By Y. Jay Guo
An engineer with an extended history in radio communications, and now with a British corporation, Guo surveys the applied sciences for advancements in cellular radio entry networks from the viewpoint of approach engineering, focusing frequently on high-level architectural matters. He highlights the benefits of complex applied sciences, but additionally discusses significant theoretical and useful difficulties that they bring up for approach designers. between his themes are linear transmitters, superconducting filters and cryogenic radio frequency entrance head, radio over fiber, software program radio base stations, cellular terminal positioning, and excessive- velocity downlink packet entry.
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Additional info for Advances in Mobile Radio Access Networks
It uses a reference receiver at a surveyed position to send correcting information to a mobile receiver over a communications link. Generally speaking, it is difficult to employ a traditional autonomous GPS receiver in mobile terminals for the following reasons. First, its start-up time, which is defined as the period from turning on to the initial position fix, is relatively long due to the long acquisition time of the navigation message ranging from 30 seconds to a few minutes. Second, the GPS receiver is incapable of detecting weak signals that result from indoor and urban canyon operations.
The software radio technology will help minimize network operators’ cost of future network upgrades, from introducing new carriers to migrating to HSDPA. In fact, these four technologies are not independent. Instead, they can be integrated together to form advanced radio access systems in the future. For instance, the radio heads can be equipped with linearized transmitters and cryogenic receivers, both having wide bandwidth. The base station server can be built on software radio hardware and software architecture, and be connected to the radio head via an optical fiber network.
1 UE-Assisted GPS The network-based UE-assisted solution shifts the majority of the signal processing in the traditional GPS receiver to the network processor. This method requires an antenna, RF circuits, and some digital processing capability in the mobile terminal for making measurements by generating replica codes and correlating them with the received GPS signals. The network transmits a short assistance message to the mobile terminal, consisting of time, visible satellite list, satellite signal Doppler, and code phase search window.