US5530926A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for operating a switched diversity RF receiver
Assignee: Motorola Solutions Inc
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Filing: 1995-02-13
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Granted: 1996-06-25
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Expires: 2015-02-13
Abstract
Abstract One of two antennas (11, 12) is selected (34) by comparing the quality of a first signal (32) preceding a desired signal, received through a first antenna (11), with the quality of a second signal (33) preceding the desired signal, received through the second antenna (12), if the accuracy (62) of a previous desired signal was bad. If the accuracy of the previous desired signal was good (62), but the quality failed to meet a threshold (52), then an antenna (11, 12) is selected (65) by comparing the quality (63) of the first signal preceding said desired signal received through the first antenna (11) with the quality (64) of the first signal preceding the desired signal received through the second antenna (12). If the accuracy of the previous desired signal was good (62) and the quality met the threshold (52), then the first antenna (11) is selected (53).
Inventors
- 👤 Walter J. Rozanski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:33
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/02; H04B7/04; H04B7/08; H04B7/0802; H04B7/0805; H04B7/0808; H04L; H04L1/00; H04L1/02; H04L1/06
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
152 words
A method of operating a switched diversity receiver having a first antenna, a second antenna and a diversity selection process for selecting one of said first and second antennas, said method comprising the steps of: receiving a desired signal in a first slot of a first frame of a communication channel using said first antenna; measuring a quality of said desired signal received at said first antenna; selecting said first antenna, prior to using said diversity selection process, to receive said desired signal in said first slot of said second frame if said quality of said desired signal meets a quality threshold; and selecting one of said first and second antennas based on said diversity selection process to receive said desired signal in a first slot of a second frame if said quality of said desired signal received at said first antenna in said first frame failed to meet said quality threshold.
Claim 2
Independent Claim
152 words
A method of operating a switched diversity receiver having a first antenna, a second antenna and a diversity selection process for selecting one of said first and second antennas, said method comprising the steps of: receiving a desired signal in a first slot of a first frame of a communication channel using said first antenna; measuring a quality of said desired signal received at said first antenna; selecting said first antenna, prior to using said diversity selection process, to receive said desired signal in said first slot of said second frame if said quality of said desired signal meets a quality threshold; and selecting one of said first and second antennas based on said diversity selection process to receive said desired signal in a first slot of a second frame if said quality of said desired signal received at said first antenna in said first frame failed to meet said quality threshold.
Claim 3
Dependent Claim
18 words
The method of claim 1 wherein said switched diversity receiver is a time division multiple access (TDMA) receiver.
Claim 4
Dependent Claim
18 words
The method of claim 1 wherein said switched diversity receiver is a code division multiple access (CDMA) receiver.
Claim 5
Dependent Claim
36 words
The method of claim 1 wherein said quality of said desired signal is one of a carrier-to-interference ratio, carrier-to-interference and nose ratio, received signal strength indicator, frame erasure rate, bit error rate, and frame error rate.
Claim 6
Dependent Claim
81 words
The method of claim 1 wherein said step of selecting one of said first and second antennas based on said diversity selection process comprises the steps of: measuring a quality of a first signal, preceding said desired signal, received by said first antenna; measuring said quality of a second signal, preceding said desired signal, received by said second antenna; and selecting one of said first and second antennas based upon a comparison of said quality of said first and second signals.
Claim 7
Independent Claim
197 words
A method of operating a switched diversity receiver having a first antenna and a second antenna, said method comprising the steps of: receiving a previous signal in a first slot of a first frame of a communication channel, said previous signal being received through said first antenna; measuring an accuracy of said previous signal; measuring a quality of said previous signal; selecting one of said first and second antennas by comparing said quality of a first signal preceding a desired signal, received through said first antenna, with said quality of a second signal preceding said desired signal, received through said second antenna, if said accuracy of said previous signal was insufficient; selecting said first antenna if said accuracy of said previous signal was sufficient and said quality of said previous signal meets a threshold; and selecting one of said first and second antennas by comparing said quality of said first signal preceding said desired signal received through said first antenna with said quality of said first signal preceding said desired signal received through said second antenna if said accuracy of said previous signal was sufficient and said quality of said previous signal failed to meet said threshold.
Claim 8
Independent Claim
197 words
A method of operating a switched diversity receiver having a first antenna and a second antenna, said method comprising the steps of: receiving a previous signal in a first slot of a first frame of a communication channel, said previous signal being received through said first antenna; measuring an accuracy of said previous signal; measuring a quality of said previous signal; selecting one of said first and second antennas by comparing said quality of a first signal preceding a desired signal, received through said first antenna, with said quality of a second signal preceding said desired signal, received through said second antenna, if said accuracy of said previous signal was insufficient; selecting said first antenna if said accuracy of said previous signal was sufficient and said quality of said previous signal meets a threshold; and selecting one of said first and second antennas by comparing said quality of said first signal preceding said desired signal received through said first antenna with said quality of said first signal preceding said desired signal received through said second antenna if said accuracy of said previous signal was sufficient and said quality of said previous signal failed to meet said threshold.
