Adaptive reference pattern for spread spectrum detection claims

• US 5,937,003 A
• Filed: 02/02/1998
• Issued: 08/10/1999
• Est. Priority Date: 12/29/1995
• Status: Expired due to Term

• Current Assignee: Echelon Corporation (Renesas Electronics Corporation)
• Original Assignee: Echelon Corporation (Renesas Electronics Corporation)
• Inventors: Sutterlin, Philip H., Stewart, J. Marcus
• Primary Examiner(s): TSE, YOUNG TOI
• Application Number:
  US09/017,530
• Time in Patent Office: 554 Days
• Field of Search: 375/200, 375/202, 375/206-210, 375/260, 375/343, 375/346, 375/367, 370/320, 370/335, 370/342, 370/515, 364/717.01, 364/717.03, 364/728.03, 364/728.07
• US Class Current: 375/150
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 2203/5408 using protocols
• CPC Class Codes: H04B 3/54 Systems for transmission via power distribution lines
• CPC Class Codes: H04L 1/0001 Systems modifying transmission characteristics according to link quality, e.g. power backoff adaptive data allocation for multicarrier modulation H04L5/0044; controlling transmission power for radio systems H04W52/04
• CPC Class Codes: H04L 7/042 Detectors therefor, e.g. correlators, state machines digital correlators in general G06F17/15

Abstract

A receiver for detecting spread spectrum binary data particularly on a power line in the presence of channel distortion. In one embodiment a standard pattern ideally suited for minimal distortion in the channel is used in conjunction with an alternate pattern which is developed to better detect carrier and data in the presence of certain channel distortion. The receiver switches between the standard and alternate pattern to provide improved detection. In another embodiment an adaptive pattern is used which is developed from the receive signal. For instance, the signal over several bit times is averaged to provide a pattern which is correlated with a receive signal.

Claims

1. In a spread spectrum receiver where a received signal is correlated with a pattern to detect binary data, an improved method comprising the steps of:

using the received signal to develop the pattern; and

,

continually updating the pattern based on the received signal.

2. The method defined by claim 1 wherein sample bits of the received signal are correlated with sample bits from one data bit time earlier.