Topic
SC-FDE
About: SC-FDE is a research topic. Over the lifetime, 438 publications have been published within this topic receiving 7547 citations.
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TL;DR: This letter proposes a unique-word-based single-carrier system with frequency-domain decision feedback equalization (FD-DFE) for space-time block coded (STBC) transmissions and greatly reduces an error propagation, thus yielding an improved performance as the number of feedback taps increases.
Abstract: This letter proposes a unique-word-based single-carrier (UW-SC) system with frequency-domain decision feedback equalization (FD-DFE) for space-time block coded (STBC) transmissions. The STBC scheme can not be directly applicable to the UW-SC system, because its transmit sequence is reversed in the time-domain. To cope with this problem, we first design a new transmit sequence to fulfill the theorem of circular convolution, and propose a new corresponding receiver structure to have the transmit diversity. Unlike the cyclic prefixed SC system with FD-DFE, the proposed UW-SC system with FD-DFE greatly reduces an error propagation, thus yielding an improved performance as the number of feedback taps increases
21 citations
01 Dec 2010
TL;DR: This paper shows how unique words can also be introduced in OFDM symbols and introduces correlations between subcarrier symbols, and discusses the similarities and differences of UW-SC/FDE and UW-OFDM transmitter/receiver processing.
Abstract: The concept of using unique word (UW) prefixes instead of cyclic prefixes (CPs) is already well investigated for single carrier systems with frequency domain equalization (SC/FDE). In OFDM (orthogonal frequency division multiplexing), where the data symbols are specified in frequency domain, the introduction of UWs — which are specified in time domain — is not that straight forward. In this paper we show how unique words can also be introduced in OFDM symbols. In OFDM our proposed method introduces correlations between subcarrier symbols. This allows to apply a highly efficient LMMSE (linear minimum mean square error) receiver. Throughout this paper we discuss the similarities and differences of UW-SC/FDE and UW-OFDM transmitter/receiver processing, and we present simulation results in indoor multipath environments.
21 citations
06 Oct 2014
TL;DR: This paper proposes a novel CP selection technique that conceals the cyclic features of the signal while maintaining the advantages in equalization without reducing spectral efficiency.
Abstract: Cyclic prefix (CP) utilizing techniques such as orthogonal frequency division multiplexing (OFDM) and single carrier frequency domain equalization (SC-FDE) offer significant advantages in equalizing the effect of time dispersive channels at the expense of a reasonable spectral redundancy. However, cyclic features introduced by CP to the signal can also be exploited for blind parameter estimation and synchronization which compromise the security and privacy of the signal against eavesdropping attacks. In this paper, we propose a novel CP selection technique that conceals the cyclic features of the signal while maintaining the advantages in equalization without reducing spectral efficiency. After presenting the proposed technique, its performance is discussed for OFDM and SCFDE in terms of bit-error rate and complexity as well as cyclic feature suppression.
21 citations
TL;DR: This paper considers the use of single carrier (SC) modulations combined with frequency-domain equalisation (FDE) in future broadband wireless systems and proposes iterative receiver structures with joint equalisation and carrier synchronisation.
Abstract: In this paper we consider the use of single carrier (SC) modulations combined with frequency-domain equalisation (FDE) in future broadband wireless systems. We propose iterative receiver structures with joint equalisation and carrier synchronisation. The proposed receivers can be regarded as modified frequency-domain turbo equalisers where we perform a decision-directed frequency offset estimation within each iteration of the turbo equaliser.
Our performance results show that the proposed receiver structure has good bit error rate (BER), even with moderate frequency offsets and in severely time-dispersive channels. Moreover, our receiver has a relatively low implementation complexity, due to its fast Fourier transform (FFT)-based frequency-domain implementation. Copyright © 2010 John Wiley & Sons, Ltd.
21 citations
TL;DR: A sub-block processing to extract the phases and applies the least-squares regression to jointly estimate the offsets is proposed and the effectiveness of the proposed SC-FDE receiver is demonstrated on multipath fading channels.
Abstract: With single-carrier frequency-domain equalization, the carrier-frequency and sampling-frequency offsets are embedded in the phases of complex frequency-domain signal components. This paper proposes a sub-block processing to extract the phases and applies the least-squares regression to jointly estimate the offsets. The effectiveness of the proposed SC-FDE receiver is demonstrated on multipath fading channels.
21 citations