US5280637A
Expired / Lapsed
US
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Phase combining method and apparatus for use in a diversity receiver
Assignee: Motorola Solutions Inc
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Filing: 1991-09-18
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Granted: 1994-01-18
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Expires: 2011-09-18
Abstract
Abstract A phase combining method and apparatus for use in a diversity reception radiotelephone is described. The phase combining method and apparatus is a hybrid diversity technique which combines elements of maximal ratio combining (MRC) and level comparison selection diversity, which results in a simple and effective implementation of a diversity receiver with superior performance. The diversity receiver demodulates the received signals, extracts the phase, forming two phase signals. Then, the two phase signals are combined to form a third phase signal. One of the three phase signals is selected to be used for interpretation of a symbol in the Quadrature Phase Shift Keying (QPSK) constellation. The selection process is based on the received signal strength of the received signals.
Inventors
- 👤 Christopher P. LaRosa
- 👤 Michael J. Carney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:15
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/02; H04B7/04; H04B7/08; H04B7/0868; H04B7/0874; H04B7/0871; H04B7/0802; H04B7/0837; H04B7/0842; H04B7/0848; H04B7/0857
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
108 words
An apparatus for combining at least a first received signal and a second received signal each received signal having a phase and a signal quality indicator, said apparatus comprising: means for demodulating the first signal, thereby extracting the phase and creating a first phase signal; means for demodulating said second signal, thereby extracting the phase and creating a second phase signal; means for combining said first phase signal and said second phase signal, forming a third phase signal; means for selecting a phase signal from the group consisting of said first, said second and said third phase signals; and means for recovering information from said selected phase signal.
Claim 2
Independent Claim
108 words
An apparatus for combining at least a first received signal and a second received signal each received signal having a phase and a signal quality indicator, said apparatus comprising: means for demodulating the first signal, thereby extracting the phase and creating a first phase signal; means for demodulating said second signal, thereby extracting the phase and creating a second phase signal; means for combining said first phase signal and said second phase signal, forming a third phase signal; means for selecting a phase signal from the group consisting of said first, said second and said third phase signals; and means for recovering information from said selected phase signal.
Claim 3
Dependent Claim
25 words
An apparatus in accordance with claim 1 wherein said means for recovering information further comprises means for selecting a symbol representing said selected phase signal.
Claim 4
Dependent Claim
39 words
An apparatus in accordance with claim 1 wherein said means for combining the phase from said first phase signal and said second phase signal further comprises a modulo-2π average of said first phase signal and said second phase signal.
Claim 5
Dependent Claim
29 words
An apparatus in accordance with claim 1 wherein said means for combining said first phase signal and said second phase signal further comprises an effective maximal ratio combination (MRC).
Claim 6
Dependent Claim
125 words
An apparatus in accordance with claim 1 wherein said means for selecting a phase signal from the group consisting of said first, said second and said third phase signals further comprises: means for comparing the signal quality indicator of the first received signal and the signal quality indicator of the second received signal, including determining a difference between the signal quality indicator of the first received signal and the signal quality indicator of the second received signal and determining the higher signal quality indicator; means for selecting, upon determining said difference is less than a first predetermined threshold, said third phase signal; and means for selecting, upon determining said difference is greater than said predetermined threshold, the received signal having the higher signal quality indicator.
Claim 7
Dependent Claim
17 words
An apparatus in accordance with claim 5 wherein said predetermined threshold is equal to 3 decibels (dB).
Claim 8
Dependent Claim
17 words
An apparatus in accordance with claim 5 wherein said signal quality indicator is the received signal strength.
Claim 9
Independent Claim
100 words
A method of combining at least a first received signal and a second received signal, each received signal having a corresponding phase and a signal quality indicator, the method comprising the steps of: extracting the phase from said first received signal, creating a first phase signal; extracting the phase from said second received signal, creating a second phase signal; combining said first phase signal and said second phase signal, forming a third phase signal; selecting a phase signal from the group consisting of said first, said second and said third phase signals; and recovering information from said selected phase signal.
Claim 10
Independent Claim
100 words
A method of combining at least a first received signal and a second received signal, each received signal having a corresponding phase and a signal quality indicator, the method comprising the steps of: extracting the phase from said first received signal, creating a first phase signal; extracting the phase from said second received signal, creating a second phase signal; combining said first phase signal and said second phase signal, forming a third phase signal; selecting a phase signal from the group consisting of said first, said second and said third phase signals; and recovering information from said selected phase signal.
