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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Lakshmikumar, K.R. Friedman, V. Price, D.L. Le, T. Peterson, T.R. Barner, J.R. Green, D.W. Kumar, J. |
| Copyright Year | 1993 |
| Description | Author affiliation: AT&T Bell Labs, Allentown, PA, USA (Lakshmikumar, K.R.; Friedman, V.; Price, D.L.; Le, T.; Peterson, T.R.; Barner, J.R.; Green, D.W.; Kumar, J.) |
| Abstract | A base-band modem/codec chip for the dual-mode North American IS-54 standard is shown. In the digital mode of operation, this chip acts as a modem. On the transmit side, it performs pi /4-shifted DQPSK modulation, square-root raised-cosine filtering, and waveform synthesis. The receive section helps to demodulate the signal by minimizing the intersymbol interference using square-root raised-cosine filters. In the analog mode of operation, the chip behaves like a codec. The transmit section supports part of the frequency modulation process while the receive section acts as an analog-to-digital interface. In addition to integrating the signal-processing sections of the transmit and receive paths, the chip also offers auxiliary controls for such functions as automatic gain control, automatic frequency control, and transmit power control. A wideband data detector is provided to decode the Manchester-encoded forward analog control channel messages in stand-by mode or forward analog voice channel messages. |
| Starting Page | 148 |
| Ending Page | 149 |
| File Size | 300326 |
| Page Count | 2 |
| File Format | |
| ISBN | 0780309871 |
| DOI | 10.1109/ISSCC.1993.280019 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 1993-02-24 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Modems Codecs Telephony Code standards Filtering Signal synthesis Intersymbol interference Filters Frequency modulation Gain control |
| Content Type | Text |
| Resource Type | Article |
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