4Sabel L P,Mc Carthy J R.An Investigation of CDMA Overlays for FDMA Satellite Communications Systems[J].IEEEE Universal Personal Commun.1994,6(1):252-256.
5Still R M,Mc Carthy J R,Rice M.A Performance Analysis of an Overlay of CDMA and FDMA Satellite Communications Systems[C]∥Third Annual Internat ional Conference on Universal Personal Communications,1994:221-225.