Claim 11
Dependent Claim
27 words
A method in accordance with claim 8 wherein said step of combining said first phase signal and said second phase signal further comprises a modulo-2π average thereof.
Claim 12
Dependent Claim
30 words
A method in accordance with claim 8 wherein said step of combining said first phase signal and said second phase signal further comprises an effective maximal ratio combination (MRC) thereof.
Claim 13
Dependent Claim
118 words
A method in accordance with claim 8 wherein said step of selecting a phase signal from the group consisting of said first, said second and said third phase signals further comprises: comparing the signal quality indicator of the first received signal and the signal quality indicator of the second received signal, including determining a difference between the signal quality indicator of the first received signal and the signal quality indicator of the second received signal and determining the higher signal quality indicator; selecting, upon determining said difference is less than a predetermined threshold, said third phase signal; and selecting, upon determining said difference is greater than said predetermined threshold, the received signal having the higher signal quality indicator.
Claim 14
Dependent Claim
17 words
A method in accordance with claim 11, wherein said predetermined threshold is equal to 3 decibels (dB).
Claim 15
Dependent Claim
17 words
A method in accordance with claim 11 wherein the signal quality indicator is the received signal strength
Claim 16
Dependent Claim
23 words
A method in accordance with claim 8 wherein said step of recovering information further comprising selecting a symbol representing said selected phase signal.
Claim 17
Dependent Claim
184 words
A radiotelephone including at least a first antenna and a second antenna, at least a first radio frequency (RF) receiver and a second RF receiver and a diversity phase combiner, the first RF receiver and the second RF receiver coupled to the first antenna and the second antenna respectively, the first RF receiver and the second RF receiver outputting a first received signal and a second received signal, each received signal having a received signal strength (RSS) and a phase, the radiotelephone comprising: means for demodulating said first received signal, thereby extracting the phase and creating a first phase signal; means for demodulating said second received signal, thereby extracting the phase and creating a second phase signal; means for combining said first phase signal and said second phase signal, forming a third phase signal; means for selecting a phase signal from the group consisting of said first, said second and said third phase signals; means for selecting a symbol representing said selected phase signal; means for formatting said selected symbols into a sound pattern; and means for communicating said sound pattern to a user.
Claim 18
Dependent Claim
184 words
A radiotelephone including at least a first antenna and a second antenna, at least a first radio frequency (RF) receiver and a second RF receiver and a diversity phase combiner, the first RF receiver and the second RF receiver coupled to the first antenna and the second antenna respectively, the first RF receiver and the second RF receiver outputting a first received signal and a second received signal, each received signal having a received signal strength (RSS) and a phase, the radiotelephone comprising: means for demodulating said first received signal, thereby extracting the phase and creating a first phase signal; means for demodulating said second received signal, thereby extracting the phase and creating a second phase signal; means for combining said first phase signal and said second phase signal, forming a third phase signal; means for selecting a phase signal from the group consisting of said first, said second and said third phase signals; means for selecting a symbol representing said selected phase signal; means for formatting said selected symbols into a sound pattern; and means for communicating said sound pattern to a user.
Claim 19
Dependent Claim
36 words
A radiotelephone in accordance with claim 15 wherein said means for combining said first phase signal and said second phase signal further comprises a modulo-2π average of said first phase signal and said second phase signal.
Claim 20
Dependent Claim
30 words
A radiotelephone in accordance with claim 15 wherein said means for combining said first phase signal and said second phase signal further comprises an effective maximal ratio combination (MRC) thereof.
Claim 21
Dependent Claim
110 words
A radiotelephone in accordance with claim 15 wherein said means for selecting a phase signal from the group consisting of said first, said second and said third phase signals further comprising: means for comparing the RSS of the first received signal and the RSS of the second received signal, including determining a difference between the RSS of the first signal and the RSS of the second signal and determining the larger RSS; means for selecting, upon determining said difference is less than a predetermined threshold, said third phase signal; and means for selecting, upon determining said difference is greater than said predetermined threshold, the received signal having the larger RSS.
Claim 22
Dependent Claim
15 words
A radiotelephone in accordance with claim 18, wherein said predetermined threshold is 3 decibels (dB).
Claim 23
Dependent Claim
16 words
A radiotelephone in accordance with claim 15 wherein said means for communicating is an user interface.
Claim 24
Dependent Claim
20 words
A radiotelephone in accordance with claim 15 wherein said means for formatting further comprises a microprocessor and a memory device.
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