Title :
Equalizer development for wide-band 16 QAM/TDMA in land mobile communications
Author :
Teshima, Isao ; Asano, Masahiro ; Kamata, Yohko ; Urabe, Kenzo ; Sasaoka, Hideichi
Author_Institution :
Sendai Lab., Kokusai Electr. Co. Ltd., Japan
Abstract :
We developed an experimental equalizer for wide-band 16 QAM/TDMA in land mobile communications that works under frequency-selective fading environments, and performed an laboratory experiment. Frame synchronization is important for an equalizer to work properly. In conventional frame synchronization, false synchronization due to delayed-wave occurs under non-minimum-phase condition, leading to degraded performance. We propose a new frame synchronization method that examines the direct-wave and delayed-wave signal power ratio, and even under non-minimum-phase condition, can hold synchronization to the direct-wave, to maintain the equalizer performance. BER performance in the experiment is improved about 10 times at Eb/N0 equal to 20 dB with delay of 3 to 5 symbols in the maximum Doppler-frequency equal to 40 Hz
Keywords :
quadrature amplitude modulation; 16 QAM/TDMA; BER performance; delayed-wave signal power ratio; direct-wave signal power ratio; equalizer; frame synchronization; frequency-selective fading environment; land mobile communications; maximum Doppler-frequency; non-minimum-phase condition; space diversity; wideband transmission; Bit error rate; Degradation; Delay; Equalizers; Fading; Frequency synchronization; Mobile communication; Quadrature amplitude modulation; Time division multiple access; Wideband;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 1994. Wireless Networks - Catching the Mobile Future., 5th IEEE International Symposium on
Conference_Location :
The Hague
Print_ISBN :
90-5199-193-2
DOI :
10.1109/WNCMF.1994.530797
