WO1994026035B1 - Use of diversity transmission to relax adjacent channel requirements in mobile telephone systems - Google Patents
Use of diversity transmission to relax adjacent channel requirements in mobile telephone systemsInfo
- Publication number
- WO1994026035B1 WO1994026035B1 PCT/US1994/004840 US9404840W WO9426035B1 WO 1994026035 B1 WO1994026035 B1 WO 1994026035B1 US 9404840 W US9404840 W US 9404840W WO 9426035 B1 WO9426035 B1 WO 9426035B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- antenna
- transmission system
- carrier frequency
- diversity transmission
- signals
- Prior art date
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract 85
- 230000003111 delayed Effects 0.000 claims abstract 13
- 230000001808 coupling Effects 0.000 claims abstract 11
- 238000010168 coupling process Methods 0.000 claims abstract 11
- 238000005859 coupling reaction Methods 0.000 claims abstract 11
- 230000000051 modifying Effects 0.000 claims 72
- 239000000969 carrier Substances 0.000 claims 47
- 239000002131 composite material Substances 0.000 claims 4
- 230000011664 signaling Effects 0.000 claims 1
Abstract
The present invention includes a system and method for reducing adjacent channel interference, particularly in CDMA radiotelephone systems. Diversity transmissions are provided for weaker signals to be transmitted by coupling delayed or advanced versions of these weaker signals (2) to an antenna (6) which is also transmitting signals on an adjacent frequency (1).
Claims
1 . A diversity transmission system comprising: a first modulator for modulating a first set of information signals on to a first radio carrier frequency; a second modulator for modulating at least one of a second set of information signals on to a second radio carrier frequency; a first transmit power amplifier for said modulated signal at said first carrier frequency; a second transmit power amplifier for said modulated signal at said second carrier frequency; and a radio frequency combining network for combining the outputs of said first and second transmit power amplifiers and coupling the combined signal to a first antenna for transmission, wherein said at least one of said second set of information signals serves as a diversity transmission.
2. The diversity transmission system of claim 1 further comprising: a third modulator for modulating said second set of information signals on to said second radio carrier frequency; and a third transmit power amplifier for said third modulated signal at said second carrier frequency, the output of which is fed to a second antenna for transmission.
3. The diversity transmission system of claim 1 further comprising: a third modulator for modulating said second set of information signals on to said second radio carrier frequency; a fourth modulator for modulating at least one of said first set of information signals on to said first radio carrier frequency;
AMENDED SHEET (ARTICLE 19} a third transmit power amplifier for amplifying a signal generated by said third modulator; a fourth transmit power amplifying a signal generated by said fourth modulator; and a radio frequency combining network for combining outputs of said third and fourth transmit power amplifiers and coupling the combined signal to a second antenna for transmission.
4. A diversity transmission system according to claim 2, wherein said second antenna is spaced many wavelengths from said first antenna so as to obtain maximum spatial diversity gain.
5. A diversity transmission system according to claim 3, wherein said second antenna is spaced many wavelengths from said first antenna so as to obtain maximum spatial diversity gain.
6. A diversity transmission system according to claim 1 , wherein said radio-frequency combining networks are directional couplers.
7. A diversity transmission system according to claim 3, wherein said radio-frequency combining networks are directional couplers.
8. A diversity transmission system according to claim 1 , wherein said radio-frequency combining networks are multiplexing filters.
9. A diversity transmission system according to claim 3, wherein said radio-frequency combining networks are multiplexing filters.
AMENDED SHEET (ARl iCLE 13) 27
10. A diversity transmission system according to claim 2, wherein said at least one signal fed to said second modulator is delayed or advanced with respect to the same signal applied to said third modulator.
1 1 . A diversity transmission system according to claim 3, wherein said at least one signal fed to said second modulator is delayed or advanced with respect to the same signal applied to said third modulator; and said at least one signal fed to said fourth modulator is delayed or advanced with respect to the same signal applied to said first modulator.
12. A diversity transmission system according to claim 10, wherein said at least one signal is delayed or advanced by a whole number of bit or symbol periods.
13. A diversity transmission system according to claim 1 1 , wherein said at least one signals are delayed or advanced by a whole number of bit or symbol periods.
