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The infringement action in Germany concerns three European patents covering fundamental DMR techniques such as multi-level quadrature amplitude modulation (M-QAM), synchronous digital hierarchy (SDH) radio and cross-polar interference cancellation ( Eclipse Quattro also introduced cross-polar interference cancellation (XPIC) to allow the same frequency to be re-used on a link, doubling the amount of carried traffic using a single frequency pair, to optimize the use of scarce frequency resources. The foundation for the Powerwave Clean Site single band antenna solution is the single band broadband antenna portfolio with cross-polar diversity that reduces the total number of antennas required. |
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