One embodiment of the present invention includes a circuit and a transmitter. The circuit generates a first signal at a first frequency and a second signal at a second frequency. The first frequency is provided by a first frequency-hopping sequence such that the first and second frequencies are non-colliding. The transmitter transmits the first and second signals in a radio frequency (RF) band simultaneously within a transmission period. Another embodiment of the invention includes a receiver and a circuit. The receiver receives simultaneously a first signal at a first frequency and a second signal at a second frequency in a radio frequency (RF) band. The first frequency is provided by a first frequency-hopping sequence such that the first and second frequencies are non-colliding. The circuit demodulates the first and second signals into first and second data streams, respectively.