14. A diversity transmission system comprising: a first modulator for modulating a first set of information signals on to a first carrier frequency; a second modulator for modulating at least one of a second set of information signals on to a second carrier frequency; a first transmit power amplifier for said modulated signal at said first carrier frequency; a second transmit power amplifier for said modulated signal at said second carrier frequency; 28
an antenna multiplexing filter that combines an output of said first transmit power amplifier with at least one other signal having at least a third carrier frequency intended for transmission from the same antenna; and a radio frequency combining network for combining the outputs of said antenna multiplexing filter and said second transmit power amplifier and coupling the combined signal to a first antenna for transmission, wherein said at least one of said second set of information signals serves as a diversity transmission.
15. A diversity transmission system comprising: a first modulator for modulating a first set of information signals on to a first carrier frequency; a second modulator for modulating at least one of a second set of information signals on to a second radio carrier frequency; a first transmit power amplifier for said modulated signal at said first carrier frequency; a second transmit power amplifier for said modulated signal at said second carrier frequency; a first antenna multiplexing filter that combines an output of said first transmit power amplifier with at least one other signal having at a least a third carrier frequency intended for transmission from the first same; a second antenna multiplexing filter that combines an output of said second transmit power amplifier with at least one other signal having at least a fourth carrier frequency intended for transmission from the same antenna; and a radio frequency combining network for combining the outputs of said first and second antenna multiplexing filters and coupling the combined signal to a first antenna for transmission, wherein said at least one of said second set of information signals serves as a diversity transmission.
AMENDED SHEET (AR I ICLE 19) 29
16. A diversity transmission system according to claim 14, wherein said at least one other signal having at least a third carrier frequency are generated by a fifth modulator and fifth transmit power amplifier.
17. A diversity transmission system according to claim 15, in which said at least one other signal having at least a third carrier frequency are produced by a fifth modulator and fifth transmit power amplifier.
18. A diversity transmission system according to claim 17, in which said at least one other signal having at least a fourth carrier frequency are produced by a sixth modulator and sixth transmit power amplifier.
19. A diversity transmission system according to claim 15 further comprising: a third modulator for modulating a second set of information signals on to said second radio carrier frequency; a fourth modulator for modulating at least one of said first set of information signals on to said first radio carrier frequency; a third transmit power amplifier for said third modulated signal at said second carrier frequency; a fourth transmit power amplifier for said fourth modulated signal at said first carrier frequency; a third antenna multiplexing filter that combines an output of said third transmit power amplifier with at least one signal having at least a fourth carrier frequency intended for transmission from the same antenna; a fourth antenna multiplexing filter that combines an output of said fourth transmit power amplifier with at least one other signal having at least a third carrier frequency intended for transmission from the same antenna; and 30
a radio frequency combining network for combining the outputs of said third and fourth antenna multiplexing filters and coupling the combined signal to a second antenna for transmission.
20. A diversity transmission system comprising: a first modulator for modulating a first set of information signals on to a first radio carrier frequency; a second modulator for modulating at least one of a second set of information signals on to a second radio carrier frequency; and a radio frequency combining network for combining outputs of said first and second modulators and coupling the combined signal to a common power amplifier and antenna for transmission, wherein said at least one of said second set of information signals serves as a diversity transmission.
21. The diversity transmission system as in claim 20 further comprising: a third modulator for modulating said second set of information signals on to said second radio carrier frequency; a third transmit power amplifier for said third modulated signal at said second carrier frequency, the output of which is fed to a second antenna for transmission.
22. The diversity transmission system as in claim 20 further comprising: a third modulator for modulating said second set of information signals on to said second radio carrier frequency; a fourth modulator for modulating at least one of said first set of information signals on to said first radio carrier frequency; 31
a second radio frequency combining network for combining outputs of said third and fourth modulators and coupling the combined signal to a second common power amplifier and antenna for transmission.
23. A diversity transmission system comprising: a first modulator for modulating a first set of information signals on to a first radio carrier frequency; a second modulator for modulating at least one of a second set of information signals on to a second radio carrier frequency; and a radio frequency combining network for combining outputs of said first and second modulators with other signals having different carrier frequencies and coupling said combined signal to a common power amplifier and antenna for transmission, wherein said at least one of said second set of information signals serves as a diversity transmission.
