Spreading signal generating method, generating device, receiving method and receiving device

A method for receiving a spreading signal, the method comprising:

• generating a local replica of a spreading code of a spreading signal;
• generating a local replica of a binary subcarrier of a first spreading signal component and a local replica of a binary subcarrier of a second spreading signal component;
• generating a local carrier based on the phase difference between a phase of an RF carrier for modulating the first spreading signal component and a phase of an RF carrier for modulating the second spreading signal component;
• calculating a coherent integration for the spreading signal received and calculating a linear combination of results of the integration, based on the local carrier, the local replica of spreading code, the local replica of binary subcarrier of the first spreading signal component and the local replica of binary subcarrier of the second spreading signal component generated, so as to obtain an integrated in-phase channel component and an integrated quadrature-phase channel component;
• and
• wherein the coherent integration is calculated with the following equations:
• L1=∫t1t1+Tcoh{tilde over (S)}RF(t){circumflex over (c)}(t){circumflex over (q)}1(t)cos({circumflex over (ω)}t)dt
• L2=∫t1t1+Tcoh{tilde over (S)}RF(t){circumflex over (c)}(t){circumflex over (q)}1(t)sin({circumflex over (ω)}t)dt
• L3=∫t1t1+Tcoh{tilde over (S)}RF(t){circumflex over (c)}(t){circumflex over (q)}2(t)cos({circumflex over (ω)}t+θ)dt
• L4=∫t1t1+Tcoh{tilde over (S)}RF(t){circumflex over (c)}(t){circumflex over (q)}2(t)sin({circumflex over (ω)}t+θ)dt,
• and the linear combination is calculated with the following equations:
• I=Â1L1+Â2L3
• Q=−Â1L2−Â2L4,
• where {tilde over (S)}RF(t) stands for the spreading signal received, ĉ(t) is the local replica of spreading code, {circumflex over (q)}1(t) and {circumflex over (q)}2(t) are the local replica of binary subcarrier of the first spreading signal component and the local replica of binary subcarrier of the second spreading signal component respectively, {circumflex over (ω)} is an angular frequency of local carrier;
• t1 is a starting time for coherent integration, Tcoh is a duration for integration;
• Ã1 and Ã2 are a first weighting coefficient and a second weighting coefficient respectively, where Ã1:Ã2=A1:A2;
• L1, L2, L3, L4 are results of the coherent integration;
• and I and Q are the integrated in-phase channel component and the integrated quadrature-phase channel component respectively.