Resource allocation with multicell processing, interference cancelation and backhaul rate constraint in single carrier FDMA systems

We consider a cellular system where base stations (BSs) cooperate to receive data from mobile terminals (MTs) using single carrier frequency division multiple access (SC-FDMA). This yields a distributed multiantenna system, with corresponding multicell processing gain. Moreover, the exchange of information among BSs is limited due to the rate constraint on the backhaul network. A first contribution of the paper is a scheduler of the signals shared among BSs on the backhaul with the objective of maximizing the SC-FDMA system sum rate. A greedy algorithm is proposed as a viable solution of the problem. A fundamental feature of the scheduler is that BSs may share received signals only within a subset of the subcarriers of each SC-FDMA block. As a further contribution of the paper, to increase the system sum rate, we also consider interference cancelation, where BSs detect some messages without cooperation, and transmit on the backhaul a suitable linear combination of received and detected signals. The scheduling problem is suitably modified to take into account interference cancelation, thus selecting the MTs for which detection occurs before sharing the signal on the backhaul. Numerical results for typical cellular configurations are presented.