H ELECTRICITY
H04 ELECTRIC COMMUNICATION TECHNIQUE
H04L TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
H04L5/00 Arrangements affording multiple use of the transmission path
H04L5/003 Arrangements for allocating sub-channels of the transmission path
H04L5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
H04L5/005 of common pilots, i.e. pilots destined for multiple users or terminals