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ML estimator and hybrid beamformer for multipath and interference mitigation in GNSS receivers
Seco Granados, Gonzalo; Fernández Rubio, Juan Antonio; Fernández Prades, Carlos
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 addresses the estimation of the code-phase(pseudorange) and the carrier-phase of the direct signal received from a direct-sequence spread-spectrum satellite transmitter. Thesignal is received by an antenna array in a scenario with interferenceand multipath propagation. These two effects are generallythe limiting error sources in most high-precision positioning applications.A new estimator of the code- and carrier-phases is derivedby using a simplified signal model and the maximum likelihood(ML) principle. The simplified model consists essentially ofgathering all signals, except for the direct one, in a component withunknown spatial correlation. The estimator exploits the knowledgeof the direction-of-arrival of the direct signal and is much simplerthan other estimators derived under more detailed signal models.Moreover, we present an iterative algorithm, that is adequate for apractical implementation and explores an interesting link betweenthe ML estimator and a hybrid beamformer. The mean squarederror and bias of the new estimator are computed for a numberof scenarios and compared with those of other methods. The presentedestimator and the hybrid beamforming outperform the existingtechniques of comparable complexity and attains, in manysituations, the Cramér–Rao lower bound of the problem at hand.
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria electrònica i telecomunicacions::Processament del senyal
Artificial satellites in telecommunication
Signal processing
Antenna arrays
Electromagnetic compatibility
Antenna arrays
Computational complexity
Direction-of-arrival estimation
Interference migration
Interference suppression
Iterative methods
Maximum likelihood principle
Phase estimation
Radio receivers
Radiofrequency interference
Satellite navigation
Spread spectrum communication
ML estimator
Hybrid beamformer
Interference mitigation
GNSS receiver
Code-phase estimation
Carrier-phase estimation
Direct-sequence spread-spectrum satellite transmitter
Multipath propagation
Iterative algorithm
Mean squared error method
Adaptive signal estimation
Array signal processing
Code division multiaccess
Delay estimation
Early-late estimator
Global Positioning System
Interference suppression
Multipath channel
Pseudorandom code
Radio navigation
Radio receiver
Satellite navigation system
Gaussian channel
Channel coding
Satèl·lits artificials -- Comunicacions
Processament del senyal
Antenes -- Agrupacions
Compatibilitat electromagnètica
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