Title page for ETD etd-104722369631841

Type of Document Master's Thesis
Author Aliftiras, George
URN etd-104722369631841
Title Receiver Implementations for a CDMA Cellular System
Degree Master of Science
Department Electrical and Computer Engineering
Advisory Committee
Advisor Name Title
Woerner, Brian D. Committee Chair
Bostian, Charles W. Committee Member
Rappaport, Theodore S. Committee Member
  • multiuser receiver
  • CDMA
  • interference cancellation
  • quantization
Date of Defense 1996-07-01
Availability unrestricted
The communications industry is experiencing

an explosion in the demand for personal

communications services (PCS). Several digital

technologies have been proposed to replace

overburdened analog systems. One system that

has gained increasing popularity in North

America is a 1.25 MHz Code Division

Multiple Access (CDMA) system (IS-95). In

CDMA systems, multiple access interference

limits the capacity of any system using

conventional single user correlation or matched

filter receivers. Previous research has shown

that multiuser detection receivers that employ

interference cancellation techniques can

significantly improve the capacity of a CDMA

system. This thesis studies two such structures:

the successive interference cancellation scheme

and the parallel interference cancellation

scheme. These multiuser receivers are

integrated into an IS-95 compatible receiver

model which is simulated in software. This

thesis develops simulation software that

simulates IS-95 with conventional and

multiuser receivers in multipath channels and

when near-far conditions exist. Simulation

results present the robustness of multiuser

receivers to near-far in a practical system. In

addition to multiuser implemenations,

quantization effects from finite bit analog to

digital converters (ADC) in CDMA systems

will also be simulated.

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