Claim 9
Dependent Claim
18 words
The method of claim 6 wherein said switched diversity receiver is a time division multiple access (TDMA) receiver.
Claim 10
Dependent Claim
18 words
The method of claim 6 wherein said switched diversity receiver is a code division multiple access (CDMA) receiver.
Claim 11
Dependent Claim
36 words
The method of claim 6 wherein said quality of said previous signal is one of a carrier-to-interference ratio, carrier-to-interference and noise ratio, received signal strength indicator, frame erasure rate, bit error rate, and frame error rate.
Claim 12
Dependent Claim
26 words
The method of claim 6 wherein said step of measuring said accuracy of said previous signal comprises the step of cyclic redundancy checking said previous signal.
Claim 13
Dependent Claim
34 words
The method of claim 6 wherein said step of measuring said accuracy of said previous signal comprises the step of determining one of a frame erasure rate, bit error rate, and frame error rate.
Claim 14
Independent Claim
322 words
A method of operating a switched diversity receiver having a first antenna and a second antenna, said method comprising the steps of: (a) measuring an accuracy of a signal received in a first time slot of a first frame through said first antenna; (b) measuring a quality of said signal received in said first time slot of said first frame through said first antenna; (c) measuring said quality of a first preceding signal received through said first antenna during a first preceding time slot of a second frame if said accuracy of said signal received in said first time slot of said first frame is insufficient; (d) measuring said quality of a second preceding signal received through said second antenna during a second preceding time slot of said second frame if said accuracy of said signal received in said first time slot of said first frame is insufficient; (e) selecting, following steps (c) and (d), one of said first and second antennas based upon a comparison of said quality of said first and second preceding signals; (f) measuring said quality of said first preceding signal received through said first antenna during said first preceding time slot of said second frame if said quality of said signal received in said first time slot of said first frame fails to meet a threshold; (g) measuring said quality of said first preceding signal received through said second antenna during said first preceding time slot of said second frame if said quality of said signal received in said first time slot of said first frame fails to meet said threshold; (i) selecting, following steps (f) and (g), one of said first and second antennas based upon a comparison of said quality of said first and second preceding signals; and (j) selecting said first antenna to receive said desired signal if said accuracy of said signal was sufficient and said quality of said signal meets said threshold.
Claim 15
Independent Claim
322 words
A method of operating a switched diversity receiver having a first antenna and a second antenna, said method comprising the steps of: (a) measuring an accuracy of a signal received in a first time slot of a first frame through said first antenna; (b) measuring a quality of said signal received in said first time slot of said first frame through said first antenna; (c) measuring said quality of a first preceding signal received through said first antenna during a first preceding time slot of a second frame if said accuracy of said signal received in said first time slot of said first frame is insufficient; (d) measuring said quality of a second preceding signal received through said second antenna during a second preceding time slot of said second frame if said accuracy of said signal received in said first time slot of said first frame is insufficient; (e) selecting, following steps (c) and (d), one of said first and second antennas based upon a comparison of said quality of said first and second preceding signals; (f) measuring said quality of said first preceding signal received through said first antenna during said first preceding time slot of said second frame if said quality of said signal received in said first time slot of said first frame fails to meet a threshold; (g) measuring said quality of said first preceding signal received through said second antenna during said first preceding time slot of said second frame if said quality of said signal received in said first time slot of said first frame fails to meet said threshold; (i) selecting, following steps (f) and (g), one of said first and second antennas based upon a comparison of said quality of said first and second preceding signals; and (j) selecting said first antenna to receive said desired signal if said accuracy of said signal was sufficient and said quality of said signal meets said threshold.
Claim 16
Dependent Claim
18 words
The method of claim 12 wherein said switched diversity receiver is a time division multiple access (TDMA) receiver.
Claim 17
Dependent Claim
18 words
The method of claim 12 wherein said switched diversity receiver is a code division multiple access (CDMA) receiver.
Claim 18
Dependent Claim
35 words
The method of claim 12 wherein said quality of said signal is one of a carrier-to-interference ratio, carrier-to-interference and noise ratio, received signal strength indicator, frame erasure rate, bit error rate, and frame error rate.
Claim 19
Dependent Claim
26 words
The method of claim 12 wherein said step of measuring said accuracy of said previous signal comprises the step of cyclic redundancy checking said previous signal.
Claim 20
Dependent Claim
34 words
The method of claim 12 wherein said step of measuring said accuracy of said previous signal comprises the step of determining one of a frame erasure rate, bit error rate, and frame error rate.
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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) | 1999-06-25 | 1999-12-25 | 2000-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-06-25 | 2003-12-25 | 2004-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-06-25 | 2007-12-25 | 2008-06-25 | $7700.00 | Window Closed / Lapsed |