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Smart Q-band millimeter Wave Point-to-point high-speed wireless Communication System: How to build pure and high-quality communication signals?

Because of the three advantages of high transmission rate, large working bandwidth and wide available space, millimeter wave technology is becoming a new round of focus of industrial chain layout.




Recently, based on customer orders and market demands, Junchi Group has recently developed a Q-band point-to-point high-speed communication system working in the 42.2-43.4GHz frequency band. This system has attracted much attention from the industry because it is suitable for fixed wireless access, base station /WiFi backtransmission, uncompressed data transmission, vehicular communication and many other scenarios. What are the characteristics of Q-band? What is the impetus to the development of millimeter wave industry?


Mining for “gold” bands in millimeter waves


At present, digitalization and intelligence have become the key driving forces of economic and social development, leading a new round of industrial transformation. From connecting people to connected objects, from the connection of life scene to the connection of production scene, connection is the premise and foundation of intelligent world.


And in order to achieve the “thousands of mbit rate, large capacity, wide coverage and low latency” 5 g of vision, the operators generally adopted “under 6 GHz + millimeter wave” 5 g deployment strategy, make full use of high, medium and low frequency deployment of 5 g, in the spectrum to achieve the balance of network coverage and capacity, and the millimeter wave can provide thousands of mbit rate and large capacity.


Compared with the frequency band below 6 GHz, millimeter wave frequency band has rich spectrum resources and great advantages in carrier bandwidth, which can achieve large bandwidth transmission of 400 MHz and 800 MHz. Through co-construction and sharing between different carriers, ultra-high rate data transmission can be achieved. At the same time, the length of the millimeter wave, the size of the required components is small, convenient for the integration and miniaturization of equipment products, in line with the mainstream demand of the current terminal market.


Millimeter wave is known to enable a wide range of use cases. If more than 80% of mobile data traffic in indoor scene, this brought development opportunities for millimeter wave indoor deployment, mobile operators the millimeter wave frequency spectrum can be used for indoor deployment, indoor millimeter-wave private network to enterprise, venues and transportation hub and indoor environment bring thousands of mbit rate, low time delay and great capacity.


At the same time, millimeter wave and the network below 6 GHz cooperate with each other, which can make full use of the potential massive spectrum resources to provide the maximum capacity layer and support the extremely high speed. The use of millimeter wave frequency band has become the general trend of wireless communication system evolution and development.


From a macro point of view, millimeter wave refers to the electromagnetic wave with a frequency between 30 GHz and 300 GHz, which is named for its wavelength in the millimeter level. Among them, Q-band refers to the frequency band between 33 and 50 GHz, which can be deployed in outdoor scenes due to its low atmospheric attenuation. It is suitable for a wide range of applications such as fixed wireless access, base station /WiFi backtransmission, uncompressed data transmission, vehicle-ground communication, etc., and the rich spectrum range can also achieve more application bearing, which can be said to be the “golden” frequency band in millimeter wave.


At present, with the release of relevant documents such as the Notice on the Issue of the Frequency Use of the Point-to-point Wireless Access System in the Fixed Service of the 40-50 GHz Band and the Notice on the Issue of the Frequency Use of the Broadband Wireless Access System in the Mobile Service of the 40-50 GHz Band by the Ministry of Industry and Information Technology, and led by Southeast University, The wireless local Area Network (WLAN) communication standard developed by China has been approved and recognized by IEEE. The standard conforms to the relevant regulations of the Ministry of Industry and Information Technology on Q-band broadband wireless access. It supports wireless access within a limited area around 45 GHz. It can support the signal modulation bandwidth up to 540 MHz continuous bandwidth, so that China has opened the Q-band spectrum, a brand new industrial ecology is really forming.


Xiao Kecheng, deputy general manager of Junzhi Group and chief technology officer of millimeter wave, pointed out that the opening of the Q-band spectrum means that in the near future and the next 10 years, China’s short-range high-speed communication applications will be more likely to expand in the Q-band, Q-band industry is also rising.


To create pure and high quality communication signals


As a national “little giant” enterprise, Junzhi Group has been committed to providing customers with millimeter wave technology solutions for a long time, and the developing Junzhi Millimeter Wave is a component, subsystem and solution supplier in the field of RF, microwave and millimeter wave, with technologies and products spanning the 2-110GHz frequency domain. Including up and down frequency converters, frequency doublers, mixers, solid state switches, power dividers, filters, waveguide coaxial converters and Doppler radar antennas, etc., dedicated to the service of millimeter wave 5G mobile communication, antenna testing, microwave laboratory, car driving assistance and rail transit speed measurement and other fields.


In terms of talents, the engineer team with the combination of the old, the middle and the young has the mechanical and electrical modeling design ability and 3D full-wave electromagnetic simulation ability necessary for high-frequency electronic design. The professional millimeter wave production and research room is equipped with advanced equipment such as vector network analyzer, spectrum analyzer, signal source and precision gold wire bonding machine in the full frequency domain. The performance of dozens of 18-50 GHz broadband products developed for 5G millimeter wave has been leading the domestic and international level.


