Title :
Non-Orthogonal Multiple Access in Downlink Coordinated Two-Point Systems
Author_Institution :
Sch. of Inf. & Commun., Gwangju Inst. of Sci. & Technol. (GIST), Gwangju, South Korea
Abstract :
In order to improve the spectral efficiency, non-orthogonal multiple access (NOMA) with superposition coding is employed in a coordinated system where downlink signals to users near to base stations (BSs) and cell-edge users are transmitted simultaneously. To support a cell-edge user in a NOMA channel, two coordinated BSs use Alamouti code. In order to see the performance, we derive expressions for the transmission rates to near and cell-edge users. It is shown that the proposed coordinated superposition coding (CSC) scheme can provide a reasonable transmission rate to a cell-edge user without degrading the rates to users near to BSs.
Keywords :
encoding; interference suppression; multi-access systems; base stations; cell-edge users; coordinated superposition coding; downlink coordinated two-point systems; nonorthogonal multiple access; spectral efficiency; Array signal processing; Downlink; Encoding; Interference; Signal to noise ratio; Silicon carbide; Wireless communication; Coordinated multipoint (CoMP); interference cancellation; superposition coding;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2013.123113.132450
