Subpacketization-Rate Trade-Off in Multi-Antenna Coded Caching
Subpacketization-Rate Trade-Off in Multi-Antenna Coded Caching
复制标题
多天线编码缓存中的分包率权衡
DOI：
10.1109/globecom38437.2019.9013280
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发表时间：
2019
期刊：
影响因子：
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通讯作者：
Jarkko Kaleva
中科院分区：
文献类型：
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作者：
M. Salehi;Antti Tölli;S. P. Shariatpanahi;Jarkko Kaleva
编码高速缓存可以通过向仔细选择的用户组多播波束成形编码数据块并使用用户高速缓存中的现有文件片段来解码每个用户处的期望文件而应用于无线多天线通信中。然而，一个文件应该被分割成的数据包的数量（称为子包化）随着网络规模呈指数级增长。我们提供了一种新的方案，它使子分组化的水平，根据基本的网络参数，如天线和用户数之间的一组预定义的值自由选择。一个简单的效率指数也提出了在不同的子分组化水平的性能指标。数值例子表明，较大的子分组通常会导致更好的效率指数和更高的对称速率，而较小的子分组会导致可达速率的显着损失。这实现了更高效的缓存方案，适合于可用的计算和功率资源。
Coded caching can be applied in wireless multi- antenna communications by multicast beamforming coded data chunks to carefully selected user groups and using the existing file fragments in user caches to decode the desired files at each user. However, the number of packets a file should be split into, known as subpacketization, grows exponentially with the network size. We provide a new scheme, which enables the level of subpacketization to be selected freely among a set of predefined values depending on basic network parameters such as antenna and user count. A simple efficiency index is also proposed as a performance indicator at various subpacketization levels. The numerical examples demonstrate that larger subpacketization generally results in better efficiency index and higher symmetric rate, while smaller subpacketization incurs significant loss in the achievable rate. This enables more efficient caching schemes, tailored to the available computational and power resources.