A New Uplink Multiple Access Based on OFDM With Low PAPR, Low Latency, and High Reliability
A New Uplink Multiple Access Based on OFDM With Low PAPR, Low Latency, and High Reliability
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DOI：
10.1109/tcomm.2018.2792486
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发表时间：
2018-01
影响因子：
8.3
通讯作者：
Yuta Hori;H. Ochiai
中科院分区：
文献类型：
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作者：
Yuta Hori;H. Ochiai
提出了一种基于正交频分复用（OFDM）的上行链路多址物理层结构。它旨在以固定的解码器延迟实现高可靠性，目标是紧急的低延迟无线应用，例如机器对机器（M2M）和设备对设备（D2D）通信中的控制信息传输。我们提出的系统是基于子载波跳频和超正交卷积码的明智组合，以实现高编码增益和频率分集，以及Golay互补序列的低峰均功率比（PAPR）信令。低PAPR性质提高了功率放大器（PA）处的功率效率，从而有助于传输范围的增强。此外，通过向多个用户分配相同的子载波集合来引入用户之间的非正交性，可以提高总体频谱效率。为了抑制多址干扰所造成的非正交重叠的用户，多用户检测（MUD）。理论表达式的近似比特错误率的建议系统与MUD也开发。数值结果表明，我们提出的系统实现了更高的可靠性和更高的频谱效率比传统的正交频分多址（OFDMA）为基础的系统。
This paper proposes a new physical layer architecture based on orthogonal frequency-division multiplexing (OFDM) for uplink multiple access. It aims at high reliability with fixed decoder latency targeting emergent low-latency wireless applications, such as transmission of control information in machine-to-machine (M2M) and device-to-device (D2D) communications. Our proposed system is based on the judicious combination of subcarrier hopping and super-orthogonal convolutional codes for achieving high coding gain and frequency diversity, together with Golay complementary sequences for low peak-to-average power ratio (PAPR) signaling. The low PAPR nature improves the power efficiency at a power amplifier (PA) and thus contributes to the transmission range enhancement. Furthermore, by introducing non-orthogonality among users through the assignment of the same set of subcarriers to multiple users, the overall spectral efficiency can be improved. In order to suppress multiple access interference caused by the non-orthogonal overlap of users, multiuser detection (MUD) is employed. Theoretical expressions of approximate bit error rate for the proposed system with MUD are also developed. Numerical results reveal that our proposed system achieves higher reliability and higher spectral efficiency than the conventional orthogonal frequency-division multiple access (OFDMA)-based system.