Title :
Performance of equalizers employing a re-training RLS algorithm for digital mobile radio communications
Author :
Ueda, Takashi ; Suzuki, Hiroshi
Author_Institution :
NTT Radio Commun. Syst. Lab., Kanagawa, Japan
Abstract :
To improve the transmission performance of high bit-rate digital mobile radio communications in frequency-selective fading environments, a retraining recursive least squares (RT-RLS) algorithm for a decision feedback equalizer (DFE) is proposed. Performance evaluation experiments were carried out with a real-time experimental system that includes a DFE implemented by a single-chip digital signal processor (DSP). Experiments were performed by transmitting 250 kbit/s quadrature phase shift keying (QPSK) at a maximum Doppler frequency up to 160 Hz. The experiment assumes a two-wave model, in which waves have the same power and fluctuate independently with Rayleigh distribution. A bit error ratio (BER) performance below 10-2 was realized
Keywords :
digital radio systems; digital signal processing chips; equalisers; least squares approximations; mobile radio systems; performance evaluation; radiowave propagation; 160 Hz; 250 kbit/s; BER performance; DSP; Doppler frequency; QPSK; Rayleigh distribution; bit error ratio; decision feedback equalizer; digital mobile radio communications; performance evaluation experiments; quadrature phase shift keying; radiowave propagation; real-time experimental system; retraining algorithm; retraining recursive least squares; single-chip digital signal processor; transmission performance; two-wave model; Decision feedback equalizers; Fading; Frequency; Land mobile radio; Least squares methods; Mobile communication; Quadrature phase shift keying; Real time systems; Resonance light scattering; Signal processing algorithms;
Conference_Titel :
Vehicular Technology Conference, 1990 IEEE 40th
Conference_Location :
Orlando, FL
DOI :
10.1109/VETEC.1990.110383
