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首页> 外文会议>28th AIAA international communications satellite systems conference 2010 >Preamble based Adaptive Beamformer for Hybrid Terrestrial-Satellite Mobile System
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Preamble based Adaptive Beamformer for Hybrid Terrestrial-Satellite Mobile System

机译：混合卫星地面移动系统的基于前同步码的自适应波束形成器

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摘要

Convergence behaviour of beamforming in interference mitigation application is critical to overall system performance. In non-blind beamforming, the resources utilised to reach the steady state impacts the overall throughput. Traditionally in the downlink of Orthogonal Frequency Division Multiplexing (OFDM) based systems, a preamble formed of training sequence is transmitted prior to data for the purpose of channel estimation. While enabling superior estimation, the approach compromises on data throughput. On the other hand in the uplink, a preamble approach for channel estimation is not applicable due to interference issues. For beamforming, however, preamble transmission for the uplink becomes viable for improved detection performance. In this paper we propose a pilot reallocation based preamble solution for beamforming where dispersed pilots from OFDM symbols are reallocated to form a preamble at the transmission end. This preamble, transmitted prior to data OFDM symbols, guarantees faster convergence without affecting data throughput. Extending our previous work, we employ this solution in Hybrid Terrestrial Satellite Mobile System (HTSMS) with a channel model specific to the mobile-satellite scenario in order to yield practical results. We also study the impact of the preamble's pilot density and its length on beamformer's convergence behaviour and overall performance of HTSMS.
机译：缓解干扰应用中波束成形的收敛行为对于整个系统性能至关重要。在非盲波束成形中，用于达到稳态的资源会影响整体吞吐量。传统上，在基于正交频分复用（OFDM）的系统的下行链路中，出于信道估计的目的，在数据​​之前发送由训练序列形成的前同步码。在实现出色的估算的同时，该方法在数据吞吐量上有所妥协。另一方面，在上行链路中，由于干扰问题，用于信道估计的前导方法不适用。然而，对于波束成形，用于上行链路的前同步码传输对于改善检测性能变得可行。在本文中，我们提出了一种针对波束成形的基于导频重新分配的前导解决方案，其中，将来自OFDM符号的分散导频进行重新分配，以在传输端形成前导。在数据OFDM符号之前发送的此前同步码可确保更快的收敛速度，而不会影响数据吞吐量。为了扩展我们以前的工作，我们在混合地面卫星移动系统（HTSMS）中采用了该解决方案，该解决方案具有专用于卫星移动场景的信道模型，以便产生实际结果。我们还研究了前导码的导频密度及其长度对波束形成器的收敛行为和HTSMS总体性能的影响。

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