24. The diversity transmission system according to claim 20 in which said common transmit power amplifier is a linear or linearized power amplifier designed to minimize intermodulation between said signals.
25. The diversity transmission system according to claim 5 in which said at least one of said second set of signals is transmitted at a power level lower than the transmission of said first set of signals.
26. A radio transmission system for multiple signals comprising: first transmit means for modulating a first set of information signals onto even-numbered radio channels and amplifying said first set of information signals to produce a first set of transmit signals; 32
second transmit means for modulating a second set of information signals onto odd-numbered radio channels and amplifying said second set of information signals to produce a second set of transmit signals; third transmit means for modulating selected ones of said first set of information signals onto respectively assigned even-numbered radio channels and amplifying said selected signals to produce a diversity transmit signal; first transmit multiplexer means for multiplexing said first set of transmit signals to form a first composite signal and feeding said first composite signal to a first antenna means; second transmit multiplexer means for multiplexing said second set of transmit signals to form a second composite signal, and coupling means for coupling said second composite signal and said diversity transmit signal to a second antenna means.
27. A transmission system as in claim 26 in which said first antenna means and said second antenna means comprise orthogonal polarization inputs of a dual-polarization antenna.
28. The transmission system of claim 2, wherein said first and second antennas comprise orthogonal polarizations of a dual-polarization antenna.
29. The transmission system of claim 3, wherein said first and second antennas comprise orthogonal polarizations of a dual -polarization antenna.
30. The transmission system of claim 19, wherein said first and second antennas comprise orthogonal polarizations of a dual-polarization antenna.
31. The transmission system of claim 21, wherein said first and second antennas comprise orthogonal polarizations of a dual-polarization antenna. 33
32. The diversity transmission system of claim 1 , wherein said at least one of said second set of information signals serving as a diversity transmission is delayed or advanced with respect to a same signal transmitted on said second carrier frequency via a second antenna.
33. The diversity transmission system of claim 1, wherein said at least one of said second set of information signals serving as a diversity transmission is transmitted at a power level lower than a same signal transmitted on said second carrier frequency via a second antenna.
34. The diversity transmission system of claim 14, wherein said at least one of said second set of information signals serving as a diversity transmission is delayed or advanced with respect to a same signal transmitted on said second carrier frequency via a second antenna.
35. The diversity transmission system of claim 14, wherein said at least one of said second set of information signals serving as a diversity transmission is transmitted at a power level lower than a same signal transmitted on said second carrier frequency via a second antenna.
36. The diversity transmission system of claim 15, wherein said at least one of said second set of information signals serving as a diversity transmission is delayed or advanced with respect to a same signal transmitted on said second carrier frequency via a second antenna.
37. The diversity transmission system of claim 15, wherein said at least one of said second set of information signals serving as a diversity transmission is transmitted at a power level lower than a same signal transmitted on said second carrier frequency via a second antenna. 34
38. The diversity transmission system of claim 20, wherein said at least one of said second set of information signals serving as a diversity transmission is delayed or advanced with respect to a same signal transmitted on said second carrier frequency via a second antenna.
39. The diversity transmission system of claim 20, wherein said at least one of said second set of information signals serving as a diversity transmission is transmitted at a power level lower than a same signal transmitted on said second carrier frequency via a second antenna.
40. The diversity transmission system of claim 23, wherein said at least one of said second set of information signals serving as a diversity transmission is delayed or advanced with respect to a same signal transmitted on said second carrier frequency via a second antenna.
41. The diversity transmission system of claim 23, wherein said at least one of said second set of information signals serving as a diversity transmission is transmitted at a power level lower than a same signal transmitted on said second carrier frequency via a second antenna.
42. The diversity transmission system of claim 26, wherein the selected signals are delayed or advanced with respect the first set of information signals.
43. The diversity transmission system of claim 26, wherein the selected signals are transmitted at a power level lower than the first set of information signals.
44. The diversity transmission system of claim 26, wherein the even-numbered radio channels comprise frequencies which are adjacent in 35
frequency to and alternate in frequency with frequencies of the odd-numbered radio channels.
