What is the difference between NOMA system using the same channel and NOMA system using different channel for transmitting signal from the base station to the receiver.
Hi S Prabha Kumaresan
Non-orthogonal multiple access technique can control the throughput of every user by changing the power allocation coefficient ( for two user case, a1 portion of total power allocated to user 1 and a2 to user 2 with a1+a2=1 ) . Therefore, the sum throughput and user fairness are highly related to the power allocation coefficient. In case of asymmetric channel, the signal-to-interference-plus-noise ratios (SINRs) of the two users are different and the data rate of users using NOMA signaling are much higher than that of OMA signaling. The boundary of achievable rate with NOMA is outside the OMA capacity region. That is why NOMA is much effective in terms of sum throughput when the channels are different.
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