Theoretical and Experimental Analysis of the Keyhole Effect for a Multi-antenna System in a Street Corner Environment at 2.4 GHz.

A study of a Multiple-Input Multiple-Output (MIMO) system in a street corner is presented in order to analyze the keyhole effect. First, MIMO channel matrices are calculated in this environment by using a ray launching model to theoretically analyze the problem. In this sense, results show that, in a Non-Line-of-Sight (NLoS) situation, capacity is close to the keyhole limit, since only diffracted rays are received. Moreover, measurements carried out in a similar environment are also presented, and results are compared with the theoretical results. The keyhole effect was difficult to measure in the real environment, since many other contributions were received. However, in the NLoS positions, and by analyzing only the diffracted contribution, a nearly keyhole capacity is found. [ABSTRACT FROM AUTHOR]