BER performance of CMA adaptive array for a GMSK/TDMA system-a description of measurements in central Tokyo

The bit-error-rate (BER) performance of a constant modulus algorithm adaptive array for a Gaussian-filtered minimum shift keying/time division multiple access (GMSK/TDMA) system is described. The measurement was carried out in central and suburban Tokyo. The system uses a modulation data rate of 256 kb/s. In order to reduce the effect of multipath fading, an adaptive array of four antenna elements is implemented using a digital beam forming concept. The improvement in input power, compared with that of a single antenna system, reaches 16 dB in suburban Tokyo and 19 to 23 dB in central Tokyo at a BER of 1.0*10/sup -2/. Moreover, in central Tokyo, the irreducible error seen in the single antenna system is removed by the adaptive array.<
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