公开(公告)号：JP2001267937A

公开(公告)日：2001-09-28

申请号：JP2001033291

申请日：2001-02-09

Applicant: MOTOROLA INC

Inventor： CLASSON BRIAN K ,  TERRY M SCHAFFNER ,  VIPURU A DESAI ,  JAMES C BAKER ,  DANIEL M FRIEND

IPC: G06F11/10 ,  H03M13/23 ,  H03M13/41 ,  H03M13/45

Abstract: PROBLEM TO BE SOLVED: To provide a soft decision output decoder for convolution coding that decodes a signal expressed in a grating with a block length N divided into windows with a length of L. SOLUTION: The decoding of a signal expressed in a grating with a block length N divided into windows having a length of L includes a step (206) where reverse recursions from a point P after the last window to the last window are reversely decoded and a point is selected for the point P at a distance sufficiently apart from the last window so that the reverse recursions decides a known state metric at the last window. The decoding also includes a step (208) where the signal is expressed in the window from the known state in the last window until the start point of the window reversely by using the reverse recursions to decide a reverse recursion state metric set to be stored, a step where a known state in the first window is decoded until the last point of the window forwardly by using the forward recursions, and a step (212) where a soft output in each stage of the forward recursions is calculated by using the reverse recursion state metric to be stored and a branch metric in each stage to provide the soft output of each stage.

公开(公告)号：JPH1093444A

公开(公告)日：1998-04-10

申请号：JP15781097

申请日：1997-05-29

Applicant: MOTOROLA INC

Inventor： JAMES C BAKER

IPC: H03H17/00 ,  H03G7/00 ,  H03G11/00 ,  H03M7/50 ,  H04B14/04

Abstract: PROBLEM TO BE SOLVED: To reduce the number of gate counters, a silicon areas and current consumption at a circuit by using the bit serial digital expander of specific constitution obtained by adding a bit serial scaler, etc., to a basic unit block. SOLUTION: In this bit serial expander, after scaling an input signal through the use of the scaler 243, the gain branch of the expander transfers receives and delivers a signal through a rectifier 120, a low-pass filter 150 and a scaler 260. At an upper branch, a scaler 247 additionally scales the signal from the scaler 243. The outputs of the scaler 247 and a scaler 260 are multiplied together by using a mltiplier 180. At the time of detecting the overflow of the input of a low frequency and high shift, the signal from the scaler 247 bypasses the multiplier 180 by using a multiplexer switch 285.