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10 May 2002 No need for RF duplexer. ?. Can combine with FDMA/TDMA. ?. FDD/TDMA/FDMA: PDC. ?. TDD/TDMA/FDMA: PHS. 8. Code Division Multiple Access. ?. All users use same frequency and may transmit simultaneously. ?. Narrowband message signal multiplied by wideband spreading signal, or codeword.
Some second generation systems use CDMA. • Most of third generation systems use CDMA. User 2. User n. Code Types of Channels. ? Control channel. ? Forward (Downlink) control channel. ? Reverse (Uplink) control channel. ? Traffic channel. ? Forward traffic (traffic or information) channel. ? Reverse traffic (traffic
Fdma vs Tdma vs Cdma PDF - Free download as PDF File (.pdf), Text File (.txt) or read online for free.
10 Jul 2006 FDMA and 5.3 times more traffic capacity than TDMA. Key words: FDMA, TDMA, CDMA, Traffic Capacity. 1. INTRODUCTION. Traffic capacity calculations of FDMA and TDMA systems is a straightforward matter as each user. occupies a slice of the bandwidth or time slot respectively. If each user occupies
mance of slotted Aloha is comparable or better than. CDMA, while exhibiting a virtual insensitivity to prop- CDMA is larger than the capacity of FDMA or TDMA; in 3], Zorzi and Pupolin evaluated the performance of a SA protocol . This is done by means of a Ricean model, in which is a Rice r.v. with unit power and pdf 7].
22 Jan 2013 An introduction to the access technologies that allow multiple users to share a common communications channel.
the sharing is required to increase the capacity of cell or over a geographical area by allowing the available FDMA/TDD. U.S. Narrowband Spread Spectrum (IS-95): CDMA/FDD. 4) Space Division Multiple access (SDMA). FDMA,TDMA and CDMA are the three major multiple access techniques that are used to share the
17 Dec 2007 18. FDMA vs. TDMA. Frequency division is very simple: all transmitters sharing the medium have output power spectra in non-overlapping bands. Many of the problems experienced in TDMA due to different propagation delays are eliminated in FDMA. The major disadvantage of FDMA is the relatively
This page on FDMA versus TDMA versus CDMA provides difference between FDMA,TDMA and CDMA technologies.The useful links to difference between various terms are provided here.
Wireless Applications Corp. 111- 108t h Ave NE, #160 Bellevue, WA 98004 www.wirelessapplications.com. FDMA vs. TDMA vs. CDMA. As one of the major problems facing the development of telecommunications, bandwidth demand has driven the search for protocols that could be used to maximize bandwidth efficiency.
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