研究目的
To improve the performance of a single-user mmWave massive MIMO system using a hybrid beamforming technique with large antenna arrays and the Alamouti coding scheme, especially when perfect Channel State Information (CSI) is not available at the Base Station (BS).
研究成果
The Alamouti coding scheme significantly outperforms systems with hybrid beamforming only, ML, and MMSE detectors under imperfect CSI conditions, providing a gain exceeding 20 dB without exhibiting an error floor. This makes it a promising approach for extending the range of mmWave massive MIMO systems.
研究不足
The study is limited to a single-user scenario and does not explore multi-user environments. Additionally, the impact of elevation angles (3-D beamforming) is not considered, focusing only on azimuth angles (2-D channel model).
1：Experimental Design and Method Selection:
The study employs a hybrid beamforming technique with large antenna arrays and the Alamouti coding scheme to address the challenges of mmWave massive MIMO systems. The methodology includes computer simulations to evaluate the system's performance under imperfect CSI conditions.
2：Sample Selection and Data Sources:
The simulations consider a single-user mmWave massive MIMO system with specific configurations of antennas and RF chains at the BS and MS.
3：List of Experimental Equipment and Materials:
The study uses computer simulations, with parameters such as the number of antennas (64 at BS and 32 at MS), RF chains (2, 4, 10 at BS and 6 at MS), and a carrier frequency of 28 GHz.
4：Experimental Procedures and Operational Workflow:
The performance is evaluated in terms of bit error rate (BER) versus the received signal-to-noise ratio (SNR) for different system configurations and CSI conditions.
5：Data Analysis Methods:
The analysis compares the BER performance of the Alamouti code with hybrid beamforming only, ML detector, and MMSE detector under perfect and imperfect CSI conditions.
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