用matlab編寫的用于跳頻技術(shù)的基于simulink環(huán)境的仿真程序-using Matlab prepared for the frequency-HOPPING technology based on Simulink environment simulation program
同步技術(shù)是跳頻通信系統(tǒng)的關(guān)鍵技術(shù)之一，尤其是在快速跳頻通信系統(tǒng)中，常規(guī)跳頻通信通過同步字頭攜帶相關(guān)碼的方法來實(shí)現(xiàn)同步，但對(duì)于快跳頻來說，由于是一跳或者多跳傳輸一個(gè)調(diào)制符號(hào)，難以攜帶相關(guān)碼。對(duì)此引入雙跳頻圖案方法，提出了一種適用于快速跳頻通信系統(tǒng)的同步方案。采用短碼攜帶同步信息，克服了快速跳頻難以攜帶相關(guān)碼的困難。分析了同步性能，仿真結(jié)果表明該方案同步時(shí)間短、虛警概率低、捕獲概率高，同步性能可靠。
Abstract:
Synchronization is one of the key techniques to frequency-HOPPING communication system， especially in the fast frequency HOPPING communication system. In conventional frequency HOPPING communication systems， synchronization can be achieved by synchronization-head which can be used to carry the synchronization information， but for the fast frequency HOPPING， Because modulation symbol is transmitted by per hop or multi-hop， it is difficult to carry the correlation code. For the limitation of fast frequency HOPPING in carrying correlation code， a fast frequency-HOPPING synchronization scheme with two HOPPING patterns is proposed. The synchronization information is carried by short code， which overcomes the difficulty of correlation code transmission in fast frequency-HOPPING. The performance of the scheme is analyzed， and simulation results show that the scheme has the advantages of shorter synchronization time， lower probability of false alarm， higher probability of capture and more reliable of synchronization.
SPREAD SPECTRUM MODULATION TECHNIQUES
-spread spectrum - those modulation methods that are producing a signal whose
spectrum is more wider than of the data signal, the occupied frequency band being
independent by the signal of data band.
-The signals with spread spectrum of direct sequence type BPSK (BPSK-DS-SS)
-The signals with spread spectrum of direct sequence type QPSK – DS–SS
- Frequency HOPPING spread spectrum signals (FH-SS)
