Abstract:

In practical applications, estimation error, quantization error and feedback delay bring out imperfect perfect Channel State Information（CSI）. Particularly for a Vandermonde-subspace Frequency Division Multiplexing（VFDM） based two-tiered spectrum sharing system, a performance degradation evaluation of the macrocell is proposed based on the upper bound of rate loss when bounded channel estimation error is considered. It first derives the upper bound of interference leakage generated by the bounded error. Then, with the relationship between interference leakage and achievable system rate, it obtains the upper bound of rate loss. Finally, numerical results are presented to verify the correctness of the derivation and the upper bound of rate loss can better describe the system degradation with bounded channel estimation error.

Key words: channel estimation error, rate, upper bound, interference leakage

摘要：

考虑采用VFDM技术的二层频谱共享网络，针对实际应用中由于信道估计误差、量化误差、反馈时延等因素带来的非理想信道状态信息，提出了一种基于速率损失上界的信道估计误差有界时宏小区性能评估方案。推导了信道估计误差有界时干扰泄漏的上界，建立干扰泄漏与宏小区可达速率之间的关系，进而得到宏小区系统速率损失上界。给出了仿真结果验证推导的正确性，该上界很好地描述了范德蒙子空间频分复用系统在信道估计误差有界时的性能损失统计特性。

关键词: 信道估计误差, 速率, 上界, 干扰泄漏