System and method for passing data frames in a wireless network

• US 7,724,783 B2
• Filed: 02/27/2004
• Issued: 05/25/2010
• Est. Priority Date: 02/28/2003
• Status: Expired due to Fees

• Current Assignee: North Star Innovations Inc. (Wi-LAN Inc.)
• Original Assignee: Freescale Semiconductor, Inc. (NXP Semiconductors NV)
• Inventors: Shvodian, William M., Roberts, Richard D., Macias, Adrian R., Welborn, Matthew L., Runkle, Paul R., Joseph, Deepak M., Miller, Timothy R., McCorkle, John W., Price, Douglas E.
• Primary Examiner(s): Ryman, Daniel J
• Assistant Examiner(s): Crutchfield, Christopher
• Application Number:
  US10/546,752
• Publication Number:
  US 20060187909A1
• Time in Patent Office: 2,279 Days
• Field of Search: None
• US Class Current: 370/515
• CPC Class Codes: H04B 1/71637 Receiver aspects H04B1/7183 takes precedence
• CPC Class Codes: H04B 1/7183 Synchronisation
• CPC Class Codes: H04B 7/2678 Time synchronisation
• CPC Class Codes: H04L 2025/03375 Passband transmission
• CPC Class Codes: H04L 2025/0349 as a feedback filter
• CPC Class Codes: H04W 56/00 Synchronisation arrangements

Abstract

A method is provided for receiving a data frame in an ultrawide bandwidth network. In this method, a device receives an ultrawide bandwidth signal containing a data frame. The device then performs an acquisition operation during a first preamble in the data frame, and identifies a marker after the first preamble that indicates that the first preamble has ended. After this, the device performs a signal processing operation during a second preamble in the data frame. After the training, the device then receives a header in the data frame, and then receives a payload in the data frame. By having a marker between the two preambles, this method provides a receiving device with critical information regarding the timing of the preamble section of a frame.

Claims

1. A method of receiving a data frame in an ultrawide bandwidth network, comprising:

receiving an ultrawide bandwidth signal containing a data frame;

performing an acquisition operation during a first preamble in the data frame;

identifying a marker after the first preamble that indicates that the first preamble has ended;

performing a signal processing operation during a second preamble in the data frame, after identifying the marker;

performing an automatic gain control operation on the received ultrawide bandwidth signal during the second preamble, after identifying the marker;

receiving a header in the data frame, after performing the signal processing operation and after performing the automatic gain control operation; and

receiving a payload in the data frame, after receiving the header.

2. A method of receiving a data frame in an ultrawide bandwidth network, as recited in claim 1, wherein the signal processing step is a signal training step.

3. A method of receiving a data frame in an ultrawide bandwidth network, as recited in claim 1, implemented in an ultrawide bandwidth transceiver.

4. A method of receiving a data frame in an ultrawide bandwidth network, as recited in claim 1, implemented in an integrated circuit.

5. A method of receiving a data frame in an ultrawide bandwidth network, as recited in claim 1, further comprising performing a pseudo-noise lock on the received ultrawide bandwidth signal during the second preamble, after identifying the marker and before receiving the header.

6. A method of receiving a data frame in an ultrawide bandwidth network, as recited in claim 1, further comprising changing a received data rate for the incoming ultrawide bandwidth signal from a first data rate to a second data rate after performing the acquisition operation and before receiving the payload.

7. A method of receiving a data frame in an ultrawide bandwidth network, as recited in claim 6, wherein the changing of the received data rate is performed during one of:

after receiving the marker and before performing the signal processing operation, after performing the signal processing operation and before receiving the header, and after receiving the header and before receiving the payload.

8. A method of receiving a data frame in an ultrawide bandwidth network, as recited in claim 1, further comprising changing a receiving code word set for the incoming ultrawide bandwidth signal from a first code word set to a second code word set after performing the acquisition operation and before receiving the payload.

9. A method of receiving a data frame in an ultrawide bandwidth network, as recited in claim 8, wherein the changing of the receiving code word set is performed during one of:

after receiving the marker and before performing the signal processing operation, after performing the signal processing operation and before receiving the header, and after receiving the header and before receiving the payload.

10. A method of receiving a data frame in an ultrawide bandwidth network, as recited in claim 1, wherein identifying the marker further comprises:

receiving a plurality of bits;

comparing the plurality of bits with a stored bit sequence; and

identifying the marker as having been received when the plurality of received bits match the stored bit sequence with no more than an allowable number of bit differences between corresponding received bits and stored bits.

11. A method of receiving a data frame in an ultrawide bandwidth network, as recited in claim 10, wherein the allowable number of bit differences is between 0 and 10.

12. A method of receiving a data frame in an ultrawide bandwidth network, as recited in claim 1,

wherein the marker is a sequence of N bits, N being an integer greater than 1, and

wherein the sequence of N bits does not appear in either the first preamble or the second preamble.

13. A receiver in an ultrawide bandwidth network, comprising:

a code processor configured to receive an ultrawide bandwidth signal containing a data frame;

an acquisition detector configured to perform an acquisition operation during a first preamble in the data frame;

a marker detector configured to identify a marker after the first preamble that indicates that the first preamble has ended;

a decision feedback equalizer circuit configured to perform a receiver training operation during a second preamble in the data frame, after identifying the marker; and

an automatic gain control circuit configured to perform an automatic gain control operation on the received ultrawide bandwidth signal during the second preamble, after identifying the marker.

14. A receiver in an ultrawide bandwidth network, as recited in claim 13, wherein the marker detector further comprises:

a shift register of length N for receiving a data stream;

a static register of length N for holding a marker bit value; and

a comparing circuit for comparing the contents of the shift register with the contents of the static register to determine the number of bit errors between corresponding entries in the shift register and the static register,

wherein N is an integer greater than 1.

15. A receiver in an ultrawide bandwidth network, as recited in claim 14, wherein the controller determines that the marker has been detected when the number of bit errors determined by the comparing circuit meets an accepted threshold.