Patent ID: 6732326
Filing Date: 2004-05-04
Classification: H03M

Abstract:
A depuncture structure for Radix-4 branch metric calculation in a high-speed Viterbi decoder, comprising:first and second FIFOs (first-input-first-outputs) for sequentially receiving I-signal, and storing the I-signal; third and fourth FIFOs for sequentially receiving Q-signal, and storing the Q-signal; first and second multiplexers for receiving output signals of the first and third FIFOs, and multiplexing them; third and fourth multiplexers for receiving output signals of the second and fourth FIFOs, and multiplexing them; a first Radix-2 branch metric calculator for receiving output signals of the first and second multiplexers, and performing a depuncturing function about them; and a second Radix-2 branch metric calculator for receiving output signals of the third and fourth multiplexers, and performing a depuncturing function about them.