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CMDA

Also see CDMA One, CDMA2000, and WCDMA. Compare time-division multiplex (TDM) and frequency-division multiplex (FDM).
CDMA (code-division multiple access) refers to any of several protocols used in so-called second-generation (2G) and third-generation (3G) wireless communications. As the term implies, CDMA is a form of multiplexing, which allows numerous signals to occupy a single transmission channel, optimizing the use of available bandwidth. The technology is used in ultra-high-frequency (UHF) cellular telephone systems in the 800-MHz and 1.9-GHz bands.
CDMA employs analog-to-digital conversion (ADC) in combination with spread spectrum technology. Audio input is first digitized into binary elements. The frequency of the transmitted signal is then made to vary according to a defined pattern (code), so it can be intercepted only by a receiver whose frequency response is programmed with the same code, so it follows exactly along with the transmitter frequency. There are...

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Title: Gsm
Approximate word count: 657
Approximate pages: 3 (250 words per double-spaced page)

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1. What Is Gsm
   

   What is GSM. Overview The GSM system utilises new technologies efficiently. ... GSM uses
   a combination of two distinct methods to achieve these tight requirements. ...

2. Gsm
   

   gsm. ... TDMA is used by Digital-American Mobile Phone Service (D-AMPS), Global System
   for Mobile communications (GSM), and Personal Digital Cellular (PDC). ...

3. Evaluate Ber In Gsm And Wcdma Systems
   

   Evaluate BER in GSM and WCDMA Systems. Evaluate BER ... The Channel encoding scheme
   utilized in GSM is illustrated in Figure 3.5. This sequence ...

4. Edge In Gsm
   

   EDGE in GSM. INTRODUCTION GPRS networks are able ... networks (eg GSM). EDGE stands
   for 'enhanced data rates for GSM evolution'. The enhancement ...

5. Gsm
   

   GSM. The Global System for Mobile Communications (GSM) is the most popular standard
   for mobile phones in the world. ... GSM uses linear predictive coding (LPC). ...