A communication management resource implements an iterative process to derive settings for digital precoder W, analog precoder A, and decode function D with a bandwidth-limited fronthaul link between the application of digital precoder W and the application of analog precoder A. The iterative process includes: for a first instance of digital precoder W and decode function D, optimize an instance of the analog precoder A; and based on the optimized instance of the analog precoder A, optimize a second instance of the digital precoder W and the decode function D. In one implementation, for each iteration of multiple iterations, the communication management resource: i) optimizes an instance of the analog precoder A based on an instance of the digital precoder W and the decode function D, and ii) optimizes an instance of the digital precoder W and the decode function D based on the instance of the analog precoder A.

A radiofrequency device operates in a reader mode, in a tag detection mode, and in a card emulation mode. The device includes a first mixer, a second mixer, a gain controllable amplifier and a third mixer. In the reader and tag detection modes, the first mixer mixes a received radiofrequency signal with a first periodic signal having a frequency equal to a frequency of a carrier of the received radiofrequency signal, and the second mixer mixes the received radiofrequency signal with a second periodic signal having a frequency equal to the frequency of the carrier and being in quadrature with first periodic signal. In the card emulation mode, the gain controllable amplifier amplifies the received radiofrequency signal, and the third mixer mixes the amplified signal with itself.

A transmitter includes a modulator, a compensator, an up-converter, and a feedback path. The modulator generates a modulated signal at an intermediate frequency (f.sub.IF) including an in-phase component and a quadrature component. The compensator generates a local oscillator feedthrough (LOFT) and in-phase and quadrature mismatch (IQM) compensated signal at f.sub.IF based on the modulated signal and feedback. The up-converter generates a transmit signal at a transmit frequency (f.sub.TX) based on the LOFT and IQM compensated signal. The feedback path generates the feedback based on the transmit signal. The feedback path includes a quadrature bandpass analog-to-digital converter (ADC) to measure LOFT and IQM in the transmit signal.