Antenna Selection for Non-orthogonal Multiple Access with Space Time Block Codes

Non-orthogonal multiple access (NOMA) has drawn much attention since the resources for wireless communications are getting scarce with the rapid growth of data traffic and multiple services. To enlarge the capacity and combat the multi-path fading, the technique of multiple-input multiple-out (MIMO) is introduced into NOMA system. However, the superior performance comes at the price of expensive RF chains. Moreover, the computational complexity of AS should not be neglected. To this end, a novel AS algorithm is proposed to approach exhaustive search with less complexity. Furthermore, the general STBC design is introduced in MIMO-NOMA system, and the performances are evaluated in terms of the sum rate and outage probability.