We study the problem of unsourced random access (URA) over Rayleigh block-fading channels with a receiver equipped with multiple antennas. We employ multiple stages of orthogonal pilots, each of which is randomly picked from a codebook. In the proposed scheme, each user encodes its message using a polar code and appends it to the selected pilot sequences to construct its transmitted signal. Accordingly, the received signal consists of superposition of the users' signals each composed of multiple pilot parts and a polar coded part. We use an iterative approach for decoding the transmitted messages along with a suitable successive interference cancellation scheme. Performance of the proposed scheme is illustrated via extensive set of simulation results which show that it significantly outperforms the existing approaches for URA over multi-input multi-output fading channels.
翻译:我们研究Rayleigh区块布局通道上无源随机存取的问题,该通道上装有一台装有多天线的接收器;我们采用多个阶段的正方形实验,每个阶段都随机地从代码簿中提取;在拟议的办法中,每个用户用极代码编码其信息,并将其附加到选定的试验序列中,以构建其传输信号;因此,收到的信号包括用户信号的叠加,每个信号由多个试点部件和极方编码部分组成;我们使用迭接方法解码传送的信息,同时采用适当的连续取消干扰方案;通过广泛的模拟结果显示,拟议办法的绩效大大超过现有铀拉动对多输出多输出流流流流流流的当前方法。