Path: utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!thunder.mcrcim.mcgill.edu!snorkelwacker.mit.edu!think.com!sdd.hp.com!zaphod.mps.ohio-state.edu!unix.cis.pitt.edu!dsinc!casbah.acns.nwu.edu!accuvax.nwu.edu!nucsrl!telecom-request From: motcid!ellis@uunet.uu.net (John T Ellis) Newsgroups: comp.dcom.telecom Subject: Re: How Will Digital Cellular Increase Capacity? Message-ID: <16804@accuvax.nwu.edu> Date: 11 Feb 91 14:37:15 GMT Sender: news@accuvax.nwu.edu Reply-To: John T Ellis Organization: Motorola Inc. - Cellular Infrastructure Div., Arlington Hghs, IL Lines: 22 Approved: Telecom@eecs.nwu.edu X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@eecs.nwu.edu X-Telecom-Digest: Volume 11, Issue 111, Message 9 of 12 Digital cellular will increase capacity in the following manner. The first method under development (and actually being tested) is TDM - Time Division Multiplexing. The capacity increase on paper is 3:1 (3 times more than current analog). The other method being looked at is CDM - Code Division Multiplexing. On paper it is said to provide an increase of 20:1. The biggest problem with these new technologies is the size of the phone needed to implement them. Currently the phone designs call for some huge ie. garbage can, phone with an unbelievable power source. So ... digital cellular is a ways off. Motorola is currently working on a new technology called NAMPS - Narrow band Advanced Mobile Phone Service. This is an analog technology that will increase capacity of current analog systems 3:1. Hope this helps. John T. Ellis 708-632-7857 Motorola Cellular motcid!ellis@chg.mcd.mot.com