Texas Instruments Corporation

Zhengou Gu

Katherine G Brown

An augmented pseudo-noise sequence () is generated from a two or more pseudo-noise sequences, using LFSRs or other such devices. A segment () of a one pseudo-noise sequence (), having an arbitrary length, is inserted into another pseudo-noise sequence () at an arbitrary position, making the augmented sequence difficult to decipher by a third party. Additional segments of arbitrary length can also be inserted at arbitrary positions for further complexity.

Pseudo-noise sequence with insertion having variant length and position

An LFRS (,) calculates a PN sequence using Fibonacci form, such that when an offset is calculated from a known state, the bits of the new state comprise a block of sequence bits. Accordingly, to calculate a block having a length less than the length of the LFSR (,), all bits of the desired block can be calculated in a single offset calculation. If the block has a length greater than the length of the LFSR, one or more additional masks can be used to calculate the additional bits of the block sequence. Zero insertion is also supported.

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Zhengou Gu