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Interference Reduction in fading environment using Multistage Multiuser Detection Techniques

机译：使用多级多用户检测技术减少衰落环境的干扰

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摘要

Direct Sequence Code Division Multiple Access (DS-CDMA) system is one of the multiple access technique. Multiple Access Interference (MAI) is a major problem in DS-CDMA system caused by its users. When the number of users increases the MAI is also increases, hence the system performance gradually decreases especially in fading environment. In this paper, the interference is reduced in fading environment by using multiuser detection methods were introduced to detect the users data in presence of MAI. Multistage Multiuser Parallel Interference Cancellation (PIC) and Partial Parallel Interference Cancellation (PPIC) methods are introduced, which gives good system performance that means no.of stages increases the MAI gradually decreases but computational complexity is raised. The computational complexity is minimized by using Multistage Difference PIC (DPIC) detection method is introduced based on the convergence nature of interference cancellation, but system performance cannot be improved. Finally, Multistage Multiuser Partial Differencing Parallel Interference Cancellation (PDPIC) method is proposed in fading environment (combination of Difference PIC and Partial PIC). By using method, system performance is improved and computational complexity is minimized both are performed at a time. Simulation results shows that the PDPIC better performed (in terms of Bit Error Rate (BER)) than PIC and PPIC in fading environment.
机译：直接序列码分多次访问（DS-CDMA）系统是多种接入技术之一。多次访问干扰（MAI）是其用户引起的DS-CDMA系统中的一个主要问题。当用户数量增加时，MAI也会增加，因此系统性能逐渐降低，特别是在衰落环境中。在本文中，通过使用多用户检测方法，减少了衰落环境中的干扰，以检测Mai存在的用户数据。介绍了多级多用户并行干扰消除（PIC）和部分并行干扰消除（PPIC）方法，这为良好的系统性能提供了良好的系统性能，这意味着阶段的数量增加逐渐降低，但提出了计算复杂性。通过使用多级差异照片（DPIC）检测方法基于干扰消除的收敛性，但无法提高计算复杂性，但不能提高系统性能。最后，在衰落环境中提出了多级多用户部分差异平行干扰消除（PDPIC）方法（差分照片和部分照片的组合）。通过使用方法，系统性能得到改善，并且每次执行计算复杂性都是最小化的。仿真结果表明，PDPIC更好地执行（根据误差率（BER））而不是衰落环境中的PPIC。

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