Pulse shaping optimizer in UWB receiver

• US 20060160516A1
• Filed: 01/13/2006
• Published: 07/20/2006
• Est. Priority Date: 01/14/2005
• Status: Abandoned Application

• Current Assignee: Honeywell International Inc.
• Original Assignee: Honeywell International Inc.
• Inventors: Zaghloul, Amir, Annamalai, Annamalai, Zeng, Dongsong
• Application Number:
  US11/331,922
• Publication Number:
  US 20060160516A1
• Time in Patent Office: Days
• US Class Current: 455/293
• CPC Class Codes: H04B 1/71637 Receiver aspects H04B1/7183 takes precedence
• CPC Class Codes: H04L 25/0202 Channel estimation
• CPC Class Codes: H04L 25/03006 Arrangements for removing intersymbol interference
• CPC Class Codes: H04L 25/03828 Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties partial response systems H04L25/497

Abstract

A receiver for receiving a signal is provided. The receiver comprises a pulse shaper that shapes a received signal using a transfer function, the pulse shaper being adapted to determine a set of coefficients for the transfer function based on the received signal. The receiver also comprises a mixer that mixes the shaped signal with a generated template to create a mixed signal, and an integrator that integrates the mixed signal to generate an integrated signal.

Claims

1. A receiver for receiving a signal comprising:

a pulse shaper that shapes a received signal using a transfer function, the pulse shaper being adapted to determine a set of coefficients for the transfer function based on the received signal;

a mixer that mixes the shaped signal with a generated template to create a mixed signal; and

an integrator that integrates the mixed signal to generate an integrated signal.

2. The receiver of claim 1, further comprising:

a demodulator adapted to extract at least a portion of modulated data from the integrated signal.

3. The receiver of claim 1, wherein the receiver comprises an ultra wideband receiver.

4. The receiver of claim 1, wherein the pulse shaper comprises an all-pass filter.

5. The receiver of claim 1, wherein the pulse shaper comprises:

at least one processor adapted to perform instructions containing methods for shaping the received signal with a transfer function having coefficients determined by a genetic algorithm.

6. The receiver of claim 1, wherein the pulse shaper comprises of one of a field programmable gate array and an application specific integrated circuit.

7. The receiver of claim 1, wherein the pulse shaper is adapted to determine the set of coefficients for the transfer function using a genetic algorithm.

8. The receiver of claim 1, wherein the pulse shaper periodically updates the coefficients of the transfer function based on the received signal.

9. A method of improving performance of a receiver, the method comprising:

receiving a signal;

determining coefficients for a transfer function based on the received signal;

shaping the signal using the transfer function in order to generate a shaped signal; and

correlating the shaped signal with a template signal.

10. The method of claim 9, further comprising:

demodulating the correlated signal to extract at least a portion of modulated data on the received signal.

11. The method of claim 9, further comprising one or more of:

periodically updating transfer function coefficients; and

updating transfer function coefficients when a pre-determined condition is met.

12. The method of claim 9, wherein determining coefficients for a transfer function further comprises:

using a genetic algorithm to determine transfer function coefficients.

13. The method of claim 12, wherein using a genetic algorithm further comprises:

initializing the genetic algorithm by randomly selecting N input argument vectors that all satisfy coefficient constraints; and

performing one or more of a selection process, a crossing process and a mutation process.

14. The method of claim 13, further comprising one or more of:

ending the genetic algorithm when it is determined that an evolution cycle limit is reached; and

ending the genetic algorithm when it is determined that values obtained from the genetic algorithm are within a selected range of tolerance.

15. The method of claim 9, wherein determining coefficients for a transfer function further comprises:

digitally determining coefficients for a transfer function.

16. The method of claim 15, further comprising:

transforming the digital transfer function to an analog transfer function.

17. The method of claim 16, wherein transforming the digital transfer function further comprises using one of a bilinear transform and a Pade polynomial approximation.

18. A communications system comprising:

a transmitter adapted to transmit a modulated signal generated using a pulse-based modulation scheme; and

a receiver adapted to receive and shape the transmitted signal using a transfer function having coefficients based on the received signal and determined from a genetic algorithm.

19. The communications system of claim 18, wherein the transmitter comprises an ultra wideband transmitter and the receiver comprises an ultra wideband receiver.

20. The communications system of claim 18, wherein the receiver further comprises:

a pulse shaper adapted to shape the received signal using the transfer function;

a mixer adapted to mix the shaped signal with a template signal; and

an integrator adapted to integrate the mixed signal.

21. The communications system of claim 20, wherein the receiver further comprises:

a template signal source adapted to generate a template to be mixed with the received signal.

22. The communications system of claim 20, wherein the receiver further comprises:

a demodulator adapted to extract at least a portion of modulated data from the integrated signal.

23. The communications system of claim 20, wherein the pulse shaper comprises an all-pass filter.

24. A receiver for receiving a signal comprising:

means for receiving a pulse-based modulated signal;

means for performing a genetic algorithm to generate coefficients of a transfer function based on the received signal;

means for shaping the received signal using the transfer function in order to generate a shaped signal;

means for mixing the shaped signal and a template signal to generate a mixed signal; and

means for integrating the mixed signal to generate an integrated signal.

25. The receiver of claim 24, further comprising:

means for demodulating the integrated signal to extract at least a portion of modulated data on the integrated signal.

26. The receive of claim 24, further comprising:

means for generating a template signal to be mixed with the received signal.