Rate Loss Analysis for Multiple-Antenna NOMA with Limited Feedback
🤖 AI Summary
This work addresses the performance degradation in multi-antenna downlink NOMA systems under limited feedback, where quantization errors in both channel gain and direction lead to rate loss and shrinkage of the NOMA feasibility region. For the first time in MISO-NOMA systems, this study jointly models the quantization of channel gain and direction and derives a tight information-theoretic upper bound on the resulting rate loss. Theoretical analysis reveals that this bound decays exponentially with the number of feedback bits. Simulation results validate the tightness of the derived bound and demonstrate that the achievable sum rate under limited feedback can asymptotically approach that under perfect channel state information, thereby quantifying the minimum feedback overhead required to realize high-performance NOMA.
Application Category
📝 Abstract
In the limited feedback downlink multiple-input single-output (MISO) non-orthogonal multiple access (NOMA) system, both the effective channel gain and the channel direction need to be quantized. The quantization error affects the feasible region of NOMA and the rate loss compared with the full channel state information (CSI) case. In this letter, we analyze this effect and obtain upper bound for the rate loss. The numerical results show that the sum rate of the limited feedback MISO-NOMA system approaches that of the full CSI as the number of feedback bits increases.
Problem
Research questions and friction points this paper is trying to address.
rate loss
limited feedback
MISO-NOMA
channel quantization
non-orthogonal multiple access
Innovation
Methods, ideas, or system contributions that make the work stand out.
limited feedback
MISO-NOMA
rate loss
channel quantization
non-orthogonal multiple access
🔎 Similar Papers
No similar papers found.
