Dual path ghost eliminating equalizer with optimum noise enhancement

A dual path equalizer for processing blocks of data comprising:

• a first pre-processor, wherein the first pre-processor applies coefficients b1 to a received signal;
• a first finite filter, wherein the first finite filter applies coefficients a1 to an output of the first pre-processor in order to substantially eliminate a ghost from the received signal;
• a first post-processor, wherein the first post-processor applies coefficients c1 to an output of the first finite filter;
• a second pre-processor, wherein the second pre-processor applies coefficients b2 to the received signal, and wherein b2≠b1;
• a second finite filter, wherein the second finite filter applies coefficients a2 to an output of the second pre-processor in order to substantially eliminate a ghost from the received signal, and wherein a2≠a1;
• a second post-processor, wherein the second post-processor applies coefficients c2 to an output of the second finite filter, and wherein c1≠c2;
• and,
• an adder arranged to add outputs from the first and second post-processors.

A method of substantially eliminating a ghost of a received main signal and reducing noise enhancement comprising the following steps:

• a) processing the received main signal and the ghost along a first path so as to substantially eliminate the ghost;
• b) processing the received main signal and the ghost along a second path so as to substantially eliminate the ghost, wherein the processing along the first path and the processing along the second path are arranged so as to maintain the received main signal in the first and second paths correlated and to maintain noise in the first and second paths at least partially uncorrelated;
• and,
• c) adding the correlated received main signals and the at least partially uncorrelated noise from the first and second paths.