METHOD FOR IMPROVED TIMING AND FREQUENCY OFFSET ESTIMATION IN A DIGITAL RADIO RECEIVER
Original Publication Date: 1997-Jun-01
Included in the Prior Art Database: 2002-May-27
In a wireless digital communication system, a digital radio receiver may derive several demodu- lation parameters directly from the received signal. For example a symbol timing estimate is computed to determine the optimal received symbol sampling or decimation point and a frequency offset estimate is computed to enable the demodulator to compen- sate for receiver oscillator inaccuracies and Doppler shifts. In a typical digital receiver for a system such as the Personal Access Communication System (PACS), the received signal is oversampled and an entire slot of samples is stored until timing and frequency estimates have been calculated for that slot. This "block processing" approach enables the receiver to acquire and demodulate slots immediately, as is required for signaling bursts in many commu- nication systems.