EP0477158A2
Expired / Lapsed
EP
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Diversity receiving system
Assignee: Ericsson Inc
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Filing: 1991-09-20
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Granted: —
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Expires: 2011-09-20
Abstract
Abstract Two or more signal paths are provided for receiving a radio frequency signal. One or more signal paths include conventional bandpass filters for eliminating interference and noise signals. One or more remaining signal paths include reduced filtering devices for increasing the sensitivity of a radio frequency receiver to the desired signal. Each of the receiving paths is coupled to a respective radio frequency amplifier. Provided that each radio frequency amplifier has equivalent current-source output impedances, the output signals from each amplifier are added constructively if they are in-phase. If the output signals are out-of-phase, a phase inverter inverts the phase of one signal so that the signals may be added constructively. The combined signals of the two or more radio frequency amplifiers pass through various signal processing components associated with conventional superheterodyne receivers. A control unit produces gain variation signals for controlling the gain of each radio frequency amplifier. Accordingly, the control unit controls whether the desired signal is received from a first signal path, a second signal path, or as a weighted combination of two or more signal paths.
Inventors
- 👤 Paul Wilkinson Dent
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 10:53
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/02; H04L1/06; H04B; H04B7/00; H04B7/02; H04B7/04; H04B7/08; H04B7/0837; H04B7/0842; H04B7/0848; H04B7/0857
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
84 words
A radio receiver for receiving a radio frequency signal and generating a desired output signal, comprising: plural signal paths for receiving said radio frequency signal, each signal path including: filtering means for filtering said received signal; and amplifier means for amplifying said filtered signal and generating an amplified signal; control means, connected to each of said amplifier means, for selectively combining one or more of said amplified signals from their corresponding signal paths to increase sensitivity to desired information in said radio frequency signal.
Claim 2
Dependent Claim
84 words
A radio receiver for receiving a radio frequency signal and generating a desired output signal, comprising: plural signal paths for receiving said radio frequency signal, each signal path including: filtering means for filtering said received signal; and amplifier means for amplifying said filtered signal and generating an amplified signal; control means, connected to each of said amplifier means, for selectively combining one or more of said amplified signals from their corresponding signal paths to increase sensitivity to desired information in said radio frequency signal.
Claim 3
Dependent Claim
27 words
The system as described in claim 1, wherein said control means selects a single signal path that results in said output signal having an optimal signal quality.
Claim 4
Dependent Claim
33 words
The system as described in claim 1, wherein said control means selectively adapts a gain of at least one of said amplifier means and measures a measured signal quality of said output signal.
Claim 5
Dependent Claim
20 words
The system as described in claim 3, wherein said measured signal quality is a signal strength of said output signal.
Claim 6
Dependent Claim
21 words
The system as described in claim 3, wherein said measured signal quality is a bit error rate of said output signal.
Claim 7
Dependent Claim
58 words
The system as described in claim 1, wherein said control means tests a plurality of selective combinations of said signal paths, each combination having a different gain for one or more of said amplifier means, and determines said signal quality of said output signal based on a measured signal strength of said output signal corresponding to each combination.
Claim 8
Dependent Claim
118 words
A radio receiving apparatus for receiving a radio frequency signal and generating a desired output signal, comprising: plural signal paths for receiving a radio frequency signal, each signal path including: filtering means for filtering said received signal; amplifier means for amplifying said filtered signal and generating an amplified signal; combining means, connected to said amplifier means, for adaptively combining amplified signals from each of said signal paths; processing means, connected to said combining means, for processing said combined amplified signals and generating a processed signal; and control means, connected to said processing means, for detecting a characteristic of said processed signal and for generating control signals for adaptively weighting each of said amplified signals in said combining means.
Claim 9
Dependent Claim
118 words
A radio receiving apparatus for receiving a radio frequency signal and generating a desired output signal, comprising: plural signal paths for receiving a radio frequency signal, each signal path including: filtering means for filtering said received signal; amplifier means for amplifying said filtered signal and generating an amplified signal; combining means, connected to said amplifier means, for adaptively combining amplified signals from each of said signal paths; processing means, connected to said combining means, for processing said combined amplified signals and generating a processed signal; and control means, connected to said processing means, for detecting a characteristic of said processed signal and for generating control signals for adaptively weighting each of said amplified signals in said combining means.
Claim 10
Dependent Claim
29 words
The system as claimed in claim 7, wherein said control signals are bias voltages applied to each of said amplifier means to vary the magnitude of said amplified signals.
