Abstract
In this paper, we consider the error probability for multilevel pulse
amplitude modulated (PAM) signals, which are used with a multipath
diversity combiner based on energy detection (ED). A distinctive feature
of ED combined with nonconstant envelope signals is that the symbol
decision thresholds need to be determined from a non-Gaussian
distributed decision variable. We first present a novel theoretical
analysis framework which provides a basis to predict the error
performance of ED-PAM systems with optimal maximum likelihood decision
thresholds in general multipath fading channels with arbitrary number of
degrees of freedom. We then use frequency-selective lognormal fading
channels as a case example and evaluate simple approximations for the
error probability. Moreover, the analysis is extended to include the
joint effect of systematic and random threshold deviation on the error
probability with suboptimal but practical data-aided threshold
estimation.
Original language | English |
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Pages (from-to) | 111-122 |
Number of pages | 12 |
Journal | Physical Communication |
Volume | 4 |
Issue number | 2 |
DOIs | |
Publication status | Published - 2011 |
MoE publication type | A1 Journal article-refereed |
Keywords
- Energy detection
- Error probability
- Diversity combining
- Pulse amplitude modulation
- Optimal decision thresholds
- Data-aided estimation