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FCC is Federal Communication Commission, which issues licenses to the stations for specific frequencies. It also decides who is able to use which frequency for what purpose. Since Bluetooth is using unlicensed spectrum, FCC has no direct involvement with Bluetooth
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Sunday, May 11, 2008
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Frequency-Hopping Spread-Spectrum (FHSS) is a spread spectrum modulation scheme that uses a narrowband carrier that changes frequency in a pattern known to both transmitter and receiver. Properly synchronized, they maintain a single logical channel. To an unintended receiver, FHSS appears as short-duration impulse noise. More simply, the data is broken down into packets and transmitted to the receiver of other devices over numerous "hop frequencies" (79 total) in a pseudo random pattern. Only transmitters and receivers that are synchronized on the same hop frequency pattern will have access to the transmitted data. The transmitter switches hop frequencies 1,600 times per second to assure a high degree of data security
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Thursday, May 08, 2008
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CDMA stands for Code Division Multiple Access. It is a channel access method. It employs spread spectrum technology (Direct Spread Spectrum).
Transmitter Side:
In CDMA, a narrowband message signal is multiplied by a very large bandwidth signal celled the spreading signal. This spreading signal is a Psuedo Noise Code signal. All users in CDMA system use the same carrier frequency and may transmit simultaneously. Each user is identified by it's own psuedorandom codeword. This psuedorandom codeword is orthogonal to one another. In this way, each user is separated from the others.

Receiver Side:
For detecting the message signal, the receiver needs to know the codeword used by the transmitter.
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Thursday, March 13, 2008
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FHSS (Frequency-Hoping Spread Spectrum) is a method of wireless communications in which the system switches, or hops, between several different frequencies for a specific amount of time.
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Tuesday, April 01, 2008
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DSSS (Direct Sequence Spread Spectrum) is a method of wireless communications in which the signal is encoded with extra redundant bits of information that the receiving device can decode to help correct errors.
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Tuesday, April 01, 2008
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FCC is federal communication comitee of USA. it is regulatory authority of USA like TRAI  in india.
Its role is to allocate frequencies from RF spectrum (1 HZ- 300 GHZ) and providing licences for different application like TV, mobile communication, satellite communication  etc.,
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Wednesday, March 12, 2008
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A flare is defined as a sudden, rapid, and intense variation in brightness. A solar flare occurs when magnetic energy that has built up in the solar atmosphere is suddenly released. Radiation is emitted across virtually the entire electromagnetic spectrum, from radio waves at the long wavelength end, through optical emission to x-rays and gamma rays at the short wavelength end. The amount of energy released is the equivalent of millions of 100-megaton hydrogen bombs exploding at the same time! The first solar flare recorded in astronomical literature was on September 1, 1859.
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Monday, January 21, 2008
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The main reason why a ITU (International Telecommunication Union)TELECOM event stands out from the rest is because:

  • High quality of trade visitors and participants. They are not a consumer show- we are strictly a trade show. This means that our event visitors as well as those taking part are from the global (or regional) ICT industry. And they represent the full spectrum of the industry, from ministers and regulators to CEOs of Fortune 500 companies. Only at an ITU TELECOM event could you find such a diverse and valuable set of participants. Because of this, the scope for meeting, networking and getting business done is unrivalled.

  • ITU is a part of the United Nations: TELECOM events are organized by ITU - the UN agency for telecommunications. The mandate is truly global and, as well as organizing global events for the telecommunications community, also carry out vital work within the field of telecommunications. These include the management of radio frequency spectrum- a core and finite resource, and the development of global telecommunications standards, shaping the communication networks of today and tomorrow. ITU also runs a number of initiatives underpinning the growth of ICTs in emerging economies. These initiatives span areas from the provision of training for regulators in newly liberalized markets to the establishment of multipurpose community telecentres in rural, isolated or poorly served areas. Additionally, ITU also provides policy advice, achieved through research and analysis, to identify emerging trends in the telecommunications environment and their implications for government and industry.

  • ITU is a non-profit making organization. Any surplus generated from the events is put into a special fund, a part of which is then used for development projects. In recent years these projects have helped benefit a wide range of areas, from training regulators in developing countries, to helping countries that have recently emerged from extended periods of war to rebuild their telecommunications infrastructures. By exhibiting and partaking in ITU TELECOM events, therefore, participants are helping to promote and support the development of telecommunications and deployment of new technologies across the globe.

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Tuesday, October 16, 2007
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The advantages of Wi-Fi are:

  • Unlike packet radio systems, Wi-Fi uses unlicensed radio spectrum and does not require regulatory approval for individual deployers.

  • Allows LANs to be deployed without cabling, potentially reducing the costs of network deployment and expansion. Spaces where cables cannot be run, such as outdoor areas and historical buildings, can host wireless LANs.

  • Wi-Fi products are widely available in the market. Different brands of access points and client network interfaces are interoperable at a basic level of service.

  • Competition amongst vendors has lowered prices considerably since their inception.

  • Wi-Fi networks support roaming, in which a mobile client station such as a laptop computer can move from one access point to another as the user moves around a building or area.

  • Many access points and network interfaces support various degrees of encryption to protect traffic from interception.

  • Wi-Fi is a global set of standards. Unlike cellular carriers, the same Wi-Fi client works in different countries around the world.

 

 

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Tuesday, October 16, 2007
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Ultra violet photography is a photographic process of recording images by using light from the ultraviolet (UV) spectrum only.There are two ways to use UV radiation to take photography - reflected ultraviolet and ultraviolet fluorescence
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Sunday, August 26, 2007
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