Circuitry to establish a wireless communication link

Abstract

An apparatus transmits an analog data signal over a wireless communication link. The apparatus includes a base unit having a wired connection to a telephone line. The base unit transmits data to and from the telephone line via the wired connection. The apparatus also includes a remote unit having a wired connection to a modem. The remote unit transmits data to and from the modem via the wired connection. The remote unit and the base unit communicate with each other over the wireless communication link. The base unit includes a radio frequency transmitter to transmit the analog data signal to the remote unit and an automatic gain control circuit that keeps a peak amplitude of the analog data signal substantially constant and within a linear amplification range of the radio frequency transmitter.

What is claimed is:  
     
         1 . Circuitry to transmit an analog data signal over a wireless communication link, comprising: 
 an automatic gain control circuit that receives the analog data signal and that keeps a peak amplitude of the analog data signal substantially constant and within a predetermined linear amplification range; and    a transmitter that receives the analog data signal from the automatic gain control circuit and that outputs the analog data signal, the transmitter having the predetermined linear amplification range.    
     
     
         2 . The circuitry of  claim 1 , further comprising: 
 a hybrid circuit that isolates an incoming data signal from an outgoing data signal, the hybrid circuit producing the analog data signal based on the incoming data signal and outputting the analog data signal to the automatic gain control circuit.    
     
     
         3 . The circuitry of  claim 2 , wherein the analog data signal produced by the hybrid circuit exceeds a linear amplification range of the transmitter, and the automatic gain control circuit limits a voltage of the analog data signal.  
     
     
         4 . The circuitry of  claim 1 , further comprising: 
 a duplexer that maintains separation between transmitted and received signals.    
     
     
         5 . The circuitry of  claim 1 , wherein the transmitter comprises a radio frequency (RF) transmitter.  
     
     
         6 . The circuitry of  claim 5 , wherein the RF transmitter includes a frequency modulation (FM) deviator which performs FM modulation of an RF carrier of the analog data signal.  
     
     
         7 . The circuitry of  claim 6 , further comprising: 
 circuitry to reduce a signal voltage of the analog data signal prior to input to the FM deviator.    
     
     
         8 . The circuitry of  claim 1 , further comprising: 
 a microprocessor which sends and receives control signals to a remote unit that communicates with the circuitry over the wireless communication link.    
     
     
         9 . An apparatus for transmitting an analog data signal over a wireless communication link, comprising: 
 a base unit having a wired connection to a telephone line, the base unit transmitting data to and from the telephone line via the wired connection; and    a remote unit having a wired connection to a modem, the remote unit transmitting data to and from the modem via the wired connection, the remote unit and the base unit communicating with each other over the wireless communication link;    wherein the base unit comprises: 
 a radio frequency transmitter to transmit the analog data signal to the remote unit; and  
 an automatic gain control circuit that keeps a peak amplitude of the analog data signal substantially constant and within a linear amplification range of the radio frequency transmitter.  
   
     
     
         10 . The apparatus of  claim 9 , wherein the base unit further comprises: 
 a radio frequency receiver to receive data from the remote unit.    
     
     
         11 . The apparatus of  claim 9 , wherein the base unit further comprises: 
 a hybrid circuit that isolates an incoming data signal from an outgoing data signal, the hybrid circuit producing the analog data signal based on the incoming data signal and outputting the analog data signal to the automatic gain control circuit.    
     
     
         12 . The apparatus of  claim 9 , wherein the analog data signal output by the hybrid circuit exceeds a linear amplification range of the transmitter, and the automatic gain control circuit limits a voltage of the analog data signal.  
     
     
         13 . The apparatus of  claim 9 , wherein the base unit further comprises: 
 a duplexer that maintains separation between RF transmitted and received signals.    
     
     
         14 . The apparatus of  claim 9 , wherein the RF transmitter includes a frequency modulation (FM) deviator which performs FM modulation on the analog data signal.  
     
     
         15 . The apparatus of  claim 14 , wherein the base unit further comprises: 
 circuitry to reduce a signal voltage of the analog data signal prior to input to the FM deviator.    
     
     
         16 . The apparatus of  claim 9 , wherein the base unit further comprises: 
 a microprocessor which sends and receives control signals to the remote unit over the wireless communication link.    
     
     
         17 . The apparatus of  claim 9 , wherein the remote unit further comprises: 
 a hybrid circuit that isolates an incoming data signal from an outgoing data signal, the hybrid circuit producing an output analog data signal based on the incoming data signal; and    an automatic gain control circuit to reduce echoes produced by the hybrid circuit in the output analog data signal.    
     
     
         18 . An apparatus for transmitting data or voice over a wireless communication link, comprising: 
 means for operating the apparatus as a wireless data link; and    means for operating the apparatus as an analog cordless telephone.    
     
     
         19 . The apparatus of  claim 18 , wherein an analog data signal is transmitted over the wireless data link.  
     
     
         20 . The apparatus of  claim 18 , wherein an analog voice signal is transmitted over the wireless link.  
     
     
         21 . The apparatus of  claim 18 , wherein the apparatus comprises a cordless telephone, a base unit comprising a cordless telephone base unit, and a remote unit comprising a handset for a cordless telephone.  
     
     
         22 . The apparatus of  claim 21 , wherein the remote unit further comprises a speaker, a microphone, and a dialing pad.