Title :
Relay-Assisted Diversity Communications
Author :
La Palombara, C. ; Tralli, Velio ; Masini, Barbara ; Conti, Andrea
Author_Institution :
DEIS, Univ. of Bologna, Bologna, Italy
Abstract :
Relaying and diversity methods improve wireless communications by jointly exploiting the benefits of node cooperation, multiple-channel reception, and distributed processing. We develop a framework for design and analysis of relay-assisted diversity communications accounting for: 1) node positions; 2) link characterization; 3) diversity methods; 4) distributed coding and constellation signaling; and 5) power allocation. The framework is built on a simple model for assessing the frame error probability (FEP) as a function of radio-link characteristics, and it enables a clear understanding of how the aforementioned aspects affect the performance. A novel FEP-optimal power allocation is developed and compared with other allocation techniques such as uniform, destination-balanced (D-balanced), and relay-balanced (R-balanced) power allocations. Results show the effectiveness of the novel power allocation technique for various distributed codings and provide insights into the operation of relay-assisted diversity systems.
Keywords :
cooperative communication; diversity reception; encoding; error statistics; radio links; relay networks (telecommunication); telecommunication signalling; wireless channels; D-balanced power allocation; FEP-optimal power allocation; R-balanced power allocation; constellation signaling; destination-balanced power allocation; distributed coding; distributed processing; frame error probability; link characterization; multiple-channel reception; node cooperation; node position; radio-link characteristics; relay-assisted diversity communication; relay-balanced power allocation; wireless communication; Approximation methods; Argon; Diversity methods; Encoding; Relays; Resource management; Strontium; Distributed coding; diversity techniques; power allocation; relay-assisted communications;
Journal_Title :
Vehicular Technology, IEEE Transactions on
DOI :
10.1109/TVT.2012.2218841