Patent ID: 8037335
Filing Date: 2011-10-11
Classification: H04J

Abstract:
1. A channel card for synchronizing a Digital Signal Processing (DSP) modem and a system clock in a mobile communication system, comprising: the DSP modem for sending a reference signal, informing of a start of a transmission, to a Field-Programmable Gate Array (FPGA) modem; and the FPGA modem for comparing a reception time of the reference signal with a Global Positioning System (GPS) timer, for recording a GPS timer value corresponding to a start point based on the comparison, and for sending to the DSP modem the recorded GPS timer value corresponding to the start point at a preset GPS timer reference time, wherein the FPGA modem comprises a GPS timer for receiving system clock information from a GPS part and for recording the GPS timer value corresponding to a start point at the reception time of the reference signal, and for sending the GPS timer value corresponding to the start point to the DSP modem at the preset GPS timer reference time, and wherein the I/O matching part delays the traffic data output from the DSP modem by one sample writing time of a Dual-Port Random Access Memory (DPRAM) and then outputs the traffic data from the DPRAM.