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The higher T/R frequencies must always be assigned to the upper antenna at the space diversity (usually the lower elevation) end of each hybrid diversity link for optimum performance Quad diversity is a type of hybrid diversity in which both sides of the link have space and frequency diversity, ie, a four-antenna system There are a number of different formulas to calculate quad diversity improvement factor Using microwave radio systems below 10 GHz, hop lengths of about 80 km (50 mi) usually are achieved without problems, utilizing standard diversity techniques11 When longer distances have to be spanned, however, the problems of propagation increase dramatically In the early 1990s, Siemens installed one of the longest over-the-water microwave hops for the Mexican telephone company, Telmex This hop was installed across the Gulf of California in the Baja California region, and was 160 km (100 mi) long Many classic models for estimating the fading behavior of a radio hop assume one reflection point and therefore two superimposed waves at the receiver location This basic assumption does not apply under extreme conditions such as this one To meet quality requirements under these very problematic propagation conditions, a customized solution and a number of unusual technical measures were implemented:

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Passive, data written once during manufacture, read only Passive, factory or field programmable once only, read only thereafter Passive, read/write, user memory and encryption Semi-passive, on-board sensors, read/write, user memory Active, read/write, on-board sensors, peer-to-peer communication with other active tags in same frequency band and with interrogators Essentially the interrogator, read/write, can power classes 0, 1, 2, and 3 tags, can wirelessly communicate with all the classes

Four large 46-m parabolic antennas at each side were used A selection of the best of eight received signals at any time was made (four antennas with two different frequencies) Custom-designed, very low-loss channel branching lters, using waveguide technology without circulators, were implemented Increased frequency spacing, achieving greater ef ciency of frequency diversity reception, was used

Theory and practice show that a higher number of receiving antennas increase the probability of receiving a strong and less distorted signal

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The classes 0, 1, and 2 are all passive tags with various write and memory capabilities The class 3 tags are semi-passive tags and may have an on-board sensor All the tags in classes 0, 1, 2, and 3 can communicate only with class 5 The class 4 tags are active tags and can communicate with any class 4 or 5 device A class 5 device is an interrogator and can communicate with any class Over time, some manufacturers have added functionalities to tags and started assigning their own class numbers, such as class 0+ tags, making the distinction between passive tag classes 0 through 2 become somewhat fuzzy As you will see in the next section, even the EPCglobal Gen 2 protocol does not follow the five-class classification: semi-passive tags are still referred to as class 3 tags and active tags are referred to as class 4 tags

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3724 Angle Diversity Angle diversity (sometimes called angle-ofarrival diversity) is a special case of space diversity Angle diversity (AD) has been used in line-of-sight digital microwave links since the mid-1980s and in troposcatter links since the 1950s This method used to be popular when digital radios were less robust, but today AD antennas are assigned mostly where installation constrictions (roof mounts problems, space, aesthetics, tower loading, and so on) prohibit SD and thus justify these less-effective, more-costly dishes

Protocols are the definition and grammar of the language used by the interrogators and tags to communicate with each other The interrogator and tag must use the same protocol to communicate The interrogator may have multi-protocol capability, but it uses only one protocol at a time Typically, a multi-protocol interrogator is set to a single protocol, or it may cycle through several protocols one by one Protocols may be designed by a manufacturer or by a standards organization Manufacturer designed protocols are usually proprietary and may not be available to all the manufacturers Protocols designed by a standards organization are called open protocols and are available on equal terms to all manufacturers For this reason, it is always a good idea to purchase equipment that uses an open and popular protocol; it increases the availability and compatibility of the equipment and helps protect your investment The protocols define air interface that is, how a tag and an interrogator communicate using electromagnetic waves This includes frequency of operation, emission power level, data rate, signal modulation, encoding of data bits, data structure, command structure, and anti-collision algorithm Examples of proprietary protocols include Philips I-Code, TI Tag-It, Alien EPC Class 1, Matrics EPC Class 0, and Intermec IntelliTag Examples of open protocols are ISO 14443 (A/B), ISO 15693, ISO 18000-6 (A/B), and EPCglobal Class 1 Generation 2 (Gen 2)