Iterated PDA Detector for CDMA Systems with QAM Constellation
Li Gang, Daoben Li · Journal of Changchun Post and Telecommunication Institute · 2005
Here a GPDA(Generalized PDA) method from MIMO(Multiple Input Multiple Output) systems is generalized to multi-user detection scenario,which detects square QAM(Quadrature Amplitude Modulation) modulated rather than BPSK(Binary Phase Shift Key) modulated symbols,and a SISO(Soft Input Soft Output) multi-user detector(MUD) scheme is presented.By concatenating SISO channel decoder with this novel SISO MUD,and by iteratively exchanging external information between,a new SISO GPDA+SISO FEC(Forward Error Correction) joint MUD detector is deducted.Simulation results justify the fast-convergence probability(about 5 iterations less than LMMSE(Linear Minimum Mean Square Error) scheme)and near-ML(Maximum Likelihood) performance of this method.