Pilot Pattern Design for Channel Estimation in Notched Multi-Carrier Systems

The patent applies preliminary action by proactively placing additional pilot signals in frequency carriers adjacent to notched regions before data transmission occurs. This advance preparation ensures that when frequency notching is applied to avoid interference, the channel estimation can still proceed reliably using the pre-positioned pilot signals that are not affected by the notching.

The patent applies local quality by concentrating additional pilot signals specifically in the frequency carriers adjacent to notched regions, rather than uniformly distributing pilots across all frequencies. This localized enhancement of pilot signal density addresses the specific problem area where channel estimation reliability would otherwise deteriorate due to notching, without unnecessarily increasing pilots in regions that don't require them.

The patent applies local quality by strategically placing additional pilot signals only in the specific frequency carriers adjacent to notched regions where they are most needed for channel estimation, rather than adding pilots uniformly across the entire frequency spectrum. This localized approach minimizes the impact on data transmission capacity while maximizing the benefit to channel estimation reliability in the critical notched regions.

The patent applies partial action by adding pilot signals only to the extent necessary to maintain channel estimation reliability in adjacent regions, rather than adding pilots to all frequency carriers. This partial enhancement provides sufficient pilot coverage for accurate channel estimation without excessively reducing the number of frequency carriers available for data transmission.