Abstract: A system and method are provided for non-causal channel equalization in a communications system. The method comprises: establishing three thresholds; receiving a binary serial data stream; comparing the first bit estimate in the data stream to a second bit value received prior to the first bit; comparing the first bit estimate to a third bit value received subsequent to the first bit; data stream inputs below the first threshold and above the third threshold are a “0” if both the second and third bits are “1” values, and as a “1” if either of the second and third values is a “1”; data stream inputs above the second threshold and below the third threshold are a “1” if both the second and third bits are a “0” value, and as a “0” if either of the second and third values is a “0”.

Abstract: A system and method are provided for non-causal channel equalization in a communications system. The method comprises: establishing three thresholds; receiving a binary serial data stream; comparing the first bit estimate in the data stream to a second bit value received prior to the first bit; comparing the first bit estimate to a third bit value received subsequent to the first bit; data stream inputs below the first threshold and above the third threshold are a “0” if both the second and third bits are “1” values, and as a “1” if either of the second and third values is a “1”; data stream inputs above the second threshold and below the third threshold are a “1” if both the second and third bits are a “0” value, and as a “0” if either of the second and third values is a “0”.

Abstract: A modified gain system and method are provided for non-causal channel equalization using feed-forward and feedback compensation. The method comprises: receiving a serial data stream first bit (present) input; comparing a second bit (past) value, received prior to the first bit input, to a third bit (future) value received subsequent to the first bit input; modifying the amplitude of the first bit input to compensate for the effect of the second and third bit values being equal; and, determining the value of the first bit input by comparing the amplitude modified first bit input to a Vopt threshold. When only one of the second and third bit values is a “1” value, a unity amplitude modifier is supplied. When the second and third bit values are a “1”, a low amplitude modifier is supplied. When the second and third bit values are a “0”, a high amplitude modifier is supplied.

Abstract: A system and method are provided for non-causal channel equalization in a communications system. The method comprises: establishing three thresholds; receiving a binary serial data stream; comparing the first bit estimate in the data stream to a second bit value received prior to the first bit; comparing the first bit estimate to a third bit value received subsequent to the first bit; data stream inputs below the first threshold and above the third threshold are a “0” if both the second and third bits are “1” values, and as a “1” if either of the second and third values is a “1”; data stream inputs above the second threshold and below the third threshold are a “1” if both the second and third bits are a “0” value, and as a “0” if either of the second and third values is a “0”.

Abstract: A state machine method and system are provided for determining non-causal channel equalization thresholds. The method comprises: receiving a non-return to zero (NRZ) data stream encoded with forward error correction (FEC); setting x=0; in State 0, adjusting a third threshold (Vopt) in response to corrected bit errors; if x=0, setting a first and second threshold equal to the third threshold; in State 1, if x=0, simultaneously adjusting the first threshold and the second threshold, to minimize the total number of corrected bit errors; in State 2, following State 0, adjusting the first threshold, independent of the second threshold, to minimize the total number of errors; in State 3, following State 0, adjusting the second threshold, independent of the first threshold, to minimize the total number of errors; and, adding 1 to x and returning to State 0.

Abstract: A system and method is provided for using phase adjustment in non-causal channel equalization in a communications system. The method comprising: receiving a serial data stream input; comparing a bit value in the serial data stream determined at a first phase with respect to a clock, to a bit value determined at a second phase; determining the optimal phase for the determination of bit values; and, using the optimal phase to determine subsequently received bit values. Typically, the serial data stream is encoded with forward error correction (FEC). Then, the method further comprises: FEC decoding the bit values determined at a plurality of phases. Determining the optimal phase for the determination of bit values includes calculating an error rate associated with the phases and, defining the optimal phase as the phase associated with a low error rate.

Abstract: A system and a method are provided for non-causal channel equalization using error statistics. The method comprises: receiving a non-return to zero (NRZ) data stream input encoded with forward error correction (FEC); establishing a plurality of thresholds to generate a first bit estimate; comparing the first bit estimate in the data stream to a second bit value received prior to the first bit; comparing the first bit estimate to a third bit value received subsequent to the first bit; in response to the comparisons, determining the value of the first bit; FEC decoding the determined first bit value; and, using FEC error statistics to adjust the thresholds by evaluating the number of errors associated with a plurality of three-bit sequence combinations.