NASA NTRS · 19830060178
Rate 3/4 16-PSK phase codes
Abstract
An investigation is carried out of convolutional-coding coupled with 16-PSK modulation for bandwidth efficient transmission. Small memory codes (rate three-fourths) are found that are optimum in the free-distance sense on the Gaussian channel. These codes furnish up to 4.8 dB of coding gain with 32 states over uncoded 8-PSK, a scheme having the same spectral efficiency as the codes described. The performance is compared with the earlier findings of Ungerboeck (1976, 1982) and certain recent results on R = 2/3 coded 8-PSK. It is shown that with 4 decoder states the coding gain is 3.5 dB and with 32 states it is 4.8 dB. What is more, the codes compare favorably with coded 16-QASK when envelope variations and peak energy constraints are considered.
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Wilson, S. G., Schottler, P. J., Sleeper, H. A.. 1982-01-01. Rate 3/4 16-PSK phase codes. https://ntrs.nasa.gov/citations/19830060178
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