This work proposes a novel radio architecture that can take care of out of band (OOB) emissions and allow interference free full duplex radio operation using appropriate nonlinear interference cancellation schemes. We propose that nonlinear operation and the resulting spectral re-growth can be handled without incurring any extra analog hardware in the RF front-end. This is accomplished at the cost of extra base band DSP workload.
In radio receivers employing diversity reception, receiver LO frequencies are closely separated. Different LO frequencies can couple through the substrate to the nonlinear components in the phase locked loops thus generating spurs. Such a spur, if it falls nearby the local transmit frequency, can inadvertently demodulate the strong local transmit signal and hence degrade the received SNR severely. In this paper, we investigate a novel method of compensating for transmitter selfjamming by carefully mimicking this mechanism in the received signal path and thus allowing cancellation. It has been shown that with certain simplifying assumptions one can realistically cancel the spur-induced transmit self-jamming interference. We outline the theoretical feasibility of this approach and then setup an RF test-bench to demonstrate these ideas on actual RF chipsets. Performance results from prototype measurements are reported.
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