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Coordinated beamforming (CBF) or coordinated scheduling is regarded as an effective means of mitigating the intercell interference (ICI) in orthogonal frequency-division multiplexing (OFDM) systems. In this paper, a new CBF scheme is presented based on leakage-controlled minimum-mean-square-error (LC-MMSE) precoding. We use a regularized factor to maximize the signal-to-interference-plus-noise-ratio...
The Physical Downlink Control Channel (PDCCH) is used to signal dynamic resource assignment information in the Long Term Evolution (LTE) system. In the presence of numerous active users, the system performance is likely to be hindered by shortage of control channel resource. In this paper, several simple algorithms are brought forward for making efficient PDCCH resource allocation. We first propose...
Installing multiple antennas at user equipments (UEs) may pose great challenges. In virtual multiple-input multiple-output (MIMO) concept, multiple single-antenna UEs can be grouped to transmit signals at the same time. Their signals can be separated at the base station (BS) by the same methods already used in conventional point-to-point MIMO scenarios. An important problem in virtual MIMO application...
The inter-cell interference in the downlink for IEEE 802.16 wireless metropolitan area network (MAN) mainly depends on the distance between the base station (BS) and the subscriber station (SS). In order to improve the spectrum efficiency and make the frequency reuse factor approach 1.0, the wireless scheduling for supporting the diverse quality of service (QoS) should consider the other-cell interference...
In this paper, channel aware adaptive resource allocation scheme in two-hop wireless relay networks (WRNs) is proposed to achieve maximum system throughput and better delay performance. Both the routing selection and resource scheduling algorithm are designed to accomplish the resource allocation scheme. Considering the network throughput, a routing algorithm is proposed to select the optimal RS based...
This paper proposes an functional architecture supporting wireless mesh networks (WMNs) for IEEE 802.16 standard. Three essential techniques: collision avoiding, packet scheduling and wireless routing are intensively investigated. Based on the mesh extension of IEEE 802.16 medium access control (MAC) layer protocol and the relay-based characteristic of WMNs, the algorithms concerning with those three...
We consider the problem of centralized multihop scheduling in wireless mesh networks for solutions to realize intelligent transportation systems. A scheduling tree construction strategy is investigated, which could use any predetermined selection metrics, while avoiding primary and secondary interferences to a great extent. Two centralized multihop scheduling algorithms are presented to schedule nodes...
In this paper, we consider the problem of routing and scheduling to form a centralized spatial reuse designing framework for fixed multihop relay wireless access networks. Both minimal hopcount and maximal signal strength strategies to construct a routing tree are investigated. New scheduling algorithm is presented to schedule links on a tree level basis. In contrast with graph coloring, the new method...
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