Throughput Performance of a Direct Sequence CDMA Packet Radio Network

Abstract

A Code Division Multiple Access (CDMA) spread spectrum packet radio network model is presented. The topology is a single-hop fully connected network with identical users. The network model allows the performance of the radio links to be specified in detail. A model of a BPSK Direct Sequence (DS) CDMA radio channel with convolutional Forward Error Correction (FEC) coding is used. A refinement of the network model takes into account the restriction that half- duplex radios cannot transmit and receive simultaneously. Single hop throughput and probability of successful first transmission are derived. The effects on throughput and probability of successful first transmission are derived. The effects on throughput of the received signal strength Eb/No, the number of chips per bit N and the number of users M are shown. A channel load sense access protocol is introduced in which radios are blocked from transmitting when the channel is heavily loaded. The increase in throughput due to this protocol is shown for zero and for non-zero propagation delay. (rh)

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1985
Accession Number
ADA221804

Entities

People

  • Fouad A. Tobagi
  • James S. Storey

Organizations

  • Stanford University

Tags

Communities of Interest

  • Energy and Power Technologies
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Channel Models
  • Code Division Multiple Access
  • Communication Systems
  • Computer Programming
  • Computer Programs
  • Computers
  • Decoding
  • Electrical Engineering
  • Markov Chains
  • Multiple Access
  • Probability
  • Radio Equipment
  • Radio Links
  • Random Variables
  • Spread Spectrum
  • Three Dimensional
  • Throughput

Fields of Study

  • Computer science

Readers

  • Computer Networking
  • Radio communications and signal processing.