45. A diversity transmission system comprising: first modulating means for modulating a first set of information signals onto a first set of frequency channels to produce a first set of transmit signals for transmission from a first antenna; second modulating means for modulating a second set of information signals onto a second set of frequency channels to produce a second set of transmit signals; third modulating means for modulating selected ones of the first set of information signals onto the first set of frequency channels to produce diversity signals; a combiner for combining the second set of transmit signals with the diversity signals for transmission from a second antenna; wherein the first set of frequency channels is adjacent in frequency to and alternates in frequency with the second set of frequency channels.
46. The diversity transmission system of claim 45, wherein the diversity signals are delayed or advanced with respect the first set of transmit signals.
47. The diversity transmission system of claim 45, wherein the diversity signals are transmitted at a power level lower than the first set of transmit signals.
48. A method for diversity transmission of signals in a radiotelephone system comprising the steps of: 36
modulating a first set of information signals onto a first set of frequency channels to produce a first set of transmit signals for transmission from a first antenna; modulating a second set of information signals onto a second set of frequency channels to produce a second set of transmit signals; modulating selected ones of the first set of information signals onto the first set of frequency channels to produce diversity signals; combining the second set of transmit signals with the diversity signals for transmission from a second antenna; wherein the first set of frequency channels comprises frequency bands which are adjacent in frequency to and alternate in frequency with frequency bands of the second set of frequency channels.
49. The method of claim 48, further comprising the step of delaying or advancing the diversity signals with respect the first set of transmit signals.
50. The method of claim 48, further comprising the step of transmitting the diversity signals at a power level lower than the power level of the first set of transmit signals.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BR9405296-4A BR9405296A (en) | 1993-04-29 | 1994-04-29 | Diversity transmission system. |
| AU67802/94A AU675714B2 (en) | 1993-04-29 | 1994-04-29 | Use of diversity transmission to relax adjacent channel requirements in mobile telephone systems |
| CA002139234A CA2139234C (en) | 1993-04-29 | 1994-04-29 | Use of diversity transmission to relax adjacent channel requirements in mobile telephone systems |
| JP6524621A JPH07508635A (en) | 1993-04-29 | 1994-04-29 | Using Diversity Transmission to Relax Adjacent Channel Requirements within Mobile Telephone Systems |
| KR1019940704816A KR100331406B1 (en) | 1993-04-29 | 1994-04-29 | Use of diversity transmission to relax adjacent channel requirements in mobile telephone systems |
| FI946139A FI946139A (en) | 1993-04-29 | 1994-12-28 | Use of diversity transmission to reduce interference requirements for nearby channels in mobile communication systems |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US5387193A | 1993-04-29 | 1993-04-29 | |
| US08/053,871 | 1993-04-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO1994026035A1 WO1994026035A1 (en) | 1994-11-10 |
| WO1994026035B1 true WO1994026035B1 (en) | 1994-12-22 |
Family
ID=21987114
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US1994/004840 WO1994026035A1 (en) | 1993-04-29 | 1994-04-29 | Use of diversity transmission to relax adjacent channel requirements in mobile telephone systems |
Country Status (14)
| Country | Link |
|---|---|
| US (1) | US5584057A (en) |
| EP (1) | EP0622910B1 (en) |
| JP (1) | JPH07508635A (en) |
| KR (1) | KR100331406B1 (en) |
