Abstract
Most of the multimedia and Internet services today are asymmetric in nature, and require high data rate support. Allocating equal band width in both uplink and downlink is not prudent solution, as most of the time user requirement is more either in uplink or downlink. The Multi Carrier Code Division Multiple Access (MC-CDMA) system with time division duplex mode can easily met this requirement by dynamically declaring traffic direction in TDD slot, and adaptively allocating the sub channels. In this paper, we propose a adaptive slot and sub carrier allocation algorithm, that can be independently implemented in each cell of mobile communication network. Our analytical model is generalization of two cell concept to represent a multi cell model. Based on two cell concept four cases of interference pattern has been considered and simulated separately in presence of Additive White Gaussian Noise (AWGN) and Rayleigh Channel. The simulated result suggests the requirement of approximately 9dB of Signal to Noise Ratio (SNR) to maintain Bit Error Rate below 10-3. We also analyze the average delay incurred by the proposed algorithm in allocating resources.
Highlights
The explosive growth in multimedia and Internet applications necessitates the development of generation mobile networks
The conventional code-division multiple-access (CDMA) technique used in third generation system faces serious limitations by fading problem in channel, causing Inter Symbol Interference (ISI), and it requires advanced signal processing algorithms to contain it [3]
We first talk about different components of end to end delay, but our main focus is on processing delay due to resource allocation algorithm at base station
Summary
The explosive growth in multimedia and Internet applications necessitates the development of generation mobile networks. The conventional code-division multiple-access (CDMA) technique used in third generation system faces serious limitations by fading problem in channel, causing Inter Symbol Interference (ISI), and it requires advanced signal processing algorithms to contain it [3]. Due to multiple reflections from various objects, the electromagnetic waves reach the receiver along different paths of varying lengths The interaction between these waves causes multipath fading at a specific location, and decreases the strength of the radio wave with respect to the increase in distance from transmitter. Single carrier systems are simple but can’t support high data rates efficiently in fading channels. The multi carrier system can improve performance in bad channel conditions, and support high data rates while maximizing the capacity of the system.
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