US5859842A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antenna diversity techniques
Assignee: Intel Corp
•
Filing: 1995-11-08
•
Granted: 1999-01-12
•
Expires: 2015-11-08
Abstract
Abstract A receiver system for antenna diversity employing a single backhaul cable. A single backhaul cable couples a receiver to a plurality of antennas. The signals from the antennas are combined onto the single backhaul cable using frequency offsets, spread spectrum code division, time division, or a combination thereof. At the receiver, the signals from the antennas are decoupled. In the case of frequency offsets, the antenna signals are decoupled by splitting the backhaul signal into a plurality of duplicate signals, frequency shifting selected ones of the duplicate signals, and correlating said frequency shifted signals. In the case of spread spectrum code division, the antenna signals are decoupled by splitting the backhaul signal into a plurality of duplicate signals and demultiplexing each of the duplicate signals with a different spread spectrum code. One or more antennas may be selected for communication in response decoupling the antenna signals.
Inventors
- 👤 Logan Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:59
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/02; H04B7/04; H04B7/08; H04B7/0837; H04B7/12; H04W; H04W88/00; H04W88/08; H04W88/085
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
200 words
A wireless communication system comprising: a spread spectrum transmitter connected to a transmitting antenna, said spread spectrum transmitter outputting a spread spectrum signal for transmission, a plurality of spatially separated receiving antennas each capable of generating an antenna signal in response to receiving said spread spectrum signal, a first mixer coupled to a first antenna signal and a predefined frequency offset signal, and having as an output a frequency converted signal, said frequency converted signal having a center frequency offset from a center frequency of said first antenna signal by less than a frequency bandwidth of said received spread spectrum signal, a combiner connected to said frequency converted signal and a second antenna signal, and outputting a backhaul signal, a backhaul cable having one end connected to said backhaul signal, a signal splitter connected to an opposite end of said backhaul cable, said signal splitter having as outputs a plurality of duplicate backhaul signals, a second mixer coupled to a first duplicate backhaul signal and an inverse of said predefined frequency offset signal, and a plurality of receiving ports, a first receiving port connected to said second mixer, and a second receiving port connected to a second duplicate backhaul signal.
Claim 2
Dependent Claim
200 words
A wireless communication system comprising: a spread spectrum transmitter connected to a transmitting antenna, said spread spectrum transmitter outputting a spread spectrum signal for transmission, a plurality of spatially separated receiving antennas each capable of generating an antenna signal in response to receiving said spread spectrum signal, a first mixer coupled to a first antenna signal and a predefined frequency offset signal, and having as an output a frequency converted signal, said frequency converted signal having a center frequency offset from a center frequency of said first antenna signal by less than a frequency bandwidth of said received spread spectrum signal, a combiner connected to said frequency converted signal and a second antenna signal, and outputting a backhaul signal, a backhaul cable having one end connected to said backhaul signal, a signal splitter connected to an opposite end of said backhaul cable, said signal splitter having as outputs a plurality of duplicate backhaul signals, a second mixer coupled to a first duplicate backhaul signal and an inverse of said predefined frequency offset signal, and a plurality of receiving ports, a first receiving port connected to said second mixer, and a second receiving port connected to a second duplicate backhaul signal.
Claim 3
Dependent Claim
106 words
The communication system of claim 1 further comprising said second mixer coupled to a third antenna signal and a second predefined frequency offset signal, and having as an output a second frequency converted signal, said second frequency converted signal having a second center frequency offset from a center frequency of said third antenna signal by less than said received spread spectrum signal frequency bandwidth, an input of said combiner connected to said second frequency converted signal, a fourth mixer coupled to a third duplicate backhaul signal and an inverse of said second predefined frequency offset signal, and a third receiving port connected to said fourth mixer.
Claim 4
Dependent Claim
44 words
The communication system of claim 1 wherein said first mixer upconverts said first antenna signal by said predefined frequency offset in order to generate said frequency converted signal, and wherein said second mixer downconverts said first duplicate backhaul signal by said predefined frequency offset.
