Spread Spectrum Communication is an information transmission mode! the signal occupies the pass band width is much larger than the minimum bandwidth necessary information; band expansion is accomplished through a separate code sequence (generally a pseudo-random code)! encoding the and modulation methods to achieve. nothing to do with the preaching of information and data; at the receiving end with the same code synchronization receiver despreading and restore the preaching of the information data.  Spread spectrum communications and optical fiber communications, satellite communications. together known as the enter the information age of high-tech communication transmission mode. Working principle Forming a digital signal is modulated by the information in the information input by the originator first! and then the spreading code sequence generated by the spreading code generator to the modulated digital signal to the broadening of the signal spectrum. Broadening the signal is then modulated onto a radio frequency transmitter out, In the broadband RF signal received by the receiver to an intermediate frequency, and then despread with the originator of the same buy two way radios spreading code sequence generated by the local decorrelation, By demodulation, and restored to the original information output, Thus! - as a spread spectrum communication system should be carried out three times the modulation and corresponding demodulation! The first modulation information modulation, secondary modulation of the spread spectrum modulation. the three modulation of the radio frequency modulation! and the corresponding information demodulation and despreading the RF demodulation! Compared with the general communication system, spread spectrum communication is more spread-spectrum modulation and despreading section Performance advantages Can greatly expand the frequency spectrum of the signal due to spread spectrum communication, the sender with a spreading code sequence spread spectrum modulation, and at the receiving end with the relevant demodulation technique, it has many narrow band communication is difficult to replace the excellent performance in civil rapidly expanded to a variety of public and private communications networks. have the following characteristics: (1) Ease of frequency reuse to improve the utilization of radio spectrum! Very valuable wireless spectrum from long-wave microwave development and utilization have been! and still can not satisfy cheap two way radios the needs of the community. Mainly rely on narrowband communication channel is divided to prevent interference between the channel, To this end, the countries in the world have set up frequency management agencies. the user can only use the frequency of application is approved, The spread spectrum communication transmission power is very low, the associated receiver technology. and can work in the background of channel noise and thermal noise. easy to reuse the same frequency in the same region sharing the same frequency resources, and can also communicate with a variety of narrow-track, Therefore! the vast majority of countries in the United States and the world! the spread spectrum communication do not have to apply for frequency, any individuals and units are unlicensed use. (2) strong anti-interference! low bit error rate Transmission of the spread spectrum communication in the space occupied by the relatively wide bandwidth, the receiving end using the approach of the correlation detector despreading the useful the broadband information signal back into a narrowband signal. and the non-desired signal is expanded into a wideband discount two-way radios signal, and then by narrowband filtering techniques to extract the useful signal! Thus, for all kinds of interference signal. because at the receiving end of the non-correlation, the narrowband signal after despreading only very weak component, a high signal-to-noise ratio, and thus strong anti-interference. When the processing gain Gp 35dB, anti-interference tolerance Mj 22dB. under conditions of negative letter-noise ratio (22dB), the signal from the noise extracted. In commercial communication systems. the spread spectrum communication is a communication method capable of operating in the negative signal-to-noise ratio conditions. (3) good for hiding little interference of various narrowband communication system Spread spectrum signal in a relatively wide band extends the power per unit band is small! the signal is lost in the noise, generally not easy to find. and would like to further detection signal parameters. such as pseudo-random coding sequence is even more difficult . so I say it is good for hiding! Furthermore, since the spread-spectrum signal having a very low power spectral density, its use of a variety of narrow-band communication system interference is small!
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