Power of two length pseudorandom noise sequence generator

Details Power of two length pseudorandom noise sequence generator Power of two length pseudorandom noise sequence generator

1994-12-20

1996-07-02

Swann, Glen

Coded data generation or conversion

Code generator or transmitter

341187, 375200, 364717, G08C 1912

Patent

active

055326951

ABSTRACT:
A mobile communication method is disclosed, and particularly a power of two length pseudorandom noise sequence generator is disclosed, in which a pseudorandom noise code sequence is generated to use it for a direct sequence spreading of communication signals in a spread spectrum communication system. In the PN sequence generator, a mask value and a comparison value are calculated for shifting the PN sequence output having a length of 2.sup.N as much as wanted, so that the PN sequence can be shifted as much as a predetermined value in response to the single clock signal. In order to generate a PN sequence of the desired timing, a new PN mask value is directly obtained from the current PN mask value and the offset shift value to be shifted, and at the same time, a comparison value corresponding to the mask value is obtained, whereby ultimately a PN sequence having a length of 2.sup.N after shifting the cycle as much as the desired shifting value is obtained. The present invention adopts a method of forming a new comparison value corresponding to the PN mask value by using a comparison value translator, and as a result, the conventional additional circuits for inserting an additional bit into the PN sequence output are not required, and therefore, the constitution of the present invention is very much simplified compared with the conventional apparatus.

REFERENCES:
patent: 4493046 (1985-01-01), Watanabe
patent: 5046036 (1991-09-01), Tezuka
patent: 5228054 (1993-07-01), Rueth et al.

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