Increasing capacity of multi-cell cooperative cellular networks with nested deployment

This paper proposes a novel deployment for multi-cell cooperative cellular networks based on the two-dimensional (2D) nested co-array, and analyzes its sum-rate capacity and spectrum efficiency. The system model is based on the traditional hexagonal cellular array, in which each hexagon represents a marcocell. We take advantage of the invariance in the difference co-array so that the 2D nested array is able to calculate all elements in the covariance matrix of channel fading coefficients. Based on this premise, we demonstrate that the derivation procedure of average sum-rate capacity for the cooperative cellular networks is still valid for the nested distributed base stations (BSs) in the non-fading and Rayleigh fading channels. In numeric simulations, the derived formulas are consistent with the results from previous references. More importantly, given the same number of BSs, the proposed distribution significantly increases the sum-rate capacity of the system.