Multistage Decision Feedback and Trellis-Based Multiuser Receivers for Convoluntionally Coded CDMA Systems

Abstract

In this report, multistage decision feedback and trellis-based multiuser receivers are studied for convolutionally coded CDMA links. Some of the receiver structures proposed combine the functions of equalization and decoding while some consider the operations separately. A variety of decision feedback approaches are proposed, and through simulations, it is shown that these approaches are able to significantly outperform the conventional basestation architecture. Two trellis-based approaches are also proposed. The first is a partitioned structure which attacks the MUI equalization and decoding operations separately. The second approach is the maximum likelihood sequence estimator for this problem which is a combined equalizer and decoder. This decoder is formulated and its complexity is seen to depend exponentially on the number of users in the system, the number of states in the individual users' encoders and the number of input information bits per interval.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1993
Accession Number
ADA344049

Entities

People

  • S. G. Wilson
  • T. R. Giallorenzi

Organizations

  • University of Virginia

Tags

Communities of Interest

  • Energy and Power Technologies
  • Human Systems

DTIC Thesaurus Topics

  • Algorithms
  • Business Administration
  • Code Division Multiple Access
  • Coding
  • Computations
  • Decoding
  • Electrical Engineering
  • Engineering
  • Estimators
  • Feedback
  • Matched Filters
  • Materials Science
  • Probability
  • Random Variables
  • Simulations
  • Statistics
  • Time Intervals

Fields of Study

  • Engineering

Readers

  • Applied Combinatorial Optimization and Logic Circuit Design.
  • Computer Engineering
  • Computer Science/Computer Engineering/Data Science/Digital Signal Processing.