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引用次数: 2
摘要
由于需要在无线信道上进行高速数据传输，人们提出了多输入多输出（MIMO）技术，因为它能显著提高信道容量。在实践中，自适应调制方案可应用于不同的 MIMO 算法，以进一步提高系统效率。本文利用两种算法推导出 MIMO 系统频谱效率的闭式表达式：正交时空块编码（OSTBC）和带零强迫（ZF）接收器的空间复用。此外，还根据闭式表达式提出了一种在 OSTBC 和 ZF 之间切换的低复杂度自适应方案，以实现更高的频谱效率。
The Spectral Efficiency of 2 × 2 Adaptive MIMO Systems in Spatially Correlated Rayleigh Fading Channel
In need for high-speed data transmission over wireless channels, multiple-input multiple-output (MIMO) technology has been suggested as it exhibits significant improvement in channel capacity. In practice, adaptive modulation scheme can be applied in different MIMO algorithms to further improve the system efficiency. In this paper, we derive closed-form expressions for the spectral efficiency of MIMO system utilizing two algorithms: Orthogonal Space-Time Block Coding (OSTBC) and spatial multiplexing with zero-forcing (ZF) receiver. Furthermore, a low-complexity adaptive scheme that switches between OSTBC and ZF to achieve even a higher spectral efficiency is suggested based on the closed form expressions.
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