Optimal Power Allocation in MISO Cache-Aided Communication
Optimal Power Allocation in MISO Cache-Aided Communication
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DOI：
10.1109/spawc.2018.8445770
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发表时间：
2018-06
期刊：
影响因子：
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通讯作者：
S. Mohajer;I. Bergel
中科院分区：
文献类型：
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作者：
S. Mohajer;I. Bergel
研究了多用户、多输入多输出天线、信噪比有限范围蜂窝网络的缓存辅助通信问题。假设用户具有非对称链路，由宽带衰落信道建模。最终目标是设计一个联合的功率、速率和缓存分配以及预取和提取方案，以最小化交付阶段的通信持续时间。将其表述为一个线性规划，并对某些特殊参数范围给出了封闭形式的解。特别是，MIMO编码缓存的增益超出了空间分集和累积缓存大小之间的交易，特别是在低信噪比制度下，每个用户可以以自己的信道速率服务，而不是被通信组中最穷的用户所损害。
The problem of cache-aided communication is studied for cellular networks with multi-user, with multiple-input and multiple output antennas, and finite range of signal-to-noise ratio. Users are assumed to have non-symmetric links, modeled by wideband fading channels. The ultimate goal is to design a joint power, rate, and cache allocation along with pre-fetching and fetching schemes to minimize the duration of communication in the delivery phase. This is formulated as a linear program, and a closed form solution is presented for some special range of parameters. In particular, the gain of MIMO coded caching is shown to be beyond trading between spatial diversity and accumulative cache size, specially in low SNR regime, where each user can be served at its own channel rate, rather than being compromised by the poorest user in the communication group.