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Capacity of T-user collaborative coding multiple-access scheme operating over a noisy channel

Research output: Contribution to Journal/MagazineJournal articlepeer-review

<mark>Journal publication date</mark>1989
<mark>Journal</mark>Electronics Letters
Issue number11
Number of pages3
Pages (from-to)742-744
Publication StatusPublished
<mark>Original language</mark>English


The collaborative coding multiple-access (CCMA) technique potentially permits efficient simultaneous transmission by several users sharing a common channel, without subdivision in time or frequency. The capacity of a T-user binary adder multiple-access channel is calculated for additive white Gaussian noise (AWGN) conditions. The capacity in bits/ channel use for different numbers of users is derived by simulation for the baseband antipodal and bandpass on-off keying systems with coherent and noncoherent combining. It is shown that in principle T-user CCMA permits higher transmission rates than time-division multiple-access (TDMA) employing the same signal alphabet.