A flexible modem structure for increased network capacity and multimedia transmission in GSM PCS

  • Authors:

  • Chuck Brown;Kamilo Feher

  • Affiliations:

  • Intel Corporation, Folsom, CA and University of California, Davis, CA;Digcom Inc., El Macero, CA and University of California, Davis, CA

  • Venue:
  • INFOCOM'96 Proceedings of the Fifteenth annual joint conference of the IEEE computer and communications societies conference on The conference on computer communications - Volume 2
  • Year:
  • 1996

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Abstract

A reconfigurable Global Mobile Standard (GSM) compatible radio modem interface which doubles the number of simultaneous video and voice transmissions per channel is presented for personal communication systems (PCS). The result is that an average video frame rate of up l4 fps can be supported within a single TDMA time slot, doubling the number of conventional GMSK multimedia transmissions per GSM channel. The design employs an in-circuit reconfigurable cross-correlated FQPSK signal processing technique. This innovative network modem is reconfigured in-circuit for high bit rate data transmission or GSM compatible operation. Spectrum efficiency nf(b/s/Hz) is investigated in a nonlinear amplified (NLA) environment -- providing a 6 to 9 dB advantage in power eficiency. Our results show that the GSM compatible confisuration of a specific cross correlated FQPSK-KF implementation offers up to 5.1 dB improvement in Eb/No power efficiency, and network capacity nT. (erlangs/Hz m2) may be increased 76% over GMSKBTb=O.3.