Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!tut.cis.ohio-state.edu!pacific.mps.ohio-state.edu!linac!att!pacbell.com!ucsd!casbah.acns.nwu.edu!nucsrl!telecom-request From: mitel!Software!meier@uunet.uu.net (Rolf Meier) Newsgroups: comp.dcom.telecom Subject: Re: How Will Digital Cellular Increase Capacity? Message-ID: Date: 16 Feb 91 14:18:55 GMT Sender: news@casbah.acns.nwu.edu Organization: Mitel. Kanata (Ontario). Canada. Lines: 24 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 123, Message 9 of 10 In article <16804@accuvax.nwu.edu> John T Ellis writes: > 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. Neither of these methods increases the capacity of digital modulation compared to analog modulation. The REAL reason for capacity increase for digital modulation is that low bit-rate encoding (8 kb) has been proposed for digital cellular. In addition, digital modulation allows for better-defined cell boundaries, due to the increased "capture" quality of digital modulation. All the CDM proposals employ low-bit rate encoding. This confuses the issue when trying to compare it to other methods of modulation which may use 32 kb encoding. Rolf Meier Mitel Corporation