With the development of technology, it is also rapid development of communication technology. Communication technology, while there have been many difficulties and problems to be addressed, especially now that more and more mobile communication business volume, would demand the type of communication and quality to meet the communication needs of people now. Communication rate required
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Multiple-Input Multiple-Output (MIMO) technology can efficiently increase channel capacity and improve the bit error rate (BER) performance by setting multiple antennas for sending and receiving signal at the transmitter and receiver without increasing the system bandwidth or transmit power. As a key technology for MIMO system, spatial modulation can improve the BER performance greatly while
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With the sharp increase of the number of wireless terminals, the intense competition for spectrum resource will occur soon. Cognitive radio is a promising technology, which allows the coexistence of PU and SU to improve the spectrum utilization. MIMO is also regarded as an advanced technology for its considerable capacity and highly receiving performance. MIMO
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With the rapid growth of the wireless communications business needs, the availablespectrum resources are increasingly scarce. However, research found that the allocated spectrumresources are idle of different degree and it is static radio spectrum management that results inthe shortage of spectrum resources. Therefore cognitive radio, an intelligent dynamic spectrumsharing technology, is proposed.Cognitive radio continuously sense,
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The development of wireless mobile communication technology leads to thetraffic trend to video，multimedia traffics in communication technology from thetraditional voice communication, so that larger bandwidth and greater capacity onthe wireless network are required. Multi-input multi-output (MIMO), as a majorbreakthrough in wireless mobile communication technologies, can greatly improvesystem capacity and spectrum utilization, and it has been
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The contradiction between the shortage of wireless spectrum and the demand of high data rate is becoming more and more prominent, and it’s imperative to improve the spectral efficiency. Static radio resource allocation can’t meet the need of communication because of the complexity and uncertainty of the wireless communication environment. In order to increase the
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This paper researchs the space-time coding、spatial multiplexing and multiuser diversity in MIMO systems. After introducing the research backgroud、principle、realization、channel capacity and decoding algorithm,we research the antenn selectiom algorithm and adpative resource allocation technique in MIMO spatial multiplexing system。In MIMO systems, the multi-antenna array can bring about performance improvement. However, the antenna array would lead to excessive
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As the development tendency of communications, wireless communications has become an important sign of the social development. The future communication systems are expected to satisfy higher requirement. It needs to offer not only high quality voice operation, but also high data rate and multimedia services.Multiple input multiple output (MIMO) technique as a great breakthrough for
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With the rapid development of wireless communications, the available bandwidth for wireless applications becomes more and more insufficient. Therefore, how to improve data rate without expending bandwidth becomes a key point in modern communication system design. Recently, orthogonal frequency division multiplexing (OFDM) technique and multiple antennas technique, which can be used to increase spectral efficiency
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Along with the development of the service requirements, Wireless communications have developed from only voice service to multi-media service such as image, video and data. The rich media content leads to demand for high access data rate. High data rate wireless communication, nearing Gbps transmission rates, is of interest in emerging WLAN (Wireless Local Area
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