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101.

In ____ antenna, the interface boundary between radio and antenna is blurred.(a) multiple input multiple output(b) single input single output(c) single input multiple output(d) multiple input single outputThis question was addressed to me at a job interview.I need to ask this question from Hardware Architecture in portion Software Defined Radio Architecture of Cognitive Radio

Answer»

The correct choice is (a) multiple input multiple output

Easy explanation: Wide bandwidth, LARGE NUMBER of parallel receivers, and modem signal PROCESSING blur the INTERFACE boundary between radio and ANTENNA in multiple input multiple output antennas.
Discussion
102.

____ is used to optimize voltage standing wave ratio.(a) Antenna-matching unit(b) Radiating element(c) Antenna tuner(d) Power amplifierThis question was addressed to me in examination.My question comes from Hardware Architecture topic in division Software Defined Radio Architecture of Cognitive Radio

Answer» RIGHT choice is (c) ANTENNA tuner

The best explanation: Antennas, operating over a wide frequency range, use antenna tuner to OPTIMIZE the voltage standing wave RATIO. It also results in improvement of radiation EFFICIENCY.
Discussion
103.

The modem controls the antenna matching unit to maximize voltage standing wave ratio.(a) True(b) FalseI got this question in unit test.The question is from Hardware Architecture in division Software Defined Radio Architecture of Cognitive Radio

Answer»

The correct choice is (b) False

For EXPLANATION: Antenna matching unit is a part of RF front end section in transmit mode and in RECEIVE mode. In transmit mode, the modem CONTROLS the antenna matching unit to minimize voltage standing wave RATIO.
Discussion
104.

_____ stream characterizes radio surrounding usage in terms of time, frequency, and space.(a) Online adaption(b) Offline adaption(c) Environment management(d) Real-time channel processingThis question was addressed to me during an interview.The origin of the question is Essential Function of Software Radio in section Software Defined Radio Architecture of Cognitive Radio

Answer»

Correct option is (c) Environment MANAGEMENT

Best explanation: Environment management stream characterizes RADIO surrounding USAGE in terms of TIME, frequency, and space. It also includes channel identification and ESTIMATION of channel interference levels.
Discussion