Transceiver Design for Thermal Noise Modulation-Based Downlink MISO Communication Systems

Abstract

The idea of the thermal noise modulation (TherMod) is utilizing two different noise variances to convey bit-0 and bit-1, respectively, which, compared to conventional deterministic carrier based modulation schemes, requires a much lower power consumption. To break through the performance bottleneck of the existing TherMod based single-antenna transmitter, we propose a novel TherMod based multiantenna transmitter framework via fully exploiting the feature of the TherMod. Based on the proposed transmitter model, we formulate a transmitter optimization problem under a mean squared error (MSE) minimization criterion for a downlink single-user multiple-input single-output (MISO) system, which admits a closed-form solution. We also develop a maximum likelihood (ML)-based receiver to achieve reliable data detection, whose theoretical bit error rate (BER) is analyzed. Then, the proposed transmitter model, the MSE-based transmitter, the ML-based receiver, and the BER analysis are extended for a more general and complicated multiuser MISO scenario. In particular, we employ the minorization-maximization (MM) technique to find an efficient solution to the transmitter design problem. Moreover, in order to trade off the transmit power and the communication distance, the proposed solutions are also modified to accommodate the transmitter with low-noise amplifiers (LNAs). Finally, simulation results validate the remarkable superiorities of the proposed multiantenna transmitter designs compared to the single-antenna solution and the benchmark multiantenna solutions.