Method and system for undersampled symbol synchronization

• US 20050180538A1
• Filed: 04/18/2005
• Published: 08/18/2005
• Est. Priority Date: 10/26/2001
• Status: Abandoned Application

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: Karr, Lawrence J.
• Application Number:
  US11/108,925
• Publication Number:
  US 20050180538A1
• Time in Patent Office: Days
• US Class Current: 375/368
• CPC Class Codes: H04H 20/34 using an out-of-band subcarrier signal
• CPC Class Codes: H04H 20/72 of terrestrial networks
• CPC Class Codes: H04H 40/27 specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95
• CPC Class Codes: H04H 60/92 for local area
• CPC Class Codes: H04L 7/041 using special codes as synchronising signal
• CPC Class Codes: H04L 7/043 Pseudo-noise [PN] codes variable during transmission synchronisation of spread spectrum receivers H04B1/69
• CPC Class Codes: H04L 7/06 the synchronisation signals differing from the information signals in amplitude, polarity or frequency or length

Abstract

Described is a system and method for providing a synchronization pattern in a communication system. The method includes generating a synchronization pattern with good randomness properties; packing a signal for transmission with m headers, each header consisting of the synchronization pattern 1/m symbol-time shifted from the previous header; and transmitting the signal. A further method provides for the sampling the transmitted signal with m headers of symbol-time shifted synchronization patterns; and determining symbol timing offset by computing and reordering correlation peaks from the synchronization patterns. A system includes a transmitting system, a receiving system, and a data channel. The transmitted signal includes m headers with 1/m symbol-time shifted synchronization patterns. The receiving system undersamples the transmitted signal with m synchronization patterns to simulate an oversampled synchronization pattern.

Claims

1-27. -27. (canceled)

28. A system for providing a symbol synchronization-offset signal for use in communication systems, comprising:

a transmitting system arranged to provide a signal, wherein the signal includes a plurality of synchronization patterns, wherein each of the plurality of synchronization patterns differ from the other synchronization patterns by a time shift; and

a receiving system that is arranged to provide the symbol synchronization-offset signal, wherein the symbol synchronization-offset is produced by reordering a plurality of correlation peaks determined from the plurality of transmitted synchronization patterns, whereby the receiver symbol synchronization-offset pattern simulates an oversampled synchronization pattern with improved signal to noise ratio over true oversampled receiver samplings.

29. The system of claim 28, wherein the synchronization pattern is at least one of a random sequence, a pseudo random sequence, and a periodic sequence.

30. The system of claim 28, wherein the synchronization pattern further comprises a maximal-length sequence of length 15 generated by a 4-bit linear feedback shift register.

31. A computer-readable medium encoded with a data structure for providing a synchronization pattern for use in a communications system, the data structure comprising a plurality of data fields stored in a plurality of headers of a data packet, wherein each of the plurality of data fields comprises a synchronization pattern, wherein each synchronization pattern differs from the other synchronization pattern by a fractional symbol-time shift.