| Popis: |
A variant of multi-station access based on Spread Spectrum Signals (SSS) with multiphase non-harmonic subcarriers modulated using pseudorandom sequences (PRSs) that provide a direct extension of their spectrum is considered. It is shown that in this case partial frequency-code compaction of signals is provided. In this case, the main PRS provides a direct expansion of the signal spectrum, and the sub-carrier PRS-on the contrary, its narrowing and localization in the frequency domain. The paper considers a variant of channel information encoding when increasing the distance between the points of the information signal constellation when transmitting its closest points on different subcarriers of the PRS, which allows increasing the bandwidth of the communication channel. In addition, the narrowing of the main correlation peak of the synchro-signal, compared with the case of transmission only to the main PRS (without a subcarrier), will improve the accuracy of synchronization and positioning. |
