Multiple-Input Multiple-Output (MIMO) antennas and Multi-Carrier Code Division Multiple Access (MC-CDMA) are very promising candidates for simultaneous utilize in 4G systems, since they attain robustness, high spectra...
详细信息
ISBN:
(纸本)9781424455324
Multiple-Input Multiple-Output (MIMO) antennas and Multi-Carrier Code Division Multiple Access (MC-CDMA) are very promising candidates for simultaneous utilize in 4G systems, since they attain robustness, high spectral efficiency, and high data rates in rich scattering environments. This paper proposes an efficient hybrid detection algorithm for downlink MC-CDMA system based on orthogonalfrequency Division Multiplexing (OFDM). The proposed algorithm combines Energy Spreading Transform (EST) technique and the iterative architecture pilot based Minimum Mean Square Error (MMSE) channel estimation as well as Modified Projection Approximation Subspace Tracking Deflation (MPASTD) method, so called Hybrid EST Iterative MMSE-MPASTD (HEIMM) algorithm. The HEIMM algorithm contributes steadfastly to an accurate system design and evaluation with full rate mode in a space-frequency format of extended multiple antennas method also in the framework of a practical MC-CDMA system. Beneath high order modulation, the simulation results are presented to exhibit an improved Bit Error Rate (BER) performance with reduced-rank computational complexity that independent of different system loading.
Multiple-Input Multiple-Output (MIMO) antennas and Multi-Carrier Code Division Multiple Access (MC-CDMA) are very promising candidates for simultaneous utilize in 4G systems, since they attain robustness, high spectra...
详细信息
ISBN:
(纸本)9781424455317;9781424455324
Multiple-Input Multiple-Output (MIMO) antennas and Multi-Carrier Code Division Multiple Access (MC-CDMA) are very promising candidates for simultaneous utilize in 4G systems, since they attain robustness, high spectral efficiency, and high data rates in rich scattering environments. This paper proposes an efficient hybrid detection algorithm for downlink MC-CDMA system based on orthogonalfrequency Division Multiplexing (OFDM). The proposed algorithm combines Energy Spreading Transform (EST) technique and the iterative architecture pilot based Minimum Mean Square Error (MMSE) channel estimation as well as Modified Projection Approximation Subspace Tracking Deflation (MPASTD) method, so called Hybrid EST Iterative MMSE-MPASTD (HEIMM) algorithm. The HEIMM algorithm contributes steadfastly to an accurate system design and evaluation with full rate mode in a space-frequency format of extended multiple antennas method also in the framework of a practical MC-CDMA system. Beneath high order modulation, the simulation results are presented to exhibit an improved Bit Error Rate (BER) performance with reduced-rank computational complexity that independent of different system loading.
Multi-carrier CDMA and multiple antennas are very promising candidates for simultaneous use in 4G systems, since they achieve robustness, high spectral efficiency, and high data rates in rich scattering environments. ...
详细信息
ISBN:
(纸本)9781424416523
Multi-carrier CDMA and multiple antennas are very promising candidates for simultaneous use in 4G systems, since they achieve robustness, high spectral efficiency, and high data rates in rich scattering environments. Especially, in this work an efficient extended multiple transmit antenna scheme with M-T=4 elements and full rate mode for a downlink scenario has been designed and detailed evaluated. Its efficiency is enhanced by the use of an iterative architecture as a counterbalance of the quasi-orthogonal nature of the transmit diversity scheme, offering overall a higher degree of diversity gain. The evaluation has been performed in the framework of a realistic MC-CDMA system transmitting in a space-frequency format Furthermore, the incorporation of an efficient pilot based MMSE channel identification, tracking and compensation scheme contribute resolutely to an accurate system design and evaluation. The evaluation has been performed over various spatial channel models according to IEEE 802.16e case of 3GPP.25.996 definition incorporating all IF/RF stages.
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