Outside cell interference dynamics in cellular CDMA

Abstract

Absfrad-We study via computer simulation the computation of the outside-cell interference factor f for cellular codedivision multiple access (CDMA) wireless communication systems. This factor is inversely pmportional to system capacity, and so its computation is of great practical interest. To date, all studies have focused on the mean value off, without regard to its extrema or temporal dynamics. We compute values of the extrema for several propagation path loss exponents and wer velocities, and show that the maximum value off can be many times its mean value, and f can change as rapidly as the mobile user Doppler spread.

Analytical Tractability of Hexagonal Network Model With Random User Location

“…• As can be observed from equation (11), H n (x, b) decays very fast with n and becomes very small for n ≥ 1. Thus, the coefficients H n (x, b), for n ≥ 1, contribute very little on the value of f (m, b).…”

“…Several works have been made to give approximations of interferences in regular hexagonal networks based on observed simulation results [2]- [4], [11]. To the best of our knowledge, no closed exact formula, mathematically and rigorously proved, was found.…”

“…To prove that the Fourier series expansion of f is absolutely convergent, we shall explicitly evaluate H n and thus show (10) and (11). We first substitute D k,j with δ k 2 + j 2 − jk and r with xδ.…”

“…The proof of corollary 1 is simple. We have just to replace H n (x, b) in the expression of f (m, b) by the approximation of (11), valid for n ≥ 1, and then evaluate the sum in (23).…”

“…terms of SIR (Signal-to-Interference-Ratio) and SINR (Signalto-Interference-plus-Noise-Ratio). Its evaluation in wireless networks has been widely addressed but it is still a fresh topic interesting both academic and industrial communities [1]- [11]. Interferences depend on the geometric placement of radio sites in the network.…”