Title :
Incorporation of RF-adaptive array antenna into MIMO receivers
Author :
Nakaya, Yuuta ; Toda, Takeshi ; Hara, Shinsuke ; Takada, Jun-ichi ; Oishi, Yasuyuki
Author_Institution :
Mobile Phones Group, Fujitsu Ltd, Yokosuka, Japan
Abstract :
We propose the incorporation of an RF-adaptive array antenna (RF-AAA) into each receive branch on multiple-input multiple output (MIMO) systems. The RF-AAA consists of multiple antenna elements where a variable-gained low-noise amplifier (VG-LNA) and a 360°- continuously adjustable phase shifter are inserted in each antenna element and an adder for the array output is connected into the RF front-end of each receive branch. The phase shifters are adaptively controlled to increase the total channel capacity of MIMO systems. Computer simulations showed that the capacity of a 2-element-receive-RF-AAA incorporated 2 × 2 MIMO system is higher than that of a conventional 3 × 3 MIMO system (without RF-AAA) under average transmit power constraints.
Keywords :
MIMO systems; adaptive antenna arrays; adaptive control; adders; channel capacity; radiofrequency amplifiers; receiving antennas; MIMO receivers; RF front-end; RF-AAA; RF-adaptive array antenna; VG-LNA; adaptive control; adder; channel capacity; continuously adjustable phase shifter; multiple antenna elements; multiple-input multiple output systems; receive branch; variable-gained low-noise amplifier; Antenna arrays; Channel capacity; Computer simulation; Control systems; Low-noise amplifiers; MIMO; Phase shifters; Phased arrays; Radio frequency; Receiving antennas;
Conference_Titel :
Wireless Communication Technology, 2003. IEEE Topical Conference on
Print_ISBN :
0-7803-8196-3
DOI :
10.1109/WCT.2003.1321530
