Patent ID: 8238319

Claim:
A radio apparatus forming a wireless network established autonomously and performing wireless communication between a source and a destination, the radio apparatus comprising: a spreading unit configured to spread a packet with a prescribed spread code arbitrarily selected from a plurality of spread codes; a channel selecting unit configured to select one channel from a plurality of channels, in response to a request for transmitting said packet; and a transmitting unit configured to transmit a spread spectrum signal spread by said spreading unit, using said one channel, wherein: said channel selecting unit selects a specific channel having relatively low signal interference as said one channel from said plurality of channels in order to avoid the interference, said transmitting unit transmits said spread spectrum signal using said specific channel, and said signal interference is determined by one of the following (i) to (vi): (i) signal level after Fourier transform of the spread spectrum signal subjected to Fast Fourier Transform, (ii) signal level of the spread spectrum signal, (iii) signal level after Fourier transform of the despread signal subjected to Fast Fourier Transform, (iv) signal level of the despread signal, (v) among a plurality of correlated values between the spread spectrum signal and each of the plurality of spread codes, one that is lower than a threshold value, and (vi) among a plurality of correlated values between the signal after Fourier transform of the spread spectrum signal subjected to Fast Fourier Transform and each of the plurality of spread codes, one that is lower than the threshold value.