Ultra wideband communication system, method and device with low noise reception

• US 7,505,538 B2
• Filed: 01/31/2005
• Issued: 03/17/2009
• 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): Corrielus, Jean B
• Application Number:
  US11/045,373
• Publication Number:
  US 20050129153A1
• Time in Patent Office: 1,506 Days
• Field of Search: 375/130, 375/144, 375/148, 375/259, 375/265, 375/346, 375/333, 375/350, 375/348, 455/130, 455/296, 455/63, 455/313
• US Class Current: 375/346
• CPC Class Codes: H04B 1/71637 Receiver aspects H04B1/7183 takes precedence
• CPC Class Codes: H04B 1/719 Interference-related aspects
• CPC Class Codes: H04L 27/0004 using wavelets

Abstract

An ultra-wide band (UWB) waveform receiver with noise cancellation for use in a UWB digital communication system. The UWB receiver uses a two-stage mixing approach to cancel noise and bias in the receiver. Self-jamming is prevented by inverting a portion of the received signal in the first mixer and then coherently detecting the partially and synchronously inverted signal in the second mixer. Since the drive signals on both mixers are not matched to the desired signal, leakage of either drive signal does not jam the desired signal preventing the receiver from detecting and decoding a weak signal.

Claims

1. An ultra wideband receiver, comprising:

a self-noise suppression means for receiving incoming ultra wideband wavelets, and for suppressing noise generated by the receiver by using a noise suppression code to generate noise-suppressed ultra wideband wavelets;

a detection waveform generation means coupled to the self-noise suppression means for receiving the noise-suppressed ultra wideband wavelets and locally generated ultra wideband wavelets and generating a detection waveform having encoded therein a transmitted data source,

wherein the noise suppression code is the same length as a transmit code used to encode the incoming ultra wideband wavelets,

wherein the noise suppression code differs in value from the transmit code, and

wherein the noise suppression code is not an inverse value of the transmit code.

2. The ultra wideband receiver of claim 1, further comprising:

an integrator having an input and an output, the input being coupled to the detection waveform generation means, wherein

a signal output by the integrator is used to provide a decoded output signal.

3. The ultra wideband receiver of claim 1, further comprising:

a DC bias blocking means for blocking a DC bias component of signals output by the self-noise suppression means.

4. The ultra wideband receiver of claim 2, further comprising:

recovery means configured to receive the signal output by the integrator and a recovery code, and to generate the decoded output signal.

5. A two-stage ultra wideband receiving circuit, comprising:

a first stage configured to mix a signal received at an antenna with a noise suppression code and generate an intermediate signal;

a second stage configured to mix the intermediate signal with a wavelet to generate an output signal;

an integrator configured to receive and decode the output signal to provide a decoded signal; and

a third stage configured to mix the decoded signal with a recovery code to generate a recovered signal,

wherein the noise suppression code is the same length as a transmit code used to encode the received signal,

wherein the noise suppression code differs in value from the transmit code, and

wherein the noise suppression code is not an inverse value of the transmit code.

6. The two-stage ultra wideband receiving circuit of claim 5, wherein the integrator integrates the output signal separately over two or more portions of the output signal to provide the decoded signal.

7. The two-stage ultra wideband receiving circuit of claim 5, further comprising a DC bias blocking circuit formed between the first stage and the second stage and configured to block a DC bias component of the intermediate signal.

8. The two-stage ultra wideband receiving circuit of claim 5, wherein the noise suppression code is a non-return-to-zero code.

9. The two-stage ultra wideband receiving circuit of claim 5, wherein the signal received at the antenna is amplified before being provided to the first stage.

10. The two-stage ultra wideband receiving circuit of claim 5, wherein the signal received at the antenna is filtered before being provided to the first stage.