Title :
High bit rate π/4-QPSK modem with a new equalizer based on sequence estimation for mobile communications
Author :
Kamio, Yukiyoshi ; Moriyama, E. ; Sasaoka, Wideichi ; Hamaguchi, Kiyoshi ; Sugimoto, Yuji
Author_Institution :
Commun. Res. Lab., Minist. of Posts & Telecommun., Tokyo, Japan
Abstract :
This paper proposes a new type of greatly reduced-complexity sequence estimation in which stronger power delay waves are selected and combined. The proposed method has a similar BER performance and a greatly reduced complexity than MLSE. A high-bit-rate transmission system with a rate of 10 Mbit/s, π/4-QPSK/TDM for multimedia data transmission in land mobile communications is implemented. In adopting a 4-channel TDM, a user bit rate of 2 Mbit/s can be achieved. The system can compensate for delayed waves of up to 1.8 μsec and sustains a maximum Doppler frequency (fd) of 240 Hz
Keywords :
Doppler effect; Viterbi decoding; adaptive equalisers; coding errors; delays; digital radio; error statistics; fading; land mobile radio; modems; multimedia communication; multipath channels; quadrature phase shift keying; sequences; time division multiple access; time division multiplexing; 1.8 mus; 10 Mbit/s; 2 Mbit/s; 240 Hz; 4-channel TDM; BER performance; MLSE; TDMA; Viterbi decoding; adaptive equalizer; delayed waves compensation; digital land mobile communications; high bit rate π/4-QPSK modem; high-bit-rate transmission system; land mobile communications; maximum Doppler frequency; multimedia data transmission; multipath fading compensation; power delay waves; reduced-complexity sequence estimation; user bit rate; Bit error rate; Bit rate; Data communication; Delay estimation; Equalizers; Maximum likelihood estimation; Modems; Multimedia systems; Propagation delay; Time division multiplexing;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 1997. Waves of the Year 2000. PIMRC '97., The 8th IEEE International Symposium on
Conference_Location :
Helsinki
Print_ISBN :
0-7803-3871-5
DOI :
10.1109/PIMRC.1997.630915
