Cache-Aided Interference Management with Subexponential Subpacketization

Consider an interference channel consisting of K_T transmitters and K_R receivers with AWGN noise and complex channel gains, and with N files in the system. The one-shot DoF for this channel is the maximum number of receivers which can be served simultaneously with vanishing probability of error as the SNR grows large, under a class of schemes known as one-shot schemes. Consider that there exists transmitter and receiver side caches which can store fractions M_T/N and M_R/N of the library respectively. Recent work for this cache-aided interference channel setup shows that, using a carefully designed prefetching(caching) phase, and a one-shot coded delivery scheme combined with a proper choice of beamforming coefficients at the transmitters, we can achieve a DoF of t_T+t_R, where t_T=M_T K_T/N and t_R=M_R K_R/N, which was shown to be almost optimal. The existing scheme involves splitting the file into F subfiles (the parameter F is called the subpacketization), where F can be extremely large (in fact, with constant cache fractions, it becomes exponential in K_R, for large K_R). In this work, our first contribution is a scheme which achieves the same DoF of t_T+t_R with a smaller subpacketization than prior schemes. Our second contribution is a new coded caching scheme for the interference channel based on projective geometries over finite fields which achieves a one-shot DoF of Θ(log_qK_R+K_T), with a subpacketization F=q^O(K_T+(log_qK_R)^2) (for some prime power q) that is subexponential in K_R, for small constant cache fraction at the receivers. To the best of our knowledge, this is the first coded caching scheme with subpacketization subexponential in the number of receivers for this setting.


Energy-Efficiency Gains of Caching for Interference Channels

This paper initiates the study of energy-efficiency gains provided by ca...

Wyner's Network on Caches: Combining Receiver Caching with a Flexible Backhaul

In this work, we study a large linear interference network with an equal...

Device-to-Device Aided Multicasting

We consider a device-to-device (D2D) aided multicast channel, where a tr...

Physical-Layer Schemes for Wireless Coded Caching

We investigate the potentials of applying the coded caching paradigm in ...

Multicast Beamformer Design for MIMO Coded Caching Systems

Coded caching (CC) techniques have been shown to be conveniently applica...

Centralized and Decentralized Cache-Aided Interference Management in Heterogeneous Parallel Channels

We consider the problem of cache-aided interference management in a netw...

Please sign up or login with your details

Forgot password? Click here to reset