| CN (1) | CN1037141C (en) |
| AU (1) | AU675714B2 (en) |
| BR (1) | BR9405296A (en) |
| CA (1) | CA2139234C (en) |
| DE (1) | DE69432844T2 (en) |
| FI (1) | FI946139A (en) |
| NZ (1) | NZ266341A (en) |
| SG (1) | SG66285A1 (en) |
| TW (1) | TW314672B (en) |
| WO (1) | WO1994026035A1 (en) |
Families Citing this family (36)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5614914A (en) | 1994-09-06 | 1997-03-25 | Interdigital Technology Corporation | Wireless telephone distribution system with time and space diversity transmission for determining receiver location |
| US5940445A (en) * | 1996-05-31 | 1999-08-17 | Motorola, Inc. | Method and apparatus for providing transmit diversity in a wireless communication system |
| US6243565B1 (en) * | 1996-06-18 | 2001-06-05 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and apparatus for transmitting communication signals using frequency and polarization diversity |
| US6061568A (en) * | 1996-10-01 | 2000-05-09 | Ericsson Inc. | Method and apparatus for mitigating intermodulation effects in multiple-signal transmission systems |
| FI105511B (en) | 1996-10-29 | 2000-08-31 | Nokia Networks Oy | Procedure for combining multiple signals and base station |
| US6128276A (en) | 1997-02-24 | 2000-10-03 | Radix Wireless, Inc. | Stacked-carrier discrete multiple tone communication technology and combinations with code nulling, interference cancellation, retrodirective communication and adaptive antenna arrays |
| JP3290926B2 (en) * | 1997-07-04 | 2002-06-10 | 松下電器産業株式会社 | Transmit diversity device |
| US6061336A (en) * | 1997-09-30 | 2000-05-09 | Qualcomm Incorporated | Polarization enhanced CDMA communication system |
| US6181920B1 (en) * | 1997-10-20 | 2001-01-30 | Ericsson Inc. | Transmitter that selectively polarizes a radio wave |
| US6125109A (en) * | 1998-02-24 | 2000-09-26 | Repeater Technologies | Delay combiner system for CDMA repeaters and low noise amplifiers |
| CN1295739A (en) * | 1998-03-31 | 2001-05-16 | 夸尔柯姆股份有限公司 | Signal combining method in base station of CDMA system |
| US6889034B1 (en) * | 1998-04-02 | 2005-05-03 | Ericsson Inc. | Antenna coupling systems and methods for transmitters |
| KR20010106445A (en) * | 1998-08-18 | 2001-11-29 | 추후제출 | Stacked-carrier discrete multiple tone communication technology |
| CN100590985C (en) * | 1998-08-18 | 2010-02-17 | 比阿恩凤凰公司 | Multilayer carrier discrete multitone communication technology |
| CN102983893B (en) * | 1998-08-18 | 2015-10-28 | 直视集团公司 | Multilayer-carrier discrete multi-tone communication system and method |
| EP1073214B1 (en) * | 1999-02-16 | 2008-12-17 | Mitsubishi Denki Kabushiki Kaisha | Radio communication system, transmitter and receiver |
| US6421327B1 (en) * | 1999-06-28 | 2002-07-16 | Qualcomm Incorporated | Method and apparatus for controlling transmission energy in a communication system employing orthogonal transmit diversity |
| JP3590759B2 (en) * | 2000-07-03 | 2004-11-17 | 株式会社巴川製紙所 | Toner for electrostatic image development and two-component developer |
| JP3550085B2 (en) * | 2000-11-01 | 2004-08-04 | 松下電器産業株式会社 | Wireless transmission device and wireless transmission method |
| CN1211967C (en) * | 2001-07-20 | 2005-07-20 | 连宇通信有限公司 | Method for producing interference of adjacent channels in CDMA communication system |
| US7035599B2 (en) * | 2001-07-30 | 2006-04-25 | Lucent Technologies Inc. | Biased phase sweep transmit diversity |
| US6980778B2 (en) * | 2001-07-30 | 2005-12-27 | Lucent Technologies Inc. | Split shift phase sweep transmit diversity |
| US7042955B2 (en) * | 2001-07-30 | 2006-05-09 | Lucent Technologies Inc. | Space time spreading and phase sweep transmit diversity |
| US7020482B2 (en) * | 2002-01-23 | 2006-03-28 | Qualcomm Incorporated | Reallocation of excess power for full channel-state information (CSI) multiple-input, multiple-output (MIMO) systems |
| US7149483B1 (en) * | 2003-10-28 | 2006-12-12 | Magnolia Broadband Inc. | Amplifying diversity signals using power amplifiers |
