Apparatus and method for transmitting wireless data using an adaptive frequency selection

A method for transmitting wireless data using an adaptive frequency selection, the method being used in a device which includes a master and a slave and locally transmits wireless data in a frequency-changeable manner, the method comprising the steps of:

• a first step of transmitting and receiving data through a setup channel;
• a second step of checking whether there is channel interference in the setup channel;
• a third step of when the channel interference within a recoverable range occurs in the setup channel, checking whether a replacement channel is stored;
• a fourth step of when the replacement channel is not stored, setting a channel, which has a different frequency from the setup channel, as a temporary replacement channel, and then checking whether there is channel interference while transmitting and receiving data;
• a fifth step of, when there is no channel interference, storing the temporary replacement channel as a replacement channel and then returning to the setup channel;
• a sixth step of checking whether there is interference in the setup channel and the stored replacement channel while alternately transmitting data through the setup channel and the stored replacement channel;
• and
• a seventh step of when there is channel interference in the stored replacement channel, discarding stored replacement channel information and returning to the first step;
• and
• an eighth step of, when interference continuously occurs in the setup channel, transmitting data after changing the stored replacement channel to a new setup channel.

A device for transmitting wireless data through an adaptive frequency selection by using a frequency hopping scheme, the device comprising:

• a transmission data generator for appending at least a redundancy and CRC for error recovery to data to be transmitted, and interleaving and outputting the resulting data;
• an access code generator for appending an access code to the outputted transmission data, and packetizing the resulting data;
• an access code detector for detecting an access code from a received packet;
• a received data restoration unit for checking a CRC in data of the received packet to determine whether an error occurs in the data, and then RS-decoding deinterleaved data to recover a data loss,
• the device further comprising:
• a channel interference detector for comparing the accumulated number of non-identical bits of access codes detected for a predetermined period of time with a prestored threshold value, and detecting from the comparison result whether channel interference occurs;
• a hopping frequency generator for generating random hopping frequencies in response to a device address and a clock inputted thereto;
• and
• a transmission/reception controller for searching channels of the random hopping frequencies for one channel with no interference, storing the searched channel as a replacement channels if channel interference within a recoverable range occurs in the setup channel, and then changing the replacement channel to a new setup channel or searching for a new replacement channel and storing the searched replacement channel if interference is continuously detected by the channel interference detector while alternately transmitting data through the setup channel and the replacement channel.