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An implementation of a CMA adaptive array for high speed GMSK transmission in mobile communications

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4 Author(s)
T. Ohgane ; Commun. Res. Lab., Minist. of Posts & Telecommun., Tokyo, Japan ; T. Shimura ; N. Matsuzawa ; H. Sasaoka

The hardware implementation of an adaptive array as a technique for compensating multipath fading in mobile communications is described. The number of the antenna elements is four. The target communication system is modulated by 256 kbps Gaussian-filtered minimum shift keying (MSK) and has a time-division multiplexing (TDM) architecture with 24 time slots. Based on the digital beamforming concept, all of the signals and the array weights are digital-signal processed. The constant modulus algorithm (CMA) is employed for weight optimizing. In an additive white Gaussian noise channel, this system has 5.6-dB gain in an energy-per-bit-to-noise-density ratio at a bit error rate (BER) of 1.0×10-3, compared with a single antenna system. The result of the basic field test shows that the gain at a BER of 1.0×10-3 reaches 22.3 dB in a nonselective, slow Rayleigh fading channel given a 5 Hz maximum Doppler shift

Published in:

IEEE Transactions on Vehicular Technology  (Volume:42 ,  Issue: 3 )