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

Volume

2

fYear

1997

fDate

1-4 Sep 1997

Firstpage

312

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 (f_d) 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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/PIMRC.1997.630915

Filename

630915