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This article is presented by:
SABYASACHI RANA
SAPTARSHI CHATTERJEE
AVIK MODAK
ANURAN ROY CHOUDHARY
This article is presented by:
SABYASACHI RANA
SAPTARSHI CHATTERJEE
AVIK MODAK
ANURAN ROY CHOUDHARY
C D M A
What is Multiple Access?
Simultaneous private use of a transmission medium by multiple, independent users.
Advantages of Multiple Access
Increased capacity: serve more users
Reduced capital requirements since fewer media can carry the traffic
Decreased per-user expense
Easier to manage and administer
MOST POPULER MULTIPLE ACCESS TECHNOLOGIES THAT ESTABLISHED CHANNELS
FDMA (Frequency Division Multiplex Access)
each user on a different frequency
a channel is a frequency
TDMA (Time Division Multiplex Access)
each user on a different window period
in time (“time slot”)
a channel is a specific time slot on a specific frequency
CDMA (Code Division Multiplex Access)
each user uses the same frequency all the time
, but mixed With different distinguishing code patterns
a channel is a unique set of code patterns
Simultaneous private use of a transmission medium by multiple, independent users.
Advantages of Multiple Access
Increased capacity: serve more users
Reduced capital requirements since fewer media can carry the traffic
Decreased per-user expense
Easier to manage and administer
MOST POPULER MULTIPLE ACCESS TECHNOLOGIES THAT ESTABLISHED CHANNELS
FDMA (Frequency Division Multiplex Access)
each user on a different frequency
a channel is a frequency
TDMA (Time Division Multiplex Access)
each user on a different window period
in time (“time slot”)
a channel is a specific time slot on a specific frequency
CDMA (Code Division Multiplex Access)
each user uses the same frequency all the time
, but mixed With different distinguishing code patterns
a channel is a unique set of code patterns
