Degree Type

Thesis

Date of Award

1-1-2003

Degree Name

Master of Science

Department

Electrical and Computer Engineering

Major

Electrical Engineering

Abstract

A direct-sequence spread-spectrum (DSSS) receiver is vulnerable to being desensitized by high-power narrowband signals within its wide received bandwidth. A solution to this problem is to detect the interfering signals and remove them from the received bandwidth in a process called narrowband interference excision. This can be achieved through a number of existing techniques. However, a hybrid system that utilizes both DSSS and frequency-hopping spread-spectrum (FHSS) techniques complicates the solution. This thesis investigates one technique for narrowband interference excision in the context of such a hybrid frequency-hopping/direct-sequence spread-spectrum (FH/DSSS) system. This technique is based on the discrete Fourier transform (DFT). An overview of DFT-based excision employing an overlap-and-add architecture is given. The critical properties of the window function used are examined, including windowing loss, excision lass, and interference rejection. Finally, the application of DFT-based excision in a hybrid FH/DSSS system is explored.

DOI

https://doi.org/10.31274/rtd-20200803-146

Copyright Owner

Carlos Jaime Chávez

Language

en

OCLC Number

52487672

File Format

application/pdf

File Size

46 pages

Share

COinS