Automatic gain control loop
First Claim
1. In a wireless telecommunications system, an automatic gain control loop for a base station having a plurality of antennas for receiving a signal within a cell site, said automatic gain control loop comprising:
- a demodulator coupled to one of said antennas, so as to receive and demodulate said signal, said demodulator having at least one output terminal, to route a demodulated phase signal into a plurality of separate branches via said at least one output terminal, said demodulated phase signal corresponding to the phase of said received signal;
a plurality of variable-gain amplifiers each adapted to receive said phase signals to variably change the amplitude of said phase signals; and
a plurality of signal processing units each adapted so as to receive signals provided by said variable amplifiers via one of said separate branches, each of said signal processing units further adapted to provide a feedback control signal to a corresponding one of said variable amplifiers so as to control the gain of each one of said variable amplifiers.
6 Assignments
0 Petitions
Accused Products
Abstract
In accordance with one embodiment of the present invention, in a wireless telecommunications system, an automatic gain control loop for a base station, comprises a demodulator having at least one output terminal. The demodulator is adapted to demodulate signals received by the base station so as to provide a plurality of phase signals via its output terminals. These phase signals correspond to the phase of the signals received by the base station. A plurality of variable-gain amplifiers are adapted to receive one of the phase signals and to change the amplitude of said phase signals. A plurality of signal processing units are adapted so as to receive signals provided by the variable amplifiers, and each of the signal processing units is further adapted to generate a feedback control signal so as to control the gain of each one of the variable-gain amplifiers. In accordance with another embodiment of the invention, a method for controlling the gain of signals received by a base station in a cellular communication system comprises the steps of demodulating the signals so as to generate phase signals corresponding to the received signals, variably controlling the magnitude of each one of the phase signals based on a feedback control signal, and processing the phase signals so as to generate the feedback control signal.
-
Citations
19 Claims
-
1. In a wireless telecommunications system, an automatic gain control loop for a base station having a plurality of antennas for receiving a signal within a cell site, said automatic gain control loop comprising:
-
a demodulator coupled to one of said antennas, so as to receive and demodulate said signal, said demodulator having at least one output terminal, to route a demodulated phase signal into a plurality of separate branches via said at least one output terminal, said demodulated phase signal corresponding to the phase of said received signal; a plurality of variable-gain amplifiers each adapted to receive said phase signals to variably change the amplitude of said phase signals; and a plurality of signal processing units each adapted so as to receive signals provided by said variable amplifiers via one of said separate branches, each of said signal processing units further adapted to provide a feedback control signal to a corresponding one of said variable amplifiers so as to control the gain of each one of said variable amplifiers. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. In a wireless telecommunications system, an automatic gain control loop for a base station having a plurality of antennas for receiving a signal within a cell site, said automatic gain control loop comprising:
-
a demodulator coupled to one of said antennas, so as to receive and demodulate said signal, said demodulator having at least one output terminal, to route a demodulated phase signal into a plurality of separate branches via said at least one output terminal; a plurality of low pass filters coupled to the output terminals of said demodulator; a plurality of variable attenuators each adapted to receive said low pass filtered signals provided by said low pass filters; and a plurality of signal processing units each adapted so as to receive signals provided by said variable attenuators, via one of said separate branches each of said signal processing units further adapted to provide a feedback control signal to a corresponding one of said variable attenuators so as to control the attenuation of each one of said variable attenuators. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
-
-
17. A method for controlling the gain of a signal received by a base station having a plurality of antennas for receiving said signal within a cell site in a cellular communication system comprising the steps of:
-
demodulating said signal received by one of said antennas so as to provide demodulated phase signals via separate branches to a plurality of variable amplifiers; variably controlling the magnitude of each one of said phase signals based on a feedback control signal provided to each one of said variable amplifiers; and processing said phase signals by a plurality of signal processors such that each signal processor generates said feedback control signal. - View Dependent Claims (18, 19)
-
Specification