The Distributed Antenna System (DAS) is a network of multiple antennas distributed in a building dedicated to providing wireless indoor coverage. Such a system can be either an active system or a passive system.
A passive DAS system is a network of coaxial cables, couplers, and power splitters (for distributing RF signals to individual antennas in a building). Passive DAS systems use leaky coaxial cables instead of discrete antennas. The use of leaky coaxial cables or discrete antennas usually depends on the building structure and installation conditions.
Active DAS systems typically employ optical signal distribution techniques that convert the RF signal of the RBS into an optical signal by a local interface unit. These optical signals are then distributed over fiber optic cables to a plurality of remote units, which in turn convert them back to RF signals. An antenna or coaxial cable small distribution network is connected to each remote unit to cover each floor.
Passive DAS systems have many advantages over other systems. For example, passive DAS systems have lower initial investment and higher reliability. Especially when 3G arrives, as a broadband system, the passive DAS solution is also very suitable for multi-operator and multi-service systems, including all types of wireless services, such as trunked mobile communication systems, cellular systems and speeds up to 2.5. GHz wireless local area network (WLAN). Since the coverage requirements for wireless broadband vary from one building to another, the passive solution can cover different systems according to the coverage requirements of different buildings, avoiding large-scale non-selectivity. Coverage for system and power losses. Because of this, most of the existing complex indoor coverage systems are passive DAS solutions.
Many advantages of DAS systemsThe DAS system provides operators with a more efficient indoor coverage solution than small, distributed indoor base stations (pico RBS). For example, it can increase the number of trunks on the wireless interface and the transmission link, so each wireless link is readily available anywhere in the building. This in turn increases spectrum efficiency and allows operators to respond to peak communications. RBS only needs one transmission line to cover the entire building. This not only greatly improves the transmission relay efficiency, but also reduces the transmission overhead of each RBS. In addition, the DAS solution also allows operators to control and limit coverage within the building to reduce interference with the macro cellular network, thereby increasing the total capacity of the network.
In addition, DAS is an efficient solution for providing indoor coverage for WCDMA. In this solution, multiple buildings or indoor areas share the same RBS. This RBS is connected to an optical signal distribution system that converts the RF signals into optical signals that are then distributed over fiber to the various buildings. The high-power optical remote unit in each building is responsible for converting the optical signal back to the RF signal and then distributing the signal to each location in the building through a coaxial cable antenna network. The benefits of deploying a DRS solution include increasing capacity by increasing the number of trunks, reducing transmission costs, and reducing the investment cost of the wireless access network.
In addition, the DAS solution increases the number of relays for wireless interfaces and transmission links, thereby increasing spectral efficiency because each wireless channel is readily available in every relevant building. Not only that, but the full capacity of the RBS can be used in any building or location, allowing operators to more easily cope with local traffic peaks (for example, when users eat lunch at a restaurant, or when they are sheltering from the rain).
Reducing transmission costs is also a major feature of DAS solutions, and operators can use statistical multiplexing to reduce transmission costs. Many users share the same transmission path and converge on the same site, because in many places, the lease cost of dark fiber is relatively low. Because macro sites share macro RBS with dedicated indoor coverage sites, the overall cost of a DRS solution is lower than other solutions compared to other similar solutions. It will enable operators to invest less in wireless access networks.
At present, Ericsson has adopted DAS solutions in many indoor and outdoor indoor coverage projects. It has also been applied in large-scale applications and 2G and 3G indoor coverage projects since 1999. Ericsson's DAS solution demonstrates Ericsson's leadership in this area during the network design phase. Ericsson's powerful network design capabilities, we will consider indoor and outdoor signals unified, minimize interference between indoor and outdoor networks, so that a limited indoor coverage to achieve the best use, maximize the use of network equipment, reduce investment.
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