Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments

• US 8,229,023 B2
• Filed: 04/19/2011
• Issued: 07/24/2012
• Est. Priority Date: 04/16/1999
• Status: Expired due to Term

• Current Assignee: ParkerVision, Inc.
• Original Assignee: ParkerVision, Inc.
• Inventors: Sorrells, David F., Bultman, Michael J., Cook, Robert W., Looke, Richard C., Moses, Charley D. Jr., Rawlins, Gregory S., Rawlins, Michael W.
• Primary Examiner(s): Kim, Kevin
• Application Number:
  US13/090,031
• Publication Number:
  US 20110194648A1
• Time in Patent Office: 462 Days
• Field of Search: 375/295, 455/118
• US Class Current: 375/295
• CPC Class Codes: H03C 3/40 using two signal paths the outputs of which have a predetermined phase difference and at least one output being amplitude-modulated
• CPC Class Codes: H03D 3/006 by sampling the oscillations and further processing the samples, e.g. by computing techniques H03D3/007 takes precedence
• CPC Class Codes: H03D 7/00 Transference of modulation from one carrier to another, e.g. frequency-changing H03D9/00, H03D11/00 take precedence; dielectric amplifiers, magnetic amplifiers, parametric amplifiers used as a frequency-changers H03F
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: H04W 88/02 Terminal devices

Abstract

Frequency translation and applications of the same are described herein, including RF modem and wireless local area network (WLAN) applications. In embodiments, the WLAN invention includes an antenna, an LNA/PA module, a receiver, a transmitter, a control signal generator, a demodulation/modulation facilitation module, and a MAC interface. The WLAN receiver includes at least one universal frequency translation module that frequency down-converts a received EM signal. In embodiments, the UFT based receiver is configured in a multi-phase embodiment to reduce or eliminate re-radiation that is caused by DC offset. The WLAN transmitter includes at least one universal frequency translation module that frequency up-converts a baseband signal in preparation for transmission over the wireless LAN. In embodiments, the UFT based transmitter is configured in a differential and multi-phase embodiment to reduce carrier insertion and spectral growth.

Claims

1. A method for up-converting a baseband signal, comprising:

receiving in-phase (I) and quadrature-phase (Q) baseband signals;

differentially sampling each of the I and Q baseband signals using first and second control signals to generate first and second harmonically rich signals; and

combining said first and second harmonically rich signals to generate a third harmonically rich signal.

2. The method of claim 1, wherein said differentially sampling step comprises:

inverting each of the I and Q baseband signals to generate inverted I and Q baseband signals;

sampling the I baseband signal and the inverted I baseband signal according to the first and second control signals, respectively; and

sampling the Q baseband signal and the inverted Q baseband signal according to the first and second control signals, respectively.

3. The method of claim 1, wherein the first and second control signals are configured to improve energy transfer to a desired harmonic of the third harmonically rich signal.

4. The method of claim 1, wherein a pulse width of the first and second control signals is configured to improve energy transfer to a desired harmonic of the third harmonically rich signal.

5. The method of claim 1, wherein the first harmonically rich signal and the second harmonically rich signal each includes a plurality of harmonic images, repeating at harmonics of a sampling frequency of the first and second control signals.

6. The method of claim 5, wherein said sampling frequency is equal to a sub-harmonic of the third harmonically rich signal.

7. The method of claim 5, wherein the relative amplitude of a particular harmonic image of said plurality of harmonic images can be adjusted by adjusting a pulse width of the first and second control signals.

8. The method of claim 7, wherein energy transfer into higher frequency harmonics of said plurality of harmonic images is increased by reducing said pulse width of the first and second control signals.

9. The method of claim 7, wherein energy transfer into lower frequency harmonics of said plurality of harmonic images is increased by increasing said pulse width of the first and second control signals.

10. The method of claim 1, wherein said method operates in an infrastructure device.

11. The method of claim 1, wherein said method operates in a client device.

12. The method of claim 1, wherein said method operates in a wireless local area network (WLAN) device.

13. The method of claim 1, wherein the first and second control signals are phase shifted with respect to each other.

14. The method of claim 1, wherein the first and second control signals are phase shifted by 180 degrees relative to each other.

15. The method of claim 1, wherein the third harmonically rich signal includes multiple harmonic images, wherein each of said images contains the baseband information of the I and Q baseband signals.