Sampled-data multichannel telemetry using pseudorandom sequences
G.K. Aggarwal · Proceedings of the IEEE · 1969
It is pointed out that PR sequences (words) generated by linear shift registers, with n stages, may be used in a reactance modulator to obtain 2n- 1 different carrier frequencies distributed in time in a known but more or less random sequence, each frequency repeating after an interval of 2n- 1.