Spectrum sharing using power split between primary and secondary transmitters

摘要

A wireless spectrum is shared between a primary communication system and secondary communication system operating in an overlapping geographical region. A primary transmitter broadcasts a primary signal, and a secondary transmitter transmits a secondary signal, both using a primary wireless spectrum assigned to the primary communication system. The secondary transmitter transmits the secondary signal to a secondary receiver with power (1−α)P and transmits the primary signal with power αP. The parameter α is computed to ensure a predetermined quality of reception of the primary signal by a hypothetical primary receiver located near the secondary transmitter. The secondary transmitter may compute a feasibility of using cognitive transmission and, when the computed feasibility exceeds or does not exceed a feasibility threshold, it selects to enable or disable, respectively, the use of the primary wireless spectrum to transmit from the secondary transmitter.

主权项

1. A method for wireless spectrum sharing, the method comprising:
broadcasting a primary signal from a primary transmitter using a primary wireless spectrum assigned to a primary communication system; transmitting a secondary signal from a secondary transmitter to a secondary receiver using the primary wireless spectrum assigned to the primary communication system, wherein the secondary transmitter and the secondary receiver belong to a secondary communication system to which no wireless spectrum is assigned, or to which a secondary wireless spectrum is assigned, wherein the secondary wireless spectrum is distinct from the primary wireless spectrum; wherein transmitting the secondary signal from the secondary transmitter comprises transmitting with a total power P split between power αP used by the secondary transmitter to transmit the primary signal, whereby the primary signal broadcasted by the primary transmitter is amplified, and power (1−α)P used by the secondary transmitter to transmit the secondary signal to the secondary receiver; wherein α is computed by the secondary transmitter to protect the primary signal from quality of service degradation caused by the secondary signal by selecting α such that the power (1−α)P of the secondary signal ensures that an SINR of the primary signal received by a hypothetical primary receiver located near the secondary transmitter exceeds a predetermined SINR threshold.