CDMA (Code Division Multiple Access) is a channel access method used in wireless communication systems that allows multiple users to share the same frequency band simultaneously, unlike methods such as FDMA or TDMA that divide access by frequency or time.
Key Concepts:
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Spread Spectrum Technique: CDMA spreads each user’s signal over a wide frequency band using a unique pseudo-random code.
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Unique Codes for Each User: These codes enable the receiver to distinguish between different users transmitting on the same frequency simultaneously.
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Simultaneous Access: Multiple users can access the channel at the same time without causing interference to each other.
Advantages:
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Efficient Bandwidth Usage: Allows more users to share the same bandwidth without signal collisions.
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Better Signal Quality: Provides strong resistance to noise and interference, resulting in improved call quality.
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Improved Privacy: Unique coding of signals makes eavesdropping difficult, enhancing security.