SC-FDE

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

Frequency Diversity Comparison of Coded SC-FDE & OFDM on Different Channels

Abstract: This paper compares the relative performance of coded single carrier frequency domain equalisation (SC-FDE) and orthogonal frequency-division multiplexing (OFDM) on frequency-selective fading channels We focus on the extent to which the two schemes can exploit the frequency diversity inherent in such channels Channels with different impulse response lengths, and therefore available diversity order are considered, with convolutional codes of different rates and constraint lengths, and also turbo-codes We show that on all channels SC-FDE has better performance with codes having smaller minimum distance However with more powerful codes, which enable it to exploit the full frequency diversity available in the channel, OFDM has better performance, particularly on channels with greater diversity

Method for phase and symbol synchronization, channel estimation and frequency domain equalization of SC-FDE system

Abstract: The invention discloses a method for phase and symbol synchronization, channel estimation and frequency domain equalization of an SC-FDE system, wherein a receiver in the method performs frame synchronization, fraction multiplication channel estimation and fraction multiplication frequency domain equalization on an over-sampling signal, and eliminates influences cause by carrier phases, multipathinterferences and frame synchronization errors through the fraction multiplication channel estimation and the fraction multiplication frequency domain equalization so as to achieve the timing synchronization and the frequency domain equalization of a carrier phase and a symbol of a modulated signal. The method has the characteristics of strong anti-multipath capability, capability of estimating and equalizing a multipath channel with fraction multiplication symbol period intervals, no limitation to signal demodulation mode and signal demodulation and detection method and the like, and is especially suitable for single-carrier frequency domain equalization and synchronization of modulation (such as FQPSK modulation, SOQPSK modulation, CPM modulation and other efficient linear modulations) signals with efficient power and spectrum.

Comparison of the sensitivity of OFDM and SC-FDE to CFO, SCO and IQ imbalance

Abstract: To better answer the user needs, new air interfaces are currently being selected for the emerging wireless communication systems. OFDM and SC-FDE are two interesting alternatives that support both the low complexity equalization of the multi-path channels. Even if the two systems benefit approximately from the same performance, they behave significantly differently in the presence of synchronization errors and front-end non-idealities. The goal of this paper is to assess the impact of CFO, SCO and IQ imbalance on the performance of the OFDM and SC-FDE systems.

Asymptotically optimal low-complexity SC-FDE in data-like co-channel interference

Abstract: In this paper, the design of a low-complexity linear equalizer is considered for single-carrier (SC) block transmission in the presence of inter-symbol interference (ISI) and data-like co-channel interference (CCI). Unlike the linear minimum mean-squared error (LMMSE) frequency-domain equalizer (FDE) designed to suppress ISI only, the LMMSE FDE suffers from high computational complexity due to the CCI component in the signal correlation matrix. Motivated by the fact that the double Fourier transform of the autocorrelation function of a wide-sense cyclostationary process consists of impulse fences with equal spacing, a low-complexity FDE is proposed that approximates the frequency-domain correlation matrix of the CCI plus noise by a block matrix with diagonal blocks. It is shown that the proposed FDE is asymptotically optimal in the sense that the average mean-squared error (MSE) converges to that of the LMMSE FDE as the block length tends to infinity. It is also shown that the proposed FDE is more numerically stable than the LMMSE FDE when the receive filter is matched to the transmit filter and its output is over-sampled to better capture the cyclostationarity of the CCI. Discussions and numerical results include SC block transmission systems with unique word instead of cyclic prefix, and systems with multiple receive antennas.

Pilot aided timing synchronization for SC-FDE and OFDM: a comparison

Abstract: This paper deals with the pilot aided synchronization techniques for single carrier systems with frequency domain equalization (SC/FDE). This techniques are also useable for OFDM. Normally the following parameters have to be synchronized for a mobile communication system: carrier frequency and phase, clock frequency and phase and the position within a transmitted frame. In mobile communication systems, where multipath propagation occurs, a channel estimation and equalization is additionally necessary. In SC/FDE systems a very efficient, low complexity equalizer is implemented, that furthermore synchronizes the clock and carrier phase automatically. That is an important advantage of SC/FDE versus OFDM. The most critical point in burst communication systems is the frame detection and timing synchronization. This paper compares different techniques for timing synchronization and carrier frequency offset estimation.