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A cellular repeater (also known as cell phone signal booster or amplifier), in the cell phone industry, is a device used for boosting the cell phone reception to the local area by the usage of a reception antenna, a signal amplifier, and an internal rebroadcast antenna. These are similar to the cellular broadcast towers used for broadcasting by the network providers, but are much smaller, usually intended for use in one building. Modern cellular repeater amplifiers can rebroadcast cellular signals inside a building. The systems usually use an external, directional antenna to collect the best cellular signal, which is then transmitted to an amplifier unit which amplifies the signal, and retransmits it locally, providing significantly improved signal strength. The more advanced models often also allow multiple cell phones to use the same repeater at the same time, so are suitable for commercial as well as home use. ==There are two types of signal boosters, or repeaters== 1. Analog Signal Boosters Most common type of amplifiers. These signal boosters are usually analog repeaters that use traditional technology to amplify (usually) all frequencies from cell phone carriers. They are almost always wide band (or broadband) repeaters. Such boosters are usually sold with a kit of outdoor antenna and cable and require an installation. 2. Smart Signal Booster This is a new category of Signal Boosters. This new category of modern boosters utilizes powerful all-digital baseband processors to clean the signal before it is rebroadcast (hence the "Smart" in the name Smart Signal Booster). Most of the Smart Signal Boosters have gains of 100 dB (compared to analog booster's gain of 63 to 70 dB) and are carrier-specific (hence they can have higher gain in the US according to new (FCC regulations )). Some of these new boosters, while more expensive than traditional analog booster, are plug and play: they usually don't need the installation of outdoor antennas (usually the donor antenna is inside the booster box). Most of the time, Smart Signal Boosters are carrier-specific and are under consideration by the FCC's new rules starting in 3/2014. The market for cellular repeaters is expected to grow rapidly over the coming years, particularly in the USA. This is due to the combination of the poor network coverage in some areas, and the large scale departure from the land-line system. The CTIA – The Wireless Association (formerly the Cellular Telecommunications & Internet Association) had predicted that by 2007 30% of phone users in the US would be mobile only - more than 60 million lines. This combined with the low population density (compared with Europe and Japan) means that many people will have to use some method to improve their home signal. One advantage of cellular repeaters is an increase in the cell phone's battery life, since it requires lower power to broadcast the signal to the local bi-directional amplifier, due to its proximity to the phone. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「cellular repeater」の詳細全文を読む スポンサード リンク
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