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Questions tagged [noma]

Non-Orthogonal Multiple Access: Instead of modelling the ideal case for multiple users using the channels in perfectly separable (i.e. orthogonal) ways, the system design exploits the fact that non-perfect information recovery can still lead to a higher sum rate.

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Is -40dbm power for AWGN considered too high and unrealistic?

I am reading a research paper on NOMA BER performance. For the simulation the author chooses oddly high awgn power -40dbm ( considering noise spectral density -174+10logB this would result in ...
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Modeling channel for Multiple users using Rayleigh

I am trying to reproduce the results of a given paper using their approach and model. I have a difficult time understanding a statement in the paper and have doubts about how to interpret it. The ...
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Trying to understand how to get NOMA data rates

I am trying to understand the following example: I understand all of them except the R2 for NOMA. What is the value of h2? and what is the value of N2? Also do we use the freq BW anywhere in these ...
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1 answer
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How can $N_0$ be zero in this example of calculating throughput in non-orthogonal multiple access?

I am very new to the area and I have a question. I came across this example, I'd appreciate it if anyone could clarify this for me. In the paper it says: For example, we assume a multiple access ...
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1 answer
53 views

Interference Distribution Assumption in NOMA IoT Scenario

I am assuming a NOMA IoT Uplink scenario, which is interference marred. I have to ascertain the SINR at the Access Point (AP) for the NOMA users. A sub-channel is allocated to various users and ...
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60 views

Correct Noise for NOMA system

I am trying to simulate a NOMA system with SIC, but I'm so confusing with the noise expression: $n_m \sim CN(0, \sigma^2_m)$, is zero mean complex additive Gaussian noise with variance at mth user ...
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129 views

How can I perform semi-blind non-orthogonal successive interference cancellation (SIC) / source-separation with SISO in 4G/5G Downlink?

Semi-blind non-orthogonal successive interference cancellation in the single antenna case with 4G/5G signals (applies generally though). This is very similar to NOMA in 5G, except that I have no ...
1 vote
1 answer
105 views

How calculate channel gains in NOMA?

I am developing a user group algorithm in NOMA, but I need channel gain for that. I know that the channel gain consists of some components, but I have not found a way to calculate the gain. Does ...
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56 views

Why is NOMA needed in 5G?

Although there is wide band spectrum in 5G from 6GHz to 300 GHz, why is NOMA needed in 5G to enhance spectrum efficiency. We can communicate in different frequencies since we have very large band. Are ...
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132 views

To implement successive interference cancellation (SIC) process, should the receiver know the power allocated to each symbol?

My question is as follows: To implement successive interference cancellation (SIC) process in downlink non-orthogonal multiple access (NOMA), should receivers know all power allocated to each symbol? ...