基于延迟有限反馈的自适应比特分割多小区干扰置零
Adaptive Bit Partitioning for Multicell Intercell Interference Nulling with Delayed Limited Feedback
摘要：
基站协作可以在发射机处利用用户的信道状态信息（CSI）的知识来管理同信道干扰。用户必须使用有限带宽的回程链路来反馈期望信道和干扰信道的CSI。用于单小区有限反馈的现有码本设计可以通过在多个信道之间划分可用反馈资源来用于多小区协作。在本文中，提出了一种新的反馈比特分配策略，作为在通信链路中的延迟和在下行链路中的接收信号强度的函数。信道的时间相关性建模为一个函数的延迟使用高斯马尔可夫模型。推导了位划分的封闭形式表达式，以分配更多的位来分配具有较小延迟的较强通道，并分配较少的位来分配具有较大延迟的较弱通道，假设随机矢量量化。蜂窝网络模拟表明，该算法产生更高的和速率比等比特分配技术。
英文摘要：
Base station cooperation can exploit knowledge of the users' channel state information (CSI) at the transmitters to manage co-channel interference. Users have to feedback CSI of the desired and interfering channels using finite-bandwidth backhaul links. Existing codebook designs for single-cell limited feedback can be used for multicell cooperation by partitioning the available feedback resources between the multiple channels. In this paper, a new feedback-bit allocation strategy is proposed, as a function of the delays in the communication links and received signal strengths in the downlink. Channel temporal correlation is modeled as a function of delay using the Gauss-Markov model. Closed-form expressions for bit partitions are derived to allocate more bits to quantize the stronger channels with smaller delays and fewer bits to weaker channels with larger delays, assuming random vector quantization. Cellular network simulations are used to show that the proposed algorithm yields higher sum-rates than an equal-bit allocation technique.
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