Communication equipment and antenna switching method

A technology for communication equipment and antenna switching, applied in communication between multiple stations, diversity/multi-antenna system, space transmit diversity, etc., can solve the problem of increased transmission line loss, unable to reduce disturbance wave level, and increased filter size And other issues

Active Publication Date: 2010-03-24
NEC PLATFORMS LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] However, the method disclosed in Patent Document 1 uses CINR (Carrier to Interference + Noise Ratio) or RSSI (Received Signal Strength Indication) alone for judging switching from one antenna to another, so that, for example, even when CINR deteriorates, the method also cannot correctly determine whether the deterioration is caused by an increase in the level of the disturbance wave
Therefore, this method entails the problem that the level of the disturbance wave cannot be reduced even when switching from one antenna to another
Thus, this method has the problem that the increase in the filter size results in an increase in transmission line loss

Method used

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  • Communication equipment and antenna switching method
  • Communication equipment and antenna switching method

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Embodiment Construction

[0036] Hereinafter, preferred exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

[0037] The following exemplary embodiments will be described in conjunction with a WiMAX communication device which is used as an example and which performs wireless communication using the 2.4GHz frequency band as a desired wave, and reduces the frequency from using the 2.5GHz frequency band (ISM frequency band). However, it should be understood that the present invention is not limited thereto. The present invention is applicable to communication devices generally for reducing the level of disturbance waves from other communication devices employing a frequency band adjacent to a desired frequency band.

[0038] Such as figure 1 As shown, the communication device of this exemplary embodiment includes n (n is a natural number equal to or greater than 2) antennas 10-1 to 10-n; antenna switching unit 11; WiMAX operating unit 12; and n an...

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Abstract

The present invention discloses communications equipment and an antenna switching method. The antenna switching method of the present invention include: a CINR monitoring step of monitoring signal CINR of a first band for each of a plurality of antennas periodically; a CINR comparation step of a most recent signal CINR of the first band with an average valve of a front special period for each of the plurality of antennas; a firs RSSI monitoring step of, for each of the plurality of antennas, monitoring signal RSSI of the first band periodically; a RSSI comparation step of a most recent signalRSSI of the first band with an average valve of a front special period for each of the plurality of antennas; and a selection step of selecting one of the plurality of antennas according to a judgement standard by means of the comparation results of the most recent values of the CINR signal and RSSI signal in the first band and the average values, and driving a switching unit to switch to the slected antenna.

Description

technical field [0001] The present invention relates to a communication device and an antenna switching method. Background technique [0002] The WiMAX (Worldwide Interoperability for Microwave Access) Forum has planned WiMAX based on the IEEE (Institute of Electrical and Electronics Engineers) 802.16e standard. [0003] WiMAX communication, although used for wireless communication, provides a communication speed as high as 20 Mbps or higher. [0004] Therefore, it is assumed here that WiMAX communication is used as a means of replacing fixed high-speed communication such as ADSL (Asymmetric Digital Subscriber Line), and several techniques have been proposed for WiMAX communication (see Patent Document 1, for example). [0005] However, WiMAX is assigned a 2.5GHz frequency band, which is adjacent to a frequency band of WLAN (Wireless Local Area Network) communication devices, Bluetooth communication devices, and an ISM (Industrial Scientific Medical) frequency band (2.4GHz)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/08H04B7/26
Inventor 石田隆康
Owner NEC PLATFORMS LTD
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