Mobile communication’s development requires high data transfer rate and highquality of service (QoS). So how to achieve higher spectrum efficiency and betterQos with the finite recourse and harsh wireless channel conditions is the keyproblem for the next generation mobile communication. MIMO and OFDM is thecore technology of the next generation mobile communication because of theirsuperior
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Modern mobile communication system requires high-speed and large capacity data transmission. OFDM (Orthogonal Frequency Division Multiplexing) technique, with effective anti-fading and noise/interferences suppression, becomes one of the key components in next-generation mobile systems, permitting a possible increase in both transmission speed and capacity. Consequently, in LTE specification, OFDM and MIMO (Multiple Input and Multiple Output)
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In order to resolve the current tension in wireless spectrum resource, cognitive radio has come into being, and because of the good performance of Orthogonal Frequency Division Multiplexing (OFDM), OFDM can be applied to the OFDM-based cognitive radio systems. Nowadays, the research on power allocation algorithm in the OFDM-based cognitive radio systems is very hot.
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As continuous development and maturity of 3G and Beyond 3G services, the demand for global high-speed data transmission and multimedia services is increasing. Mobile satellite communication is suitable for high-speed transmission due to its large coverage area, broadcast and multicast working mode and other intrinsic properties. Whereas, the frequency selective fading channel characteristics and deficient
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The broadband wireless communication not only can carry out broadband and theinformation communications anywhere by all means at any time, but also can providehigh mass, high reliability and high baud rate movement communication service in thefuture. Along with consumers’ movement communication of the request continuouslyraise, the advantage of broad bond wireless system (Broadband Wireless Access,
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IEEE802.11a is one of the standards in IEEE originally determined wireless LAN,which is mainly used to connect the office LAN and campus network users to the userterminal through wireless access, providing potential ways for telecommunication mobility,personality, and multimedia applications. And it becomes one of the effective broadbandwireless accesses. IEEE802.11a physical layer convergence protocol applies OrthogonalFrequency
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The broadband wireless communication not only can carry out broadband and theinformation communications anywhere by all means at any time, but also can providehigh mass, high reliability and high baud rate movement communication service in thefuture. Along with consumers’ movement communication of the request continuouslyraise, the advantage of broad bond wireless system (Broadband Wireless Access,
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The future broadband wireless communication systems are expected to provide ubiquitous, high-reliability and high-data-rate mobile multimedia transmission. Broadband and mobility is the development direction of future communications. And how to provide high speed communication in complex wireless environment becomes a hot research topic in recent years. In this paper, MIMO and OFDM, which are consider
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Orthogonal Frequency Division Multiplexing(OFDM)has become the key technique in broadband wireless access and the next generation mobile communication system. Extensive attentions have been paid to OFDM due to its high spectral efficiency,high data rate and well anti-multipath ability.However, there are well-known shortcomings of OFDM technology: the timing offset and frequency offset is very sensitive. Timing
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As a key technology of the fourth-generation mobile communication, the OFDM technology received a widespread attention and study. Modulation signal recognition is an important branch in researches of the modern mobile communication. It requires us to detect the useful signal and estimate various modulation parameters in the complex wireless environment to provide the conditions for
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