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time for LMDS may have come and gone In addition, newer wireless technologies like free-air laser hold a significant speed advantage over LMDS, as do submillimeter transmission in the 60 and 95 GHz bands Fiber optics is the primary transmission medium for broadband connectivity today However, of the estimated 46 million commercial buildings in the United States, 99 percent are not served by fiber Businesses are at a competitive disadvantage in today s information-intensive world unless they have access to broadband access services, including high-speed Internet access These businesses, including many data-intensive hightechnology companies, can be adequately served with LMDS Despite the financial problems of LMDS providers, the technology has the potential to become a significant portion of the global access market, which will include a mix of many technologies, including DSL, cable modems, broadband satellite, and fiber-optic systems
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MMDS
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This microwave technology traces its origins to 1972 when it was introduced to provide an analog service called Multipoint Distribution Service (MDS) For many years, MMDS was used for the one-way broadcast of television programming, but in early 1999, the FCC opened up this spectrum to allow two-way transmissions, making it useful for delivering telecommunication services, including high-speed Internet access to homes and businesses This technology, which has now been updated to digital, operates in the 2 to 3 GHz range, enabling large amounts of data to be carried over the air from the operator s antenna towers to small receiving dishes installed at each customer location The useful signal range of MMDS is about 30 miles, which beats LMDS at 75 miles and DSL at 18,000 feet Furthermore, MMDS is easier and less costly to install than cable service With MMDS, a complete package of television programs can be transmitted to homes and businesses Because MMDS operates within the frequency range of 2 to 3 GHz, which is much lower than LMDS at 28 to 31 GHz, it can support only up to 24 stations However, operating at a lower frequency range means that the signals are not as susceptible to interference as those using LMDS technology Most of the time the operator receives television programming via a satellite downlink Large satellite antennas installed at the head end collect these signals and feed them into encoders that compress and encrypt the programming The encoded video and audio signals are modulated via amplitude modulation (AM) and frequency modulation (FM), respectively,
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to an IF signal These IF signals are up-converted to MMDS frequencies, and then amplified and combined for delivery to a coax cable, which is connected to the transmitting antenna The antenna can have an omnidirectional or sectional pattern The small antennas at each subscriber location receive the signals and pass them via a cable to a set-top box connected to the television If the service also supports high-speed Internet access, a cable also goes to a special modem connected to the subscriber s PC MMDS sends data as fast as 10 Mbps downstream (toward the computer) Typically, service providers offer downstream rates of 512 Kbps to 20 Mbps, with burst rates up to 5 Mbps whenever spare bandwidth becomes available Originally, there was a line-of-sight limitation with MMDS technology But this has been overcome with a complementary technology called vector orthogonal frequency division multiplexing (VOFDM) Because MMDS does not require an unobstructed line of sight between antennas, signals bouncing off objects en route to their destination require a mechanism for being reassembled in their proper order at the receiving site VOFDM handles this function by leveraging multipath signals, which normally degrade transmissions It does this by combining multiple signals at the receiving end to enhance or recreate the transmitted signals This increases the overall wireless system performance, link quality, and availability It also increases service providers market coverage through non-line-of-sight transmission MMDS equipment can be categorized into two types based on the duplexing technology used: frequency division duplexing (FDD) or TDD Systems based FDD are good solutions for voice and bidirectional data because forward and reverse use separate and equally large frequency bands However, the fixed nature of this scheme limits the overall efficiency when used for Internet access This is because Internet traffic tends to be bursty and asymmetrical Instead of preassigning bandwidth with FDD, Internet traffic is best supported by a more flexible bandwidth allocation scheme This is where TDD comes in; it is more efficient because each radio channel is divided into multiple time slots through TDMA technology, which enables multiple channels to be supported Because TDD has flexible time slot allocations, it is better suited for data delivery specifically, Internet traffic TDD enables service providers to vary uplink and downlink ratios as they add customers and services Many more users can be supported by the allocation of bandwidth on a nonpredefined basis MMDS is being used to fill the gaps in market segments where cable modems and DSL cannot be deployed because of distance limitations and
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