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Systems with 1-bit quantization and oversampling are promising for the
Internet of Things (IoT) devices in order to reduce the power consumption of
the analog-to-digital-converters. The novel time-instance zero-crossing (TI ZX)
modulation is a promising approach for this kind of channels but existing
studies rely on optimization problems with high computational complexity and
delay. In this work, we propose a practical waveform design based on the
established TI ZX modulation for a multiuser multi-input multi-output (MIMO)
downlink scenario with 1-bit quantization and temporal oversampling at the
receivers. In this sense, the proposed temporal transmit signals are
constructed by concatenating segments of coefficients which convey the
information into the time-instances of zero-crossings according to the TI ZX
mapping rules. The proposed waveform design is compared with other methods from
the literature. The methods are compared in terms of bit error rate and
normalized power spectral density. Numerical results show that the proposed
technique is suitable for multiuser MIMO system with 1-bit quantization while
tolerating some small amount of out-of-band radiation.
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