Joint coded caching and distributed storage with product matrix non-systematic code

The coded caching technique and data distribution on multiple servers, known as a distributed storage system (DSS), are two separate concepts that bring various improvements to the communication environment. Combining the two techniques enhances the user network performance by decreasing the peak rate, optimising the user memory and decreasing the latency. This paper investigates the benefits of merging coded caching and distributed storage in various multiserver systems. Hence, we propose a new construction called the non-systematic. This approach considers using a multi-server system consisting of only parity servers and encoded linear combinations of popular file segments based on a predefine non-systematic code in the placement and delivery phases making this concept attractive in terms of security. The proposed concept achieves optimised results regarding the peak rate and the user cache memory and tremendously improves the data security compared to other multi-server systems.