Telefonaktiebolaget LM Ericsson (publ)
Communication node and method for generating multicarrier signals by backscattering

Abstract:

A wireless communication node (300) and method therein for generating multicarrier signals by means of backscattering in a wireless communication system (100) are disclosed. The wireless communication node (300) comprises a plurality A of antennas (310) configured to receive a radio frequency. The wireless communication node (300) further comprises a plurality A of switches (320), each switch has a number M of states. The wireless communication node (300) further comprises a number of impedance matrices (330), each impedance matrix comprising a number M of impedances (Z1, Z2 . . . ), each antenna is coupled to one of the impedance matrices (330) by one of the plurality A switches (320). The wireless communication node (300) further comprises a symbol mapper, a serial to parallel converter and one or more modulators (340) configured to generate a number A of baseband subcarrier signals based on data symbols (342) to be transmitted. The wireless communication node (300) further comprises one or more switch controller (350) configured to control the states of the plurality A of switches (320) based on the generated baseband subcarrier signals such that each antenna impedance is selected among the number M of impedances (330), and thereby the received RF signal at each antenna is modulated by its specific frequency baseband subcarrier signal. A group of RF subcarrier signals is generated by reflecting the modulated RF signal from each antenna, and thereby the multicarrier signals are generated from the plurality A of antennas (310).