Method of transmitting wireless variable AV according to channel environment
Disclosed is method of transmitting wireless variable AV according to channel environment, the AV format, code rate, and modulation index based on the lookup table according to the data rate. The modulation index, AV format, code rate, and output level may be adjusted step by step based on an SNR and/or a BER to provide a high quality image according to a channel environment.
1. A method of transmitting wireless variable AV from a source device to a display device according to a channel environment comprising steps of:
preparing a lookup table (LUT) comprising an AV format, a code rate, and a modulation index according to a data rate;
setting a modulation index based on an SNR;
setting an AV format;
adjusting a code rate;
adjusting an output level, and
changing an AV format according to a channel environment,
wherein the channel environment is measured with an SNR and a BER, and
when the channel environment is improved above the SNR limit or below the BER limit, the code rate and modulation index are adjusted upward, and the AV format is changed to increase the data rate and to control the output level.
2. A method of transmitting wireless variable AV from a source device to a display device according to a channel environment comprising steps of:
preparing a lookup table (LUT) comprising an AV format, a code rate, and a modulation index according to a data rate;
setting a modulation index based on an SNR;
setting an AV format;
adjusting a code rate;
adjusting an output level, and
changing an AV format according to a channel environment,
wherein the channel environment is measured with an SNR and a BER, and
when the channel environment deteriorates below the SNR limit or above the BER limit, the AV format is change to reduce the data rate, adjust the code rate and output level, and adjust the modulation index downward to reach the maximum value.
3. The method of claim 1 , only when the channel environment is maintained for a certain time, the AV format, modulation index, code rate, and output level are adjusted upward.
4. The method of claim 2 , when the channel environment changes, the AV format, modulation index, code rate, and output level are immediately adjusted.
5. The method according to claim 1 , when the AV format and the modulation index is adjusted up or down, the code rate or output level is adjusted to the maximum, and then the AV format and modulation index is adjusted up or down.