SFN中用于数字广播的代数混合星地空时码
Algebraic Hybrid Satellite-Terrestrial Space-Time Codes for Digital Broadcasting in SFN
摘要：
最近，用于在单频网络（SFN）中广播未来数字电视的不同方法已经处于深入研究之下。为了改善传输以覆盖郊区和农村地区，可以使用混合方案。在混合传输中，信号既从卫星又从地面站点传输。2008年，Y. Nasser等人提出在数字电视的混合4 × 2 MIMO传输中使用双层3D空时（ST）码。本文针对4 × 2混杂系统提出了结构更简单的替代码，并针对3 × 2混杂系统构造了新的码。通过计算机模拟分析了所提出的码的性能，显示出比简单的重复方案有显着的改善。此外，建议的代码证明是非常强大的存在下，两个站点之间的功率不平衡。
英文摘要：
Lately, different methods for broadcasting future digital TV in a single frequency network (SFN) have been under an intensive study. To improve the transmission to also cover suburban and rural areas, a hybrid scheme may be used. In hybrid transmission, the signal is transmitted both from a satellite and from a terrestrial site. In 2008, Y. Nasser et al. proposed to use a double layer 3D space-time (ST) code in the hybrid 4 x 2 MIMO transmission of digital TV. In this paper, alternative codes with simpler structure are proposed for the 4 x 2 hybrid system, and new codes are constructed for the 3 x 2 system. The performance of the proposed codes is analyzed through computer simulations, showing a significant improvement over simple repetition schemes. The proposed codes prove in addition to be very robust in the presence of power imbalance between the two sites.
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