Joint detection CDMA antenna diversity techniques

In the early 1990s the development of an air interface concept for UMTS and IMT 2000 was started, which is based on a combination of the multiple access methods FDMA, TDMA and CDMA, and in which multiple access interference is combatted by joint detection in the receivers. This air interface concept is termed joint detection (JD)-CDMA. In cellular mobile radio systems the directional inhomogeneity of the radio channels can be exploited to increase the spectral efficiency by antenna diversity techniques. The goal of this paper is to demonstrate the beneficial effects of receiver antenna diversity techniques in the uplink of JD-CDMA air interfaces. By means of computer simulations of realistic scenarios, the spectral efficiencies obtainable by different versions of antenna diversity techniques, namely space diversity, antenna arrays and sets of sector antennas are determined