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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. [1] 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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The British Artist Benedict Radcliffe created the car in many simulation works of art by wires materials in recent years, this time he published the Dizzee Rascal Air Max 90 ("Tongue and Cheek" Air Max Nike Air Max 24 7 Australia 90) for Nike Sportswear 1948 to London activities, which the arts designed entirely by this wire, in length up to 3.5 meters Nike Air Max installation art, you can see the design-one to play the United States Air Max convey the graceful charm, it is not quite intoxicated.

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The other pair of Nike Dunk Easter is the time of the Nike Dunk was conceived entirely in Nike's vision: to improve athletic performance. "innovation-driven designer our DNA," Nike Design Director Jesse Levya said, "It is with innovation, before the birth of these exciting new products. " Today, Dunk with a variety of color combinations is numerous. In Air Max Australia the past 23 years, sports shoes to all possible combinations of colors and designs debut, giving the wearer who to show True self Dunk wireless opportunities. Personality of this paragraph flying, dynamic Smart, color and feel are first win wearing!!

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The Nike Air Max shoe uses a large air cushioning unit at the heel which is visible from the side of the midsolein most models. Different types of Air Max cushioning include "Air Max2" which does not have the "holes" in thecushioning unit Cheap Nike Air Max 1 Hyperfuse and is of high pressure, "Tube Air" which is visible in several small circles on the midsole ofthe shoe, "Total Air" which is basically just another word for full Air Max cushioning, "Tuned Air" which is asystem of individual pods supposedly "tuned" to different areas of the foot. Air in the early 1990s which wasvisible through the bottom of the shoe (although smaller portions of Air units are visible through the bottom ofmany Air Max models) and another type of Air cushioning is the low profile and very responsive "Zoom Air".

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Nowadays, the awareness of eco-friendly is becoming more and more important for us; there always something we can do for protecting the environment and we can try our best from doing the small things.

Have you ever known that what products in your home are eco-friendly and can be reusable? Actually, we can buy many home decorations for using in our home.

From very beginning, we are rarely heard of the Environmental Friendly products, now, more and more people are developing some the eco-friendly for the buyers that become favor by us. For example, the Led lights and bulbs. The Led light bulbs for home have many advantages compared to other lights; the most important character of the bulbs is that it is save energy, and durable. Besides, it can easily recycle can produce harmless to people.

The wall decals and stickers are also can be used at our home, those eco-friendly decals and stickers are produce no odorous smell to us and it is very easy to stick and take off. Wall decals and stickers are very fashion goods if we can use in our home, it can beauty our home and also make a warm and cozy atmosphere in our home that you can make different styles at your home.

In fact, there are also many eco- friendly things in our home that we can buy the furniture, the Led TV and all kinds of electronic products. Nowadays, the society is very developed that we can buy the things online instead of going out. Online shopping is save our time and quick delivery, most importantly, we can have wider selections when we want to buy, and the gadgetsdealer is a good online site that you can access to. It sells many practical and useful things that satisfy your need.

Led light bulbs are more suitable for us to use that it can keep a long time, we don’ have to change the bulbs and lights frequently as well as waste our money. Also, the environmental friendly decals and stickers are good for our health and they are the awesome interior decorations for our home.

We are all responsible for protecting our earth and earth, with the society developing faster and faster, the light pollution and rubbish pollution are becoming more and more severely. It is very necessary for us to use some eco -friendly decorations at our home.