  In a frequency division duplex (FDD) massive multiple input multiple output
(MIMO) system, the channel state information (CSI) feedback causes a
significant bandwidth resource occupation. In order to save the uplink
bandwidth resources, a 1-bit compressed sensing (CS)-based CSI feedback method
assisted by superimposed coding (SC) is proposed. Using 1-bit CS and SC
techniques, the compressed support-set information and downlink CSI (DL-CSI)
are superimposed on the uplink user data sequence (UL-US) and fed back to base
station (BS). Compared with the SC-based feedback, the analysis and simulation
results show that the UL-US's bit error ratio (BER) and the DL-CSI's accuracy
can be improved in the proposed method, without using the exclusive uplink
bandwidth resources to feed DL-CSI back to BS.
