Skip to Main Content
Blind detection of a desired user's signal in a multirate direct sequence code division multiple access (DS-CDMA) system (using either variable sequence length, VSL, or multicode, MC, access) is considered. In multirate CDMA systems, a high-rate user signal may be treated as the superposition of several virtual basic-rate signals. A code-constrained inverse filter criterion (IFC)-based (also CMA-based) blind detector for equal-rate CDMA signals to detect a desired user's signal was recently presented by J.K. Tugnait and Tongtong Li (see IEEE Trans. Sig. Proc., vol.SP-49, p.1300-09, 2001; IEEE Journal on Selected Areas in Communications, vol.SAC-19, p.1520-30, 2001; Li and Tugnait, Proc. IEEE 2001 ICASSP, 2001). Novel approaches combining the code-constrained IFC and a penalty function are developed to extract simultaneously all virtual users associated with a given high-rate user in VSL and MC multirate access methods. Global minima of the proposed cost functions are analyzed. An illustrative simulation example is provided.
Signals, Systems and Computers, 2001. Conference Record of the Thirty-Fifth Asilomar Conference on (Volume:2 )
Date of Conference: 4-7 Nov. 2001