MIMO正交mcds - cdma系统在Nakagami-m衰落信道上的频谱效率

James Osuru Mark, B. Samir, M. Naufal
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摘要

多输入多输出(MIMO)系统是在不增加系统带宽和传输功率的前提下,提高无线通信系统容量和降低码误率的一种很有前途的方法。本文研究了MIMO正交多载波直接序列码分多址(OMC DS-CDMA)系统在Nakagami-m衰落环境下的平均信道容量。在平均信道容量分析中,我们还考虑了系统相邻子载波间归一化空间的影响。多用户干扰(MUI)是影响系统性能的主要因素,采用高斯近似方法对其进行建模。因此,采用基于特征函数的方法推导了瞬时信噪比(SINR)的概率密度函数。因此,通过对Shannon信道容量的期望除以SINR的PDF,可以得到准确的平均信道容量的封闭表达式。结果表明,MIMO OMC - DS-CDMA系统的平均信道容量优于传统OMC - DS-CDMA系统。同样,我们观察到MIMO MC - DS-CDMA系统具有更好的频谱效率。因此,我们用蒙特卡罗模拟技术证实了数值结果。
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Spectral efficiency for MIMO orthogonal MC DS-CDMA system over Nakagami-m fading channels
Multiple Input Multiple Output (MIMO) systems have appeared as one of the promising approaches for increasing the capacity and lowering symbol or bit error probability of the wireless communication systems without increasing the bandwidth or the transmission power of the system. In this paper, we investigate the average channel capacity for MIMO orthogonal multicarrier direct Sequence Code Division Multiple Access (OMC DS-CDMA) system in Nakagami-m fading environment. We also consider the influence of the normalized space between two adjacent subcarriers of the system in average channel capacity analysis. Gaussian approximation method is employed to model multiuser interference (MUI) which mostly degrades the system performance. Hence, probability density function (PDF) of the instantaneous signal to interference noise ratio (SINR) is derived using Characteristic Function (CF) based method. Therefore, the exact closed form expression for the average channel capacity is derived by taking the expectation of Shannon channel capacity over the PDF of SINR. The results reveal that the average channel capacity of the MIMO OMC DS-CDMA system outperforms that of the conventional OMC DS-CDMA system. Similarly, we observe that MIMO MC DS-CDMA system has better spectral efficiency. Thus, we confirm the numerical results using Monte Carlo simulation technique.
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