Enhanced ultra wide band signal detection using an ultra wide band kernel

• US 8,249,128 B2
• Filed: 04/20/2007
• Issued: 08/21/2012
• Est. Priority Date: 04/25/2006
• Status: Active Grant

• Current Assignee: Novatel Incorporated (Hexagon AB)
• Original Assignee: Novatel Incorporated (Hexagon AB)
• Inventors: Kunysz, Waldemar
• Primary Examiner(s): Fotakis, Aristocratis
• Application Number:
  US11/738,175
• Publication Number:
  US 20070248145A1
• Time in Patent Office: 1,950 Days
• Field of Search: 375/138, 375/130, 375/137, 375/295, 375/375, 375/256, 375/142, 375/143, 375/150, 375/152, 375/316, 375/340, 375/343, 455/114.1
• US Class Current: 375/130
• CPC Class Codes: H04B 1/71632 Signal aspects H04B1/7172 and H04B1/7176 take precedence
• CPC Class Codes: H04B 1/7183 Synchronisation

Abstract

A system and method is provided for improving the operating range for UWB communication systems by increasing the margin between true correlation peaks and false correlation peaks in a received UWB signal. A received signal is first correlated with a UWB kernel before being correlated with the PRN code. The UWB kernel is a very short UWB pulse having the same pulse shape as the UWB signal pulses. By pre-correlating the received signal with the UWB kernel at least once prior to correlating with the PRN code, the margin between true correlation peaks and false correlation peaks is substantially improved.

Claims

1. A method comprising:

receiving an ultra wide band (UWB) signal including pseudo-random noise (PRN) encoded information;

correlating the UWB signal with a UWB kernel that consists of a UWB pulse having a pulse shape substantially identical to a pulse shape of a transmitted UWB pulse to generate a pre-correlated signal;

correlating the pre-correlated signal with the UWB kernel for a second time prior to correlating the pre-correlated signal with the PRN code;

correlating the pre-correlated signal with the PRN code to locate UWB pulses in the UWB signal; and

outputting the located UWB pulses.

2. The method of claim 1, comprising:

correlating the pre-correlated signal with the UWB kernel at least a third time prior to correlating the pre-correlated signal with the PRN code.

3. The method of claim 1, wherein the UWB kernel consists of a short duration UWB pulse.

4. The method of claim 1, comprising:

modulating a UWB signal using a PRN code to generate a modulated UWB signal;

communicating the modulated UWB signal to a first UWB antenna for transmission;

receiving the modulated UWB signal by a second UWB antenna.

5. An ultra side band (UWB) communication system comprising:

a UWB receiving antenna;

two pre-correlators connected to the UWB receiving antenna, the pre-correlators configured to correlate a UWB signal received from the UWB receiving antenna with a UWB kernel that consists of UWB pulse having a pulse shape substantially identical to a pulse shape of a transmitted UWB pulse to generate a pre-correlated signal, wherein the two pre-correlators are connected in series and a first pre-correlator correlates the UWB signal received from the UWB receiving antenna with the UWB kernel and the second pre-correlator correlates a signal received from the first pre-correlator with the UWB kernel to generate the pre-correlated signal; and

a correlator connected to the pre-correlators, the correlator configured to correlate the pre-correlated signal with a pseudo-random noise (PRN) code in order to locate the UWB pulses.

6. The UWB communication system of claim 5, further including a third pre-correlator connected in series with the two pre-correlators, wherein the third pre-correlator correlates a signal received from the second pre-correlator with the UWB kernel to generate the pre-correlated signal.

7. The UWB communication system of claim 5, further including n pre-correlators connected in series with the two pre-correlators correlate the pre-correlated signal with the UWB kernel before the pre-correlated signal is provided to the correlator, where n is an integer.

8. The UWB communication system of claim 5, comprising:

UWB modulation circuitry configured to modulate a UWB signal with the PRN code; and

a UWB transmitting antenna connected to the UWB modulation circuitry and transmitting the PRN modulated UWB signal from the UWB transmitting antenna.

9. The UWB communication system of claim 5 wherein the UWB receiving antenna is a dual-sphere antenna.

10. The UWB communication of claim 8 wherein the UWB transmitting antenna is a dual sphere antenna.

11. A method comprising:

receiving an ultra wide band (UWB) signal including modulation code encoded information;

correlating the UWB signal with a UWB kernel that consists of a UWB pulse having a pulse shape substantially identical to a pulse shape of a transmitted UWB pulse to generate a pre-correlated signal;

correlating the pre-correlated signal with the UWB kernel for a second time prior to correlating the pre-correlated signal with the modulation code;

correlating the pre-correlated signal with the modulation code to locate UWB pulses in the UWB signal; and

outputting the located UWB pulses.

12. The method of claim 11, comprising:

correlating the pre-correlated signal with a UWB kernel signal at least a third time prior to correlating the pre-correlated signal with the modulation code.