By Y. Jay Guo
An engineer with a protracted 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 generally on high-level architectural matters. He highlights the benefits of complex applied sciences, but in addition discusses significant theoretical and useful difficulties that they increase for process 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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3 Hearability Problem and Countermeasures The OTDOA technique relies on the fact that terminals can receive signals from a number of geographically dispersed base stations. Unfortunately, this may not always be the case in practice. Transmitters in a CDMA network share a common frequency channel all the time, and closer transmitters tend to “drown out” more distant ones, making it impossible for the mobile terminal to measure the signals from those more distant transmitters. In other words, a terminal close to its serving Node B may not hear other Node Bs on the same frequency, which is termed the “hearability” problem in UTRAN .
This will help reduce mobile terminal transmit power and increase cell capacity and coverage. Another advantage of superconducting filters and the cryogenic receiver front end is that they can be installed as add-on appliqué modules without changing the configuration of the existing system. The advantage of the superconducting filters can be further exploited to enable dynamic spectrum allocation or more efficient spectrum utilization in regions where the spectrum is not tightly regulated, such as the United States.
The resolution of each sample depends on the number of bits used. • Spurious-free dynamic range (SFDR). Spurious-free dynamic range is defined as the range of signal amplitudes that can simultaneously be processed without distortion or be resolved by a receiver without the emergence of spurious signals above the noise floor. For the current software radio base stations, the ADC commands a sampling rate of at least 60 MHz, 14 bits, and a spurious-free dynamic range of more than 90 dB. Pushed by the demands from software radio design companies, ADC manufacturers are introducing products that need to meet those requirements.