H ELECTRICITY
H04 ELECTRIC COMMUNICATION TECHNIQUE
H04B TRANSMISSION
H04B1/00 Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
H04B1/10 Means associated with receiver for limiting or suppressing noise or interference
H04B1/1027 assessing signal quality or detecting noise/interference for the received signal