The paper investigates closed-loop spatial multiplexing systems with transmit antenna selection. Since the bandwidth limit of feedback channel, a partial MRT algorithm is proposed to reduce the amount of feedback info...
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ISBN:
(纸本)9781424405169
The paper investigates closed-loop spatial multiplexing systems with transmit antenna selection. Since the bandwidth limit of feedback channel, a partial MRT algorithm is proposed to reduce the amount of feedback information. An improved water-filling power allocation algorithm is obtained for optimal power allocation. The proposed method can not only reduce the amount of feedback, but also fully exploit potential multiplexing capability of the channel. Simulation results show that transmit antenna selection can compensate the loss caused by imperfect CSI at the transmitter.
The paper investigates closed-loop spatial multiplexing systems with transmit antenna selection. Since the bandwidth limit of feedback channel, a partial MRT algorithm is proposed to reduce the amount of feedback info...
详细信息
The paper investigates closed-loop spatial multiplexing systems with transmit antenna selection. Since the bandwidth limit of feedback channel, a partial MRT algorithm is proposed to reduce the amount of feedback information. An improved water-filling power allocation algorithm is obtained for optimal power allocation. The proposed method can not only reduce the amount of feedback, but also fully exploit potential multiplexing capability of the channel. Simulation results show that transmit antenna selection can compensate the loss caused by imperfect CSI at the transmitter.
Unused spectrum is being a limited commodity for the telecom industry. However, up to 500 MHz of unlicensed spectrum in 5 GHz band is in use for several applications and services, particularly in WiFi around the world...
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Unused spectrum is being a limited commodity for the telecom industry. However, up to 500 MHz of unlicensed spectrum in 5 GHz band is in use for several applications and services, particularly in WiFi around the world. Unlicensed spectrum has foreseen to play a vital role in 5G. It is already under discussion at different forums that how the unlicensed band advantage can promote 4G Long Term Evolution (LTE) networks. Long Term Evolution Unlicensed (LTE-U) is an extension of existing LTE mobile networks, and allow LTE technology to use unlicensed bands as an adjunct to the licensed band. It will not only deliver a better user experience to end users but also boost capacity for network operators. In this paper, a Simulink based LTE PDSCH (Physical Downlink Shared Channel) model is introduced which uses the 5 GHz band according to the specifications prescribed by LTE-U Forum and 3GPP (Third Generation Partnership Project). It demonstrates multi-codeword transmission within a small cell from an eNodeB to a User Equipment (UE). LTE enabling technologies like OFDMA, closed-loop spatial multiplexing, turbo channel coding and link adaptations are used to design this model. Minimum mean square error (MMSE) technique as a linear detection method is used for spatially multiplexed Multiple Input Multiple Output (MIMO). Bit error rate is analyzed for QPSK, 16-QAM, and 64-QAM and compared for hard and soft decisions MMSE based MIMO detection. Fairly improved throughputs are obtained for multi-antenna configurations considering the low mobility scenarios and low correlation settings between links.
IMT-Advanced system proposed by ITU-R for next,generation mobile communications has the technical requirements of the performances of an improved broadcast, a multicast and a VoIP by supporting the transmission rates ...
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ISBN:
(纸本)9781424448982
IMT-Advanced system proposed by ITU-R for next,generation mobile communications has the technical requirements of the performances of an improved broadcast, a multicast and a VoIP by supporting the transmission rates up to 100 Mbps for high mobility and I Gbps for low mobility. LTE-Advanced system is one of the leading candidates of IMT-Advanced systems and many telecommunications industries will introduce LTE-Advanced system widely. Therefore it is important to examine the performance of the technologies applied in LTE-Advanced system. In this paper, we analyze the performances of the transmission modes in the downlink spatial channel model of LTE-Advanced system.
IMT-Advanced system proposed by ITU-R for next generation mobile communications has the technical requirements of the performances of an improved broadcast,a multicast and a VoIP by supporting the transmission rates u...
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IMT-Advanced system proposed by ITU-R for next generation mobile communications has the technical requirements of the performances of an improved broadcast,a multicast and a VoIP by supporting the transmission rates up to 100 Mbps for high mobility and 1 Gbps for low ***-Advanced system is one of the leading candidates of IMT-Advanced systems and many telecommunications industries will introduce LTEAdvanced system *** it is important to examine the performance of the technologies applied in LTE-Advanced *** this paper,we analyze the performances of the transmission modes in the downlink spatial channel model of LTE-Advanced system.
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