Energy based multi-signal transmission

This paper presents a bandwidth-efficient transmission scheme where several signals are sent simultaneously. To allow users´ differentiation at the receiver (s), each user data sequence is first multiplied by a specific amplitude sequence prior to being sent through the channel. In addition, the proposed scheme uses error correcting codes and soft-decision demodulation to reduce residual multi-user interference and channel noise at the receiver. Simulation results show that the considered scheme allows achieving spectral efficiencies of several bits per channel use. Finally, we discuss trade-offs between required resources (bandwidth, SNR) to transmit the signals and the BER performance of the proposed scheme.