Modem performing modulation or demodulation based on length of burst in data packet, and method performed by the modem
AssigneeElectronics and Telecommunications Research Institute
InventorsPansoo Kim, Deock Gil Oh
Life of this patent
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Abstract
Disclosed is a demodulation method to be used by an apparatus receiving a data packet transmitted in wired and wireless communications to recover data from a received signal. The apparatus receiving the data packet may recover or synchronize a symbol timing that is used to recover the data, and a demodulator included in the apparatus receiving the data packet may determine the symbol timing through different methods based on a length of a burst included in the data packet.
Claims11
A demodulation method performed by a demodulator to demodulate an analog signal, the demodulation method comprising:
- converting the analog signal to a digital signal;
- identifying a type of a burst included in the digital signal;
- and
- determining a sampling clock to be used to sample the analog signal based on the identified type of the burst,
- wherein determining the sampling clock comprises:
- determining a symbol timing to be used to determine the sampling clock based on the identified type of the burst or a length of the burst;
- in response to the length of the burst being less than or equal to a preset threshold, calculating a correlation between the digital signal and a preset symbol pattern;
- obtaining a time-domain complex signal vector corresponding to the digital signal by combining calculated correlations;
- and
- determining a power distribution of the digital signal to be used to determine the sampling clock, based on the obtained complex signal vector.
A modulation method performed by a modulator, the modulation method comprising:
- determining a length of a burst to be transmitted to a demodulator corresponding to the modulator based on a length of payload data;
- comparing the determined length of the burst to a preset threshold and a timeslot;
- determining a length of at least one of a preamble, a pilot field, or a postamble that is associated with the burst, based on a result of comparing the length of the burst to the preset threshold and the timeslot;
- and
- modulating the payload data to generate the burst based on the determined length of the at least one of the preamble, the pilot field, or the postamble.
A demodulation method performed by a demodulator to demodulate an analog signal, the demodulation method comprising:
- converting the analog signal to a digital signal;
- identifying a length of a burst included in the digital signal;
- determining a symbol timing of the analog signal using the digital signal based on the identified length of the burst, determining the symbol timing comprising:
- selecting, based on the identified length of the burst, either a first process that uses a symbol pattern or a second process that uses a nonlinear operation, and
- determining the symbol timing the selected;
- and
- demodulating the digital signal based on the determined symbol timing.
Dependencies are inferred from the claim text.