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Pseudorandom noise (PRN) is a signal similar to noise which satisfies one or more of the standard tests for statistical randomness.

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Posted by waqqas1

Pseudorandom noise (PRN) is a signal similar to noise which satisfies one or more of the standard tests for statistical randomness.

Although it seems to lack any definite pattern, pseudorandom noise consists of a deterministic sequence of pulses that will repeat itself after its period.

Each pulse in this sequence is known as a chip and the inverse of its period as chip rate.
In spread-spectrum systems, modulated carrier transmissions appear as noise to any receiver that is:

1. not locked on the transmitter frequencies; or
2. incapable of correlating a locally generated pseudorandom sequence with the received signal.

A pseudonoise code (PN code) is one that has a spectrum similar to a random sequence of bits but is deterministically generated. The most commonly used sequences in direct-sequence spread spectrum systems are maximal length sequences, Gold codes, Kasami codes, and Barker codes

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Posted by avloginov