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Direct-sequence spread spectrum: Here, a high-bit-rate pseudorandom code is added to a low-bit-rate information signal to generate a high-bit-rate pseudorandom signal closely resembling to noise that contains both the original data signal and the pseudorandom code.  

The code has to known both to the transmitter and the intended receiver. The receiver upon detection of direct-sequence transmission, simply subtracts the pseudorandom signal from the composite receive signal to extract the information data. 

Adding a high bit-rate pseudorandom signal to the voice information makes the signal more dominant and less susceptible to interference, allowing lower power transmission and hence, a lower number of transmitters and less expensive receivers.

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Very useful. Thanks for sharing

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