Details

Autor(en) / Beteiligte

• Dahlhaus, Dirk

Titel

Model Order Estimation for Joint Demodulation in DS-CDMA Systems

Ist Teil von

• International journal of electronics and communications, 2002, Vol.56 (1), p.27-35

Ort / Verlag

Stuttgart: Elsevier GmbH

Erscheinungsjahr

2002

Quelle

Access via ScienceDirect (Elsevier)

Beschreibungen/Notizen

• An iterative algorithm for estimating the number of relevant transmission paths characterized by the model order vector L in the uplink of a direct sequence code division multiple access (DS-CDMA) system is presented. Estimates of simplelower bounds on the probability of correct one-shot symbol estimates are formulated as a function of bit-error rate estimates of all users and maximized w.r.t. L . The joint demodulation for a given value L is accomplished using a combination of a space-alternating generalized expectation-maximization (SAGE) algorithm for channel parameter estimation and a°multistage detector. Simulation results indicate that the modelorder is estimated correctly even in situations with considerably differentsignal power levels.