Capacity of Wideband Multipath Fading Networks with Physically Degraded Broadcast In this work we investigate the capacity of multilayer relaying networks operating over multipath fading channels under a noncoherent wideband regime and physically degraded broadcast stages. First, based on hypergraph models and network equivalence techniques, we derive an upper bound on the network capacity. Then, by considering a peaky, frequencyshift keying signaling scheme, we establish a set of pointtopoint achievable rates for each communication link in the network. Finally, by capitalizing on this set of rates we devise an achievable transmission scheme for the entire network via network coding. Remarkably, it turns out that this achievable rate for the network coincides with its upper bound capacity. In other words, these results give ultimately the capacity of the investigated network.

Bit error rate performance analysis of ACMAP in multiple input single output wireless relay network In this paper, we propose a joint decoding scheme called ACMAP decoder for multiple input single output (MISO) wireless cooperative communication network that consists of single source, single relay, and single destination. The proposed scheme is based on both Alamouti combining (AC) scheme and maximum a posteriori (MAP) decoder and is used to estimate the data at the destination. The ACMAP decoder is optimal in the sense that it minimizes the endtoend bit error rate (BER). In order to analyze performance of the proposed decoder, we derive a closed form expression for the upper bound (UB) on the endtoend error probability. Distances between system nodes, transmit energy, and channel noise and fading effects are considered in the derivation of the UB. Numerical results show that the closed form UB is very tight and it almost coincides with the exact BER results obtained from simulations. Therefore, we use the derived UB expression to study the effects of the relay position on the BER performance and to find the optimal location of the relay node.