Posts Tagged ‘code division multiple access’
CDMA
November 18th, 2007
CDMA is an acronym for Code Division Multiple Access. CDMA uses two concepts in the transmission of calls. The first, (FDMA), or Frequency Division Multiple Access, divides a frequesny band into slots. Each frequency slot is given to a caller. This concept is akin to tuning into radio stations as each station is assigned a radio frequency. Now, combining this with TDMA technology, CDMA allows users to spread calls over various time slots and various frequencies at the same time. This is accomplished using a technique know a Spread Spectrum, wherein each transmission chunk is given a key to decode the information received at the other end. This technology surpasses the TDMA standard in terms of efficiency as the more calls can be spread over a smaller amount of bandwidth. CDMA technology is a multiple access technique, using sequenced code to divide traffic channels within the same radio channels.
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