However, when one common relay for two users is used (a Multiple Access Relay Channel MARC), it can be proven that the maximum achievable coding rate yielding full diversity is [12].
Most of the recent work on this problem has been focused on approaches based on the separation of source and channel coding, which rely on using distributed source coding (DSC [2] to first generate independent bit streams from two sources and then to use a multiple-access method (such as TDMA, FDMA, or CDMA)[3] to convert a multiple-access channel (MAC) into a set of orthogonal channels.
Data transmission between main and cooperating nodes can be performed either via broadcast transmission (all nodes receive all data), or using a given multiple access scheme; this aspect, which is related to intra-VAA communication, is out of the scope of this paper.
The rate for any given user can be computed from this using the multiple access rates as given in Section 5.
Nevertheless, even in such cases, spatial multiplexing of user streams may be applied in multiuser systems by way of using a spatial domain multiple access (SDMA) scheme.
It utilizes a broader spectrum, using multiple access technologies, new deployment schemes (e.g., ultra-dense heterogeneous deployment), and advanced waveforms combined with novel coding and modulation algorithms.
Therefore, in this paper, we propose and demonstrate a VLC technology using time-division multiple access (TDMA) optical beamforming to accommodate multiple user devices, which focuses LED light on each different target device in each different time slot.
Authors in [94] present a F-RAN architecture using non-orthogonal multiple access (NOMA) [95], which can effectively leverage C-RAN's advantages.
Previous related studies in[9 11] proposed a tight upper bound on the coverage of flooding in a multi-hop network using carrier sense multiple access (CSMA) as the MAC layer strategy for any finite network size.
Ericsson will buy the Qualcomm unit that makes mobile equipment using code division multiple access, and Qualcomm will take a charge connected with the sale.
