Patent ID: 6639990
Filing Date: 2003-10-28
Classification: H04R

Abstract:
An apparatus, comprising:an antenna for receiving an uplink signal during a receive period and for transmitting a downlink signal during a transmit period; and processing circuitry operably connected to the antenna, said processing circuitry processing the uplink signal to generate the downlink signal, the processing circuitry having an input port and an output port and further comprising: a delay element, said delay element causing a predetermined delay of the transmit period from the receive period so that the downlink signal is transmitted during the transmit period without interference from the uplink signal, and a modulator for modulating the uplink signal to generate the downlink signal, wherein an uplink signal carrier frequency is equivalent to a downlink signal carrier frequency, no unmodulated portion of the uplink signal is required for transmission of the downlink signal, and no radio frequency generating means is included in the apparatus.