研究目的
Investigating the non-stationary characteristics of massive MIMO channels at 2 GHz and 6 GHz in an indoor hall scenario.
研究成果
The study found that the RMSDSs and coherence bandwidths over the large-scale antenna array were clearly different in different conditions. The median values of RMSAS ranged from 22.99° to 32.26° under different cases. The non-stationarity models of these angular parameters were established, which are useful for deep understanding of massive MIMO channels in the future.
研究不足
The study is limited to indoor hall scenarios and does not cover outdoor environments. The differences between channel characteristics at different frequencies in massive MIMO channels are not fully addressed.
1：Experimental Design and Method Selection:
The study involved real-world measurements of massive MIMO channels at 2 GHz and 6 GHz in an indoor hall scenario. The space-alternating generalized expectation-maximization (SAGE) algorithm was used to extract angular parameters.
2：Sample Selection and Data Sources:
Measurements were conducted in both line-of-sight (LOS) and non-LOS (NLOS) conditions.
3：List of Experimental Equipment and Materials:
A 64-element virtual linear antenna array generated by a high-accuracy automatic turntable was used at the transmitter (Tx) side, and a 4-element linear antenna array was used at the receiver (Rx) side.
4：Experimental Procedures and Operational Workflow:
The wideband channel transfer function (CTF) was measured using a multi-carrier signal in the frequency domain.
5：Data Analysis Methods:
The power delay profile (PDP), average PDP (APDP), root mean square delay spreads (RMSDSs), frequency correlation function (FCF), and coherence bandwidth were analyzed.
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