Blind Identification of Time-Varying Dispersive CDMA Channels in Wireless Mobile Test Systems

摘要

In this paper, a new blind identification approach is presented for the code division multiple access (CDMA) time-varying dispersive channels in mobile wireless test system. Based on the canonical model, the approach is developed by sampling the channels' spreading function in time-frequency domain. With the approximately orthogonal property of the time- and frequency-shift spread codes, the time-varying (TV) systems can be converted into time-invariant (TI) multi-input, multi-output (MIMO) framework, thereby allowing blind identification to accomplished with the use of second-order statistics. Simulations illustrate the effectiveness of the proposed algorithm.