduce the signal-to-noise ratio (SNR). The proposed algorithm has much better precision and provides the safeguard for subsequent equalization algorithm. Meanwhile, the performance of the proposed algorithm has been compared with existing algorithms. The comparing results show that we can have excellent performance.

Decision feedback equalization in the context of enhanced high rate mobile communications systems - based on the concept of SC/FDE

Abstract: Although nonlinear equalizer structures seem to be a well developed theory, these equalizer structures are rarely investigated in an overall system approach. It is the topic of this paper to point out that it is inevitable to characterize decision feedback equalizer structures (DFE) in the context of channel characteristics, error propagation and implementation effort before talking of performance gain compared to linear equalizer structures. In particular DFE is characterized in the context of antenna diversity and channel coding as these techniques are indispensable for future high rate wireless communications systems. Only this overall system approach allows a reliable statement concerning the expected performance gain due to different equalizer strategies. The simulation results in this work are based on a single carrier system with frequency domain equalization (SC/FDE), as this concept allows an advantageous combination of feedforward frequency domain equalization and feedback equalization in the time domain, combining low signal processing complexity and powerful equalization. The simulation parameters are adapted to the parameters of the IEEE 802.11a standard.

Rate Analysis of SC-FDE and OFDM Systems with Low Resolution ADCs

Abstract: In this paper, we derive the achievable rate of single-carrier frequency domain equalizer (SC-FDE) and orthogonal frequency division multiplexing (OFDM) systems, constrained on low resolution analog to digital converters (ADCs). We assume that there is a full knowledge of channels at both transmitter and receiver sides. We model low resolution ADCs with an additive uniform quantization noise. We consider an ultra-wide band millimeter wave (mm-Wave) system with a frequency selective channel. The channel is based on practical results at mm-Wave frequencies. Our numerical results show that SC-FDE systems with minimum mean square error (MMSE) equalizers outperform OFDM and SC-FDE systems with zero forcing (ZF) equalizers at high signal to noise ratio (SNR) regimes. Moreover, benefits of increasing the ADCs resolution are not significant due to exponentially increment in the power consumption of ADCs.