Question

The maximal length of PN sequence, the sequence length for n number of shift register is ______

(a) 2^n

(b) 1/2^n

(c) 2^n – 1

(d) 2^n + 1

I had been asked this question in an interview for job.

My doubt stems from Small- Scale Multipath Measurements topic in section Mobile Radio Propagation: Small – Scale Fading and Multipath of Wireless/Mobile

Answer 1

The correct answer is (c) 2^n – 1

Easy explanation: For a maximal length pseudo number (PN) sequence, the sequence length is 2^n – 1. Here, n is the number of shift registers in the sequence register.