Method and apparatus for computing prefilter coefficients

A method of computing a prefilter, said method comprising:

• estimating a forward channel estimate and a backward channel estimate of a signal received by a receiver;
• determining roots of a z-transform of said forward channel estimate;
• determining roots of a z-transform of said backward channel estimate;
• forming a z-transform of a forward impulse response of said prefilter based on said roots of said z-transform of said forward channel estimate;
• forming a z-transform of a backward impulse response of said prefilter based on said roots of said z-transform of said backward channel estimate;
• computing forward prefilter coefficients of said prefilter based on said z-transform of said forward impulse response of said prefilter;
• and
• computing backward prefilter coefficients of said prefilter based on said z-transform of said backward impulse response of said prefilter.

A method of computing a prefilter, said method comprising:

• estimating a channel estimate of a signal received by a receiver;
• determining roots of a z-transform of said channel estimate;
• forming a z-transform of a forward impulse response of said prefilter based on said roots of said z-transform of said channel estimate having a magnitude greater than one;
• forming a z-transform of a backward impulse response of said prefilter based on said roots of said z-transform of said channel estimate having a magnitude less than or equal to one;
• computing forward prefilter coefficients of said prefilter based on said z-transform of said forward impulse response of said prefilter;
• and
• computing backward prefilter coefficients of said prefilter based on said z-transform of said backward impulse response of said prefilter.

A baseband processor comprising:

• a channel estimator estimating a channel estimate of a received signal;
• a prefilter coefficient generator generating prefilter coefficients in response to said channel estimate received from said channel estimator;
• and
• a prefilter filtering said received signal based on said prefilter coefficients generated by said prefilter coefficient generator;
• wherein said prefilter coefficient generator determines roots of a z-transform of said channel estimate, forms a z-transform of an impulse response of said prefilter based on said roots of said z-transform of said channel estimate, and computes said prefilter coefficients of said prefilter based on said z-transform of said impulse response of said prefilter.

A baseband processor comprising:

• a channel estimator estimating a forward channel estimate and a backward channel estimate of a received signal;
• a prefilter coefficient generator generating forward prefilter coefficients and backward prefilter coefficients in response to said channel estimate received from said channel estimator;
• and
• a prefilter filtering said received signal based on said prefilter coefficients generated by said prefilter coefficient generator;
• wherein said prefilter coefficient generator determines roots of a z-transform of said forward channel estimate, determines roots of a z-transform of said backward channel estimate, forms a z-transform of a forward impulse response of said prefilter based on said roots of said z-transform of said forward channel estimate, forms a z-transform of a backward impulse response of said prefilter based on said roots of said z-transform of said backward channel estimate, computes said forward prefilter coefficients of said prefilter based on said z-transform of said forward impulse response of said prefilter, and computes said backward prefilter coefficients of said prefilter based on said z-transform of said backward impulse response of said prefilter.

A baseband processor comprising:

• a channel estimator estimating a channel estimate of a received signal;
• a prefilter coefficient generator generating forward prefilter coefficients and backward prefilter coefficients in response to said channel estimate received from said channel estimator;
• and
• a prefilter filtering said received signal based on said prefilter coefficients generated by said prefilter coefficient generator;
• wherein said prefilter coefficient generator determines roots of a z-transform of said channel estimate, forms a z-transform of a forward impulse response of said prefilter based on said roots of said z-transform of said channel estimate having a magnitude greater than one, forms a z-transform of a backward impulse response of said prefilter based on said roots of said z-transform of said channel estimate having a magnitude less than or equal to one, computes said forward prefilter coefficients of said prefilter based on said z-transform of said forward impulse response of said prefilter, and computes said backward prefilter coefficients of said prefilter based on said z-transform of said backward impulse response of said prefilter.