Patent ID: 7664210
Filing Date: 2010-02-16
Classification: H04B,H04L

Abstract:
1. A non-coherent synchronous direct-conversion receiving apparatus comprising: an RF receiving means for performing a filtering operation and a low-noise amplifying operation on a signal received through an antenna, demodulating the amplified signal to a baseband I/Q signals according to a reference clock in a direct-conversion scheme, and performing a low-pass filtering operation on the demodulated signal; an I/Q analog-to-digital converting means for converting the I/Q signals received from the RF receiving means to a digital signal; and a digital signal processing means for analyzing the digital signal received from the I/O analog-to-digital converting means to adjust a bandwidth of a variable receiving filtering unit according to the analyzing result, compensating a frequency offset to be correspondent with a symbol transmitting rate by extracting frequency offset information from the digital signal, compensating a frequency offset by using the analyzing result, and applying a voltage corresponding to a sum of compensating values to the RF receiving means, so as to compensate the frequency offset.