Patent ID: 8605753

Claim:
A method of performing Pseudo-Noise (PN) quadrature covering for transmitting data via an access channel by an access terminal, the method comprising: receiving an access long code mask MI ACMAC and an access long code mask MQ ACMAC by the access terminal; generating a MI mask (In-phase mask) which is a mask sequence used for generating a PNI (In-phase pseudo-noise) sequence and a MQ mask (Quadrature-phase mask) which is a mask sequence used for generating a PNQ (Quadrature-phase pseudo-noise) sequence by the access terminal; generating the PNI and the PNQ which are sequences for the PN quadrature covering by the access terminal; and transmitting the data covered with the generated PNI sequence and the data covered with the generated PNQ sequence via the access channel by the access terminal, wherein the MI ACMAC and the MQ ACMAC are related to an Access channel Medium Access Control (MAC) protocol, wherein MI 3 to MI 0 of the MI mask and MQ 3 to MQ 0 of the MQ mask are set to the lower 4 bits of an assigned channel number, wherein MI 11 to MI 4 of the MI mask are set to be equal to the result of (A 31 to A 24 )⊕(A 23 to A 16 )⊕(A 15 to A 8 )⊕(A 7 to A 0 ), where A 31 to A 0 are lower 32 bits of the MI ACMAC , wherein MQ 11 to MQ 4 of the MQ mask are set to be equal to the result of (B 31 to B 24 )⊕(B 23 to B 16 )⊕(B 15 to B 8 )⊕(B 7 to B 1 , B 32 ), where B 31 to B 0 are lower 32 bits of the MQ ACMAC , where B 32 is the 33rd bit of the MQ ACMAC , wherein ⊕ denotes exclusive OR operation, and wherein the PNI is a sequence summed by the MI mask and a PN sequence generated by a polynomial PI(x)=x 12 +x 6 +x 4 +x +1 for the In-phase branch of the Quadrature Phase Shift Keying (QPSK) and the PNQ is a sequence summed by the MQ mask and a PN sequence generated by a polynomial PQ(x)=x 12 +x 9 +x 3 +x 2 +1 for the Quadrature-phase branch of the Quadrature Phase Shift Keying (QPSK).