arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2501.04307cs.ITmath.IT
收藏

具有自错误检测与重试解码的有限维格码

Finite Dimensional Lattice Codes with Self Error-Detection and Retry Decoding

Jiajie Xue, Brian M. Kurkoski

AI总结:

针对有限维格码中最优系数仍可能解码失败的问题,本文提出带 CRC 嵌入式物理层错误检测的重试解码方案,并应用于单用户与 CF 中继,显著降低 WER。

摘要:

当维数 $N \rightarrow \infty$ 时,采用最优解码系数的格码可达到容量。在通信系统中,人们考虑有限维格码,此时即使 $R<C$,最优解码系数仍可能解码失败。本文提出一种用于有限维基于格码传输的新型重试解码方案。当检测到解码错误时,允许接收机调整解码系数的取值并重试解码,而不是立即请求重传,因为后者会导致高时延。该方案同时被用于点到点单用户传输以及采用无功率约束中继的计算转发(CF)中继,借此实现比采用最优系数的传统一次性解码更低的字错误率(WER)。文中给出了一种称为 CRC 嵌入式格/格码的格/格码构造,用以提供物理层错误检测,从而支持重试解码。对于 CF 中继,文中给出了一种成形格设计,使解码器能够检测来自 CF 线性组合的错误,而无需获取各个用户的消息。数值结果表明,对于采用 128 维和 256 维格码、优化 CRC 长度且总共进行 2 次解码尝试的 2 用户 CF 中继,在错误概率 $10^{-5}$ 时,增益分别最高可达 1.31 dB 和 1.08 dB。

英文摘要:

Lattice codes with optimal decoding coefficient are capacity-achieving when dimension $N \rightarrow \infty$. In communications systems, finite dimensional lattice codes are considered, where the optimal decoding coefficients may still fail decoding even when $R< C$. This paper presents a new retry decoding scheme for finite dimensional lattice-based transmissions. When decoding errors are detected, the receiver is allowed to adjust the value of decoding coefficients and retry decoding, instead of requesting a re-transmission immediately which causes high latency. This scheme is considered for both point-to-point single user transmission and compute-forward (CF) relaying with power unconstrained relays, by which a lower word error rate (WER) is achieved than conventional one-shot decoding with optimal coefficients. A lattice/lattice code construction, called CRC-embedded lattice/lattice code, is presented to provide physical layer error detection to enable retry decoding. For CF relaying, a shaping lattice design is given so that the decoder is able to detect errors from CF linear combinations without requiring individual users' messages. The numerical results show gains of up to 1.31 dB and 1.08 dB at error probability $10^{-5}$ for a 2-user CF relay using 128- and 256-dimensional lattice codes with optimized CRC length and 2 decoding trials in total.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