With the rapid evolution of wireless technology, the network transmission performance of smartphones is expected to increase significantly. It is reported that the 802.11ac mobile phone chip supporting 2&TImes; 2 MIMO (Multiple Input Multiple Output) antenna, and the 4&TImes; 4 LTE MIMO antenna solution have been launched, breaking the performance limitation of the previous mobile phone using 1&TImes;1 MIMO antenna, which can reduce system power consumption And signal interference problems.
New antenna solution improves mobile communication quality
In general, the method of improving the data transmission performance of mobile phones is nothing more than expanding the bandwidth and increasing the antenna. However, for mobile phone manufacturers, it is necessary to accommodate two or four sets of MIMO antennas in a very compact and limited space. It is almost impossible to separate the distances to avoid signal interference, which also leads to important reasons for the lack of significant improvement in the quality of mobile communications.
Not only that, in addition to 3G or LTE antennas, GPS, Wi-Fi and Bluetooth antennas must be imported inside the phone, which further compresses the design space. Therefore, due to lack of space, it becomes the biggest obstacle to restrict the introduction of MIMO antennas into mobile phones and optimize the performance of mobile communication.
In this regard, wireless device vendors have developed iMAT (Isolated Mode Antenna Technology) technology, which can effectively isolate interference between different antennas, and automatically identify different radio frequency (RF) signals for optimal processing, and then assist the system. Manufacturers shorten the distance between the antennas to achieve layout flexibility and space efficiency on the printed circuit board.
In the 2014 MWC exhibition, a solution supporting 4&TImes; 4 LTE MIMO antennas has emerged to support the LTE-Advanced dual-band carrier aggregation architecture, which will increase the mobile mobile communication transmission rate to 600 Mbps. At the same time, the tri-band carrier aggregation scheme has also been in the process of development.
At the same time, the mobile Wi-Fi antenna layout is also facing the problem of tight space, so it is difficult to achieve a transmission rate of more than 1 Gbps for the new generation 802.11ac standard. Broadcom also uses Transmit Beamforming (TxBF) technology and advanced antenna and RF signal physical layer design to introduce an 802.11ac mobile solution that supports 2×2 MIMO architecture.
It is reported that 2×2 MIMO will double the Wi-Fi performance and save 25% of Wi-Fi signal transmission and power consumption compared to the current 1x1 MIMO architecture used by smartphones.
What is MIMO technology?
So what exactly is MIMO technology? Popularly speaking, it is a wireless technology that uses multiple antennas to synchronously transmit and receive wireless signals in order to improve the transmission quality of wireless signals. MIMO (Multi-input Multi-output) technology is defined in Wikipedia as an abstract mathematical model for describing multi-antenna wireless communication systems. It can transmit signals independently by multiple antennas at the transmitting end. The receiving end receives and restores the original information by using multiple antennas.
MIMO multi-input and multi-out wireless technology
Among the current mainstream 802.11n wireless products, the MIMO architecture is one of the iconic wireless technologies. In the field of wireless communication, the smart antenna technology in MIMO technology is of great significance, which can multiply the throughput, transmission distance and spectrum utilization of the communication system without increasing the bandwidth.
It should be said that a wireless communication system constitutes a wireless MIMO system as long as both its transmitting end and receiving end use multiple antennas (or antenna arrays). MIMO technology uses spatial multiplexing technology to process wireless signals. After multiple cuts, the data is converted into multiple parallel data substreams. The data substreams are synchronously transmitted through multiple antennas, and independent parallel channels are transmitted in the air to transmit these signal streams. In order to avoid the inconsistent signal being cut, multiple antennas are also received at the receiving end, and the separated signals are recombined according to the time difference factor to restore the original data.
The advantage of using MIMO technology is that the information substream can be transmitted by increasing the number of antennas, and multiple data substreams are simultaneously transmitted to the channel, and each transmitted signal occupies the same frequency band, thereby increasing the spectrum without increasing the bandwidth. Utilization rate. It has been tested that the spectrum utilization of WLAN using MIMO technology can reach 20-40bps/Hz, which is very suitable for wireless network systems in indoor environments.
In summary, after using MIMO technology, the transmission distance of the wireless signal and the acceptance range of the antenna can be further expanded, the signal anti-interference is stronger, and the wireless transmission is more accurate and faster. The new MIMO architecture antenna solution, which was launched to improve the communication quality of mobile phones in LTE or WiFi environments, has undoubtedly provided users with a smoother and faster wireless application experience.
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