Circuitry to establish a wireless communication link

• US 20040087278A1
• Filed: 05/28/2003
• Published: 05/06/2004
• Est. Priority Date: 11/06/2002
• Status: Active Grant

• Current Assignee: NEBO Wireless LLC
• Original Assignee: NEBO Wireless LLC
• Inventors: Lin, Ernie, Giger, Adolf J.
• Granted Patent: US 7,088,961 B2
• Time in Patent Office: Days
• US Class Current: 455/73
• CPC Class Codes: H03G 3/3036 in high-frequency amplifiers or in frequency-changers H03G3/3052, H03G3/32, H03G3/34 take precedence
• CPC Class Codes: H04M 1/725 Cordless telephones user interfaces specially adapted therefor H04M1/724
• CPC Class Codes: H04W 88/02 Terminal devices

Abstract

Circuitry to transmit an analog data signal over a wireless communication link includes a receiver that receives a data signal, an automatic gain control circuit that keeps a peak amplitude of the data signal substantially constant and within a predetermined linear amplification range, and a transmitter, having the predetermined linear amplification range, that receives the data signal from the automatic gain control circuit and that outputs the data signal.

Claims

1. Circuitry to transmit an analog data signal over a wireless communication link, comprising:

a receiver that receives a data signal;

an automatic gain control circuit that keeps a peak amplitude of the data signal substantially constant and within a predetermined linear amplification range; and

a transmitter that receives the data signal from the automatic gain control circuit and that outputs the 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 data signal based on the incoming data signal and outputting the data signal to the automatic gain control circuit.

3. The circuitry of claim 1, wherein the automatic gain control circuit uses a dial tone of a telephone connection to set a gain level for the data signal at a beginning of communication, the gain level remaining substantially constant during communication.

4. The circuitry of claim 2, wherein the data signal output by the hybrid circuit exceeds the predetermined linear amplification range, and the automatic gain control circuit limits a voltage of the data signal output by the hybrid circuit to reduce nonlinear distortion in the transmitter.

5. The circuitry of claim 1, further comprising:

a duplexer that maintains separation between transmitted and received data signals.

6. The circuitry of claim 1, wherein the transmitter comprises a radio frequency transmitter.

7. The circuitry of claim 6, wherein the radio frequency transmitter includes a frequency modulation deviator which performs frequency shift keying modulation of a carrier of the data signal.

8. The circuitry of claim 7, further comprising:

circuitry to reduce a signal voltage of the data signal prior to input to the frequency modulation deviator.

9. 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.

10. An apparatus for transmitting a 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 an 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 predetermined linear amplification range of the radio frequency transmitter.

11. The apparatus of claim 10, wherein the remote unit comprises a handset of a cordless telephone.

12. The apparatus of claim 10, wherein the remote unit comprises a Peripheral Component Microchannel Interconnect Architecture card.

13. The apparatus of claim 10, wherein the remote unit comprises a Universal Serial Bus connector.

14. The apparatus of claim 10, wherein the modem resides in at least one of a laptop computer, a desktop computer, and a personal digital assistant.

15. The apparatus of claim 10, wherein the base unit further comprises:

a radio frequency receiver to receive data from the remote unit.

16. The apparatus of claim 10, 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.

17. The apparatus of claim 16, wherein the analog data signal output by the hybrid circuit exceeds the predetermined linear amplification range of the transmitter, and the automatic gain control circuit limits a voltage level of the analog data signal to reduce nonlinear distortion in the transmitter.

18. The apparatus of claim 10, wherein the base unit further comprises:

a duplexer that maintains separation between transmitted and received data signals.

19. The apparatus of claim 10, wherein the radio frequency transmitter includes a frequency modulation deviator which performs frequency shift keying modulation on the analog data signal.

20. The apparatus of claim 19, wherein the base unit further comprises:

circuitry to reduce a signal voltage of the analog data signal prior to input to the frequency modulation deviator.

21. The apparatus of claim 10, wherein the base unit further comprises:

a microprocessor which sends and receives control signals to the remote unit over the wireless communication link.

22. The apparatus of claim 10, 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 data signal based on the incoming data signal; and

wherein the automatic gain control circuit reduces echoes produced by the hybrid circuit in the outgoing data signal.

23. An apparatus for transmitting data or voice over a wireless communication link, comprising:

means for operating the apparatus as a wireless data link;

means for operating the apparatus as a cordless telephone; and

means for switching operations between the wireless data link and the cordless telephone.

24. The apparatus of claim 23, wherein the means for operating the apparatus as a cordless telephone produces and transmits an analog signal.

25. The apparatus of claim 23, wherein the means for operating the apparatus as a cordless telephone produces and transmits a digital signal.

26. The apparatus of claim 23, wherein the means for operating the apparatus as a wireless data link transmits an analog signal.