Power Combining Networks for MIMO Transmission

用于 MIMO 传输的功率组合网络

• 批准号: 1256548
• 负责人: Andrea Goldsmith
• 金额: $ 26.52万
• 依托单位: Stanford University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-02-01 至 2015-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1256548&HistoricalAwards=false
• 关键词: Power; Combining; Networks; MIMO; Transmission

This research studies the use of power combining in multi-antenna radios. Modern radio systems often use multiple transmit antennas and appropriate signal coding to improve throughput and reliability of wireless links. Ideally, each amplifier should be rated at the maximum total (or sum) power that can be transmitted from all antennas. Due to cost and efficiency considerations, the power rating is usually designed to be lower (typically the maximum total power divided by the number of antennas), and this can lead to significant performance loss. This research explores a solution using Power Combining Networks (PCN) that enable the output of an amplifier to be switched/combined into any antenna, thus moving power from a weaker to a stronger antenna, resulting in improved link performance.The maximum output power of a MIMO (Multiple Input, Multiple Output) antenna transmitter is limited due to bio-safety considerations. MIMO transmission performs best when each power amplifier is rated at the full system transmit power. If the amplifiers are fractionally rated due to cost and efficiency considerations, the worst case loss with M antennas can reach log M dB in the presence of channel imbalances. A PCN can reduce this loss significantly, trading the loss of array gain for a better channel coupling efficiency. Use of a PCN alters the effective MIMO channel and therefore can also change the optimum transmit coding. The goal of this research is to study fast algorithms for PCN selection, appropriate signal coding schemes and the best realizable performance.

这项研究研究了在多腹膜收音机中使用功率组合的使用。现代无线电系统通常使用多个传输天线和适当的信号编码来提高无线链接的吞吐量和可靠性。理想情况下，每个放大器的额定值应以最大总（或总和）功率为单位，该功率可以从所有天线传输。由于成本和效率的考虑，功率等级通常被设计为较低（通常是最大总功率除以天线数量），这可能会导致大量的性能损失。这项研究探索了使用电源组合网络（PCN）的解决方案，该解决方案使放大器的输出能够被切换/组合到任何天线，从而将功率从较弱的天线移动到更强的天线，从而提高了链路性能。链接性能提高了MIMO（多重输入，多输出）天线递质的最大输出功率，因此由于生物安全考虑而受到限制。当每个功率放大器以完整的系统传输功率评估时，MIMO传输的性能最佳。如果由于成本和效率考虑因素而对放大器的分数额定评分，则在频道失衡存在下，M天线的最坏情况下的损失可能会达到Log M db。 PCN可以大大减少这一损失，以更好的频道耦合效率来交易阵列增益的损失。使用PCN会改变有效的MIMO通道，因此还可以更改最佳的发送编码。这项研究的目的是研究用于PCN选择，适当的信号编码方案和最佳可实现性能的快速算法。