MULTICHANNEL M-ARY FREQUENCY-SHIFT-KEYING BLOCK DEMODULATOR IMPLEMENTATION

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Authors
  1. Tom, C.
  2. Meng, Z.
Corporate Authors
Defence Research Establishment Ottawa, Ottawa ONT (CAN)
Abstract
The Military Satellite Communications (MILSATCOM) group at Defence Research Establishment Ottawa (DREO) is performing in-house satellite communications uplink synchronization experiments. A critical part of the experiment is the block demodulation of the multi-channel frequency-hopped waveform. The report analyses the Fast Fourier transform (FFT)-based demodulator implemented by Royal Military College (RMC) Kingston. This system is capable of demodulating a 32 channel, 8-ary frequency-shift-keying (FSK) waveform. The implementation consists of analog-to-digital (A/D) commercial off-the-shelf boards. A description of each of the boards is presented. The operational data flow of the system is examined. For the software implementation, a decimation-in-time approach is used in the digital signal processing (DSP) board to compute the discrete Fourier transform (DFT). A brief description of decimation-in-time algorithms is included. Key components of the assembly language program are outlined. A user's guide detailing the setup requirements for proper operation of the system is included with those required for the DREO application. Steps required for modification to the software are briefly discussed.
Report Number
DREO-1307 — Technical report
Date of publication
01 Nov 1996
Number of Pages
68
DSTKIM No
97-00591
CANDIS No
500767
Format(s):
Hardcopy;Document Image stored on Optical Disk

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