Changes between Version 10 and Version 11 of BuildingCooperativeComm

Timestamp:

Jan 31, 2009, 8:59:03 PM (15 years ago)

Author:

murphpo

Comment:

--

BuildingCooperativeComm

@@ -4 +4 @@
 
 == Abstract ==
-IIn this paper, we present the results from over-the-air experiments of a complete implementation of  an amplify and forward cooperative communications system. Our custom OFDM-based physical layer  uses a distributed version of the Alamouti block code, where the relay sends one of the branches of  Alamouti encoded symbols. First we show analytically and experimentally that amplify and forward  protocols are unaffected by carrier frequency offsets at the relay. This result allows us to use a conven-  tional Alamouti receiver without change for the distributed relay system, thereby allowing cooperative  systems to reuse components of current (non-cooperative) systems. Our full system implementation  shows gains up to 5.5dB in peak power constrained networks. Thus, we can conclusively state that even  the simplest form of relaying can lead to significant gains in practical implementations.  
+In this paper, we present the results from over-the-air experiments of a complete implementation of  an amplify and forward cooperative communications system. Our custom OFDM-based physical layer  uses a distributed version of the Alamouti block code, where the relay sends one of the branches of  Alamouti encoded symbols. First we show analytically and experimentally that amplify and forward  protocols are unaffected by carrier frequency offsets at the relay. This result allows us to use a conven-  tional Alamouti receiver without change for the distributed relay system, thereby allowing cooperative  systems to reuse components of current (non-cooperative) systems. Our full system implementation  shows gains up to 5.5dB in peak power constrained networks. Thus, we can conclusively state that even  the simplest form of relaying can lead to significant gains in practical implementations.