Software Defined Radio Architecture Questions and Answers for Aptitude test on “Essential Function of Software Radio”.
1. Which of the following is not a part of the channel encoder/decoder section in the functional model of software defined radio?
a) RF/Channel access
b) Source coding
c) IF processing
d) Modem
Answer: b
Clarification: The channel encoder/decoder section comprises of RF/Channel access, IF processing, and modem. RF/Channel access includes antenna and RF conversion. IF processing stage includes filtering, and frequency translation. Modem is responsible for waveform definition.
2. ____ may include digital beam forming.
a) Modem
b) ADCs
c) Channel access
d) IF processing
Answer: d
Clarification: IF processing may include filtering, frequency translation, digital beam forming, joint space time equalization, integration of space diversity and frequency diversity.
3. ____ connects sources that are physically remote from the radio node.
a) INFOSEC
b) RF/Channel access
c) Network support
d) Communication services
Answer: c
Clarification: The sources, which are physically remote from the radio node, are connected via Synchronous Digital Hierarchy, Local Area Network or other networks to the radio node by service and network support.
4. Joint control may grow towards autonomous selection of ____ and ____
a) band, mode
b) band, personality
c) mode, personality
d) personality, protocol
Answer: a
Clarification: Joint control may grow towards autonomous selection of band, mode, and data format. Joint control guarantees system stability, error recovery, and isochronous streaming of voice and video.
5. _____ is essential to ensure that the required resources do not exceed the available resources of a radio platform.
a) Joint control
b) Host processor
c) Host controller
d) Evolution support
Answer: d
Clarification: Evolution support is essential to ensure that the required resources do not exceed the available resources of a radio platform. It monitors the definition and download process of waveform personalities. It also verifies whether a personality is safe for activation.
6. ____ ensures data integrity.
a) INFOSEC
b) TRANSEC
c) Network support
d) Source coding
Answer: a
Clarification: Information security operations such as authentication and stream enciphering ensure data integrity. Further, authentication reduces fraud and stream enciphering assures privacy.
7. ____ device allows inclusion of new hardware components without external physical intervention.
a) Configurable
b) Plug and Play
c) DSP
d) ASIC
Answer: b
Clarification: Plug and Play device facilitate the inclusion of hardware components without physical configuration or external user intervention. A challenge posed by plug and play modules is the definition of interface points.
8. Which of the following is not characteristic of a plug and play module?
a) Compatibility
b) Configurability
c) Controllability
d) Predictability
Answer: b
Clarification: The plug and play module must be compatible with radio environment. It must be controllable under defined module and have predictive usage of resources.
9. ____ must preserve radio service-defining properties of the system.
a) Module control
b) Module composition
c) Joint control
d) Joint composition
Answer: b
Clarification: Module composition must preserve radio service-defining properties of the system. It prevents erroneous results from being generated on control commands. It also ensures proper consumption of computational resources.
10. Digital translation of a baseband signal into an IF is an example for ____
a) continuous-time point operation
b) continuous-frequency point operation
c) discrete-time point operation
d) discrete-frequency point operation