Outage probability analysis of an amplify-and-forward cooperative communication system with multi-path channels and max–min relay selection

2013 ◽  
Vol 7 (5) ◽  
pp. 408-416 ◽  
Author(s):  
Masoud M. Eddaghel ◽  
Gaojie J. Chen ◽  
Jonathon A. Chambers ◽  
Usama N. Mannai
Keyword(s):  
Outage Probability ◽  
Cooperative Communication ◽  
Communication System ◽  
Relay Selection ◽  
Probability Analysis ◽  
Amplify And Forward

Single and Double-Differential Coding in Cooperative Communications

2010 ◽  
pp. 321-351 ◽  
Author(s):  
Manav R. Bhatnagar ◽  
Are Hjørungnes
Keyword(s):  
Cooperative Communication ◽  
Communication System ◽  
Cooperative Communications ◽  
Base Station ◽  
Amplify And Forward ◽  
Decode And Forward ◽  
Probability Of Error ◽  
Active User ◽  
Downlink Channels ◽  
Differential Coding

In this chapter, we discuss single and double-differential coding for a two-user cooperative communication system. The single-differential coding is important for the cooperative systems as the data at the destination/relaying node can be decoded without knowing the channel gains. The double-differential modulation is useful as it avoids the need of estimating the channel and carrier offsets for the decoding of the data. We explain single-differential coding for a cooperative system with one relay utilizing orthogonal transmissions with respect to the source. Next, we explain two single-differential relaying strategies: active user strategy (AUS) and passive users relaying strategy (PURS), which could be used by the base-station to transmit data of two users over downlink channels in the two-user cooperative communication network with decode-and-forward protocol. The AUS and PURS follow an improved time schedule in order to increase the data rate. A probability of error based approach is also discussed, which can be used to reduce the erroneous relaying of data by the regenerative relay. In addition, we also discuss how to implement double-differential (DD) modulation for decode-and-forward and amplify-and-forward based cooperative communication system with single source-destination pair and a single relay. The DD based systems work very well in the presence of random carrier offsets without any channel and carrier offset knowledge at the receivers, where the single differential cooperative scheme breaks down. It is further shown that optimized power distributions can be used to improve the performance of the DD system.

Directional AF Cooperative Communication System Based on Outage Probability

2017 ◽  
Vol 13 (2) ◽  
pp. 55-68 ◽  
Author(s):  
Ruilian Tan ◽  
Zhe Li ◽  
Peng Bai ◽  
Kai Shi ◽  
Baoxiang Ren ◽  
...  
Keyword(s):  
Lower Bound ◽  
Outage Probability ◽  
Cooperative Communication ◽  
Communication System ◽  
Signal To Noise Ratio ◽  
Directional Antenna ◽  
Channel Coefficient ◽  
Traditional Mode ◽  
Limited Power ◽  
Single Relay

In order to improve outage property of cooperative communication system, directional antenna technology could be introduced. The paper proposes single relay AF cooperative communication protocol based on directional antenna and deduces the outage probability of system in fully directional mode theoretically so as to deduce the lower bound. With the minimum system outage probability to be the target, the paper analyzes OPA (Optimum Power Allocation) and makes detailed analysis and comparison of the system property of the established model by combining with specific simulation value. The simulation result shows that on the condition of high SNR (Signal to Noise Ratio) or greater difference of channel coefficient between two terminals and relay, the lower bound and accurate value are approximated and the outage property of fully directional cooperative communication is superior to that of traditional mode. Under the situation of limited power, OPA can enhance the outage property of system effectively.

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