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| The Scheme and Performance Analysis of Combined Beamforming with Space-Time Block Coding |
| Li Min①; Lin Min②; Gong Zheng-quan②; Peng Run-lan③; Li De-xiang① |
| ①Institute of Communication Engineering; PLA Univ.of Sci. & Tech; Nanjing 210007; China; ②The 63rd Research Institute of PLA General Staff Headquarters; China; ③The Factory of Fire-Resistant Material; Chongqing Iron and Steel Company; Leshan 614900; China |
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Abstract Combined beamforming with Alamouti space-time block coding may not be optimal under many situations since it only provides two equal power loading beams. A new scheme which combines beamforming with space-time block coding is proposed in this paper. The number of beams the new scheme provides is determined by the channel correlation matrix eigenvalues, and is not more than the number of transmit antennas. Condition on the number of space-time block coding transmit antennas is the same as the number of beams, the new scheme combines beamforming with space-time block coding of any code rate.Gauss-Chebyshev quadrature is used to calculate the symbol error rate of the new scheme for linear modulation and a simple numerical method is derived. The new scheme could improve the performance dramatically by providing diversity gain and beamforming gain simultaneously.
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Received: 20 July 2006
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2008, Vol. 30 
