Showing papers on "SC-FDE published in 2002"
TL;DR: This article surveys frequency domain equalization (FDE) applied to single-carrier (SC) modulation solutions and discusses similarities and differences of SC and OFDM systems and coexistence possibilities, and presents examples of SC-FDE performance capabilities.
Abstract: Broadband wireless access systems deployed in residential and business environments are likely to face hostile radio propagation environments, with multipath delay spread extending over tens or hundreds of bit intervals. Orthogonal frequency-division multiplex (OFDM) is a recognized multicarrier solution to combat the effects of such multipath conditions. This article surveys frequency domain equalization (FDE) applied to single-carrier (SC) modulation solutions. SC radio modems with frequency domain equalization have similar performance, efficiency, and low signal processing complexity advantages as OFDM, and in addition are less sensitive than OFDM to RF impairments such as power amplifier nonlinearities. We discuss similarities and differences of SC and OFDM systems and coexistence possibilities, and present examples of SC-FDE performance capabilities.
2,475 citations
TL;DR: An iterative block decision feedback equaliser (IB-DFE) for single carrier modulation is proposed which operates on blocks of the receive signal, thus allowing the use of error correction codes on the feedback data signal.
Abstract: An iterative block decision feedback equaliser (IB-DFE) for single carrier modulation is proposed. Filtering operations are implemented by discrete Fourier transforms (DFTs) which yield a reduced computational complexity, for both filter design and signal processing, when compared to existing DFEs. Moreover, the new IB-DFE operates on blocks of the receive signal, thus allowing the use of error correction codes on the feedback data signal.
253 citations
10 Dec 2002
TL;DR: It is shown that the UW fulfils the theorem of cyclic convolution required for efficient implementation of the SC/FDE structure and elaborate on the advantages that result for equalization, channel estimation, and synchronisation.
Abstract: We investigate the use of a known symbol sequence - a so-called unique word (UW) - instead of the well-known cyclic prefix (as it is used in OFDM, orthogonal frequency division multiplexing, systems) for a single carrier system with frequency domain equalization (SC/FDE). The considered SC/FDE system is similar to the one proposed in the IEEE 802.16.3c target group. It is shown that the UW fulfils the theorem of cyclic convolution required for efficient implementation of the SC/FDE structure. We elaborate on the advantages that result for equalization, channel estimation, and synchronisation. Compared to the advantages, the disadvantages in terms of BER behaviour and bandwidth efficiency are rather modest.
68 citations
16 Dec 2002
TL;DR: This work investigates the advantages of a known symbol sequence - a so-called unique word (UW) - instead of the well-known cyclic prefix (as is used in OFDM systems) for a single carrier system with frequency domain equalization (SC/FDE).
Abstract: In this work we investigate the advantages of a known symbol sequence - a so-called unique word (UW) - instead of the well-known cyclic prefix (as is used in OFDM systems) for a single carrier system with frequency domain equalization (SC/FDE). The concept of UW fulfills the theorem of cyclic convolution - required to implement an efficient equalization for the SC/FDE structure. We elaborate on the advantages that result for decision feedback equalization (DFE) in detail. It is shown that a DFE based on the concept of UW shows significant advantages in comparison to a traditional time domain DFE or a DFE based on cyclic prefix. Simulation results confirm the theoretical advantages.
27 citations
16 Dec 2002
TL;DR: This paper compares the performance of higher-order modulation schemes and coding rates for a single carrier system with frequency domain equalization (SC/FDE) and orthogonal frequency division multiplexing (OFDM).
Abstract: This paper compares the performance of higher-order modulation schemes and coding rates for a single carrier system with frequency domain equalization (SC/FDE) and orthogonal frequency division multiplexing (OFDM). The effects of cyclic prefix and blockwise equalization for SC/FDE are investigated in detail. It is shown that blockwise processing leads to a deterioration in terms of BER behavior - especially for higher modulation formats such as 16 QAM or 64 QAM. The most reliable solution to this problem is coding. Applying a high-rate code compensates the investigated effect completely. The achieved BER behavior is compared with the results of an OFDM system.
3 citations