qpsk modulation

As one of the most hot access technology, wireless access technology by the operators, especially the new operators generally optimistic, the national radio Regulatory agencies also issued a specific frequency planning, it is evident that everyone to this technology attention and optimistic degree. 　　 According to the frequency planning of the national Radio Regulatory Agency, our frequency division is basically based on European standards. Within the limited 30MHz bandwidth, if the 1.75MHz band

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at a transmission rate of up to 22 Mbit/s with a single-carrier bandwidth of 6 MHz, the spectrum efficiency is high. The communication probability in the 90% GHz band can reach 80%, and the communication probability in the GHz band can reach more. A high-frequency microwave SDHIP ring system. In the past, many microwave SDH devices were used in point-to-point microwave transmission circuits. Now with the advancement of technology, some companies have launched microwave SDH Bidirectional Ring Ne

Optical fiber requirements for G and G Systems With the rapid development of data communication and interconnection networks, network point-to-point, online applications, and video services have all experienced explosive growth. Massive digital media content has led to a rapid increase of 10 or even times of Internet traffic, this results in 50% ~ The speed of 80% is growing rapidly. At present, the GB system has been commercially used by major carriers. The GB system can further increase t

relay transmission circuits. Now with the progress of technology, some companies have introduced a microwave SDH two-way ring network, with self-healing function, and fiber ring self-healing characteristics of the same, integrated ADM, using a serialized modem, realize QPSK-256QAM programmable, there are a variety of interfaces (g.703, STM-1, E3/t3, E1, Ethernet 10base-t/100base-t). At the same time, the engineering installation of miniaturized struc

companies have introduced the microwave SDH bidirectional ring network, with self-healing function, and the self-healing characteristics of the fiber ring, integrated with ADM, using a series of modems, to achieve QPSK-256QAM programmable, there are a variety of interfaces (g.703, STM-1, E3/t3, E1, Ethernet 10base-t/100base-t). At the same time, the construction of miniaturized structure equipment is more convenient than the previous microwave equipm

Cable Modem is developed in recent years, mainly for CATV network data transmission. Most new cable networks now use fiber-optic coaxial hybrid (HFC) networks, and their huge bandwidth and relative economics make them attractive to cable companies and newly established telecoms companies. Because cable modem is a kind of equipment that provides data service on HFC network, it is usually equated with HFC broadband access technology. Using 64QAM technology, Cable Modem can provide 30mbit/s downli

according to the channel condition. This allows WiMAX to have a greater coverage and a higher access rate. For example, when the channel condition is good, the modulation mode can be adjusted to 64QAM, and the coding efficiency of the channel is higher, the transmission rate is increased, the maximum transmission rate of WiMAX can reach 75mbit/s; when the channel transmission condition is bad, the base station cannot establish the connection based on