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

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2 Author(s)
Honary, B. ; Dept. of Eng., Warwick Univ., Coventry, UK ; Ali, F.

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.

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Electronics Letters  (Volume:25 ,  Issue: 11 )