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

摘要

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 (+ pi/2) and (- pi/2), whereas in complement-phase modulation the carrier angle switches between (+ pi/4) and (- pi/4). 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. (Author)