Transactions on Emerging Telecommunications Technologies

This paper shows that, in heterogeneous networks, a completely proportionally fair scheduler is only possible non-using or wasting a lot of resources. This paper proposes to create clusters of users and nodes so that the allocated rates are completely proportional only inside each cluster. Moreover, this paper presents a mechanism to create the clusters which focuses on maximising the total fairness.

A cross-layer joint optimization approach is proposed for multihop routing in time-division duplex code-division multipleaccess wireless mesh networks. Two timeslot scheduling schemes are investigated for time-division duplex operations. The routing at the network layer, the packet delay at the medium access control layer, and the signal-to-interference-plus-noise ratio at the physical layer are jointly optimized in a cross-layer manner. The results show that the proposed cross-layer optimization algorithm significantly outperforms the shortest-path routing algorithm with respect to overall network performance.

In this paper, we derive the bit error probability of cooperative multicarrier code division multiple access systems using decode and forward relaying. Multihop and dual hop systems are considered. The optimal power allocation for the different nodes is also investigated.

In this paper, several multi-user scheduling algorithms with limited channel feedback are proposed for multi-antenna downlink channels. Multi-user scheduling algorithms are carefully designed to maximize the potential system throughput while reducing the feedback load. Analytical results show that the proposed scheduling with limited channel feedback has a small performance degradation compared with the scheduling with unlimited channel feedback when the thresholds for user scheduling are judiciously designed.

New combining schemes for partial decisions using one-bit and two-bit information of the received samples are derived for Rayleigh fading channels. These new schemes have either better performances or simpler structures, or both.

In this paper, we consider orthogonal frequency division multiplexing and single-carrier with frequency-domain equalisation transmission schemes and study the impact of the number of multipath components and the diversity order on their performance. It is shown that when we have a high number of separable multipath components, the asymptotic performance of both schemes approaches the matched filter bound, even without diversity.

Different reconfigurable optical add/drop multiplexer (ROADM) architectures can be considered for the deployment of wavelength switched optical networks (WSONs). They impose constraints that significantly affect the utilisation of the overall WSON resources. In this paper, dynamic provisioning schemes are proposed to effectively handle different ROADM architectures and provide a preference on the utilisation of add/drop with limited flexibility. The schemes are specifically designed to exploit the recently introduced generalised multiprotocol label switching extensions for the advertisement of capacity/availability of ROADM add/drop resources.

This study investigates a relay-assisted orthogonal frequency division multiple access cellular system with joint consideration of direct and relaying paths. In this system, a novel implementation adopting full-duplex relaying is proposed for joint relay-destination selection, subcarrier and power allocation. This new implementation can be shown to significantly improve spectrum efficiency as compared with the conventional half-duplex relaying orthogonal frequency division multiple access. In addition, the proposed scheme enables flexible controllability on the tradeoff between system capacity and user fairness.