新型高维SCMA码本设计及链路仿真性能数据集
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该数据集为大容量低时延接入协议与传输安全一体化研究报告中新型高维码本设计及超载率验证部分的实验数据。传统SCMA码本优化方案主要面向高斯信道和瑞利衰落信道模型进行设计，然而卫星通信环境呈现出独特的信道特征：首先，由于星地信道存在显著的直射径与非直射径共存现象，基于莱斯衰落的信道模型更能准确表征卫星信道统计特性；其次，相较于地面蜂窝网络，低轨卫星的小区覆盖半径可扩展至数百公里量级，致使覆盖区域内用户终端的路径损耗差异显著扩大。现有码本设计方案普遍将所有用户视为一个整体，并未充分考虑不同空间位置用户的路损差异，造成边缘用户与中心用户间的服务质量公平性失衡。因此，针对卫星信道环境复杂导致用户公平性和系统可靠性降低的问题，本课题形成了适配随机分布用户SCMA码本的2个小数据集：1. 在调制阶数为4、信噪比为14 dB、超载率为200%条件下采用所提方案生成SCMA码本，给出了所提SCMA码本的具体数值以及基准码本的具体数值；2. 在随机产生用户信道状态信息、不同信噪比条件下对所提码本与基准方案的系统可靠性进行仿真，给出了不同信噪比下各码本实现的系统误码率性能变化。上述两个小数据集于2024年12月在北京市石景山区静洋大厦520生成。其中，码本优化数据通过Matlab optimization toolbox中的GA函数求解非凸优化模型得到码本幅度参数、相位参数与功率分配参数，构建理论最优多用户码本；码本性能仿真数据通过模拟SCMA卫星通信系统，将接收端信号检测得到的结果与发送端的发送比特一一比对，计算得到不同信噪比条件下不同码本的误码率性能，将上述实验数据保存为文件。利用Matlab对原始数据进行处理，采用蒙特卡洛模拟法，计算多次仿真结果中对应接收信噪比条件下各码本平均性能，并在前端展示出来。
This dataset comprises experimental data from the section on novel high-dimensional codebook design and overload rate verification in the research report on integrated large-capacity low-latency access protocol and transmission security. Traditional SCMA codebook optimization schemes are primarily designed for Gaussian and Rayleigh fading channel models. However, satellite communication environments exhibit unique channel characteristics: first, satellite-ground channels have prominent coexisting line-of-sight (LOS) and non-line-of-sight (NLOS) components, so Rician fading-based channel models can more accurately characterize the statistical properties of satellite channels; second, compared with terrestrial cellular networks, the cell coverage radius of Low Earth Orbit (LEO) satellites can extend to hundreds of kilometers, significantly amplifying the path loss differences between user terminals within the coverage area. Existing codebook design schemes generally treat all users as a single entity, without fully considering the path loss differences of users at different spatial positions, leading to unfairness in quality of service (QoS) between edge and central users. Therefore, to address the issue of degraded user fairness and system reliability caused by the complex satellite channel environment, this study developed two small datasets for SCMA codebooks adapted for randomly distributed users: 1. Generate SCMA codebooks using the proposed scheme under the conditions of modulation order 4, signal-to-noise ratio (SNR) 14 dB, and overload rate 200%, and provide the specific values of both the proposed SCMA codebook and the baseline codebook; 2. Simulate the system reliability of the proposed codebooks and baseline schemes under different SNRs with randomly generated user channel state information (CSI), and provide the variation of system bit error rate (BER) performance achieved by each codebook under different SNRs. The above two small datasets were generated in December 2024 at Room 520, Jingyang Building, Shijingshan District, Beijing, China. Specifically, the codebook optimization data was obtained by solving the non-convex optimization model using the GA function in the Matlab Optimization Toolbox to derive the amplitude, phase, and power allocation parameters of the codebook, thereby constructing the theoretically optimal multi-user codebook; the codebook performance simulation data was obtained by simulating an SCMA satellite communication system, comparing the signal detection results at the receiver with the transmitted bits at the transmitter one-to-one, calculating the BER performance of different codebooks under different SNRs, and saving the above experimental data as files. The raw data was processed using Matlab, and the average performance of each codebook under the corresponding received SNR conditions from multiple simulation results was calculated using the Monte Carlo simulation method, which was then visualized for frontend display.
