| 摘要 |
FIELD: information technologies. ^ SUBSTANCE: essence of the method consists in expansion of a pack from M m-level Quarter phase peak modulation (QPPM) figures by means of two pseudorandom sequences (PRS), one of which is periodically inverted in some of packs. Due to it on the receiving side of the components of signal QPPM corresponding meander signal of inverting the PRS (which frequency is known) are allocated. It also provides ambiguity elimination in synchronisation frequency trim on the female leg. The method is realised in the corresponding system, and can be carried out as hardware, and as software. Besides, this method can be applied to synchronisation of reception of QPPM signals. ^ EFFECT: decrease in threshold of demodulation in not licensed frequency bands at the expense of low threshold of sync. ^ 12 cl, 7 dwg |