| US7660598B2 (en) * | 2004-12-21 | 2010-02-09 | Qualcomm, Incorporated | Transmit power reduction for a wireless device with multiple transmit signal paths |
| US20060237384A1 (en) * | 2005-04-20 | 2006-10-26 | Eric Neumann | Track unit with removable partitions |
| US8493941B2 (en) * | 2006-04-21 | 2013-07-23 | Alcatel Lucent | Method to control the effects of out-of-cell interference in a wireless cellular system using over-the-air feedback control |
| US8515377B2 (en) * | 2007-03-12 | 2013-08-20 | Telefonaktiebolaget L M Ericsson (Publ) | Imbalanced transmission combining at radio base station |
| US8768397B2 (en) * | 2009-10-02 | 2014-07-01 | Sharp Kabushiki Kaisha | Transmission power control on a wireless communication device for a plurality of regulated bands or component carriers |
| US9059749B2 (en) * | 2009-10-02 | 2015-06-16 | Sharp Kabushiki Kaisha | Antenna port mode and transmission mode transitions |
| US8660208B2 (en) * | 2009-10-20 | 2014-02-25 | Qualcomm Incorporated | Apparatus and methods for QAM modulation using dual polar modulation |
| CN103563251B (en) * | 2011-05-30 | 2017-04-05 | 日本电气株式会社 | VSWR measuring circuits, radio communication device and VSWR measuring methods |
| US8830886B2 (en) * | 2011-11-04 | 2014-09-09 | Broadcom Corporation | Wireless communication device capable of controlling signal polarization based on channel conditions |
| KR102420198B1 (en) * | 2017-04-03 | 2022-07-13 | 삼성전자주식회사 | Electronic device and method for controlling transmit power in device-to-device communication |
| US20220240102A1 (en) * | 2021-01-25 | 2022-07-28 | Samsung Electronics Co., Ltd. | Method and electronic device for switching antenna |
Family Cites Families (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3662268A (en) * | 1970-11-17 | 1972-05-09 | Bell Telephone Labor Inc | Diversity communication system using distinct spectral arrangements for each branch |
| US3693088A (en) * | 1970-12-29 | 1972-09-19 | Bell Telephone Labor Inc | Diversity system for mobile radio using fade rate switching |
| IL38104A (en) * | 1971-02-24 | 1974-01-14 | Hughes Aircraft Co | Adaptive power redistribution systems |
| US3748600A (en) * | 1972-04-28 | 1973-07-24 | Bell Telephone Labor Inc | Power combining network |
| US4081748A (en) * | 1976-07-01 | 1978-03-28 | Northern Illinois Gas Company | Frequency/space diversity data transmission system |
| US4298984A (en) * | 1976-10-06 | 1981-11-03 | Her Majesty The Queen In Right Of Canada, As Represented By The Minister Of National Defence | Method and apparatus for improving error rate on radio teletype circuits |
| FR2474791A1 (en) * | 1980-01-29 | 1981-07-31 | Thomson Csf | DIVERSITY RADIO-TRANSMISSION SYSTEM OF SIMPLE AND ECONOMIC STRUCTURE, AND TELECOMMUNICATION NETWORK COMPRISING SUCH SYSTEMS |
| US4383332A (en) * | 1980-11-21 | 1983-05-10 | Bell Telephone Laboratories, Incorporated | High capacity digital mobile radio system |
| US4513412A (en) * | 1983-04-25 | 1985-04-23 | At&T Bell Laboratories | Time division adaptive retransmission technique for portable radio telephones |
| US4635006A (en) * | 1984-12-18 | 1987-01-06 | Rca Corporation | Adjustable waveguide branch directional coupler |
| US4710944A (en) * | 1986-10-17 | 1987-12-01 | Rca Corporation | Dual transmit-receive space diversity communication system |
| US4841527A (en) * | 1987-11-16 | 1989-06-20 | General Electric Company | Stabilization of random access packet CDMA networks |
| JPH0744492B2 (en) * | 1988-06-15 | 1995-05-15 | 松下電工株式会社 | Polarization diversity wireless communication system |
| US4912722A (en) * | 1988-09-20 | 1990-03-27 | At&T Bell Laboratories | Self-synchronous spread spectrum transmitter/receiver |
| US5163181A (en) * | 1988-10-21 | 1992-11-10 | Harris Corporation | Multiple rf signal amplification method and apparatus |
| US5274836A (en) * | 1989-08-08 | 1993-12-28 | Gde Systems, Inc. | Multiple encoded carrier data link |
