Due to the Internet of Things (IoT) requirements for a high-density network with low-cost
and low-power physical (PHY) layer design, the low-power budget transceiver systems have drawn
momentous attention lately owing to their superior performance enhancement in both energy
efficiency and hardware complexity reduction. As the power budget of the classical transceivers
is envisioned by using inefficient linear power amplifiers (PAs) at the transmitter (TX) side and by
applying high-resolution analog to digital converters (ADCs) at the receiver (RX) side, the transceiver
architectures with low-cost PHY layer design (i.e., nonlinear PA at the TX and one-bit ADC at the
RX) are mandated to cope with the vast IoT applications. Therefore, in this paper, we propose the
orthogonal shaping pulses minimum shift keying (OSP-MSK) as a multiple-input multiple-output
(MIMO) modulation/demodulation scheme in order to design the low-cost transceiver architectures
associated with the IoT devices. The OSP-MSK fulfills a low-power budget by using constant envelope
modulation (CEM) techniques at the TX side, and by applying a low-resolution one-bit ADC at the
RX side. Furthermore, the OSP-MSK provides a higher spectral efficiency compared to the recently
introduced MIMO-CEM with the one-bit ADC. In this context, the orthogonality between the in-phase
and quadrature-phase components of the OSP are exploited to increase the number of transmitted bits
per symbol (bps) without the need for extra bandwidth. The performance of the proposed scheme is
investigated analytically and via Monte Carlo simulations. For the mathematical analysis, we derive
closed-form expressions for assessing the average bit error rate (ABER) performance of the OSP-MSK
modulation in conjunction with Rayleigh and Nakagami-m fading channels. Moreover, a closed-form
expression for evaluating the power spectral density (PSD) of the proposed scheme is obtained as
well. The simulation results corroborate the potency of the conducted analysis by revealing a high
consistency with the obtained analytical formulas.