US5644599A
Expired / Lapsed
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Multisite digital radio communication system with signal diversity
Assignee: Motorola Solutions Inc
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Filing: 1994-11-25
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Granted: 1997-07-01
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Expires: 2014-11-25
Abstract
Abstract A radio communications system (100) has multiple receive sites (210, 250) for providing signal diversity for a common source signal. At a receive site (210), data is received on a wireless communication channel (208), and associated signal quality determined for the data received. Coefficients of a time domain function defining the signal quality are determined and transferred, along with the data, to a central site (110). At the central site (110), the data transferred from multiple receive sites (210, 250) is weighted according to the corresponding time domain functions to recover the source signal.
Inventors
- 👤 Garry Carson Hess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:31
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/02; H04B7/04; H04B7/08; H04B7/0837; H04B7/0842; H04B7/0865; H04B7/0848
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
83 words
In a digital radio communications system having a receive site for providing signal diversity, a method comprising the steps of: receiving data representing data symbols on a wireless communication channel; determining a signal quality for the data received; determining coefficients of a time domain function defining the signal quality of the data received, the time domain function and corresponding coefficients describing variations in the signal quality over time; and transferring, to a central site, the data and coefficients of the time domain function.
Claim 2
Dependent Claim
83 words
In a digital radio communications system having a receive site for providing signal diversity, a method comprising the steps of: receiving data representing data symbols on a wireless communication channel; determining a signal quality for the data received; determining coefficients of a time domain function defining the signal quality of the data received, the time domain function and corresponding coefficients describing variations in the signal quality over time; and transferring, to a central site, the data and coefficients of the time domain function.
Claim 3
Dependent Claim
39 words
The method of claim 1, wherein the step of determining a signal quality comprises the step of using a signal quality estimator based on a ratio of desired signal power to a sum of interference power and noise power.
Claim 4
Dependent Claim
40 words
The method of claim 1, wherein the step of determining a signal quality of the data received comprises the step of determining signal quality using a receive signal strength indicator based on a total received signal power for the data.
Claim 5
Dependent Claim
27 words
The method of claim 1, wherein the step of determining coefficients of a time domain function comprises the step of determining the coefficients of a linear function.
Claim 6
Dependent Claim
26 words
The method of claim 1, wherein the step of determining coefficients of a time domain function comprises the step of generating a linear regression curve fit.
Claim 7
Dependent Claim
26 words
The method of claim 1, wherein the step of determining coefficients of a time domain function comprises the step of generating a fast Fourier transform model.
Claim 8
Dependent Claim
25 words
The method of claim 1, further comprising the step of generating a decibel value for signal quality of each data symbol of the data received.
Claim 9
Dependent Claim
37 words
The method of claim 7, wherein the step of determining coefficients of a time domain function comprises the step of generating a fast Fourier transform model for decibel values representing the signal quality of the data symbols.
Claim 10
Dependent Claim
36 words
The method of claim 7, wherein the step of determining coefficients of a time domain function comprises the step of generating a linear regression model for decibel values representing the signal quality of the data symbols.
Claim 11
Dependent Claim
52 words
The method of claim 7, wherein the step of generating a decibel value for signal quality comprises the step of assigning a particular value for the decibel value of the signal quality for a particular data symbol when a measured signal quality for the particular data symbol is within a predetermined range.
Claim 12
Independent Claim
93 words
A method of using signal diversity in a digital radio communications system to recover data packet symbols, comprising the steps of: providing a plurality of data sources; receiving, from each data source, data symbols, and coefficients of a time domain function representing signal quality of the data symbols; generating a corresponding signal quality weight for each data symbol received using the time domain function and the received coefficients; generating symbol products by multiplying each data symbol by the corresponding signal quality weight; and combining the symbol products to recover the data packet symbols.
