Patent ID: 7804884

Claim:
A method for detecting packets in a radio frequency (RF) communication network using orthogonal frequency division multiplexing (OFDM) in a frequency hopping manner, comprising: setting a first RF receiver to receive signals in a first frequency sub-band; setting a second RF receiver to simultaneously receive signals in a second frequency sub-band; checking received signals in the first frequency sub-band to determine if a first known sequence has been received; checking received signals in the second frequency sub-band to determine if a second known sequence has been received; determining if a packet has been received based on receipt of the first known sequence or receipt of the second known sequence; and selecting signals from the first RF receiver and the second RF receiver based on a hopping pattern determined according to a time frequency code after determining that a packet has been received, the time frequency code indicating usage of the first frequency sub-band and the second frequency sub-band over time for transmission of OFDM symbols.