Samsung have achieved the feat of integrating four receiving antennas to be able, in some cases, double the rates in 4G download. What to allow full use of the Snapdragon modem X12 present in the US version of the Galaxy Note 7
the modem Snapdragon Qualcomm X12 is the first mobile modem to support the 4 × 4 MIMO, technology to double the rates in 4G reception through the use of four antennas in the smartphone against two antennas usually. As we saw in the presentation of this modem, this technology allows to increase throughput and coverage without the operators may need to add additional frequencies or install new software. The only thing to do on their own is to update their infrastructure to spend 2 × 2 MIMO 4 × 4 MIMO. Good news, since the MIMO 4 × 4 has just made its first commercial appearance in the new Galaxy Note 7.
The information comes to us Reddit, since a user has posted a photo showing the Galaxy services menu Note 7. We can then see the line “Test mode 4RxD” appear, which means that the terminal supports, at least in theory, MIMO 4 × 4 and therefore includes four antennas physical for receipt of 4G against two or even one antenna in conventional devices. In practice, the Galaxy Note 7 however seems to be limited to 2 × 2 MIMO, but an OTA update firmware could help enable additional two antennas.
More = more antennas rates
The presence of four active antennas bring many benefits . in the case where the operator’s base station is not compatible with the MIMO 4 × 4, the flow would still be higher (between 5 to 15%). If the smartphone is connected to a base station MIMO 4 × 4, the benefits are even more interesting: download speeds that can be doubled, improved energy efficiency and thus lower consumption of the modem to perform the same tasks and a stronger signal . with an OTA update, Samsung could also enable the 256 QAM modulation to increase 33% rates without adding antennas or additional frequencies.
600 Mbps in France?
If we take the example of France, it would be possible to move to 600 Mbps at all four french operators, only with 4 × 4 MIMO infrastructure and operation of four different frequency bands. It would then be possible to exceed this speed by adding the QAM 256. To further increase once the flow, it will then implement the aggregation of four carriers, as provided Snapdragon Qualcomm modem X16 able to approach 1000 Mbps.
Snapdragon 820 vs Exynos 8890
Unfortunately, only the Galaxy Note 7 version Snapdragon 820 seems compatible with the 4 × 4 MIMO since the Exynos 8890 of the European version includes a modem class 12, but appears to be limited to 2 × 2 MIMO . Samsung he will take the risk of activating the four antennas at the risk of highlight cell performance Snapdragon 820 chip facing his house? The future will tell
Read on FrAndroid: Samsung Galaxy Note 7: Performance the Exynos 8890 in competition
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