CDMA stands for Code Division Multiple Access. It is a method used in communication to allow multiple users to share the same communication channel at the same time. This technique is commonly used in mobile communications, enabling many people to make calls or send messages without interference.
The full form of CDMA is Code Division Multiple Access. It is a technology used in communication systems that allows multiple users to share the same frequency band simultaneously. By assigning unique codes to each user, CDMA enables data transmission without interference, making it suitable for mobile networks, GPS, and other communication applications.
CDMA is a method that allows many people to use the same communication channel at the same time. Instead of dividing the frequency band into separate parts for each user, CDMA assigns unique codes to each user. This means that all users can share the same frequency band without interfering with each other. CDMA works well with Analog to Digital Conversion (ADC), helping to improve how we use the available spectrum.
The concept of CDMA has a long history. It was first published in 1935 by a researcher named Dmitry Ageev. During World War II, CDMA technology was utilized to protect communications from being jammed. In 1957, Leonid Kupriyanovich used CDMA in a model of a wearable mobile phone. By 1993, the Telecommunications Industry Association approved standards for CDMA technology, and by September 1998, there were 16 million users of CDMA systems across 22 countries.
The CDMA encoder processes the input signal, which can be a voice signal or digital data. It does the following:
The encoder is also known as a multiplexer, as it combines multiple signals into one.
The decoder works on the receiving end and performs the following functions:
The decoder is sometimes referred to as a demultiplexer because it separates the combined signals back into their original forms.
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