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首页> 外文期刊>IEEE Transactions on Communications >Calculating LLRs via Saddlepoint Approximation in Front-End MIMO Receivers
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Calculating LLRs via Saddlepoint Approximation in Front-End MIMO Receivers

机译:通过前端MIMO接收器中的鞍点近似计算LLR

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In this work, we consider the front-end receivers for flat fading MIMO transmission, whose essential feature is the calculation of the log-likelihood ratios (LLRs) for the transmitted bits. When the number of transmit antennas and the modulation size grow, the exact calculation of the LLRs becomes unfeasible due to the necessity to enumerate the symbols affecting the output. In this work, to avoid the burden of explicit enumeration, instead of calculating the likelihoods exactly, we explore the possibilities offered by the saddlepoint approximation of the likelihood functions. The resulting fixed-complexity approach significantly outperforms the well known linear-filter based minimum mean square error detection. A complexity analysis identifies the main computational bottleneck of the proposed detection algorithm.
机译:在这项工作中,我们考虑用于平坦衰落MIMO传输的前端接收器,其基本特征是计算所传输比特的对数似然比(LLR)。当发射天线的数量和调制大小增加时,由于需要枚举影响输出的符号,因此无法准确计算LLR。在这项工作中,为了避免显式枚举的负担,而不是精确地计算似然度,我们探索似然函数的鞍点近似所提供的可能性。产生的固定复杂度方法明显优于基于线性滤波器的最小均方误差检测。复杂度分析确定了所提出的检测算法的主要计算瓶颈。

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