… SCMA codebook design scheme was investigated for downlink SCMA in [14]. A multi-user
codebook design for SCMA systems … as a near-optimal SCMA decoder [5]. It is evident that the …

… code division multiple access (CDMA), multiple users in SCMA are separated by assigning
distinctive sparse codebooks (… enable two or more users to access the finite system resources …

… of an SCMA system: efficient decoding algorithm and optimal codebook design. Although
MPA … However for SCMA, an obvious codebook design criterion and practical optimal decoder …

… Abstract—Sparse Code Multiple Access (SCMA) has been … as a potential candidate for
multiple access techniques of the fifth … with N = 4 and tractable decoding complexity. Since the …

… of the system model and section 4 codebook design, section … codebook design and capacity
based codebook design are … that the performance of capacity based codebook design is …

… In the traditional system, a spherical decoding solution offers a substantially reduced complexity
while compromising very little speed, and SCMA detection may be thought of as a sort of …

… wireless access technique, sparse code multiple access (… Another challenge in SCMA is
the decoding complexity. The … “A capacity-based codebook design method for sparse code …

… Sparse code multiple access (SCMA) is a popular code-… : (1) the multi-dimensional sparse
codebooks offering high shaping … a method to design the codebooks for an SCMA system. The …

… as regards three aspects: codebook design with regard to system reliability; decoding
techniques with regard to decoding complexity; and other research work on system performance …

… In [13], capacity based codebook design is … -free system which requires detection of the
active users. Hence, we develop a joint user activity detection, channel estimation and decoding …