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首页> 外文期刊>IEEE Transactions on Communications >Improving the Spectral Efficiency of Nonlinear Satellite Systems through Time-Frequency Packing and Advanced Receiver Processing
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Improving the Spectral Efficiency of Nonlinear Satellite Systems through Time-Frequency Packing and Advanced Receiver Processing

机译：通过时频打包和先进的接收器处理提高非线性卫星系统的频谱效率

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摘要

We consider realistic satellite communications systems for broadband and broadcasting applications, based on frequency-division-multiplexed linear modulations, where spectral efficiency is one of the main figures of merit. For these systems, we investigate their ultimate performance limits by using a framework to compute the spectral efficiency when suboptimal receivers are adopted and evaluating the performance improvements that can be obtained through the adoption of the time-frequency packing technique. Our analysis reveals that introducing controlled interference can significantly increase the efficiency of these systems. Moreover, if a receiver which is able to account for the interference and the nonlinear impairments is adopted, rather than a classical predistorter at the transmitter coupled with a simpler receiver, the benefits in terms of spectral efficiency can be even larger. Finally, we consider practical coded schemes and show the potential advantages of the optimized signaling formats when combined with iterative detection/decoding.
机译：我们考虑基于频分复用线性调制的宽带和广播应用的现实卫星通信系统，其中频谱效率是主要优点之一。对于这些系统，我们通过使用一个框架来计算采用次优接收器时的频谱效率，并评估通过采用时频打包技术可以获得的性能改进，从而研究其最终性能极限。我们的分析表明，引入受控干扰可以显着提高这些系统的效率。此外，如果采用能够解决干扰和非线性损伤的接收器，而不是采用与更简单的接收器耦合的发射器处的经典预失真器，则频谱效率方面的收益会更大。最后，我们考虑了实用的编码方案，并展示了与迭代检测/解码结合使用时优化信令格式的潜在优势。

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