Ultra-wideband communication apparatus and methods

• US 7,317,756 B2
• Filed: 11/10/2004
• Issued: 01/08/2008
• Est. Priority Date: 12/06/2001
• Status: Expired due to Fees

• Current Assignee: Intellectual Ventures Holding 73 LLC (Intellectual Ventures LLC)
• Original Assignee: Pulse-Link Incorporated
• Inventors: Lakkis, Ismail
• Primary Examiner(s): Tran, Khanh C.
• Assistant Examiner(s): AHN, SAM K
• Application Number:
  US10/985,861
• Publication Number:
  US 20050069021A1
• Time in Patent Office: 1,154 Days
• Field of Search: 375/130, 375/142, 375/143, 375/150, 375/152, 375/229, 375/230, 375/232, 375/233, 375/234, 375/239, 375/343, 375/231, 333/18, 342/189, 342/378, 381/103, 379/340, 379/398, 708/5, 708/314, 708/422, 708/813, 708/322, 708/323, 714/751, 714/752, 714/786
• US Class Current: 375/229
• CPC Class Codes: H04B 1/71637 Receiver aspects H04B1/7183 takes precedence
• CPC Class Codes: H04B 1/7176 Data mapping, e.g. modulation
• CPC Class Codes: H04B 1/7183 Synchronisation
• CPC Class Codes: H04B 1/719 Interference-related aspects
• CPC Class Codes: H04L 1/0618 Space-time coding
• CPC Class Codes: H04L 2025/03414 Multicarrier
• CPC Class Codes: H04L 2025/03426 transmission using multiple-input and multiple-output channels
• CPC Class Codes: H04L 25/03057 with a recursive structure H04L25/03031 takes precedence
• CPC Class Codes: H04L 25/03146 with a recursive structure H04L25/03127 takes precedence
• CPC Class Codes: H04L 25/03159 operating in the frequency domain H04L25/03165, H04L25/03178 take precedence
• CPC Class Codes: H04L 25/03866 using scrambling
• CPC Class Codes: H04L 27/0004 using wavelets
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0037 Inter-user or inter-terminal allocation
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling

Abstract

Apparatus and methods of ultra-wideband (UWB) communication are provided. In one embodiment, an ultra-wideband receiver receives a serial data stream comprising a plurality of ultra-wideband pulses. A serial to parallel converter then converts the serial data stream into a plurality of parallel data streams, which are then matched. A combiner then combines the data streams, which are then fed to an equalizer that includes a hard decision element, a past decision element and a future decision element. This Abstract is provided for the sole purpose of complying with the Abstract requirement rules that allow a reader to quickly ascertain the subject matter of the disclosure contained herein. This Abstract is submitted with the explicit understanding that it will not be used to interpret or to limit the scope or the meaning of the claims.

Claims

1. An ultra-wideband communication method, the method comprising the steps of:

transmitting a serial data stream comprising a plurality of ultra-wideband pulses;

receiving the serial data stream;

splitting the serial data stream into a plurality of parallel data streams;

shifting a frequency of at least one of the plurality of parallel data streams;

combining the plurality of parallel data streams into a combined data stream; and

equalizing the combined data stream, wherein the step of equalizing employs an equalizer that comprises;

a hard decision element configured to generate a hard decision estimate of an input sample;

a past decision element configured to multiply at least one past decision estimate with an associated coefficient;

a future decision element configured to multiply at least one future decision estimate with an associated coefficient; and

further comprising a forward error correction element communicating with the equalizer, wherein the hard decision estimate is fed to the forward error correction element;

wherein the future decision element is fed by the forward error correction element.

2. The method of claim 1, wherein the hard decision estimate is fed to the past decision element during a first iteration.

3. The method of claim 1, wherein the past decision element is fed by the future decision element during a second iteration.

4. The method of claim 1, wherein an output of the past decision element is subtracted from an input of the hard decision element during a first iteration.

5. The method of claim 1, wherein an output of the future decision element is combined with an output of the past decision block, and wherein at least one combined output is subtracted from an input of the hard decision element during a second iteration.

6. The method of claim 1, wherein the forward error correction element is configured to detect at least one error in the hard decision estimate, and wherein the forward error correction block is further configured to feed data back to the future decision element if errors are detected.

7. The method of claim 1, wherein each of the ultra-wideband pulses range in duration from about 10 picoseconds to about one microsecond.

8. The method of claim 1, wherein each ultra-wideband pulse occupies at least 500 megahertz of a radio frequency spectrum.

9. An ultra-wideband receiver, comprising;

a receiver structured to receive a serial data stream comprising a plurality of ultra-wideband pulses;

a serial to parallel converter configured to receive the serial data stream and convert the serial data stream into a plurality of parallel data streams;

a plurality of matched filters communicating with the serial to parallel converter, the plurality of matched filters configured to match each of the parallel data streams;

a combiner configured to combine the matched parallel data streams; and

an equalizer comprising;

a hard decision element configured to generate a hard decision estimate of an input sample;

a past decision element configured to multiply at least one past decision estimate with an associated coefficient;

a future decision element configured to multiply at least one future decision estimate with an associated coefficient; and

further comprising a forward error correction element communicating with the equalizer, wherein the hard decision estimate is fed to the forward error correction element;

wherein the future decision element is fed by the forward error correction element.

10. The ultra-wideband receiver of claim 9, wherein the hard decision estimate is fed to the past decision element during a first iteration.

11. The ultra-wideband receiver of claim 9, wherein the past decision element is fed by the future decision element during a second iteration.

12. The ultra-wideband receiver of claim 9, wherein an output of the past decision element is subtracted from an input of the hard decision element during a first iteration.

13. The ultra-wideband receiver of claim 9, wherein an output of the future decision element is combined with an output of the past decision block, and wherein at least one combined output is subtracted from an input of the hard decision element during a second iteration.

14. The ultra-wideband receiver of claim 9, wherein the forward error correction element is configured to detect at least one error in the hard decision estimate, and wherein the forward error correction element is further configured to feed data back to the future decision element if errors are detected.

15. The ultra-wideband receiver of claim 9, wherein each of the ultra-wideband pulses range in duration from about 10 picoseconds to about one microsecond.

16. The ultra-wideband receiver of claim 9, wherein each ultra-wideband pulse occupies at least 500 megahertz of a radio frequency spectrum.