Abstract
AbstractPhysical layer of cognitive‐wave‐radio receiver is investigated to identify interference signals, by spectrum sensing, in the presence of received QPSK data at 20 Mbps. The investigated cognitive‐wave‐radio receiver structure is based on existing wave radio physical layer (six‐port receiver interferometer) adapted for the receiver data active cancellation. For active cancellation of the received digital data, four outputs of the standard wave radio receiver are used in conjunction with three “single pole double throw” switches providing a single output of the “zero state time interval” for spectrum sensing of the interference signal. Two interference signals were tested: a 7‐dBm amplitude modulated interference and a wide band white noise with 0.01 mW/MHz. The microwave carrier of the QPSK signal is set at an amplitude of 16 dBm and a carrier frequency of 3.5 GHz. Once the interference signal spectrum is identified, the QPSK data are transmitted through the available channel. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:195–200, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25670
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