Abstract
This paper presents a novel passive repeater that achieves enhanced Multiple-Input-Multiple-Output (MIMO) communication between two isolated terminals. The novel aspect of this work is an avoidance of the key-hole effect, which is normally caused by a repeater since all of the signal goes through the same point. Moreover, our idea uses electrical control, which is simply realized by only varactor diodes on the antennas, and this idea provides fast and low-cost control of the MIMO channel. This configuration allows the passive repeater to control the MIMO channel. MIMO channel capacity is maximized by controlling all repeater elements individually. The effectiveness of the passive repeater in enhancing MIMO channel capacity is verified by experiments. First of all, we obtained propagation data from field experiment, and propagation characteristics were evaluated using equations. The results show that the 10% value of MIMO channel capacity can be improved by 2.92 bits/s/Hz in an indoor propagation environment, which well confirms the effectiveness of the proposed method.
Highlights
Multiple-Input-Multiple-Output (MIMO) systems, which use multiple antennas at both the transmitter and receiver sides, offers high data-transmission rates even if the frequency band is limited [1]
The results show that the 10% value of MIMO channel capacity can be improved by 2.92 bits/s/Hz in an indoor propagation environment, which well confirms the effectiveness of the proposed method
This paper proposes a tunable passive repeater consisting of microstrip antennas and varactor diodes; its performance is evaluated experimentally
Summary
Multiple-Input-Multiple-Output (MIMO) systems, which use multiple antennas at both the transmitter and receiver sides, offers high data-transmission rates even if the frequency band is limited [1]. When the number of propagation paths is limited, MIMO channel capacity is decreased by the keyhole effect [3,4] To overcome this problem, cooperative diversity using relay nodes was proposed. The passive repeater can control path direction to improve channel capacity without noise-amplification, signal-processing, or power-consumption. By changing the load-reactance values of the dipole elements, the transmit array offers highly effective propagation channel control This technique cannot be applied to situations where the source and destination stations are mutually hidden by walls. It can deliver the signals to any terminal location in the adjoining room Another feature is that this passive repeater has very low power consumption since it has neither transmitters nor receivers.
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