Signal Processing, Software and Codes

Question 1

What is a SDR?

Answer 1

Software Defined Radio.

Question 2

What does the DSP not do in a modern DSP radio?

Answer 2

Control SWR.

Question 3

Which statement best describes the code used for GMDSS-DSC transmissions?

Answer 3

A 10 bit error correcting code starting with bits of data followed by a 3 bit error correcting code.

Question 4

Which is the code used for SITOR-A and -B transmissions?

Answer 4

Each character consists of 7 bits with 4 “zeros” and 3 “ones”

Question 5

Which of the following statements is true?
•The Idle Signal (b) (0011001) is used for FEC Phasing Signal 2.
•The Control Signal 1 (0101100) is used to determine the time displacement in SITOR-B.
•The Idle Signal (a) (0000111) is used for FEC Phasing Signal 1.
•The Signal Repetition character (1001100) is used as a control signal in
SITOR-ARQ.

Answer 5

The Idle Signal (a) (0000111) is used for FEC Phasing Signal 1

Question 6

What principle allows multiple conversations to be able to share one radio channel on a GSM channel?

Answer 6

Time Division Multiplex.