USER SELECTION IN COMMUNICATIONS

摘要

A method for scheduling user terminals in a communications system comprises approximating, in a network apparatus, a null space projection by using a series of independent projections over terminals in a transmission set; obtaining, by using the approximated null space projection, a vertical displacement of a channel vector from a subspace formed by the terminals in the transmission set. A channel vector of a terminal is used to obtain a unit vector in the same direction. The unit vector is stacked to form a matrix U. A projection gain is obtained, and the obtained projection gain is subtracted from a channel norm to obtain a vertical displacement of the unit vector. The obtained vertical displacement is multiplied to achieve an equivalent null space projection metric. The achieved equivalent null space projection metric is used to select the terminals for the transmission set.