Title :
Digital adaptive transversal equalizer for multipath compensation in line-of-sight digital radio systems
Author :
Wong, W.K. ; Cheung, Philip
Author_Institution :
Dept. of Electron. Eng., City Polytech. of Hong Kong, Hong Kong
Abstract :
The growth of digital microwave radio has been rapid since the early 1970´s. The authors compare various digital implementations of the baseband symbol-spaced transversal equalizer for combating multipath fading distortion for quadrature amplitude modulation (QAM) radio systems. Various degradations such as: finite step size, number of quantization levels in the analogue-to-digital converter (ADC), rounding error in arithmetic and the demodulation phase error have been evaluated. Finally, the required number of quantization levels and arithmetic accuracy for practical symbol-spaced equalizer design are proposed for QPSK to 1024QAM radio systems
Keywords :
adaptive systems; amplitude modulation; compensation; digital radio systems; equalisers; error analysis; fading; microwave links; phase shift keying; radio equipment; signal processing; 1024QAM radio systems; ADC; LOS system; QPSK; adaptive transversal equalizer; arithmetic rounding error; baseband type; demodulation phase error; digital radio systems; finite step size; line-of-sight; microwave radio; multipath compensation; multipath fading distortion; quadrature amplitude modulation; quantization levels; symbol-spaced equalizer design; Arithmetic; Baseband; Degradation; Demodulation; Equalizers; Fading; Quadrature amplitude modulation; Quadrature phase shift keying; Quantization; Roundoff errors;
Conference_Titel :
Circuits and Systems, 1991. Conference Proceedings, China., 1991 International Conference on
Conference_Location :
Shenzhen
DOI :
10.1109/CICCAS.1991.184306
