Device and method for efficient decoding with time reversed data

A wireless communications mobile station comprising:

• a. transmitting circuitry which transmits as spread spectrum signals data provided by a user;
• b. receiving circuitry which receives spread spectrum signals and converts the signals into a form intelligible to the user;
• c. PN sequence generator circuitry operationally connected to the transmitting circuitry and the receiving circuitry;
• d. a chip rate clock, operating at a chip rate, which clocks the PN sequence generator circuitry,
• wherein the receiving circuitry includes decoding circuitry which efficiently decodes data encoded with a cyclic code in communications systems where a convolutional code is applied after the cyclic code during encoding, wherein the decoding circuitry accepts data provided in time reversed order by a Viterbi decoder which decodes the convolutional code.

A wireless communications system comprising:

• a. a mobile station,
• b. a base station subsystem which controls the radio link with the mobile station, and
• c. a network subsystem which is interfaced with a public fixed network and the base station subsystem, wherein said mobile station comprises the following:
• (1) transmitting circuitry which transmits as spread spectrum signals data provided by a user;
• (2) receiving circuitry which receives spread spectrum signals and converts the signals into a form intelligible to the user;
• (3) PN sequence generator circuitry operationally connected to the transmitting circuitry and the receiving circuitry;
• (4) a chip rate clock, operating at a chip rate, which clocks the PN sequence generator circuitry,
• wherein the receiving circuitry includes decoding circuitry which efficiently decodes data encoded with a cyclic code in communications systems where a convolutional code is applied after the cyclic code during encoding, wherein the decoding circuitry accepts data provided in time reversed order by a Viterbi decoder which decodes the convolutional code.