Pseudonoise Signalling for Power Line Carrier Applications

Direct sequence pseudonoise (PN) modulation for power line communications is examined, to overcome narrowband impairments and to provide other operational advantages. Design issues considered include code synchronization means, processing gain optimization, PN code selection, modem impedance level, operating frequency band, and data rates and protocols for various applications. Measurements using a prototype modem on distribution lines show bit-error rates below 10-4 at data rates up to 9600 bits/s.