Smart Antenna Based OVSF Code Assignment for WCDMA Networks |
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Authors: | Adnan Kavak Mustafa Karakoc |
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Institution: | (1) Wireless Communications and Information Systems Research Center, Department of Computer Engineering, Kocaeli University, Izmit, Kocaeli, 41040, Turkey;(2) Radio Network Division, Turkcell Telecommunication Services, Kartal, Istanbul, 34880, Turkey |
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Abstract: | This paper presents a new method for dynamic allocation of orthogonal variable spreading factor (OVSF) codes in WCDMA networks
where each base station is equipped with an adaptive antenna array (AAA). Previous works about OVSF code assignment problem
deal with the code limited case. Here, we investigate the feasibility to turn the problem into the SIR limited case. With our scheme, the new call request is allocated an OVSF code that may be currently used by an active user whose
downlink beam has the smallest spatial correlation with the channel vector of the requesting user, as long as desired SIR
level is achieved. The performance of the new scheme is justified through computer simulations under different traffic load
conditions. |
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Keywords: | Adaptive antenna arrays OVSF Resource management Spatial diversity WCDMA Code assignment Smart antennas 3G SIR estimation Spectral efficiency |
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