Perhaps you should try some spelling variations:
nonadaptive signals » adaptive signal
22adaptive signal » adaptive signal
adaptive signals » adaptive signal, adaptive signaling, adaptive single

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: %((((22adaptive signal) OR (adaptive signals))) OR (nonadaptive signals)) processing%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((((22adaptive signal) OR (adaptive signals))) or (nonadaptive signals)) processing%22".
• Adding a wildcard symbol may retrieve word variants: %((((22adaptive signal) OR (adaptive signals))) or (nonadaptive signals)) processing%22*.