EP0115139A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Improvements in or relating to radio communication apparatus and systems
Assignee: AT&T Inc
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Filing: 1983-12-12
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Granted: —
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Expires: 2003-12-12
Abstract
Abstract In a radio communication system, an adaptive transmitter power control system is described wherein the signal level at each receiver is monitored and a control signal, which is a function of the signal level, is transmitted back to the transmitting station to adjust the transmitter output power, as required. By transmitting the lowest power level consistent with system objectives, the repeater circuits operate in a highly linear mode, and cochannel interference is significantly reduced.
Inventors
- 👤 Adolf Josef Giger
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 14:55
CPC Classifications
H; H04; H04W; H04W52/00; H04W52/04; H04W52/52
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
55 words
Radio communication apparatus including a transmitter (10), a receiver (13), and characterised by the receiver being for receiving from a distant site a control signal representative of a magnitude of the signal received at that site from the transmitter, and means (14,41) responsive to the control signal for varying the output power of the transmitter.
Claim 2
Dependent Claim
55 words
Radio communication apparatus including a transmitter (10), a receiver (13), and characterised by the receiver being for receiving from a distant site a control signal representative of a magnitude of the signal received at that site from the transmitter, and means (14,41) responsive to the control signal for varying the output power of the transmitter.
Claim 3
Dependent Claim
38 words
Apparatus as claimed in claim 1 wherein the control signal includes an a.c. signal representative of the magnitude (V ac ), and the responsive means includes a frequency modulation discriminator ( 4 1) fed by the a.c. signal.
Claim 4
Dependent Claim
30 words
Apparatus as claimed in claim 2 wherein the output of the discriminator (VdC) is coupled to an automatic gain control circuit (14) in the transmitter to vary the output power.
Claim 5
Dependent Claim
79 words
A radio communication system including a transmitter (10), a remotely located receiver (11), and means (1 4 ) for controlling the output power of the transmitter, characterised by means (22), at the receiver, for sensing the magnitude of the received signal, means (31) for generating a control signal representative of the magnitude, means (12) for transmitting the control signal back to the transmitter, and means (26,41,14), responsive to the control signal for varying the output power of the transmitter.
Claim 6
Dependent Claim
79 words
A radio communication system including a transmitter (10), a remotely located receiver (11), and means (1 4 ) for controlling the output power of the transmitter, characterised by means (22), at the receiver, for sensing the magnitude of the received signal, means (31) for generating a control signal representative of the magnitude, means (12) for transmitting the control signal back to the transmitter, and means (26,41,14), responsive to the control signal for varying the output power of the transmitter.
Claim 7
Dependent Claim
53 words
A system as claimed in claim 4 wherein the sensing means includes an automatic gain control circuit (22), the generating means includes a frequency modulation deviator (31), and the varying means includes a frequency modulation discriminator ( 4 1) whose output is coupled to an automatic gain control circuit (14) in the transmitter.
Claim 8
Dependent Claim
64 words
Radio communication apparatus including, at a common site, a transmitter (10) for transmitting signals in one direction, a receiver (13) for receiving signals propagating in the opposite direction, and characterised by means (26) for sensing a magnitude of the signal received by the receiver, and means (41) for coupling the output of the sensing means to the transmitter for varying the output power thereof.
Claim 9
Dependent Claim
64 words
Radio communication apparatus including, at a common site, a transmitter (10) for transmitting signals in one direction, a receiver (13) for receiving signals propagating in the opposite direction, and characterised by means (26) for sensing a magnitude of the signal received by the receiver, and means (41) for coupling the output of the sensing means to the transmitter for varying the output power thereof.
Claim 10
Dependent Claim
45 words
Apparatus as claimed in claim 6 wherein the sensing means output is an a.c. signal (Vac) representative of the magnitude, and the coupling means includes a frequency modulation discriminator (41) fed by the a.c. signal, and means for coupling the discriminator output to the transmitter.
Claim 11
Dependent Claim
38 words
Apparatus as claimed in claim 7 wherein the sensing means includes an automatic gain control circuit (26) in the receiver, and the output from the discriminator is coupled to an automatic gain control circuit (14) in the transmitter.
Claim 12
Dependent Claim
61 words
Radio communication apparatus including at a common site, a transmitter (12) for transmitting signals in one direction, a receiver (11) for receiving signals propagating in the opposite direction, and characterised by means (22) for sensing a magnitude of the signal received by the receiver, and means (30) for coupling the output of the sensing means to the transmitter for transmission thereby.
Claim 13
Dependent Claim
61 words
Radio communication apparatus including at a common site, a transmitter (12) for transmitting signals in one direction, a receiver (11) for receiving signals propagating in the opposite direction, and characterised by means (22) for sensing a magnitude of the signal received by the receiver, and means (30) for coupling the output of the sensing means to the transmitter for transmission thereby.
Claim 14
Dependent Claim
52 words
Apparatus as claimed in claim 9 wherein the output of the sensing means includes a d.c. component (V dC ) representative of the magnitude, and the coupling means includes a frequency modulation deviator (31) fed by the d.c. component, and means for coupling the deviator output to the transmitter for transmission thereby.
Claim 15
Dependent Claim
38 words
Apparatus as claimed in claim 10 wherein the sensing means includes an automatic gain control circuit (22) in the receiver, and the output from the deviator is coupled to an automatic gain control circuit (17) in the transmitter.
References Cited (Backward Citations)
No citation records indexed.
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