Downlink performance analysis of DS-CDMA system with base station diversity

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Shekhar, Hemabh
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Electrical and Computer Engineering

The Department of Electrical and Computer Engineering (ECpE) contains two focuses. The focus on Electrical Engineering teaches students in the fields of control systems, electromagnetics and non-destructive evaluation, microelectronics, electric power & energy systems, and the like. The Computer Engineering focus teaches in the fields of software systems, embedded systems, networking, information security, computer architecture, etc.

The Department of Electrical Engineering was formed in 1909 from the division of the Department of Physics and Electrical Engineering. In 1985 its name changed to Department of Electrical Engineering and Computer Engineering. In 1995 it became the Department of Electrical and Computer Engineering.

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  • Department of Electrical Engineering (1909-1985)
  • Department of Electrical Engineering and Computer Engineering (1985-1995)

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In this thesis we study the performance of DS-CDMA downlink with base station diversity (BSD), since most of the works till date have concentrated on uplink. A BSD architecture is considered with three base stations (BSs) per cell and its performance compared against the conventional cellular network with one BS per cell. A mobile station (MS) will be connected to multiple BSs in its cell. In downlink each BS will transmit same data to the MS using certain power control scheme. Three power control schemes have been studied. One scheme distributes the power equally among all the BSs communicating to a certain MS, maintaining a constant transmit power. Second scheme maintains a constant power at the MS receiver taking into account the path loss. Third scheme analyzed is the famous water filling solution to compute the transmitted power in each BS-MS channel keeping the total power level constant. This scheme will have the advantage that transmitted power from each base station will be changed adaptively based on the channel SNR and interference conditions to provide maximum channel capacity. However it has been concluded from this work that this scheme is suitable for a MIMO system unlike this work which considers a MISO system. A conventional matched filter receiver is implemented at the MS. The communication channel has been modeled to have AWGN, frequency non-selective fast rayleigh multipath fading, considering the effect of path loss and MAI.

Tue Jan 01 00:00:00 UTC 2002