In this letter, an uplink space division multiple access scheme based on the Doppler effect is proposed for wireless multi-user communication systems. By rotating the receive antenna array or using a circular sampling method, different Doppler frequency shifts are introduced to the received signals from different directions, and then different user’s signal can be separated in frequency domain. To maximize the inter-user interference (IUI)-free bandwidth, a max-min criterion is proposed for antenna switching control. The main advantage of the proposed scheme over the conventional space division multiple access (SDMA) schemes is that it needs less number of analog receive chain. Then simulations are carried out to evaluate the performance of the proposed scheme in terms of channel capacity. Simulation results show that the proposed scheme achieves a significant capacity gain, and its capacity is very close to that of a single user system without IUI.

中文翻译：

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基于多普勒效应的上行空分多址技术

在这封信中，针对无线多用户通信系统提出了一种基于多普勒效应的上行空分多址方案。通过旋转接收天线阵列或采用圆形采样的方法，将不同的多普勒频移引入到不同方向的接收信号中，从而在频域上分离不同用户的信号。为了最大化无用户间干扰 (IUI) 的带宽，提出了用于天线切换控制的最大-最小准则。与传统的空分多址 (SDMA) 方案相比，所提出的方案的主要优点是它需要较少数量的模拟接收链。然后进行仿真以评估所提出方案在信道容量方面的性能。