A High Data-Rate Energy-Efficient Triple-Channel UWB-Based Cognitive Radio

Abstract

This paper presents a fully integrated ultra wideband (UWB)-based cognitive radio (CR) transceiver for $1\,{\text{Gb/s}}$ data-rate energy-efficient short-range wireless connectivity by scavenging triple discrete inactive frequency bands in 3.1–10.6 $\,{\text{GHz}}$ ISM band. The transceiver including receivers (RXs), transmitters (TXs), spectrum sensors, and synthesizers is implemented in $1\,{\text{V}}$ $65\,{\text{nm}}$ standard CMOS technology. A novel pulse generator (PG) enables the TX to meet UWB emission mask and to reduce spectral sidelobe peak by ${ with low power consumption of $3.6\,{\text{mW}}$ . A dual-mode RX front-end provides quadrature analog correlation (QAC) for analog domain matched filtering during communication and analog wavelet-based energy detection (ED) during spectrum sensing (SS) without changing circuitry. The transceiver achieves the minimum energy consumption of $59.7\,{\text{pJ/b}}$ with $1.97 \times {10}^{-4}\,{\text{bit error rate (BER)}}$ and the maximum energy consumption of $102.3\,{\text{pJ/b}}$ with $1.25 \times {10}^{-3}\,{\text{BER}}$ . Die area is $4.6\,{{\text{mm}}^{2}}$ with on-die phase-locked loops (PLLs) and pads.