Accession Number:

AD0735137

Title:

Modulation by Linear Maximal Shift Register Sequences: Amplitude, Biphase and Complement-Phase Modulation

Descriptive Note:

Technical rept.

Corporate Author:

MICHIGAN UNIV ANN ARBOR COOLEY ELECTRONICS LAB

Personal Author(s):

• Birdsall, Theodore G.
• Heitmeyer, Richard M.
• Metzger, Kurt

Report Date:

1971-12-01

Pagination or Media Count:

36.0

Abstract:

The report describes the use of linear-maximal shift-register sequences either to amplitude modulate AM or to angle modulate a sinusoidal carrier. Two cases of angle modulation are considered biphase modulation BM and complement-phase modulation CM. In biphase modulation the carrier angle switches between pi2 and - pi2, whereas in complement-phase modulation the carrier angle switches between pi4 and - pi4. It is shown that the ratio of the average power to the peak power for AM is only one-half as large as for either BM or CM. On the other hand, the ratio of the carrier power to the average power for either AM or CM is one-half, but for BM this ratio is approximately zero. Finally, a replica-correlation technique for use with any of the three modulations is described.

Descriptors:

• *UNDERWATER SOUND
• MODULATION
• SHIFT REGISTERS
• PHASE MODULATION
• AMPLITUDE MODULATION
• POWER SPECTRA
• LOW PASS FILTERS

Subject Categories:

• Cybernetics
• Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE