[IEEE GLOBECOM 2014 - 2014 IEEE Global Communications Conference - Austin, TX, USA (2014.12.8-2014.12.12)] 2014 IEEE Global Communications Conference - Sparse code multiple access: An energy efficient uplink approach for 5G wireless systemsZhang, Shunqing; Xu, Xiuqiang; Lu, Lei; Wu, Yiqun; He, Gaoning; Chen, Yan · 2014