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

fYear

2003

fDate

15-17 Oct. 2003

Firstpage

297

Lastpage

298

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Wireless Communication Technology, 2003. IEEE Topical Conference on

Print_ISBN

0-7803-8196-3

Type

conf

DOI

10.1109/WCT.2003.1321530

Filename

1321530