Claim 11
Dependent Claim
15 words
The system as claimed in claim 8, wherein said bias voltage controls the amplifier gain.
Claim 12
Dependent Claim
35 words
The system as claimed in claim 7, wherein said control means sequentially tests combinations of receiving paths by systematically modifying the number of receiving paths and the weighting applied to each of said amplified signals.
Claim 13
Dependent Claim
45 words
The system as claimed in claim 7, further comprising: phase inverting means, connected to the output of at least one of said amplifier means, for inverting the phase of at least one amplified signal to constructively combine amplified signals from each of said signal path.
Claim 14
Dependent Claim
48 words
The system as claimed in claim 11, wherein said phase inverting means includes plural alternative phase shifts and said control means sequentially selects each one of said plural alternative phase shifts to determine a combination of signal paths that results in said processed signal of highest signal quality.
Claim 15
Dependent Claim
40 words
The system as claimed in claim 7, wherein said control means sequentially selects a variety of signal path combinations and measures the signal quality of said processed signal under each of said signal path combinations to determine an optimal combination.
Claim 16
Dependent Claim
24 words
The system as claimed in claim 13, wherein said control means statistically determines said processed signal having the highest probability of high signal quality.
Claim 17
Dependent Claim
39 words
The system as claimed in claim 13, wherein said received signal is time division multiplexed with other information and said control means determines said optimal combination during time periods when said other information is being received by other receivers.
Claim 18
Dependent Claim
24 words
The system as claimed in claim 13, wherein said signal quality is determined as a function of bit error rate of said information signal.
Claim 19
Dependent Claim
138 words
A radio receiving apparatus for receiving a radio frequency signal and generating a desired output signal, comprising: plural signal paths for receiving a radio frequency signal, each signal path including: filtering means for filtering said received signal; and amplifier means for amplifying said filtered signal and generating an amplified signal; processing means, selectively connected to each of said amplifier means in each signal path, for processing a combination of said amplified signals and generating a processed signal; frequency mixing means for changing the frequency of said processed signal; demodulation means for demodulating the output signal from said frequency mixing means and generating an information signal; and control means, connected to said demodulation means, for detecting a characteristic of said information signal and for generating control signals for selectively emphasizing the influence of each signal path on said combination.
Claim 20
Dependent Claim
138 words
A radio receiving apparatus for receiving a radio frequency signal and generating a desired output signal, comprising: plural signal paths for receiving a radio frequency signal, each signal path including: filtering means for filtering said received signal; and amplifier means for amplifying said filtered signal and generating an amplified signal; processing means, selectively connected to each of said amplifier means in each signal path, for processing a combination of said amplified signals and generating a processed signal; frequency mixing means for changing the frequency of said processed signal; demodulation means for demodulating the output signal from said frequency mixing means and generating an information signal; and control means, connected to said demodulation means, for detecting a characteristic of said information signal and for generating control signals for selectively emphasizing the influence of each signal path on said combination.
Claim 21
Dependent Claim
35 words
The system as claimed in claim 17, wherein said control means sequentially tests combinations of receiving paths by systematically modifying the number of receiving paths and the weighting applied to each of said amplified signals.
Claim 22
Dependent Claim
45 words
The system as claimed in claim 17, further comprising: phase inverting means, connected to the output of at least one of said amplifier means, for inverting the phase of at least one amplified signal to constructively combine amplified signals from each of said signal path.
Claim 23
Dependent Claim
48 words
The system as claimed in claim 19, wherein said phase inverting means includes plural alternative phase shifts and said control means sequentially selects each one of said plural alternative phase shifts to determine a combination of signal paths that results in said processed signal of highest signal quality.
Claim 24
Dependent Claim
40 words
The system as claimed in claim 17, wherein said control means sequentially selects a variety of signal path combinations and measures the signal quality of said processed signal under each of said signal path combinations to determine an optimal combination.
Claim 25
Dependent Claim
24 words
The system as claimed in claim 21, wherein said control means statistically determines said processed signal having the highest probability of high signal quality.
Claim 26
Dependent Claim
39 words
The system as claimed in claim 21, wherein said received signal is time division multiplexed with other information and said control means determines said optimal combination during time periods when said other information is being received by other receivers.
Claim 27
Dependent Claim
24 words
The system as claimed in claim 21, wherein said signal quality is determined as a function of bit error rate of said information signal.
References Cited (Backward Citations)
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