Performance of Maddah-Ali-Niesen Scheme for Multi-Access Coded Caching Over Noisy Channels
Kakumani Sailahari, Anjana A. Mahesh, Charul Rajput, Balaji Sundar Rajan · 2023
Coded caching techniques help to reduce the traffic overload on the server during peak-traffic hours. Most of the existing schemes consider all transmissions to be over noiseless channels, whereas noise is inherent in wireless communication. In this paper, the multi-access coded caching scheme proposed in the paper [“Maddah-Ali-Niesen Scheme for Multi-access Coded Caching,” ITW 2021], is studied when the server-user shared link and all the cache-user links are noisy. This coded caching has been shown to be information-theoretically optimal in [“Fundamental Limits of Combinatorial Multi-Access Caching,” IEEE Transactions on Information Theory, Feb. 2023]. For binary modulated transmissions, the probability that a bit of a requested file is decoded in error at a user is derived when the transmissions are over binary-symmetric, AWGN, and Rayleigh fading channels. Further, the effect of varying the cache access degree (which is the number of caches accessed by each user), and the cache memory size on the probability of bit error performance at a user are also analyzed. Simulation results validating the findings in this paper are also presented.