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ML approaches to channel estimation for pilot-aided multi-rate DS/CDMA systems
Mestre Pons, Francesc X.; Rodríguez Fonollosa, Javier
Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions; Universitat Politècnica de Catalunya. SPCOM - Grup de Recerca de Processament del Senyal i Comunicacions
This paper analyzes the asymptotic performance of maximum likelihood (ML) channel estimation algorithms in wideband code division multiple access (WCDMA) scenarios. We concentrate on systems with periodic spreading sequences (period larger than or equal to the symbol span) where the transmitted signal contains a code division multiplexed pilot for channel estimation purposes. First, the asymptotic covariances of the training-only, semi-blind conditional maximum likelihood (CML) and semi-blind Gaussian maximum likelihood (GML) channelestimators are derived. Then, these formulas are further simplified assuming randomized spreading and training sequences under the approximation of high spreading factors and high number of codes. The results provide a useful tool to describe the performance of the channel estimators as a function of basicsystem parameters such as number of codes, spreading factors, or traffic to training power ratio.
Peer reviewed
Àrees temàtiques de la UPC::Enginyeria electrònica i telecomunicacions::Processament del senyal
Mobile communication systems
Code division multiple access
Broadband networks
Code division multiple access
Gaussian processes
Land mobile radio
Maximum likelihood estimation
Multiuser channels
Radio networks
Random codes
Spread spectrum communication
Pilot-aided multirate DS/CDMA systems
Asymptotic performance
Maximum likelihood channel estimation algorithms
ML channel estimation
Wideband code division multiple access
Periodic spreading sequences
Symbol span
Transmitted signal
Code division multiplexed pilot
Asymptotic covariances
Training-only channel estimators
Semi-blind conditional maximum likelihood estimator
Semi-blind Gaussian maximum likelihood estimator
Randomized spreading sequences
Randomized training sequences
High spreading factors
Multirate signal model
Synchronized spreading sequences
System parameters
Traffic to training power ratio
Third-generation mobile communication systems
Radioemissores mòbils
Accés múltiple per divisió de codi
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