无小区无授权随机接入的收发器设计
Transceiver Design for Cell-Free Unsourced Random Access
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中文总结 AI 辅助
针对无小区无授权随机接入问题，提出含OMP导频检测、MMSE符号估计、SIC等的低复杂度高能效收发器，其性能优于现有方案，增益最高达4.5 dB，可容纳1800个活跃用户。
中文摘要 AI 辅助
针对无小区无授权随机接入（URA），我们提出了一种低复杂度、高能效的解决方案，其中多个分布式接入点通过前传链路连接到中央处理单元。假设每个用户发送一个导频序列，随后是一个极化码（polar code）码字，其符号根据开-关模式放置在帧的数据部分，我们利用迭代译码，包括基于正交匹配追踪（OMP）的导频检测与信道估计、采用线性最小均方误差（MMSE）方案的符号估计、符号合并、单用户译码以及连续干扰消除（SIC）。我们还给出了有限块长（FBL）性能分析和详细的复杂度分析。数值结果表明，FBL分析能恰当表征系统性能，且所提出的无小区URA方案相比现有低复杂度方案具有更优性能，具体而言，其性能增益最高可达4.5 dB，且能容纳多达1800个活跃用户。
英文摘要
We propose a low-complexity, energy-efficient solution for cell-free unsourced random access (URA), in which multiple distributed access points are connected to a central processing unit via a fronthaul. Assuming that each user transmits a pilot sequence followed by a polar codeword whose symbols are placed to the data part of the frame according to an on-off pattern, we utilize iterative decoding, including orthogonal matching pursuit (OMP)-based pilot detection and channel estimation, symbol estimation using a linear minimum mean square error (MMSE) solution, symbol combining, single-user decoding, and successive interference cancellation (SIC). We also present finite blocklength (FBL) performance and detailed complexity analyses. Numerical results demonstrate that the FBL analysis properly characterizes system performance and that the proposed cell-free URA scheme offers superior performance compared to existing low-complexity schemes. Namely, it offers a superior performance of up to 4.5 dB and can accommodate up to 1800 active users.
