Radio base station apparatus and radio communication method
First Claim
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1. A radio base station apparatus comprising:
- a fading correlation monitor that detects a fading correlation of radio waves received through a plurality of antenna elements;
a reception method selector that receives the radio waves from the antenna elements and provides the radio waves to a receiver selected in accordance with the detected fading correlation;
a directional receiver that executes directional reception, on the provided radio waves, only when the reception method selector selects the directional receiver to receive the provided radio waves;
a diversity receiver that executes diversity reception, on the provided radio waves, only when the reception method selector selects the diversity receiver to receive the provided radio waves; and
a demodulator that demodulates a signal output by the receiver selected to receive the radio waves provided by the reception method selector, wherein;
the directional receiver creates directivity for the radio waves to increase the quality of the demodulated signal, andthe diversity receiver combines or selects a plurality of signal sequences within the radio waves to increase the quality of the demodulated signal.
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Abstract
The fading correlation monitor 103 detects an angle spread of the communication terminal apparatus 200-1 and decides whether the angle spread has a larger or smaller relationship with a preset threshold value. When the estimated angle spread is smaller than the threshold value, the interference wave is suppressed by carrying out directive reception which is carried out by an AAA receiver 106 as well as performing directive transmission which is carried out in a transmitting circuit 122.While, when the estimated angle spread is larger than the predetermined value, the distortion of the signals due to the fading is compensated by carrying out diversity receiving which is carried out in a diversity receiver 107 as well as performing diversity transmission which is carried out in a diversity transmitter 123.On account of this, even when the fading correlation is small, it is possible to carry out a radio communication with a satisfactory communication quality.
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Citations
9 Claims
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1. A radio base station apparatus comprising:
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a fading correlation monitor that detects a fading correlation of radio waves received through a plurality of antenna elements; a reception method selector that receives the radio waves from the antenna elements and provides the radio waves to a receiver selected in accordance with the detected fading correlation; a directional receiver that executes directional reception, on the provided radio waves, only when the reception method selector selects the directional receiver to receive the provided radio waves; a diversity receiver that executes diversity reception, on the provided radio waves, only when the reception method selector selects the diversity receiver to receive the provided radio waves; and a demodulator that demodulates a signal output by the receiver selected to receive the radio waves provided by the reception method selector, wherein; the directional receiver creates directivity for the radio waves to increase the quality of the demodulated signal, and the diversity receiver combines or selects a plurality of signal sequences within the radio waves to increase the quality of the demodulated signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A radio communication method comprising:
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detecting a fading correlation of radio waves received through a plurality of antenna elements; providing the received radio waves to a receiver selected in accordance with the detected fading correlation; executing directional reception, on the provided radio waves, with a directional receiver only when the directional receiver is selected to receive the provided radio waves; executing diversity reception, on the provided radio waves, with a diversity receiver only when the diversity receiver is selected to receive the provided radio waves; and demodulating a signal output by the receiver selected to receive the provided radio waves, wherein; executing directional reception creates directivity for the provided radio waves to increase the quality of the demodulated signal, and executing diversity reception combines or selects a plurality of signal sequences within the provided radio waves to increase the quality of the demodulated signal. - View Dependent Claims (9)
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Specification
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Current AssigneeOptis Wireless Technology, LLC (Brevet Capital)
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Original AssigneeMatsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
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InventorsMiyoshi, Kenichi, Uesugi, Mitsuru
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Primary Examiner(s)Anderson, Matthew D.
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Assistant Examiner(s)TRAN, TUAN A
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Application NumberUS10/069,396Publication NumberTime in Patent Office1,960 DaysField of Search455/561, 455/562.1, 455/25, 455/101, 455/63.4, 455/67.1, 455/67.13, 455/67.16, 455/504, 455/65, 455132-139, 455/277.2, 455/278.1, 455/279.1, 455/16, 455/67.11, 342/357.1, 342/357.13, 342/13, 375/200, 375208-210, 375/267, 375/347, 370252-253, 370465-467US Class Current455/562.1CPC Class CodesH04B 17/309 Measuring or estimating cha...H04B 7/0615 of weighted versions of sam...H04B 7/0617 for beam formingH04B 7/0619 using feedback from receivi...H04B 7/0689 using different transmissio...H04B 7/0857 using maximum ratio combini...H04B 7/086 using weights depending on ...H04B 7/0871 using different reception s...H04W 16/24 Cell structuresH04W 88/08 Access point devices
