DECISION FEEDBACK EQUALIZATION WITH PRECURSOR INTER-SYMBOL INTERFERENCE REDUCTION

摘要

In a receiver (100), a decision feedback equalizer (120) provides weighted postcursor decisions (121) to a subtraction block (122) for subtraction from an analog input signal (101) to provide an analog output signal (123). A postcursor decision block (130) compares the analog output signal (123) against positive and negative values (104, 105) of a postcursor coefficient for providing first and second possible decisions (136, 137) for selecting a current postcursor-based decision (116) therebetween responsive to a previous postcursor- based decision (117). A precursor cancellation block (108) receives the analog output signal (123), the previous postcursor-based decision (117) and the current postcursor- based decision (116) for providing a digital output signal (124) for a previous sample of the analog input signal (101). The precursor cancellation block (108) includes comparators (211 -214) for receiving the analog output signal (123) and for respectively receiving threshold inputs (201 -204) different from one another for providing possible digital outputs (215-218) for the analog output signal (123). The selection stage (230) is coupled for receiving the possible digital outputs (215-218) for selection of the digital output signal (124).