IEICE Transactions on Communications
Online ISSN : 1745-1345
Print ISSN : 0916-8516
Special Section on Recent Progress in Antennas, Propagation and Wireless Systems Related to Topics in ISAP2014
Four-Stream Parallel Transmission for Short-Range MIMO Using Only Passive Analog Components
Kentaro MURATANaoki HONMAKentaro NISHIMORIDavid M. KLYMYSHYNHisashi MORISHITA
Author information
JOURNAL RESTRICTED ACCESS

2016 Volume E99.B Issue 1 Pages 69-80

Details
Abstract

An analog-beamforming-based eigenmode transmission technique is proposed that employs a network of interconnected 180-degree hybrid couplers at both transmitting and receiving sides of a plane-symmetrically configured short-range MIMO system. This technique can orthogonalize MIMO channels regardless of array parameters such as antenna spacing and Tx-Rx distance, provided the MIMO array is symmetric. For verifying the effectiveness of the proposed technique in channel orthogonalization, an experiment is conducted using a 4×4 MIMO array consisting of microstrip antennas and cascade-connected rat-race hybrid couplers. The results indicate a reduction in interference by approximately -28.3dB on average compared to desired signal power, and the ability to realize four-stream parallel MIMO transmission by using only analog passive networks. The proposed technique can achieve channel capacity almost equivalent to that of eigenbeam space division multiplexing with ideal digital beamforming.

References (35)
Content from these authors
Cited by (3)
© 2016 The Institute of Electronics, Information and Communication Engineers
Previous article Next article
feedback
Top