Claim 5
Dependent Claim
27 words
The communication system of claim 3 wherein said second mixer outputs a second mixer output signal having a center frequency at said first antenna signal center frequency.
Claim 6
Dependent Claim
19 words
The communication system of claim 4 wherein each of said receiving ports is connected to a spread spectrum correlator.
Claim 7
Dependent Claim
18 words
The communication system of claim 1 further comprising means for selecting one of said antenna signals for communication.
Claim 8
Dependent Claim
208 words
A communication system comprising: a spread spectrum transmitter connected to a transmitting antenna, said spread spectrum transmitter outputting a spread spectrum signal for transmission, a plurality of spatially separated receiving antennas each capable of generating an antenna signal in response to receiving said spread spectrum signal, a plurality of first mixers, each coupled to a single antenna signal, a plurality of frequency offset signals, each coupled to one of said first mixers, each of said frequency offset signals offset from the nearest other frequency offset signal by less than a predefined frequency amount less than the bandwidth of said spread spectrum signal, a combiner for combining an output from each of said first mixers into a backhaul signal, a backhaul cable having one end connected to said backhaul signal, a signal splitter connected to an opposite end of said backhaul cable, said signal splitter having as outputs a plurality of duplicate backhaul signals, a plurality of second mixers, each coupled to one of said duplicate backhaul signals, a plurality of inverse frequency offset signals, each an inverse of one of said frequency offset signals, and each one connected to an input of a second mixer, and a receiver coupled to an output from each of said second mixers.
Claim 9
Dependent Claim
208 words
A communication system comprising: a spread spectrum transmitter connected to a transmitting antenna, said spread spectrum transmitter outputting a spread spectrum signal for transmission, a plurality of spatially separated receiving antennas each capable of generating an antenna signal in response to receiving said spread spectrum signal, a plurality of first mixers, each coupled to a single antenna signal, a plurality of frequency offset signals, each coupled to one of said first mixers, each of said frequency offset signals offset from the nearest other frequency offset signal by less than a predefined frequency amount less than the bandwidth of said spread spectrum signal, a combiner for combining an output from each of said first mixers into a backhaul signal, a backhaul cable having one end connected to said backhaul signal, a signal splitter connected to an opposite end of said backhaul cable, said signal splitter having as outputs a plurality of duplicate backhaul signals, a plurality of second mixers, each coupled to one of said duplicate backhaul signals, a plurality of inverse frequency offset signals, each an inverse of one of said frequency offset signals, and each one connected to an input of a second mixer, and a receiver coupled to an output from each of said second mixers.
Claim 10
Dependent Claim
24 words
The communication system of claim 7 wherein said receiver comprises a plurality of spread spectrum correlators, one for each output of said second mixers.
Claim 11
Dependent Claim
17 words
The communication system of claim 8 wherein said receiver selects one of said antenna signals for communication.
Claim 12
Independent Claim
154 words
A method for receiving a plurality of antenna signals, comprising the steps of: receiving a spread spectrum signal using a plurality of antennas, each antenna capable of generating an antenna signal in response thereto, generating a plurality of first frequency offset signals by adding a different frequency offset to each antenna signal from a plurality of frequency offsets, each first frequency offset signal differing in center frequency from the nearest other first frequency offset signal by less than a bandwidth of said received spread spectrum signal, combining said frequency offset signals into a backhaul signal, sending said backhaul signal over a cable, splitting, at an opposite end of said cable, said backhaul signal into a plurality of duplicate backhaul signals, adding one of said frequency offsets to each of said duplicate backhaul signals, and generating a plurality of second frequency offset signals thereby, and spread spectrum correlating each of said second frequency offset signals.
