This paper presents the design and the main performance results of a test-bed for a Code Division Multiple Access (CDMA) digital modem with linear adaptive interference-mitigating detection (IMD) and supporting multi-rate transmission. The aim of this experiment is to demonstrate the suitability of such a receiver architecture, including IMD, to integration into a hand-held user terminal. The test-bed allows for real-time testing of a complete digital CDMA transmission chain, featuring the recently proposed Extended Complex-valued Blind Adaptive Interference- mitigating Detector (EC-BAID) [1] for single-user detection of a CDMA signal. Signal plus Multiple Access Interference (MAI) generation is performed via a computer-controlled arbitrary waveform generator, followed by frequency up-conversion to the standard analogue intermediate frequency (IF) 70 MHz, and by Additive White Gaussian Noise injection with the aid of a precision noise generator. Particular emphasis is devoted to the description of all functions ancillary to IMD, such as generation of the MAI, and robust signature code timing acquisition and tracking under heavy user loading. The test-bed is controlled via IEEE488 bus by a master PC with a dedicated control program specially developed in LabVIEW. This allows maximum configuration control flexibility on one side, and easy derivation of performance results in terms of BER (Bit Error Rate), spectral analysis, sync parameters evolution etc. on the other.

A Multi-Rate Real-Time Test-Bed for Low-Complexity Adaptive Interference Mitigation in CDMA Transmission

FANUCCI, LUCA;GIANNETTI, FILIPPO;LUISE, MARCO
2001

Abstract

This paper presents the design and the main performance results of a test-bed for a Code Division Multiple Access (CDMA) digital modem with linear adaptive interference-mitigating detection (IMD) and supporting multi-rate transmission. The aim of this experiment is to demonstrate the suitability of such a receiver architecture, including IMD, to integration into a hand-held user terminal. The test-bed allows for real-time testing of a complete digital CDMA transmission chain, featuring the recently proposed Extended Complex-valued Blind Adaptive Interference- mitigating Detector (EC-BAID) [1] for single-user detection of a CDMA signal. Signal plus Multiple Access Interference (MAI) generation is performed via a computer-controlled arbitrary waveform generator, followed by frequency up-conversion to the standard analogue intermediate frequency (IF) 70 MHz, and by Additive White Gaussian Noise injection with the aid of a precision noise generator. Particular emphasis is devoted to the description of all functions ancillary to IMD, such as generation of the MAI, and robust signature code timing acquisition and tracking under heavy user loading. The test-bed is controlled via IEEE488 bus by a master PC with a dedicated control program specially developed in LabVIEW. This allows maximum configuration control flexibility on one side, and easy derivation of performance results in terms of BER (Bit Error Rate), spectral analysis, sync parameters evolution etc. on the other.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/202630
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