Low-power and high-quality signal transmission baseband LSIC for personal communications

Kiyoshi Kobayashi, Shuji Kubota, Kiyoshi Enomoto, Kazuhiko Seki, Katsuhiko Kawazoe, Tetsu Sakata, Yoichi Matsumoto, Takeshi Hattori

Research output: Contribution to journalArticlepeer-review


This paper presents a very low power consumption one-chip baseband large-scale integrated circuit (LSIC) for personal communication terminals. It comprises a π/4-shift QPSK modem, an adaptive differential pulse code modulation (ADPCM) codec, a time division multiple access time division duplex (TDMA-TDD) controller and a link access procedure for a digital cordless (LAPDC: Layer-2 protocol) controller. The developed LSIC meets all the specifications of the personal handy-phone system (PHS) standard. By employing a novel coherent demodulator and an ADPCM codec with a click noise suppressor, a higher-quality voice transmission has been achieved in a fading environment. In addition, it has 64-kb/s data transmission capability to achieve wireless multimedia services based on PHS. Moreover, the novel circuit configurations of the modem, the ADPCM codec, the TDMA-TDD controller, and the LAPDC controller achieve significant power reduction of the baseband circuits (57.4 mW) of personal communication terminals. It enables very low power consumption wireless multimedia terminals to be achieved based on the PHS common air interface.

Original languageEnglish
Pages (from-to)687-696
Number of pages10
JournalIEEE Transactions on Very Large Scale Integration (VLSI) Systems
Issue number4
Publication statusPublished - 1998
Externally publishedYes


  • Adaptive differential pulse code modulation (ADPCM) codec
  • Demodulator
  • Modulator
  • Personal communication
  • Personal handyphone system (PHS)
  • Protocol controller
  • Time division multiple access time division duplex (TDMA-TDD) controller

ASJC Scopus subject areas

  • Software
  • Hardware and Architecture
  • Electrical and Electronic Engineering


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