Abstract
In order to improve the multicast transmissions, a full-duplex (FD) user cooperation scheme is proposed. In this paper, the transmitter sends the common messages to two FD users, and each user forwards its received signals to its counterpart by amplify-and-forward (AF) scheme. Considering the imperfect self-interference (SI) cancellation at the users and the AF scheme, the residual self-interference and the additive noise (RIAN) is shown to be accumulated over time. This paper first analyzes the equivalent channel model of the considered system, as well as the asymptotic statistics of the accumulated RIAN. Then, with the forward and backward decoding schemes, the corresponding achievable rates are derived, and the optimal power allocation is obtained via solving a max-min problem. In particular, one-side cooperation scheme (i.e., only one user forwards its received signal to its counterpart) is shown to be optimal to achieve the best system performance.
Highlights
Data services in cellular networks, such as music sharing, video streaming, and downloading pictures, are growing explosively in recent years, and will continue to increase in the future [1]
The authors in [18]–[20] investigated the energy efficiency of the multicast transmissions with the DF user cooperation scheme, and the optimal power allocation was obtained for the users [18] and the transmitter [19], respectively
Motivated by the above reasons, this paper considers the FD user cooperation with the AF scheme for multicast transmissions
Summary
Data services in cellular networks, such as music sharing, video streaming, and downloading pictures, are growing explosively in recent years, and will continue to increase in the future [1]. L. Du et al.: Multicast Transmissions With FD AF User Cooperation (i.e., the user first decodes the received signal, and re-encodes the data and forwards to its counterpart [21].) had been considered, and the achievable rate of the considered channel was obtained. The authors in [18]–[20] investigated the energy efficiency of the multicast transmissions with the DF user cooperation scheme, and the optimal power allocation was obtained for the users [18] and the transmitter [19], respectively. We prove that one-side cooperation (i.e., only one user forwards its received signal to its counterpart) is optimal Based on this result, the original rate maximization problem is solved by using the max-min technique and fractional programming.
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