Sub-band selection at cellular base station for non-overlapped or partially overlapped full duplex operation
摘要
說明書
In concert with the RF transmissions, the receiver may be monitored to identify received signals that correlates to the scheduled RF transmissions. The received RF power level and/or a difference between the transmitted and received RF power levels, e.g., in a form of a transfer function, may be characterized by the sub-band selection measurement 220. In many instances, the sub-band selection measurement 220 will demonstrate some variation in self-interference power level across the frequency band. Variations may be monotonic, or more likely, include relative maxima and/or minima across the frequency band as illustrated by the example self-interference curve 221.
Those regions of the example self-interference curve 221 demonstrating relatively low self-interference power levels indicate regions in which a lesser portion of the transmitter power couples into a front end of the receiver. Accordingly, such regions represent opportunities for tuning a transmitter, such that a relatively lower portion of the transmitted RF signal couples into the receiver. This takes advantage of a natural isolation as may be provided by one or more of the transceiver architecture, a local environment and/or other operational parameters. In the illustrative example, a minimum value occurs at a frequency fx. A local transmitter may be tuned at or near fx, such that when powered, it presents a transmitted spectrum 222 that occurs in a region of low coupling. Beneficially, a spacing of the transmitter at or near fx results in a relatively low self-interference power level. It is envisioned that in at least some instances, there may be more than one regions demonstrating relatively low self-interference power that may serve as alternative locations for tuning the transmitter, and/or for accommodating multiple transmitters operating within the same band.
