Method of performing synchronization and frequency offset estimation using isi considered reference signal and receiver performing the same

A receiver device comprising:

• a calculator configured to,
• receive an input signal through a wireless channel,
• perform a frequency compensation operation on the input signal based on a reference signal to generate a compensated input signal, the reference signal corresponding to an access code associated with the input signal, and
• calculate a symbol error of the input signal by comparing the reference signal with the compensated input signal;
• and
• a detector configured to determine a synchronization timing and a frequency offset for the input signal based on the symbol error of the input signal.

A method of performing synchronization and frequency offset estimation for an input signal, the method comprising:

• generating a reference signal based on an access code, the reference signal obtained by reflecting inter-symbol interference (ISI) characteristics;
• receiving an input signal through a wireless channel, the input signal modulated by a Gaussian frequency shift keying (GFSK) scheme;
• calculating a frequency error of the input signal based on the reference signal;
• performing a frequency compensation operation on the input signal based on the frequency error of the input signal;
• calculating a symbol error of the input signal by comparing the input signal with the reference signal;
• and
• determining a synchronization timing and a frequency offset for the input signal based on the symbol error of the input signal,
• wherein generating the reference signal includes:
• analyzing patterns of a plurality of symbols included in the access code;
• calculating ISI components of the access code based on the patterns of the plurality of symbols;
• and
• obtaining the reference signal including the ISI components,
• wherein calculating the frequency error of the input signal and performing the frequency compensation operation are performed in real-time while receiving the input signal,
• wherein determining the synchronization timing and the frequency offset for the input signal includes:
• comparing the symbol error of the input signal with a threshold value;
• and
• comparing the symbol error of the input signal with a minimum error, and
• wherein the synchronization timing and frequency offset are updated when the symbol error of the input signal is greater than the threshold value and when the symbol error of the input signal is smaller than the minimum error.