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4 papers · 1 filter
Optimizing User Association and Spectrum Allocation in HetNets: A Utility Perspective
Yicheng Lin, Wei Bao, Wei Yu +1
The joint user association and spectrum allocation problem is studied for multi-tier heterogeneous networks (HetNets) in both downlink and uplink in the interference-limited regime…
SCMA Codebook Design
Mahmoud Taherzadeh, Hosein Nikopour, Alireza Bayesteh +1
Multicarrier CDMA is a multiple access scheme in which modulated QAM symbols are spread over OFDMA tones by using a generally complex spreading sequence. Effectively, a QAM symbol…
Uplink Contention Based SCMA for 5G Radio Access
Kelvin Au, Liqing Zhang, Hosein Nikopour +5
Fifth generation (5G) wireless networks are expected to support very diverse applications and terminals. Massive connectivity with a large number of devices is an important require…
SCMA for Downlink Multiple Access of 5G Wireless Networks
Hosein Nikopour, Eric Yi, Alireza Bayesteh +4
Sparse code multiple access (SCMA) is a new frequency domain non-orthogonal multiple-access technique which can improve spectral efficiency of wireless radio access. With SCMA, dif…