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Extra resources for Practical Wireless Data Modem Design (Artech House Mobile Communications Library)

Example text

Of course, any two-point link as described here can be a fundamental building elerrient of a complicated mu1t ipoint distributed wireless network. This chapter focuses on the basic parameters that infliience the characteristics of the propagation medium segment. These parameters include some considera- 39 Propagationsegment .................................................................................................................. -inte&rence -Fad@ -multipath efkcts Transmit Rece be ..................................................................................................................

Thc aim of a lirik budget is to account for all the signal powers arid signal lossm, so that, a siifficicrit signal power can be delivered to the receiver to maintain t k rcqiiirccl C/N. 111doing so, a link budget is riot unlike a financial balance sheet with rcvrriiie ori one side and expenditures on the other, arid a person trying hard to t)alariw tlit accounts. Thus, the C/N value at the satellite can be dctcrrriiried ty a tmsic uplirik C/N equation (the revenue side of the balance sheet) which, c\xprwscd iri dB, can be written a s rid.

1 18W alt: 5387 feet System parameters: Transmitter parameters: Operating freq. 5 Listing for the terrestrial LOS link calculation. 4 analysis p=l Fade margin required= 4 dB Link margin: (dB) Margin := ( TxPower - Pathloss) + TxAnt ... orri~riorilyacwptcci as accurate enough for most link tnidget calciilatioris. Ariotlicr c*orrirrionly uscc1 rain at tcriiiatiori rriodcl is the one recorrirrierided by the Iritorriatiod Radio Corisiiltativc Corrirriittce (CCIR). atiori is a very important parameter for the Crane rain rriocicl.

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