Adaptive reference pattern for spread spectrum detection claims

• US 6,600,775 B2
• Filed: 08/08/2002
• Issued: 07/29/2003
• 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: Stewart, J. Marcus, Sutterlin, Philip H.
• Primary Examiner(s): CORRIELUS, JEAN B
• Application Number:
  US10/216,314
• Publication Number:
  US 20020191679A1
• Time in Patent Office: 355 Days
• Field of Search: 375/130, 375/140, 375/142, 375/147, 375/150, 375/152, 375/367, 708/422, 708/314
• US Class Current: 375/142
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 2203/5408 using protocols
• CPC Class Codes: H04B 2203/5416 by adding signals to the wave form of the power source
• CPC Class Codes: H04B 2203/5483 using coupling circuits
• 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. A spread spectrum detection apparatus comprising:

a correlator having a plurality of stages coupled to receive an incoming signal which incoming signal has a plurality of sample bits, the correlator providing an output signal for detecting data bits; and

a shift register having a plurality of stages, coupled to receive the incoming signal and coupled to provide an adaptive pattern to the correlator, the adaptive pattern based, at least in part, on the incoming signal using sample bits from more than a single data bit period, such that the adaptive pattern is correlated with the incoming signal within the correlator.

2. The apparatus defined by claim 1, including a plurality of the shift registers for providing the adaptive pattern.

3. A spread spectrum detection apparatus comprising:

a correlator having a plurality of stages coupled to receive an incoming signal, which incoming signal has a plurality of sample bits, the correlator providing an output signal for detecting data bits; and

shift registers each having a plurality of stages, coupled to receive the incoming signal and coupled to provide an adaptive pattern to the correlator, the adaptive pattern based, at least in part, on the incoming signal using sample bits from more than a single data bit period such that the adaptive pattern is correlated with the incoming signal within the correlator.