This paper proposes an iterative detection and decoding (IDD) scheme and an approach to improve the selection of access points (APs) in uplink cell-free massive multiple-antenna systems. A cost-effective scheme for selection of APs based on local log-likelihood ratios (LLRs) is developed that provides sufficient statistics to the central processing unit and selects which APs should be considered for each user. {Numerical results show that the proposed IDD scheme works very well and the proposed LLRs-based approach to select APs outperforms the existing techniques in terms of bit error rate and spectral efficiency while requiring a comparable fronthaul load.

翻译：本文提出了一种迭代检测与译码（IDD）方案，以及一种改进上行无小区大规模多天线系统中接入点（APs）选择的方法。我们开发了一种基于本地对数似然比（LLRs）的成本效益型接入点选择方案，该方案为中央处理单元提供充分统计量，并确定每个用户应考虑哪些接入点。数值结果表明，所提出的IDD方案表现良好，且基于LLRs的接入点选择方法在误码率和频谱效率方面优于现有技术，同时所需的前传负载相当。