MIMO Performance & Condition Number Under Given SNR in LTE Testing

INTRODUCTION Long Term Evolution (LTE) products will soon appear on the market and more products will be released in the future. As introduction of 5G is expected to appear around 2020, engineers need to quickly complete and test these new products. However, the complexity of these devices does not simplify this task. There are considerable performance metrics such as SNR, SIR, capacity etc, and the various features that may be necessary to achieve the desired result.

Large-scale MIMO with beam steering: MIMO is used in many applications from LTE to Wi-Fi, but the number of antennas is quite limited. The use of microwave frequencies opens up the possibility of using dozens of antennas on a single device, which is realistic due to antenna size and wavelength spacing. This allows you to manipulate the beam to improve performance. High Density Network: Reducing the size of the cell allows for more efficient use of available spectra. It is necessary to ensure that small cells in the macro network and small cells arranged as femto cells can operate satisfactorily. Adding a large number of cells to the network has a big challenge and technology for that has been developed.

LTE improves MIMO transmission in advance. Therefore, the gain of extra diversity will be small. Like frequency selective scheduling, it is not always desirable anyway. In addition, the benefits of spatial reuse are only suspicious. It limits the only way to achieve hotspots and indoor environments (small cells, distributed propagation environments, extremely low user mobility), and extremely high peak data rates. Spatial multiplexing typically requires high SNR regions. It may be most beneficial to use beamforming in combination with spatial multiplexing within different beams. The downlink MIMO transmission requires 4 UE receive antennas and 4 × 4 MIMO is the baseline. Then, by using the 8 × 8MIMO (requires eight antenna reference signal), the downlink peak data rate is achieved for the uplink MIMO transmission, it requires 2UE transmit antennas, 2 × 2 MIMO Can be a baseline. Upstream peak data rate, coverage, capacity