Throughput of Unslotted Direct-Sequence Spread-Spectrum Multiple-Access Channels with Block FEC Coding

Kuriacose Joseph, D. Raychaudhuri

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


An analysis of unslotted random-access direct-sequence spread-spectrum multiple-access (DS/SSMA) channels with block forward error correction (FEC) coding is presented. Extending a methodology that was introduced in an earlier paper on unslotted packet CDMA without coding, a procedure for calculating the error probability of an L bit packet in the variable message length, FECCoded, DS/SSMA environment is described. This procedure is then used in conjunction with appropriate flow equilibrium traffic models to compute channel throughput. Using BCH block coding as an example, the analytical model is exercised to obtain throughput (5) versus channel traffic (G) curves over a range of code rates, leading to an assessment of maximum achievable throughput and the associated optimum FEC code rate. The results show that the use of block FEC coding provides a significant improvement in the bandwidth-normalized channel throughput (utilization), approaching values which are competitive with those for comparable narrowband ALOHA channels.

Original languageEnglish (US)
Pages (from-to)1373-1378
Number of pages6
JournalIEEE Transactions on Communications
Issue number9
StatePublished - Sep 1993
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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