A New Incomplete Decode-and-Forward Protocol

Efficient relay selection scheme using regenerative and degenerative protocols for 5th generation WiMAX systems

“…In the existing work FER reduces to 10 −4 at 40 dB in Non-orthogonal amplify and forward (NAF) protocol [28]. FER reduces to 10 −4 at 50 dB in Adaptive amplify and forward (AAF) [29]. In the graph shown in Fig.…”

Diophantine approximation approach for incomplete decoding at relays

“…The IDF protocol has been proposed in [4]. Its transmission frame is very similar to the one of the NAF protocol [6].…”

“…In [4], we proposed the Incomplete DF protocol providing both full rate of 1 symbol per channel use and full diversity order (K+1) (where K is the number of relays). The main idea of this protocol is to perform only an incomplete decoding at the relays.…”

“…Based on the structure of the distributed TAST code, a two-step decoding method was defined, allowing to reformulate the problem as a search in two-dimension, whatever the number of relays. In [4] the incomplete decoding is performed using an exhaustive search. However, this exhaustive search induces a high processing complexity.…”

“…In order to combine diophantine approximation with the two-step decoding proposed in [4], we also propose an other modification of this algorithm to the case where θ = e i π 4 . Simulation results show that the use of a diophantine approximation at relay induces only a small loss in performance, highly counterbalanced by the decrease of processing complexity.…”