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The race to 4G has already started with an increasing involvement of all cellular industry. With the increasing variety of technologies targeting 4G, and actors in competition, the migration to 4G appears to be a complex thing. This paper presents the expected market requirements for 4G, explains the complexity of future technology landscape, with an emphasis on the standards in competition, and spectrum...
0.4-5.2 GHz broad-band SiGe-MMIC direct conversion quadrature mixer (Q-MDC) has been developed for multi-band multi-mode cognitive radio receivers by using 0.35 mum SiGe BiCMOS process. To realize broad-band characteristic, a static frequency divider with two-stage emitter follower is used as 90 degree power divider for LO and broad-band doubly balanced mixers are used as I/Q unit mixers. The 90 degree...
4G evolution includes improvements beyond 3G as well as nomadic and mobile versions of fixed broadband wireless access (BWA) systems, such as WiFi and WiMAX. The resulting trend is technological and application convergence in an increasingly competitive marketplace. This introductory paper to the Focused Session "Convergence and Competition on the Way to 4G" concentrates on three key contributing...
In recent mobile communication systems, impairments in analog circuits cannot be disregarded due to achieving high performance. Errors in analog circuits consist of a distortion of a power amplifier(PA), gain and phase imbalance in a quadrature modulator (QMOD) and a quadrature demodulator (QDEMOD), dc offset, frequency offset, and so on. Because of high accuracy of compensation, many techniques of...
An integrated artificial intelligence optimised cellular radio channel allocation and call dropping algorithm is presented. The components of the system comprise a new genetic algorithm (GA) based channel allocation scheme, and a novel application of fuzzy logic to call dropping technique. The new method is compared to both random allocation and to a conventional allocation approach. The results show...
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