Trellis Based Conflict Resolution Algorithm and Coefficient Computation for FIR Bidirectional DFE
Date Issued
2004
Date
2004
Author(s)
Wong, Chan Wong
DOI
en-US
Abstract
In wireless communication system, intersymbol interference (ISI) is long identified as a major impairment. ISI, if left uncompensated, causes high error rates. A suboptimal detector, namely the decision feedback equalizaer (DFE), is widely use in practice for ISI mitigation due to its simple implementation. DFE suffers from error propagation that causes performance degradation. Bidirectional equalization of the received signal can be used to enhance the performance of DFE. Bidirectional DFE consists of a traditional DFE in parallel with another DFE operating on the time-reversed sequence of the received signals. In this thesis, we propose two approaches, which are based on the observation in the trellis diagram, for resolving conflict events between the outputs of two DFEs. We also demonstrate that, with only little increase in computation complexity, the proposed trellis based conflict resolution (TBCR) and TBCR-piecewise maximum likelihood sequence estimator (TBCR-PWMLSE) are more robust than other algorithms. We also propose two methods for calculating the reverse DFE’s coefficients from that of forward DFE, thus reducing the complexity of computing the DFEs’ coefficients by half.
Subjects
格狀型
衝突排解
雙向決策回授等化器
Bidirectional DFE
Trellis Based
Conflict Resolution
SDGs
Type
thesis
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