Lte antennas for 17EC81

1. Introduction

2. Array gain

5. Antenna techniques

6. Diversity Processing

7. Receive Diversity

9. Receive diversity is most often used in the uplink.
 In LTE, the mobile’s test specifications assume that
the mobile is using two receive antennas, so LTE
systems are expected to use receive diversity on the
downlink as well as the uplink
❖ A mobile’s antennas are closer together than a BS’s,
which reduces the benefit of receive diversity

10. Transmit Diversity
Two ways to solve the problem
❖ Closed loop transmit diversity
❖ Open loop transmit diversity

11. 1.Closed Loop Transmit Diversity

12. 2.Open Loop Transmit Diversity

13. Open Loop Transmit Diversity

15. Spatial Multiplexing

16. 2*2 Spatial Multiplexing System

17. 2*2 Spatial Multiplexing System

18. Open Loop Spatial Multiplexing

20. Closed Loop Spatial Multiplexing

21. Beamforming Technique

23. DOA(Direction of Arrival)

24. Beam Steering

25. Performance comparison between
Combining/Beam Forming & Diversity
Techniques