Claim 13
Independent Claim
154 words
A method for receiving a plurality of antenna signals, comprising the steps of: receiving a spread spectrum signal using a plurality of antennas, each antenna capable of generating an antenna signal in response thereto, generating a plurality of first frequency offset signals by adding a different frequency offset to each antenna signal from a plurality of frequency offsets, each first frequency offset signal differing in center frequency from the nearest other first frequency offset signal by less than a bandwidth of said received spread spectrum signal, combining said frequency offset signals into a backhaul signal, sending said backhaul signal over a cable, splitting, at an opposite end of said cable, said backhaul signal into a plurality of duplicate backhaul signals, adding one of said frequency offsets to each of said duplicate backhaul signals, and generating a plurality of second frequency offset signals thereby, and spread spectrum correlating each of said second frequency offset signals.
Claim 14
Dependent Claim
18 words
The method of claim 10 further comprising the step of selecting one of said antenna signals for communication.
Claim 15
Dependent Claim
40 words
The method of claim 10 wherein said step of adding a different frequency offset to each antenna signal from a plurality of frequency offsets comprises the step of single sideband mixing each antenna signal with one of said frequency offsets.
Claim 16
Dependent Claim
34 words
The method of claim 10 wherein each frequency offset is, relative to the nearest other frequency offset, not less than an inverse of two times a coherent processing interval of said spread spectrum signal.
Claim 17
Independent Claim
109 words
A method for receiving a plurality of antenna signals, comprising the steps of: receiving a spread spectrum signal using a plurality of antennas, and generating a plurality of antenna signals thereby, frequency isolating said plurality of antenna signals using a set of frequency offsets, thereby generating a plurality of frequency isolated antenna signals, combining said frequency isolated antenna signals for transmission over a cable, splitting an output of said cable into a plurality of duplicate cable signals, applying to each duplicate signal one frequency offset from said set of frequency offsets, thereby generating a plurality of frequency offset cable signals, and spread spectrum correlating each frequency offset cable signals.
Claim 18
Independent Claim
109 words
A method for receiving a plurality of antenna signals, comprising the steps of: receiving a spread spectrum signal using a plurality of antennas, and generating a plurality of antenna signals thereby, frequency isolating said plurality of antenna signals using a set of frequency offsets, thereby generating a plurality of frequency isolated antenna signals, combining said frequency isolated antenna signals for transmission over a cable, splitting an output of said cable into a plurality of duplicate cable signals, applying to each duplicate signal one frequency offset from said set of frequency offsets, thereby generating a plurality of frequency offset cable signals, and spread spectrum correlating each frequency offset cable signals.
Claim 19
Dependent Claim
30 words
The method of claim 14 wherein each of said frequency offset cable signals comprises one of said antenna signals centered at an original center frequency of said one antenna signal.
Claim 20
Dependent Claim
37 words
The method of claim 15 wherein each of said frequency offset cable signals further comprises a version of each of said other antenna signals offset in frequency from said original center frequency of said one antenna signal.
Claim 21
Dependent Claim
18 words
The method of claim 14 further comprising the step of selecting one of said antenna signals for communication.
Claim 22
Dependent Claim
40 words
The method of claim 14 wherein said step of frequency isolating said plurality of antenna signals using a set of frequency offsets comprises the step of single sideband mixing each antenna signal with one frequency offset from said frequency offsets.
Claim 23
Dependent Claim
28 words
The method of claim 14 wherein said cable has a maximum information transmission bandwidth of less than a sum of a bandwidth of each of said antenna signals.
Claim 24
Dependent Claim
34 words
The method of claim 14 wherein each frequency offset is, relative to the nearest other frequency offset, not less than an inverse of two times a coherent processing interval of said spread spectrum signal.
Claim 25
Dependent Claim
26 words
The method of claim 14 wherein each frequency offset is, relative to the nearest other frequency offset, less than a bandwidth of said spread spectrum signal.
Claim 26
Dependent Claim
12 words
The method of claim 14 wherein said cable is a backhaul cable.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-01-11 | 2002-07-13 | 2003-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-01-11 | 2006-07-13 | 2007-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-01-11 | 2010-07-13 | 2011-01-12 | $7700.00 | Window Closed / Lapsed |