US5347535A
Expired / Lapsed
US
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CDMA communication system
Assignee: KDDI Corp
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Filing: 1993-03-03
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Granted: 1994-09-13
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Expires: 2013-03-03
Abstract
Abstract A CDMA communication system using a spreading code has a plurality of mobile stations and at least one base station. The mobile stations and the base station are provided with respective receiving sections, each of which has a path diversity function for reducing multipath fading. The base station includes an array antenna having a plurality of integrated antenna elements spaced by a distance substantially equal to one to several wavelengths from each other so as to produce a space diversity effect. A plurality of delay devices are coupled with the respective antenna elements, for applying time delays to signals which pass through the respective antenna elements. The time delay are different from each other by a one symbol period of the spreading code or more.
Inventors
- 👤 Yoshio Karasawa
- 👤 Hisato Iwai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:22
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/02; H04B7/04; H04B7/08; H04B7/0891; H04B7/0894
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
125 words
A CDMA communication system using spreading codes, said system having a plurality of mobile stations and at least one base station, said mobile stations and said base station provided with respective receiving sections each of which has a path diversity function for reducing multipath fading, said base station comprising: an array antenna having a plurality of integrated antenna elements spaced by a distance substantially equal to one to several wavelengths from each other so as to produce a space diversity effect; and a plurality of delay means coupled with said respective antenna elements, for applying time delays to signals which pass through said respective antenna elements, said time delay being different from each other by a one symbol period of the spreading codes or more.
Claim 2
Dependent Claim
125 words
A CDMA communication system using spreading codes, said system having a plurality of mobile stations and at least one base station, said mobile stations and said base station provided with respective receiving sections each of which has a path diversity function for reducing multipath fading, said base station comprising: an array antenna having a plurality of integrated antenna elements spaced by a distance substantially equal to one to several wavelengths from each other so as to produce a space diversity effect; and a plurality of delay means coupled with said respective antenna elements, for applying time delays to signals which pass through said respective antenna elements, said time delay being different from each other by a one symbol period of the spreading codes or more.
Claim 3
Dependent Claim
54 words
A system as claimed in claim 1, wherein said delay means are formed by optical fiber cables coupled with said respective antenna elements, each length of the optical fiber cables being adjusted so that the difference of the delay between the cables corresponds to a one symbol period of the spreading code or more.
Claim 4
Dependent Claim
50 words
A system as claimed in claim 1, wherein said receiving section includes a correlator for calculating a correlation between signals received at said receiving section and a spreading code assigned to a particular mobile station, and a tapped delay line connected to said correlator, for realizing the path diversity function.
Claim 5
Dependent Claim
68 words
A system as claimed in claim 2, wherein said array antenna is a receiver antenna for receiving signals from said mobile stations, wherein said base station includes electro-optical converters inserted between said respective antenna elements and one ends of said respective optical fiber cables, an optical combining means coupled with the other ends of said optical fiber cables, and an opto-electrical converter coupled with said optical combining means.
Claim 6
Dependent Claim
57 words
A system as claimed in claim 4, wherein said base station further includes a correlator for calculating a correlation between signals fed from said opto-electrical converter and a spreading code used for modulating signals to be transmitted at a particular mobile station, and a tapped delay line connected to said correlator, for realizing the path diversity function.
Claim 7
Dependent Claim
68 words
A system as claimed in claim 2, wherein said array antenna is a transmitter antenna for transmitting signals to said mobile stations, wherein said base station includes opto-electrical converters inserted between said respective antenna elements and one ends of said respective optical fiber cables, an optical distributing means coupled with the other ends of said optical fiber cables, and a electro-optical converter coupled with said optical distributing means.
Claim 8
Dependent Claim
129 words
A system as claimed in claim 2, wherein said array antenna is an antenna for receiving and transmitting signals from and to said mobile stations, wherein said base station includes first electro-optical converters inserted between said respective antenna elements and one ends of respective first set of said optical fiber cables, an optical combining means coupled with the other ends of said first set of said optical fiber cables, a first opto-electrical converter coupled with said optical combining means, second opto-electrical converters inserted between said respective antenna elements and one ends of respective second set of said optical fiber cables, an optical distributing means coupled with the other ends of said second set of said optical fiber cables, and a second electro-optical converter coupled with said optical distributing means.
Claim 9
Dependent Claim
58 words
A system as claimed in claim 7, wherein said base station further includes a correlator for calculating a correlation between signals fed from said first opto-electrical converter and a spreading code used for modulating signals to be transmitted at a particular mobile station, and a tapped delay line connected to said correlator, for realizing the path diversity function.
Claim 10
Dependent Claim
114 words
A base station for a CDMA communication system using spreading codes, said system having a plurality of mobile stations, said base station provided with a receiving section which has a path diversity function for reducing multipath fading, comprising: an array antenna having a plurality of integrated antenna elements spaced by a distance substantially equal to one to several wavelengths from each other so as to produce a space diversity effect; and a plurality of delay means coupled with said respective antenna elements, for applying time delays to signals which pass through said respective antenna elements, said time delay being different from each other by a one symbol period of the spreading codes or more.
