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Congestion is regarded as one of the main reasons for the performance decrease in wireless networks,which exists in 802.16 wireless networks too. To control congestion better, this paper proposes an active queue management (AQM) algorithm named WDBQ (wireless delay-based queue) according to the characteristic of 802.16 wireless networks. The algorithm detects congestion by using packet queueing delay,...
In this paper we analyze the end-to-end capacity of subcarrier pairing strageties of OFDMA-base DF relay link over Rayleigh fading channels. We compare fixed pairing strategy to optimal pairing strategy in the circumstance that the relay is fixed or mobile.The main contribution of this paper is deriving the closed-form expressions for average end-to-end SNR and capacity in these circumstances. The...
TCP seems helpless, facing fast-growing high bit-rate Internet applications like streaming media. But UDP, the alternative choice, lacks congestion control and does not guarantee packets arrival. We study the UDP transmission situation by experiments, and build the mathematic and physical models. Then we propose minimum rate distortion based scheduling for streaming media. Considering the structure...
In this paper, a beamspace-based pre-FFT beam-forming algorithm is proposed for orthogonal frequency division multiplexing (OFDM) systems with antenna arrays in multi-path fading channels. In the receiver, multiple beams are generated firstly to cover the direction of arrival (DOA) range from 0 to 360 degrees. Then one or more delayed paths with large power are estimated by correlation process and...
The call blocking probability (CBP) is one of the major parameters imposed to describe the quality of service (QoS) in network. With the rapid increasing of network scale, conventional Kaufman recursion method and convolution method are unsuccessful for data overflow problem in large-scale multimedia network. In order to accommodate to large-scale multimedia network, revised Kaufman method and revised...
In this paper, the authors propose a new optimization method of path bandwidth allocation for large-scale telecommunication networks. By using the decomposition-coordination method to get an optimal solution of path bandwidth allocation for large-scale communication networks, a big network is divided into small and inter-connected sub-networks. The path bandwidth allocation procedure is composed of...
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