Smart Antennas for Wireless Communications: IS-95 and Third Generation CDMA Applications

Appendix A. Multiple Access Interference and the Gaussian Approximation

In analyzing the impact of Multiple Access Interference in DS-CDMA systems, as described in Chapter 1, we must consider the detailed structure of the contribution of each interfering signal to the decision statistic, Z₀. This is given by I_k in (1.32).

The relationship between b_k(t − τ_k), a_k(t − τ_k), and a₀(t) is illustrated in Figure A-1. The quantities γ_k and Δ_k in Figure A-1 are defined from the delay of user k relative to user 0, τ_k, such that [Pur77]:

Equation A.1. 

Figure A-1. Timing ...