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Over the air testing of multiple antenna systems has attracted great attention in recent years. The research and standardization work have been focused on evaluating user equipment (UE) in two dimension (2D) radio propagation channel models. This paper proposes two future direction of over the air testing: 1) performance evaluation of WiFi devices under realistic propagation scenarios and 2) 3D radio...
This paper introduce one novel in-lab test method to reproduce a field radio channel data in lab, and use one recorded field data as an example to evaluate TDD-LTE UE performance. Firstly, it presents the field measurement method based on the scanner, and then to introduce accurate modeling way as conversion to generate in-lab playbacking file and also mapping to support CE based MPAC test solution,...
Network coding and opportunistic routing as transmission technologies of Wireless Mesh Network, which are based on the 802.11 broadcast channel access, have become more sophisticated. It is important to build more accurate models on broadcast channel access to analyze performance, such as throughput, delay, fairness and contention. This paper describes behavior of network nodes based on MAC layer...
The recent development on network coding techniques has attracted much attention, with their demonstrated potentials in improving network capacity and reliability, particularly in wireless networks with broadcast capability. While most studies have focused on designing efficient algorithms and protocols to exploit the benefits at lower layers, i.e., the link layer and network layer, we reveal the...
Based on considering the CODEC frame duration, this paper proposes a superior uplink scheduling algorithm that can efficiently support multiple DTX VoIP CODECs over M-WiMAX, and be able to facilitate the uplink resource wastes during silence period and optimize the system VoIP capacity. The BS uplink resource allocation procedure is planned and adapted according to the reserved bit in the Bandwidth...
This paper proposes an efficient uplink scheduling algorithm that can perfectly support various VoIP CODECs with VAD/DTX/CNG in M-WiMAX considering the variants of silence duration between different voice users, solving the problems of uplink resources wastes and overwhelmingly large overhead that caused during silence period. In our proposed algorithm, efficient schemes is proposed to implement the...
In this paper, an innovative scheduling is designed for multi-hop multicast in wireless mesh networks, with utilization of concurrent transmission strategy. Since the performance of a multicast mechanism is constrained in a wireless setting due to the interference among local wireless transmissions, we analyze the interference relationships firstly among the transmissions by introducing a graph transformation...
Wireless mesh networks have promised to provide high-speed access for residential or mobile customers. And concurrent transmission is an effective way to enhance system throughput in wireless mesh networks. The objective of this paper is to provide an effective concurrent transmission method to enlarge throughput with specific QoS fairness guarantee in wireless mesh networks. Firstly, link relationship...
WiMax mesh networks based on IEEE 802.16 standard have promised to deliver high data rates over large areas and to be deployed easily. Optimum routing and scheduling of flows can do favor for capacity enlargement. The objective of this paper is to provide a routing-construction method with larger scale applicability and a concurrent transmission scheduling strategy to improve the performance during...
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