Ultra wideband communication method with low noise pulse formation

• US 7,697,630 B2
• Filed: 06/12/2008
• Issued: 04/13/2010
• Est. Priority Date: 10/10/2000
• Status: Expired due to Fees

• Current Assignee: North Star Innovations Inc. (Wi-LAN Inc.)
• Original Assignee: Freescale Semiconductor, Inc. (NXP Semiconductors NV)
• Inventors: McCorkle, John W.
• Primary Examiner(s): Ghebretinsae, Temesghen
• Application Number:
  US12/155,948
• Publication Number:
  US 20080247486A1
• Time in Patent Office: 670 Days
• Field of Search: 375/295, 375/286, 375/130, 375/146, 398/183, 329/313
• US Class Current: 375/295
• CPC Class Codes: H04B 1/71632 Signal aspects H04B1/7172 and H04B1/7176 take precedence
• CPC Class Codes: H04B 1/7174 Pulse generation in general H04L25/03834
• CPC Class Codes: H04B 1/719 Interference-related aspects
• CPC Class Codes: H04L 27/0004 using wavelets

Abstract

An ultra-wide band (UWB) waveform encoding method is provided. The method includes receiving a data stream; generating a first encoder signal and a second encoder signal such that if the first and second encoder signals were mixed, the mixing would return a representation of the data stream; generating a sequence of pulses; mixing the first encoder signal with at least a portion of the sequence of pulses, to produce a mixing result; and mixing the second encoder signal with the mixing result, to produce a sequence of ultra wideband wavelets encoded in accordance with the data stream.

Claims

1. A method of encoding an ultra wideband signal, comprising:

receiving a data stream;

generating a first encoder signal and a second encoder signal such that if the first and second encoder signals were mixed, the mixing would return a representation of the data stream;

generating a sequence of pulses;

mixing the first encoder signal with at least a portion of the sequence of pulses, to produce a mixing result; and

mixing the second encoder signal with the mixing result, to produce a sequence of ultra wideband wavelets encoded in accordance with the data stream.

2. The method of claim 1, further comprising:

receiving a whitening sequence from a noise source,

wherein the generating of the first encoder signal and the second encoder signal first encoder signal is generated by multiplying the data stream by the whitening sequence, and

wherein the second encoder signal is the whitening sequence.

3. The method of claim 1, wherein the method operates to suppresses self-noise.

4. The method of claim 1,

wherein the data stream is received at a chipping rate, and

wherein the operation of generating a first encoding encoder further comprises splitting the data stream into a first derivative encoded stream at half the chipping rate as a first signal output and a second derivative encoded stream at half the chipping rate as a second signal output.

5. The method of claim 4, wherein the second derivative encoded stream is 90°

out of phase relative to the first derivative encoded stream.

6. The method of claim 1, wherein the generating of the first encoder signal and the second encoder signal is performed using a de-spur code generator.

7. The method of claim 1, wherein at least one of the mixing of the first encoder signal and the mixing of the second encoder signal is a differential mixing operation.

8. The method of claim 1,

wherein the sequence of pulses comprises a first pulse stream, and a second pulse stream delayed with respect to the first pulse stream by a period corresponding to width of a pulse of the first pulse stream, and

wherein the mixing of the first encoder signal with at least a portion of the sequence of pulses is performed using a differential mixer having a differential input for receiving the first and second pulse streams from a pulse generator.

9. The method of claim 1, wherein the data stream comprises high rate non-return-to-zero data.