JPS55156433A - Space diversity system - Google Patents
Space diversity systemInfo
- Publication number
- JPS55156433A JPS55156433A JP6396679A JP6396679A JPS55156433A JP S55156433 A JPS55156433 A JP S55156433A JP 6396679 A JP6396679 A JP 6396679A JP 6396679 A JP6396679 A JP 6396679A JP S55156433 A JPS55156433 A JP S55156433A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- intermediate frequency
- signals
- synthesizing circuit
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0891—Space-time diversity
- H04B7/0894—Space-time diversity using different delays between antennas
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radio Transmission System (AREA)
Abstract
PURPOSE:To simplify circuit constitution and to remove faults appearing when received signals are mixed in one with attention paid to only phases, by using a variable delay line, using element differing in delay time according to a frequency, instead of an infinite phase shifter. CONSTITUTION:Frequency converters 24 and 25 convert received signals S21 and S22 into intermediate frequency signals S24 and S25 of frequency fi with local oscillation signal S23 supplied from local oscillator 26. Signal S24, on the other hand, is input to synthesizing circuit 28 via intermediate frequency amplifier 27, and the other signal S25 to synthesizing circuit 28 via intermediate frequency amplifier 30 being delayed by continuous variable delay circuit 29 whose delay time is controlled. Amplifiers 27 and 30 have gains controlled by gain control signal S26 from synthesizing circuit 28 and both signals S24 and S25 are led out of amplifiers 27 and 30 as amplification output signals S24' and S25', which are mixed in one by synthesizing circuit 28, which obtain composite intermediate frequency signal S27.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6396679A JPS55156433A (en) | 1979-05-25 | 1979-05-25 | Space diversity system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6396679A JPS55156433A (en) | 1979-05-25 | 1979-05-25 | Space diversity system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS55156433A true JPS55156433A (en) | 1980-12-05 |
Family
ID=13244538
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6396679A Pending JPS55156433A (en) | 1979-05-25 | 1979-05-25 | Space diversity system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55156433A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0224627U (en) * | 1988-07-30 | 1990-02-19 | ||
| EP0863620A2 (en) * | 1997-03-04 | 1998-09-09 | Nec Corporation | Diversity circuit |
| US9660625B1 (en) | 2016-05-03 | 2017-05-23 | International Business Machines Corporation | Continuously tunable delay line |
-
1979
- 1979-05-25 JP JP6396679A patent/JPS55156433A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0224627U (en) * | 1988-07-30 | 1990-02-19 | ||
| EP0863620A2 (en) * | 1997-03-04 | 1998-09-09 | Nec Corporation | Diversity circuit |
| EP0863620A3 (en) * | 1997-03-04 | 1998-12-30 | Nec Corporation | Diversity circuit |
| US6229840B1 (en) | 1997-03-04 | 2001-05-08 | Nec Corporation | Diversity circuit |
| US9660625B1 (en) | 2016-05-03 | 2017-05-23 | International Business Machines Corporation | Continuously tunable delay line |
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