Methods and apparatus for adaptive mimic rejection

Details Methods and apparatus for adaptive mimic rejection Methods and apparatus for adaptive mimic rejection

H - Electricity

04

L

H04L 7/02 (2006.01) H04J 3/06 (2006.01)

Patent

CA 2320540

Methods and apparatus for use in aligning frames in a receiver of a data transmission system include checking one or more bit positions associated with a received data stream to determine a number of bits in the bit positions, respectively, that match a predetermined bit pattern. The number for a bit position is compared to a first threshold value and a second threshold value. A bit position is identified as being associated with a false framing pattern or mimic when the number is not less than the first threshold value. A bit position is identified as a potential framing bit position or possible framing bit position when the number is not less than the second threshold value. The first threshold value is changed when a bit position is identified as a potential framing bit position and another bit position is identified as being associated with a false framing pattern. For example, the first threshold value may be increased by a given value for every frame that a bit position is identified as a potential framing bit position and another bit position is identified as being associated with a false framing pattern. The given value may be a value of one, a value less than one, or a value greater than one. Frame alignment is declared when a bit position is identified as a potential framing bit position and no other bit position is identified as being associated with a false framing pattern.

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