Take the Q-band millimeter-wave point-to-point high-speed wireless communication system launched this time as an example. This system is A pair of transceivers with two different positions. The transceiver A will up-convert the baseband digital signal to the Q-band phase-locked carrier and transmit it through a pair of polarized horn antennas at 42.2-42.4GHz frequency. The MMwave signal is received by the transceiver B in another place through the same polarization of its horn antenna, and then sent to the baseband for processing after down-conversion; In the same way, the communication between the opposite transceiver B and A is also completed at the frequency of 43.2-43.4GHz and the other polarization direction of the dual-polarized horn antenna.




Notable is, Q band millimeter-wave point-to-point two transceiver high-speed wireless communication system using the same height of this vibration in combination with different frequency transceiver architectural design, with modular and hybrid integrated transceiver front-end way divided into millimeter-wave transceiver module, phase-locked frequency source module, the intermediate frequency and channel switching module, power supply and signal processing module the four modules.


At the same time, both the transmitting and receiving links adopt primary up and down frequency conversion architecture, and the IF signal is 1.5GHz ± 100MHz. The 10.2 GHz/11.2 GHz lock signal generated by PLL is provided to the corresponding fundamental mixer as the local oscillator power after quadruple frequency amplification. The AGC loop of the IF module increases the dynamic range of the receiver. The Q-band communication system of Junzhi technology adopts dual-polarized horn antenna to realize transceiver polarization isolation. The subtle filter scheme achieves excellent transceiver mirror frequency and spurious suppression and reduces local vibration leakage. In addition, the local oscillator signal is better than -86 dBc/Hz@1KHz, -94 dBc/Hz@10KHz and -103 dBc/Hz@100KHz phase noise, which ensures the purity and high quality of the communication signal spectrum.


As a result, more than 20 dBm transmitter power and receiver noise coefficient of less than 5 dB, and more than 20 of the class: : dBi double polarization of the horn antenna gain coupled with superior to 30 dB isolation, makes the delicate light Q band high-capacity high-speed communication systems are widely applied in distance from several meters to hundreds of meters long distance point-to-point communication application requirements.


In Xiao Kecheng’s opinion, Q-band MMW point-to-point high-speed wireless communication system works in the MMW Q-band with rich spectrum resources, which can achieve large capacity high-speed communication. The spectrum allocation architecture of the system can suppress the image, harmonics and spurious, and has strong anti-interference. It is easy to deploy and apply, and the system structure is simple. It is an extensible basic and simple system.


Also because of excellent product advantage, good to know this year only 5 g Internet of things, such as millimeter wave output value of the new product in the first half year-on-year growth to reach 95.32%, especially in the field of 5 g communication millimeter wave radio frequency device implements the key technical breakthrough, research and development production of 10 new product effectively replace the same type products imports, break the foreign monopoly, To provide Chinese solutions for millimeter wave development.


Tamp the 6G technical direction


In June this year, at the 96th meeting of 3GPP RAN just concluded in Budapest, Hungary, the R17 standard was officially frozen and the R18 project was basically completed. R18 will be the first version of 5G-Advanced protocol, which will also promote the rapid development of 5G and even 6G.




It is reported that 5G-Advanced will expand the three services defined by the original 3GPP and add three new service types, namely uplink ultra-wide band (UCBC), broadband real-time interaction (RTBC) and communication convergence sensing (HCS). The network capability will be enhanced by 10 times, including uplink capability, delay capability and positioning accuracy.


However, MMW has the characteristics of wider spectrum resources, higher spatial isolation, narrower beams, and more accurate beam collaboration, which will make it easier to achieve flexible upstream and downstream time slot matching and greatly improve positioning and sensing capabilities, so as to meet the needs of large uplink and communication fusion sensing services.


In fact, with the advent of 5G-Advanced era, 6G has become the focus of technological innovation in the global mobile communication industry. Compared with 5G, 6G will further expand from serving people, people and things to supporting the efficient interconnection of intelligent agents, realize the transition from the interconnection of everything to the intelligent connection of everything, become a link connecting the real physical world and the virtual digital world, and promote the transformation and upgrading of social production mode.


Currently, the main industry to explore 6 g core technology has advanced modulation coding, a new waveform, a new type of duplex and enhanced wireless hollow technology such as large size antenna based on wireless endogenous intelligence technology of artificial intelligence, intelligent super surface, smart new physical dimension wireless transmission technology, such as holographic radio terahertz communication, visible spectrum using new technologies such as optical communications, Communication-aware integration technology, 6G green and low-carbon technology, and distributed network architecture, computation-aware network, deterministic network, intelligent simple network, star-earth integrated network, network endogenous security and other new network technologies.


It can be seen that in the rapid iteration cycle of 5G and even 6G, millimeter wave will become the main development direction of the global communication industry.


Looking back, the launch of Junchi Q-band millimeter wave point-to-point high-speed wireless communication system not only lays a solid foundation for exploring the 6G demand vision and new technical direction, but also shows the determination of win-win cooperation with the industry and the responsibility of the national special new “little giant” enterprise.