Error-correcting Code Performance in a Modeled ECM Environment.
Abstract
Electronic countermeasures (ECM), such as broadband, switched broadband, continuous wave and multitone jamming, are designed to disrupt communication systems. The subject of this thesis is the effect of these ECM on the performance of error correcting codes in an additive Gaussian noise channel. The channel is modeled with two convolutional coders having a rate of 1/2 and constraint lengths of 2 and 6, an 8-ary FSK modulator and demodulator, and a decoder based upon the Viterbi algorithm. Two measures of effectiveness are the probability of bit errors P(b)(e) for the waveform channel and the bit error rate (BER) for the overall channel performance. It is shown that both P(b)(e) and BER are increased by the previously mentioned ECM. To aid in evaluating the performance of these coders, a simulation program was written. In the program, the transmission signal, the channel noise, and the jamming signal are independent of each other. the basic conclusions for these two convolutional codes are that the dual-three encoder with the longer codeword performs better in the no jamming or in a Gaussian jamming environment, while the CC1 encoder with the shorter codeword performs better in a CW jamming environment. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1980
- Accession Number
- ADA100795
Entities
People
- Dennis James Rensel
Organizations
- Air Force Institute of Technology