Multi-code CDMA wireless personal communications networks

Proposes a code division multiple access (CDMA) based system that can provide a smooth migration path to PCS, either from a digital cellular system (IS-95) or from a wideband CDMA system, to serve both isochronous and asynchronous applications. A unified digital bandwidth on demand platform is realized by allocating multiple codes (on demand), and hence increased capacity, to users. This approach, dubbed multi-code CDMA (MC-CDMA), will enable efficient delivery of all services made possible by digital cellular, CDPD, and other PCS technologies. Since a large variety of services (voice, data, image, and perhaps video) is expected in future wireless networks, users with very different, and time-varying, source rates will have to be accommodated. MC-CDMA is a wireless system whose rate (which is proportional to the number of codes assigned to the user) and service are dynamically matched to users' needs and can evolve from commercial digital cellular systems. This system retains the CDMA advantage in combating multipath and does not require significant modifications of the radio frequency (RF) circuitry. The dynamic, packet-like capacity access enabled by MC-CDMA will allow users to access the base station at different source rates, and when all other users are idle, will provide peak rate access to a single user.

[1]  Bhaskar Ramamurthi,et al.  Packet reservation multiple access for local wireless communications , 1989, IEEE Trans. Commun..

[2]  D.J. Goodman,et al.  Trends in cellular and cordless communications , 1991, IEEE Communications Magazine.

[3]  I Chih-Lin,et al.  Variable spreading gain CDMA with adaptive control for true packet switching wireless network , 1995, Proceedings IEEE International Conference on Communications ICC '95.

[4]  L. B. Milstein,et al.  Theory of Spread-Spectrum Communications - A Tutorial , 1982, IEEE Transactions on Communications.

[5]  A.J. Viterbi,et al.  Wireless digital communication: a view based on three lessons learned , 1991, IEEE Communications Magazine.

[6]  Andrew J. Viterbi,et al.  On the capacity of a cellular CDMA system , 1991 .

[7]  Mark Taylor,et al.  Wireless in-building network architecture and protocols , 1991 .

[8]  N. Amitay,et al.  Resource auction multiple access (rama) : efficient method for fast resource assignment in decentralised wireless PCS , 1992 .

[9]  D.C. Cox,et al.  Universal digital portable radio communications , 1987, Proceedings of the IEEE.

[10]  I Chih-Lin,et al.  A protocol for fast resource assignment in wireless PCS , 1994 .

[11]  Bruce Tuch,et al.  Development of WaveLAN®, an ISM band wireless LAN , 1993, AT&T Technical Journal.

[12]  Dipankar Raychaudhuri,et al.  Packet CDMA Versus Dynamic TDMA for Multiple Access in an Integrated Voice/Data PCN , 1993, IEEE J. Sel. Areas Commun..

[13]  I Chih-Lin,et al.  Variable spreading gain CDMA with adaptive control for integrated traffic in wireless networks , 1995, 1995 IEEE 45th Vehicular Technology Conference. Countdown to the Wireless Twenty-First Century.

[14]  D.C. Cox,et al.  Personal communications-a viewpoint , 1990, IEEE Communications Magazine.

[15]  R. White,et al.  Wireless in-building network architecture and protocols , 1991, IEEE Network.

[16]  David J. Goodman,et al.  Performance of PRMA: a packet voice protocol for cellular systems , 1991 .