Abstract: Polarization-switched quadrature phase-shift keying (PS-QPSK) is a recently introduced 4-D signal constellation that has a power efficiency (and sensitivity) advantage over ...

Abstract: A novel method to produce direct QPSK modulation is presented. The key feature of the architecture is the absence of mixers and as a result unwanted mixing products. Bandwidth limitations of ...

Satellite communications (satcom) offer ubiquitous service coverage from space, albeit with limited bandwidth. As a result, service providers seek to use higher-order modulation schemes to achieve ...

In the context of next-generation optical access networks beyond 10 G, for high SE and flexible dynamic bandwidth allocation (DBA), the scheme of hybrid 64/16/4QAM-OFDM signal for downlink ...

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