Patent ID: 7277411

Claim:
A TDMA frequency hopping system, comprising: a transmitter configurable to allocate at least two time slots for transmitting identical data packets, and to transmit said identical data packets in the at least two time slots at different frequencies, and a receiver configurable to receive in at least two time slots data packets transmitted at different frequencies, and to select one of the data packets based on reception quality; said receiver comprising: a channel filter responsively coupled to a TDMA controller for filtering an incoming signal comprising multiple data packets each received in a respective TDMA slot and superimposed on a carrier signal having a respective frequency a demodulator coupled to the channel filter for demodulating the filtered incoming signal to as to produce each of the data packets received in successive TDMA slots, and a data recovery unit coupled to the demodulator for concatenating the demodulated data packets received in successive TDMA time slots so as to recover the transmitted signal; said channel filter comprising: a frequency synthesizer responsive to a hop counter for producing for each TDMA slot a carrier frequency that is identical to the carrier frequency used by the transmitter to transmit data during the respective TDMA slot, a TDMA controller synchronized to the transmitter for generating said hop counter so that successive TDMA time slots are decoded in proper time and frequency synchronism with the transmitter, and a mixer for mixing the carrier frequency produced by the frequency synthesizer with the incoming signal containing multiple frequency signals, transmitted at different carrier signals so as to produce an intermediate signal having a predetermined frequency.