| GB2237706A (en) * | 1989-11-03 | 1991-05-08 | Racal Res Ltd | Radio communications link with diversity |
| IL100213A (en) * | 1990-12-07 | 1995-03-30 | Qualcomm Inc | CDMA microcellular telephone system and distributed antenna system therefor |
| US5228055A (en) * | 1991-01-31 | 1993-07-13 | Clarion Co., Ltd. | Spread spectrum communication device |
| JPH05102899A (en) * | 1991-08-16 | 1993-04-23 | Shiyoudenriyoku Kosoku Tsushin Kenkyusho:Kk | Multi-frequency communication system |
| US5305353A (en) * | 1992-05-29 | 1994-04-19 | At&T Bell Laboratories | Method and apparatus for providing time diversity |
| US5289499A (en) * | 1992-12-29 | 1994-02-22 | At&T Bell Laboratories | Diversity for direct-sequence spread spectrum systems |
-
1994
- 1994-04-28 DE DE69432844T patent/DE69432844T2/en not_active Expired - Lifetime
- 1994-04-28 EP EP94850072A patent/EP0622910B1/en not_active Expired - Lifetime
- 1994-04-28 SG SG1996007769A patent/SG66285A1/en unknown
- 1994-04-29 AU AU67802/94A patent/AU675714B2/en not_active Ceased
- 1994-04-29 NZ NZ266341A patent/NZ266341A/en unknown
- 1994-04-29 BR BR9405296-4A patent/BR9405296A/en not_active Application Discontinuation
- 1994-04-29 KR KR1019940704816A patent/KR100331406B1/en not_active IP Right Cessation
- 1994-04-29 WO PCT/US1994/004840 patent/WO1994026035A1/en active Application Filing
- 1994-04-29 CA CA002139234A patent/CA2139234C/en not_active Expired - Lifetime
- 1994-04-29 CN CN94190252A patent/CN1037141C/en not_active Expired - Lifetime
- 1994-04-29 JP JP6524621A patent/JPH07508635A/en active Pending
- 1994-05-02 TW TW083103953A patent/TW314672B/zh not_active IP Right Cessation
- 1994-12-28 FI FI946139A patent/FI946139A/en unknown
-
1995
- 1995-06-30 US US08/497,022 patent/US5584057A/en not_active Expired - Lifetime
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO1994026035B1 (en) | Use of diversity transmission to relax adjacent channel requirements in mobile telephone systems | |
| US9979443B2 (en) | Distributed antenna system for MIMO signals | |
| KR100352852B1 (en) | A transmitting device of receiving signal for optical bts | |
| KR101336531B1 (en) | Method and apparatus for reducing combiner loss in a multi-sector, omni-base station | |
| US5187803A (en) | Regenerative rf bi-directional amplifier system | |
| US5809398A (en) | Channel selective repeater | |
| US5584057A (en) | Use of diversity transmission to relax adjacent channel requirements in mobile telephone systems | |
| US8064958B2 (en) | Method device base station and site for reducing the number of feeders in an antenna diversity diversity system | |
| CA2199922C (en) | Communication system for multicasting delay-adjusted signals on same radio frequencies to adjoining cells | |
| US20010031623A1 (en) | Channel booster amplifier | |
| JPH09502061A (en) | Base station device using diversity reception | |
| CN111447050A (en) | Signal enhancement system and duplex communication implementation method of signal enhancement system | |
| WO1997045967A1 (en) | Method and apparatus for providing transmit diversity in a wireless communication system | |
| US7019710B1 (en) | Antenna system | |
| EP0910179A3 (en) | Method and apparatus for spacecraft amplication of multichannel signals | |
| AU727274B2 (en) | Method of combining several signals, and base station | |
| EP0894372B1 (en) | Channel-selective repeater for mobile telephony | |
| US6765929B1 (en) | Method and apparatus for combining signals | |
| CN211378024U (en) | Signal enhancement system | |
| EP0755129A2 (en) | Cellular base station amplifiers for amplifying received RF signals | |
| CN110808751A (en) | Wireless communication receiving system | |
| KR20000042956A (en) | Optical repeater system for 2-way wavelength division multiplexing | |
| KR200297971Y1 (en) | Base station active array antenna | |
| JP2003078463A (en) | Booster and method for controlling booster gain | |
| WO2002003641A1 (en) | Cofdm transmitter with diversity and time delay |