ANALYSIS OF A SIMPLE SUCCESSIVE INTERFERENCE CANCELLATION SCHEME IN A DS-CDMA SYSTEM
ANALYSIS OF A SIMPLE SUCCESSIVE INTERFERENCE CANCELLATION SCHEME IN A DS-CDMA SYSTEM
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DOI：
10.1109/49.298053
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发表时间：
1994-06-01
影响因子：
16.4
通讯作者：
HOLTZMAN, J
中科院分区：
文献类型：
--
作者：
PATEL, P;HOLTZMAN, J
远近效应的补偿对于DS/CDMA系统的性能是至关重要的。到目前为止，实际系统已经使用功率控制来克服衰落和近/远效应。另一种方法是多用户检测和干扰消除，它不仅在消除近/远效应方面而且在大幅度提高容量方面具有基本潜力。各种最优和次优方案进行了研究。然而，这些方案中的大多数即使对于相对简单的系统也变得过于复杂，并且依赖于良好的信道估计。对于干扰消除，信道参数（即接收幅度和相位）的估计是重要的。我们分析了一个简单的连续干扰消除相干BPSK调制方案，其中的参数估计是使用线性相关器的输出。然后，我们扩展的非相干调制方案，即M元正交调制的分析。对于非相干的情况，所需的信息的幅度和相位从相关器的输出。研究了IC方案与多径分集合并沿着的性能。
Compensating for near/far effects is critical for satisfactory performance of DS/CDMA systems. So far, practical systems have used power control to overcome fading and near/far effects. Another approach, which has a fundamental potential in not only eliminating near/far effects but also in substantially raising the capacity, is multiuser detection and interference cancellation. Various optimal and suboptimal schemes have been investigated. Most of these schemes, however, get too complex even for relatively simple systems and rely on good channel estimates. For interference cancellation, estimation of channel parameters (viz. received amplitude and phase) is important. We analyze a simple successive interference cancellation scheme for coherent BPSK modulation, where the parameter estimation is done using the output of a linear correlator. We then extend the analysis for a noncoherent modulation scheme, namely M-ary orthogonal modulation. For the noncoherent case, the needed information on both the amplitude and phase is obtained from the correlator output. Performance of the IC scheme along with multipath diversity combining is studied.