公开(公告)号：CA2097694A1

公开(公告)日：1992-06-21

申请号：CA2097694

申请日：1991-12-17

Applicant: MOTOROLA INC

Inventor： LABEDZ GERALD P ,  KOTZIN MICHAEL D ,  SCHULER JOSEPH J

IPC: H04B1/10 ,  H04B7/005 ,  H04L25/02 ,  H04L25/03 ,  H04L25/30 ,  H04L27/01 ,  H04L27/38

Abstract: 2097694 9211708 PCTABS00014 An equalization system for equalizing a corrupted signal is disclosed. The equalization system includes a complex matched filter (400) and a maximum likelihood sequence estimator (MLSE) (405) for removing the effects of phase shift, amplitude variations, intersymbol interference, etc. resulting from multi-pathing and noise contributed by the receiver front end. The system estimates a correlation signal C(t) (505) and synchronizes C(t) (505) to maximize its energy as seen on the taps of the complex matched filter (400). Taps having amplitude coefficients below a predetermined threshold are set to zero to produce a modified CIR estimate. The modified CIR estimate which has had the effects of noise virtually eliminated, is then used to construct the complex matched filter (400) and is also used as input to the MLSE (405) to produce a better equalized data signal.

公开(公告)号：CS560890A3

公开(公告)日：1992-04-15

申请号：CS560890

申请日：1990-11-13

Applicant: MOTOROLA INC

Inventor： LABEDZ GERALD P ,  ATKINSON FREDERIK G ,  RABE DUANE C ,  SCHULER JOSEPH J ,  WERRONEN ALTON P

IPC: H04B7/08 ,  H04L1/06 ,  H04L1/02

Abstract: A method and apparatus for diversity reception in a communication system is provided. A dual branch receiver (100, 101) is provided with a stored replica of expected reference information (104) so that correlation with received time-dispersed signals produces an estimate of the transmission channel's impulse response as seen by each branch (100, 101), and determines, among other things, phase error between the branch local oscillators (208, 209) and the time-dispersed signals. Matched filters (214, 215) are constructed which then coherently align the time-dispersed signals from each branch (100, 101) with that branch's local oscillator (208, 209) which constitutes a part of the signal equalization. A diversity processor (105) performs bit by bit selection on the re-aligned signals, maximal ratio combining of the re-aligned signals, or equal gain combining of the re-aligned signals, followed by a sequence estimation which uses similarly selected or combined channel distortion compensation parameters to complete the equalization process on the new signal.