Dynamic power allocation for multi-hop linear non-regenerative relay networks

Abstract

Abstract-In this paper, we analyze the optimal power allocation for the multihop linear nonregenerative relay cooperative system. The expression for the end-to-end SNR is deprived in terms of power allocation factors to each node and the channel state information, based on which, we obtain the optimal power allocation factors for each nodes by maximizing the end-to-end SNR subject to the total power constraint. Numerical simulations show that the theoretical prediction matches the simulation, and dynamic power allocation outperforms the fixed power allocation scheme.Index Terms-multihop linear relay networks, amplify-andforward, end-to-end SNR, power allocation.

Optimisation of power allocation for asymmetric relay placement in multi‐hop relay systems

“…In case of OPA based on GCSI, the optimised powers at the transmitting nodes are obtained using (36), and (46) for a DF multi-hop system and using (58) for a hybrid system. For comparison, the results in [15] for the OPA in a AF multi-hop system are also shown in Figs. 3 and 4.…”

“…In [15], an expression for optimised power allocation at transmitting nodes is derived for an AF multi-hop system using the approximate expression of the total instantaneous end-to-end SNR. The optimisation problem is formulated for the kth AF section of the hybrid relaying system connecting nodes R a 1 +···+a k−1 +k−1 to R a 1 +···+a k +k using (6) and (51) as max P a 1 +···+a k−1 +k ,...,P a 1 +···+a k +k a 1 +···+a k +k…”

“…Hybrid relaying offers advantages of both AF and DF relaying whereas compromising on their shortcomings. AF relaying offers reduced complexity and deteriorated performance because of the propagation over multiple hops, whereas DF relaying offers performance advantage but adds delay over multiple stages [15]. Thus, to take up the advantages of both AF and DF relaying while compromising on their shortcomings, we can use consecutive DF relay nodes in adverse channel conditions and consecutive AF nodes in favourable channel conditions.…”

“…In [15], an expression for optimised power allocation at transmitting nodes is derived for an AF multi-hop system using the approximate expression of the total instantaneous end-to-end SNR. The optimisation problem is formulated for the kth AF section of the…”