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A Scheduling Scheme for Improving the Performance and Security of MU-MIMO Systems
Henry Carvajal1, Nathaly Orozco1, Stalin Cacuango1
1Faculty of Engineering and Applied Sciences (FICA), Telecommunications Engineering, Universidad de Las Américas (UDLA), Quito 170124, Ecuador.
Sensors (Basel, Switzerland)
|July 27, 2022
Summary
This study introduces a novel scheduling scheme for multiuser MIMO systems using zero-forcing detectors. The scheme enhances system diversity and reduces error rates, even with imperfect channel estimation and eavesdropping attempts.
Area of Science:
- Wireless Communication
- Signal Processing
- Information Theory
Background:
- Linear detectors in MIMO systems offer low complexity but sacrifice diversity.
- Mitigating inter-user interference while preserving diversity is crucial for MU-MIMO performance.
Purpose of the Study:
- To propose a scheduling scheme for uplink MU-MIMO systems employing ZF detectors.
- To maintain system diversity and mitigate interference under Rician fading and imperfect channel estimation.
Main Methods:
- Developed an exact SNR expression for user selection.
- Proposed a scheduling strategy to maximize SNR by selecting U users from Ut.
- Analyzed performance considering Rician fading, AWGN, and imperfect channel estimation.
Main Results:
- Increased Ut leads to decreased outage probability (OP) and bit error rate (BER), indicating enhanced diversity.
- The scheme effectively counteracts imperfect channel estimation effects as Ut grows.
- The proposal reduces secrecy-outage-probability (SOP) in the presence of eavesdroppers.
Conclusions:
- The proposed scheduling scheme successfully balances diversity and interference mitigation in MU-MIMO systems.
- The strategy demonstrates robustness against channel estimation errors and enhances system security.
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