Scope

This Recommendation describes channel and block arrangements in the portions of the frequency range 130.0‑174.8 GHz allocated to the fixed service. The arrangements are based on a 250 MHz basic channel raster from which N × 250 MHz channel size can be defined and are proposed for either frequency division duplex (FDD) or time division duplex (TDD) applications. Alternative duplex schemes, such as flexible frequency division duplex (fFDD)[1] or full duplex (FD)[2] may also be considered.

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[1] Flexible Frequency Division Duplex (fFDD) systems allow required TX/RX isolation without traditional RF duplex filters, but through separate TX/RX antennas and/or digital cancellation capability, allowing narrower duplex spacing.

[2]   Full Duplex (FD) systems use the same channel for go/return (as TDD systems), but for 100% of the time; they should provide necessary TX/RX isolation through separate TX and RX antennas and digital cancellation, rather than through duplex filter as in conventional FDD systems.