Claim 11
Dependent Claim
114 words
A base station for a CDMA communication system using spreading codes, said system having a plurality of mobile stations, said base station provided with a receiving section which has a path diversity function for reducing multipath fading, comprising: an array antenna having a plurality of integrated antenna elements spaced by a distance substantially equal to one to several wavelengths from each other so as to produce a space diversity effect; and a plurality of delay means coupled with said respective antenna elements, for applying time delays to signals which pass through said respective antenna elements, said time delay being different from each other by a one symbol period of the spreading codes or more.
Claim 12
Dependent Claim
55 words
A base station as claimed in claim 9, wherein said delay means are formed by optical fiber cables coupled with said respective antenna elements, each length of the optical fiber cables being adjusted so that the difference of the delay between the cables corresponds to a one symbol period of the spreading code or more.
Claim 13
Dependent Claim
51 words
A base station as claimed in claim 9, wherein said receiving section includes a correlator for calculating a correlation between signals received at said receiving section and a spreading code assigned to a particular mobile station, and a tapped delay line connected to said correlator, for realizing the path diversity function.
Claim 14
Dependent Claim
69 words
A base station as claimed in claim 10, wherein said array antenna is a receiver antenna for receiving signals from said mobile stations, wherein said base station includes electro-optical converters inserted between said respective antenna elements and one ends of said respective optical fiber cables, an optical combining means coupled with the other ends of said optical fiber cables, and an opto-electrical converter coupled with said optical combining means.
Claim 15
Dependent Claim
58 words
A base station as claimed in claim 12, wherein said base station further includes a correlator for calculating a correlation between signals fed from said opto-electrical converter and a spreading code used for modulating signals to be transmitted at a particular mobile station, and a tapped delay line connected to said correlator, for realizing the path diversity function.
Claim 16
Dependent Claim
69 words
A base station as claimed in claim 10, wherein said array antenna is a transmitter antenna for transmitting signals to said mobile stations, wherein said base station includes opto-electrical converters inserted between said respective antenna elements and one ends of said respective optical fiber cables, an optical distributing means coupled with the other ends of said optical fiber cables, and a electro-optical converter coupled with said optical distributing means.
Claim 17
Dependent Claim
130 words
A base station as claimed in claim 10, wherein said array antenna is an antenna for receiving and transmitting signals from and to said mobile stations, wherein said base station includes first electro-optical converters inserted between said respective antenna elements and one ends of respective first set of said optical fiber cables, an optical combining means coupled with the other ends of said first set of said optical fiber cables, a first opto-electrical converter coupled with said optical combining means, second opto-electrical converters inserted between said respective antenna elements and one ends of respective second set of said optical fiber cables, an optical distributing means coupled with the other ends of said second set of said optical fiber cables, and a second electro-optical converter coupled with said optical distributing means.
Claim 18
Dependent Claim
59 words
A base station as claimed in claim 15, wherein said base station further includes a correlator for calculating a correlation between signals fed from said first opto-electrical converter and a spreading code used for modulating signals to be transmitted at a particular mobile station, and a tapped delay line connected to said correlator, for realizing the path diversity function.
Claim 19
Dependent Claim
124 words
An antenna section in a base station of a CDMA communication system using spreading codes, said system having a plurality of mobile stations, said mobile stations and said base station provided with respective receiving sections each of which has a path diversity function for reducing multipath fading, comprising: an array antenna having a plurality of integrated antenna elements spaced by a distance substantially equal to one to several wavelengths from each other so as to produce a space diversity effect; and a plurality of delay means coupled with said respective antenna elements, for applying time delays to signals which pass through said respective antenna elements, said time delay being different from each other by a one symbol period of the spreading codes or more.
Claim 20
Dependent Claim
124 words
An antenna section in a base station of a CDMA communication system using spreading codes, said system having a plurality of mobile stations, said mobile stations and said base station provided with respective receiving sections each of which has a path diversity function for reducing multipath fading, comprising: an array antenna having a plurality of integrated antenna elements spaced by a distance substantially equal to one to several wavelengths from each other so as to produce a space diversity effect; and a plurality of delay means coupled with said respective antenna elements, for applying time delays to signals which pass through said respective antenna elements, said time delay being different from each other by a one symbol period of the spreading codes or more.
Claim 21
Dependent Claim
55 words
An antenna section as claimed in claim 17, wherein said delay means are formed by optical fiber cables coupled with said respective antenna elements, each length of the optical fiber cables being adjusted so that the difference of the delay between the cables corresponds to a one symbol period of the spreading code or more.
References Cited (Backward Citations)
US3633107A
Cited
US4349914A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-09-12 | 1998-03-14 | 1998-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-09-12 | 2002-03-14 | 2002-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-09-12 | 2006-03-14 | 2006-09-13 | $7700.00 | Window Closed / Lapsed |