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Abstract In a demodulate-and-forward (DF) based cooperative communication system, erroneous relaying of the data leads to degradation in the performance of the destination receiver. However, a maximum likelihood (ML) decoder in the destination can improve the receiver performance. For achieving a diversity gain, the Alamouti space-time block code (STBC) can be used in the DF based cooperative system in a distributed manner. In this system, we derive an ML decoder of the distributed Alamouti STBC for the DF based cooperative system with two imperfect relaying nodes. We also consider a DF cooperative communication system in which one out of two relays is in outage. A piece-wise linear (PL) decoder for the DF cooperative system with the distributed Alamouti code and one relay in outage is proposed. The PL decoder provides approximately the same performance as that of the ML decoder with reduced decoding complexity.
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Decoding and Performance Bound of Demodulate-and-Forward
Based Distributed Alamouti STBC
Abstract
In a demodulate-and-forward (DF) based cooperative communication system,
erroneous relaying of the data leads to degradation in the performance of the
destination receiver. However, a maximum likelihood (ML) decoder in the destination
can improve the receiver performance. For achieving a diversity gain, the Alamouti
space-time block code (STBC) can be used in the DF based cooperative system in a
distributed manner. In this system, we derive an ML decoder of the distributed
Alamouti STBC for the DF based cooperative system with two imperfect relaying
nodes. We also consider a DF cooperative communication system in which one out of
two relays is in outage. A piece-wise linear (PL) decoder for the DF cooperative system
with the distributed Alamouti code and one relay in outage is proposed. The PL
decoder provides approximately the same performance as that of the ML decoder with
reduced decoding complexity. We derive the pairwise error probability (PEP) of the
proposed ML decoder with binary phase-shift keying constellation. An optimized
transmits power allocation for the relay is performed by minimizing an upper bound of
the PEP. It is shown by simulations that the proposed ML decoder enables the DF
protocol based cooperative system to outperform the same rate amplify-and-forward
protocol based cooperative system when both systems utilize the distributed Alamouti
STBC.
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Abstract Existing System Disadvantages Proposed System Advantages Objective System Requirements System Architecture
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![A Novel Differential Modulation Scheme Using Full-Rate ...was derived from STBC Alamouti [5]. In [3], Ganesan . et al. also proposed a DM technique for 4×4 MIMO. This proposed technique](https://img.pdfslide.us/doc/110x75/5ff87b1a5b15b56e940e9eb1/a-novel-differential-modulation-scheme-using-full-rate-was-derived-from-stbc.jpg)