Claim 13
Independent Claim
93 words
A method of using signal diversity in a digital radio communications system to recover data packet symbols, comprising the steps of: providing a plurality of data sources; receiving, from each data source, data symbols, and coefficients of a time domain function representing signal quality of the data symbols; generating a corresponding signal quality weight for each data symbol received using the time domain function and the received coefficients; generating symbol products by multiplying each data symbol by the corresponding signal quality weight; and combining the symbol products to recover the data packet symbols.
Claim 14
Dependent Claim
63 words
The method of claim 11, further comprising the steps of: determining a sum of the symbol products; comparing the sum with a threshold value; assigning a first symbol to a data packet symbol when the sum is greater or equal to the threshold value; and assigning a second symbol to the data packet symbol when the sum is less than the threshold value.
Claim 15
Dependent Claim
49 words
The method of claim 11, further comprising the steps of: providing a plurality of estimators for transmitted symbols; mapping of a range of symbol products to each of the plurality of estimators; and assigning a corresponding estimator when a transmitted symbol is within a particular range of symbol products.
Claim 16
Dependent Claim
26 words
The method of claim 11, wherein the step of receiving, from each data source, comprises the step of receiving data symbols from a remote receive site.
Claim 17
Independent Claim
171 words
A method of using signal diversity to recover a data packet in a digital radio communications system having a central voting site and at least one remote receive site, comprising the steps of: at the at least one remote receive site: receiving data representing data symbols on a wireless communication channel corresponding to the data packet; measuring signal quality for the data symbols; determining coefficients of a time domain function defining the signal quality of the data symbols; and transferring to the central voting site the data and coefficients of the time domain function; at the central voting site: receiving, from each of the at least one remote receive site, data symbols and coefficients of a time domain function representing the signal quality of the data symbols; generating a corresponding signal quality weight for each data symbol received using the time domain function and the received coefficients; generating symbol products by multiplying each data symbol by the corresponding signal quality weight; and combining the symbol products to recover the data packet.
Claim 18
Independent Claim
171 words
A method of using signal diversity to recover a data packet in a digital radio communications system having a central voting site and at least one remote receive site, comprising the steps of: at the at least one remote receive site: receiving data representing data symbols on a wireless communication channel corresponding to the data packet; measuring signal quality for the data symbols; determining coefficients of a time domain function defining the signal quality of the data symbols; and transferring to the central voting site the data and coefficients of the time domain function; at the central voting site: receiving, from each of the at least one remote receive site, data symbols and coefficients of a time domain function representing the signal quality of the data symbols; generating a corresponding signal quality weight for each data symbol received using the time domain function and the received coefficients; generating symbol products by multiplying each data symbol by the corresponding signal quality weight; and combining the symbol products to recover the data packet.
Claim 19
Dependent Claim
27 words
The method of claim 15, wherein the step of determining coefficients of a time domain function comprises the step of determining the coefficients of a linear function.
Claim 20
Dependent Claim
26 words
The method of claim 15, wherein the step of determining coefficients of a time domain function comprises the step of generating a linear regression curve fit.
Claim 21
Dependent Claim
26 words
The method of claim 15, wherein the step of determining coefficients of a time domain function comprises the step of generating a fast Fourier transform model.
Claim 22
Dependent Claim
25 words
The method of claim 15, further comprising the step of generating a decibel value for signal quality of each data symbol of the data received.
Claim 23
Dependent Claim
37 words
The method of claim 19, wherein the step of determining coefficients of a time domain function comprises the step of generating a fast Fourier transform model for decibel values representing the signal quality of the data symbols.
Claim 24
Dependent Claim
36 words
The method of claim 19, wherein the step of determining coefficients of a time domain function comprises the step of generating a linear regression model for decibel values representing the signal quality of the data symbols.
Claim 25
Dependent Claim
52 words
The method of claim 19, wherein the step of generating a decibel value for signal quality comprises the step of assigning a particular value for the decibel value of the signal quality for a particular data symbol when a measured signal quality for the particular data symbol is within a predetermined range.
References Cited (Backward Citations)
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