System and a method for management of communication subchannels in a wireless communication device

A wireless local area network (WLAN) station (STA) comprising:

• an analog receiving module configured to receive a signal encoding modulated data over a predetermined sub-band;
• a mixer including a filter configured to shift the received signal to a baseband;
• an analog-to-digital converter arranged to convert the signal in the baseband to a digital signal and store the digital signal in a memory;
• a subchannel detection system comprising:
• an input interface configured to receive digital data over a predetermined baseband;
• the baseband being divided into a plurality of subchannels, a plurality of frequency translators, each translator configured to shift spectrum of the digital data within a subchannel to a center of the baseband;
• a plurality of low-pass filters;
• each low-pass filter configured to filter frequencies within a subchannel bandwidth;
• a plurality of correlators;
• each correlator configured to receive a filtered digital signal and correlate the received digital signal to a subchannel size, and a processing module configured to receive data from the plurality of correlators and detect one or more active subchannels,
• wherein the plurality of frequency translators shift spectrum of all subchannels in the digital data received by the input interface to the center of the baseband;
• the shifted spectra are filtered by the plurality of low-pass filters and correlated by the plurality of correlators to individual subchannels;
• and
• a data decoding module arranged to decode the modulated data based on active subchannel information received from the subchannel detection system.