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Nujira shows full ET efficiency benefit for TD-LTE PAs

19 Feb 2014

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Nujira Ltd reported that it has successfully delivered the full efficiency benefits of Envelope Tracking (ET) in TD-LTE mode for the first time. The test results demonstrated that its high bandwidth 20MHz NCT-L1300 ET modulator chip achieved twice the energy saving for RF power amplifiers (PAs) operating in TD-LTE mode compared to lower bandwidth ET solutions.

According to Nujira, its Coolteq technology is the only solution on the market that can unlock the full performance benefits of ET at the high bandwidths demanded by TD-LTE networks.

For handset OEMs and chipset vendors, TD-LTE presents a significant challenge as handsets are only able to transmit for a fifth of the time. For a given amount of data therefore, the transmit bandwidth and power has to be five times higher than FD-LTE, increasing transmit power by 7dB. The effect of this is to double the instantaneous current consumed by the RF PA during transmit bursts. Nujira's analysis of TD-LTE network statistics shows that half of the PA energy consumption is at high power/high bandwidth.

ET is crucial for reducing the peak power consumption, so the most significant power savings from ET can only be achieved by solutions that can support these higher bandwidths in ET mode. Lower performance ET solutions have to fall back to Average Power Tracking (APT) mode at high bandwidths, eliminating the performance advantage of ET and complicating the software development for chipset vendors.

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