By Muthuthamby Sreetharan; Rajiv Kumar
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5 kHz). With greater intersymbol interference, the system has limited tolerance to noise and distortion. The narrower channel also limits Mobitex’s tolerance to frequency offsets between units. Several manufactures offer single-chip baseband GMSK modems facilitating the implementation of a GMSK system using standard FM radio topologies. Mobitex is a hierarchical network consisting of network control center, main exchanges, area exchanges, and base stations. Traffic flows only as high up the hierarchy as necessary; switching can be done locally at any node level.
Wireless LANs and wireless PBXs will likely to be important applications for the unlicensed spectrum. 12. The PCS service provider has the burden of choosing one or more of the above technologies as the infrastructure framework. 6 Microwave Relocation for PCS Deployment PCS systems in the 1,850- to 1,990-MHz band will have to coexist with the existing microwave systems until they are upgraded or relocated. Fortunately, since the microwave links are stationary, the impact of these systems on others can be quantified if accurate configuration data is available.
2 E-TDMA E-TDMA, a Hughes Network Systems (Germantown, MD) developed technology, is an extension to the IS-54B standard and uses the same protocol architecture, frame formats, and control mechanisms. In IS-54B, each call is assigned a fixed time slot in a specific channel, which remains unchanged for the duration of the call. In contrast, E-TDMA uses dynamic assignments of the call-to-time slot mapping while the call is in progress. Further the time slot switch need not be restricted to be in the same RF channel but can be selected from a configured pool.