A very low power and high-quality signal transmission baseband LSIC for personal communications-advanced signal processing and one-channel integration

Author

Kato, Shuzo ; Kubota, Shuji ; Seki, Kazuhiko ; Enomoto, Kiyoshi ; Kawazoe, Katsuhiko ; Sakata, Tetsu ; Kobayashi, Kiyoshi ; Matsumoto, Yoichi

Author_Institution

NTT Wireless Syst. Labs., Yokosuka, Japan

Volume

2

fYear

1994

fDate

28 Nov- 2 Dec 1994

Firstpage

1019

Abstract

This paper proposes a very low power consumption (2V operation) one-chip baseband LSIC for personal communication terminals. It is composed of a π/4 QPSK modem, a TDMA-TDD controller, an ADPCM codec and a LAPDC controller. The developed CMOS LSIC completely meets the PHS (Personal Handy Phone System) standard. By employing a novel coherent demodulator and an ADPCM codec with a click noise suppressor, 6dB higher-quality voice transmission has been realized in fading environments. Moreover, the novel circuit configurations of the modem, the ADPCM codec, the TDMA-TDD controller and the LAPDC controller make it possible to reduce significantly the power consumption of the baseband circuits of personal communication terminals

Keywords

CMOS digital integrated circuits; access protocols; codecs; digital signal processing chips; land mobile radio; large scale integration; modems; personal communication networks; quadrature phase shift keying; time division multiple access; π/4 QPSK modem; 2 V; ADPCM codec; CMOS LSIC; LAPDC controller; PHS standard; Personal Handy Phone System; TDMA-TDD controller; baseband LSIC; baseband circuits; circuit configurations; click noise suppressor; coherent demodulator; fading environments; high-quality signal transmission; one-chip integration; personal communication terminals; personal communications; power consumption reduction; signal processing; very low power signal transmission; voice transmission; Baseband; Circuit noise; Codecs; Communication system control; Demodulation; Energy consumption; Modems; Quadrature phase shift keying; Standards development; Working environment noise;

fLanguage

English

Publisher

ieee

Conference_Titel

Global Telecommunications Conference, 1994. GLOBECOM '94. Communications: The Global Bridge., IEEE

Conference_Location

San Francisco, CA

Print_ISBN

0-7803-1820-X

Type

conf

DOI

10.1109/GLOCOM.1994.512812

Filename

512812