Patent ID: 7653404

Claim:
An analyzer device for analyzing the condition of radio waves employed in wireless data communication in a wireless local area network (LAN) involving exchange of data by a spread spectrum communication technique on a selected channel among a plurality of channels with overlapping frequency bands, said analyzer device comprising: receiving unit that receives radio signals in said plurality of overlapping frequency bands; first strength sensing unit that senses field strength of the center frequency band of said plurality of frequency bands on a per-channel basis from a said received radio signal; despreading unit that despreads said received radio signal to generate despread radio signals; second strength sensing unit that senses field strength of the center frequency band on a per-channel basis from said despread radio signal; and discriminating unit that discriminates radio wave condition for each channel by effectively comparing, on a per-channel basis, field strength of the center frequency band of said received radio signals sensed by said first strength sensing unit to a first value and effectively comparing field strength of the center frequency band of the despread radio signals sensed by said second strength sensing unit to a second value in order to discriminate among the following conditions: a condition of being suitable for use by said wireless data communication in the wireless LAN when (i) the field strength of the center frequency band of said received radio signals is less than the first value and (ii) the field strength of the center frequency band of the despread radio signals is less than the second value, and when the field strengths of the center frequencies of said received and despread signals are not both respectively less than the first and second values: a condition of being currently in use by said wireless data communication in the wireless LAN when (i) the field strength of the center frequency band of the despread radio signals is greater or equal to the second value; and a condition of being unsuitable for use by said wireless data communication in the wireless LAN when the field strength of the center frequency band of the despread radio signals is less than the second value.