Method and apparatus to generate a clock-based transmission

• US 20040125859A1
• Filed: 12/31/2002
• Published: 07/01/2004
• Est. Priority Date: 12/31/2002
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Ho, Minnie, Green, Evan, Foerster, Jeffrey
• Granted Patent: US 7,292,620 B2
• Time in Patent Office: Days
• US Class Current: 375/146
• CPC Class Codes: H04B 1/69 Spread spectrum techniques

Abstract

A method and apparatus are disclosed to generate and/or receive ultra-wide bandwidth (UWB) pulses using a digital clock.

Claims

1. A method comprising deriving a direct sequence ultrawide bandwidth signal from a digitally produced clock signal and data.

2. The method of claim 1, wherein deriving said ultrawide bandwidth signal comprises:

modulating the clock signal with said data to obtain a modulated signal; and

gating the modulated signal to obtain said ultrawide bandwidth signal.

3. The method of claim 1, wherein deriving said ultrawide bandwidth signal comprises:

digitally producing said clock signal;

modulating the clock signal with said data to obtain a modulated signal; and

shaping the modulated signal to obtain said ultrawide bandwidth signal.

4. The method as in claim 3, wherein shaping the modulated signal comprises filtering said modulated signal.

5. The method as in claim 3, wherein shaping the modulated signal comprises windowing the clock signal with a function of said modulated signal.

6. The method of claim 3, wherein modulating the clock signal with data comprises:

inverting said clock signal to obtain an inverted clock signal; and

modulating said inverted clock signal with said data using an AND gate.

7. The method of claim 3, wherein modulating the clock signal with data comprises:

buffering said clock signal to obtain a buffered clock signal; and

modulating said buffered clock signal with said data using a NAND gate.

8. A method comprising:

receiving data;

producing a code based on said data using a digital clock; and

transmitting said code as a direct sequence waveform.

9. The method of claim 8, wherein producing said code comprises selecting said code using a word selector.

10. The method of claim 9, wherein transmitting said code comprises:

multiplexing said code to produce a single-bit stream; and

transmitting said single-bit stream.

11. The method of claim 10, wherein receiving data comprises receiving said data at a shift register.

12. The method of claim 8, wherein transmitting said code comprises transmitting said code as a pulsed direct sequence waveform.

13. The method of claim 8, wherein transmitting said code comprises transmitting said code as a sub-banded direct sequence waveform.

14. A method comprising:

receiving an ultrawide bandwidth signal; and

extracting data from said ultrawide bandwidth signal using a digitally produced clock signal.

15. The method of claim 14, wherein receiving said ultrawide bandwidth signal comprises receiving a direct sequence waveform signal.

16. The method of claim 14, wherein receiving said ultrawide bandwidth signal comprises receiving a pulsed direct sequence signal.

17. The method of claim 14, wherein receiving said ultrawide bandwidth signal comprises receiving a sub-banded direct sequence signal.

18. A method comprising:

receiving an incoming signal;

multiplying said incoming signal with a template signal to produce an output signal; and

time synchronizing said output signal.

19. The method of claim 18 further comprising:

using a code generator to produce said template signal.

20. The method of claim 19, wherein using said code generator comprises driving said code generator by a variable delayed signal based on a clock signal.

21. An apparatus comprising:

a digital clock to produce a digital clock signal;

a modulator to modulate the clock signal with data to produce a modulated signal; and

a shaping unit to shape the modulated signal.

22. An apparatus as in claim 21 further comprising a bandpass filter to reduce higher-order harmonics in the modulated signal.

23. A system comprising:

a digital clock to produce a digital clock signal;

a modulator to modulate the clock signal with data, thereby to produce a modulated signal;

a shaping unit to shape the modulated signal; and

a dipole antenna to transmit the modulated signal.

24. The system of claim 23 further comprising a bandpass filter to reduce higher-order harmonics in the modulated signal.

25. The system of claim 24, wherein said bandpass filter is a Bessel bandpass filter.