误时对DS-UWB系统Rake接收机可重构信息速率的影响
Impact of Mistiming on the Achievable Information Rate of Rake Receivers in DS-UWB Systems
摘要：
在本文中，我们研究了误定时对直接序列超宽带（DS-UWB）系统中的Rake接收机的性能的影响，从可达到的信息速率的角度。由于误定时的性能退化的一般表达式推导。基于该表达式的Monte Carlo仿真结果表明，性能损失与目标可达信息速率关系不大，但与系统带宽和多径分集阶数有很大关系，反映了系统定时要求、带宽和实现复杂度之间的设计折衷。此外，Rake接收机的性能下降与不同的多径分量选择方案和合并技术进行了比较。在这些接收机中，广泛使用的最大比合并（MRC）选择性瑞克（S-Rake）在存在误定时时遭受最大的性能损失。
英文摘要：
In this paper, we investigate the impact of mistiming on the performance of Rake receivers in direct-sequence ultra-wideband (DS-UWB) systems from the perspective of the achievable information rate. A generalized expression for the performance degradation due to mistiming is derived. Monte Carlo simulations based on this expression are then conducted, which demonstrate that the performance loss has little relationship with the target achievable information rate, but varies significantly with the system bandwidth and the multipath diversity order, which reflects design trade-offs among the system timing requirement, the bandwidth and the implementation complexity. In addition, the performance degradations of Rake receivers with different multipath component selection schemes and combining techniques are compared. Among these receivers, the widely used maximal ratio combining (MRC) selective-Rake (S-Rake) suffers the largest performance loss in the presence of mistiming.
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