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Multi-input multi-output constant envelope modulation (MIMO-CEM) is considered as a promising low power PHY layer design for emerging Internet of Things (IoT) smart devices. MIMO-CEM efficiently overwhelms the high power consumption in MIMO-OFDM transmit signal comes from its high peak-to-average power ratio (PAPR). Despite its high efficiency in reducing the power consumption in the radio frequency (RF) band, MIMO-CEM suffers from high computational complexity in the digital signal processing performed by the receiver, e.g., MIMO decoding and channel estimation. This comes from the 1-bit analog to digital converter (ADC) operating in the intermediate frequency (IF) band used at the receiver side. In this paper, a low complexity sphere decoder (SD) is proposed for MIMO-CEM. A low complexity baseband modeling of MIMO-CEM based on an affine linear transformation is used to specify the …