ADMA - A New Multiple Access System

The autocorrelation division multiple access system (ADMA) is a new multiple access system that is for MIMO wireless communication under "strong" co-channel interferences, such as the case in the unlicensed spectrum. The key element of ADMA system is the ADMA filter. In theory, the ADMA filter when perfectly computed can eliminate all co-channel interferences and multiple access interferences regardless of their strength. The ADMA system is a multiple access system that is developed for the computation of the ADMA filter to the 100% accuracy even under strong interferences. Simulation shows that under strong interferences (SIR = 30 dB), the ADMA filter can be obtained with a precision better than 99%. It further shows that with this filter, the strength of interferences is significantly reduced; the SINR at the output of the filter is constant at 15.2 dB over a range of values of SIR from 10 dB to 30 dB. Finally, it shows that with this ADMA filter, the ADMA system can achieve an uncoded bit-error rate at less than 10~ when SIR is at 30 dB.