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On Optimizing Transmit Power, Channel-Quantization Rate, and User Pairing for Power-Domain MIMO-NOMA Downlinks

Telecommunications / News / On Optimizing Transmit Power, Channel-Quantization Rate, and User Pairing for Power-Domain MIMO-NOMA Downlinks
23. May 2024
Guest lecture by
Prof. Santipach
Kasetsart University, Bangkok

Prof. Santipach from Kasetsart University, Bangkok, is currently visiting the Institute of Telecommunications and he will give the talk.

Date, Time:
May 23, 2024, 15:00 to 16:00

Event location:
EI 5 Hochenegg HS

Organiser:
Institute of Telecommunications
Norbert Görtz
E-Mail: norbert.goertz@tuwien.ac.at

Title: “On Optimizing Transmit Power, Channel-Quantization Rate, and User Pairing for Power-Domain MIMO-NOMA Downlinks”

Speaker: Prof. Wiroonsak Santipach

Abstract:
We consider power-domain multiple-input multiple-output (MIMO) nonorthogonal multiple access (NOMA) downlinks in which a multiple-antenna base station applies zeroforcing beamforming to transmit data to single-antenna users. Two users whose channel correlation coefficient exceeds a threshold are paired to share the same transmit beam. We derive an approximate of the expected signal-to-interference plus noise ratio (SINR) for each user, which depends on transmit power, the correlation threshold, and the number of quantization bits for channel direction information (CDI). A max-min SINR problem is formulated as a geometric program. We show that a near-optimal SINR can be achieved by optimizing only two CDI rates: one for unpaired users and the other for user pairs. A large SINR gain can be achieved by optimizing a pairing threshold when a total CDI rate is high.

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