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Title: Frequency-domain equalization for space-time block-coded transmissions over frequency-selective fading channels
Authors: YANG YANG
Keywords: frequency domain equalization;space-time block coding;fading channels;decision-feedback equalizer;adaptive equalizer;channel estimation
Issue Date: 27-Sep-2004
Citation: YANG YANG (2004-09-27). Frequency-domain equalization for space-time block-coded transmissions over frequency-selective fading channels. ScholarBank@NUS Repository.
Abstract: Single-carrier frequency-domain equalization (FDE) and space-time block coding (STBC) are two attractive techniques that have been under intense studies, due to their advantages in increasing the data rate or improving the link quality. With the objective of exploiting the benefits of both techniques, in this thesis, we investigate FDE schemes for STBC block transmissions over frequency-selective fading channels, which are divided into two categories: the channel estimation based FDE and adaptive FDE. For the first category, we present efficient linear and decision-feedback block equalization schemes based on zero-forcing (ZF) and minimum mean-square error (MMSE) criteria. Closed form expressions for tap coefficients of these FDE schemes are derived, and a training based frequency-domain channel estimation scheme is proposed as well. Simulation results indicate the effectiveness of the channel estimation scheme as well as a significant performance improvement as compared to the case of single transmitter with FDE. Regarding the adaptive version, we present a systematic development of adaptive FDE for STBC transmissions based on block adaptive algorithms to realize joint channel estimation and equalization. A frequency-domain diversity combining scheme is also proposed to mitigate the effects of channel variation. The effectiveness of both adaptive FDE and diversity combining schemes is verified by simulations.
Appears in Collections:Master's Theses (Open)

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