Title :
A QPSK/16 QAM receiver chip for LMDS application
Author :
Park, Ki Hyuk ; Shin, Dae Kyo ; Lee, Jun Sung ; Sunwoo, Myung H.
Author_Institution :
Dept. of Electron. Eng., Ajou Univ., Suwon, South Korea
Abstract :
This paper presents a QPSK/16 QAM down stream receiver ASIC chip for LMDS (Local Multipoint Distribution Services) applications. The proposed LMDS chip consists of a blind equalizer, a timing recovery block and a carrier recovery block. The blind equalizer uses a DFE (Decision Feedback Equalizer) structure using CMA (Constant Modulus Algorithm). The symbol timing recovery uses the modified parabolic interpolator and the decision-directed carrier recovery is used to remove the carrier frequency offset, phase offset and phase jitter. The implemented LMDS receiver can support four data rates, 10, 20, 30 and 40 Mbps and can accommodate the symbol rate up to 10 Mbaud. This symbol rate is faster than existing QAM receivers
Keywords :
application specific integrated circuits; blind equalisers; decision feedback equalisers; digital radio; quadrature amplitude modulation; quadrature phase shift keying; radio receivers; synchronisation; 10 to 40 Mbit/s; DFE structure; LMDS application; QPSK/16 QAM receiver chip; blind equalizer; carrier frequency offset; carrier recovery block; constant modulus algorithm; decision feedback equalizer structure; down stream receiver ASIC chip; local multipoint distribution services; modified parabolic interpolator; phase jitter; phase offset; symbol timing recovery; timing recovery block; Blind equalizers; Decision feedback equalizers; Finite impulse response filter; Frequency; Jitter; Multimedia communication; Quadrature amplitude modulation; Quadrature phase shift keying; TV broadcasting; Timing;
Conference_Titel :
ASICs, 2000. AP-ASIC 2000. Proceedings of the Second IEEE Asia Pacific Conference on
Conference_Location :
Cheju
Print_ISBN :
0-7803-6470-8
DOI :
10.1109/APASIC.2000.896945
