In cell-free massive MIMO networks, an efficient distributed detection algorithm is of significant importance. In this paper, we propose a distributed expectation propagation (EP) detector for cell-free massive MIMO. The detector is composed of two modules, a nonlinear module at the central processing unit (CPU) and a linear module at the access point (AP). The turbo principle in iterative decoding is utilized to compute and pass the extrinsic information between modules. An analytical framework is then provided to characterize the asymptotic performance of the proposed EP detector with a large number of antennas. Simulation results will show that the proposed method outperforms the distributed detectors in terms of bit-error-rate.

翻译：在无细胞大型MIMO网络中,高效分布式检测算法非常重要。在本文件中,我们建议为无细胞大型MIMO提供一个分布式预期检测器。检测器由两个模块组成:中央处理器的非线性模块(CPU)和接入点的线性模块(AP),在迭代解码中采用涡轮原则来计算和传递各模块之间的外部信息。然后提供一个分析框架,以便用大量天线来描述拟议的EP探测器的无药可治性性性能。模拟结果将显示,拟议的方法在比特机率方面超过了分布式探测器。