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Used in CDMA. The notion of "good performance" can depend on context and may include optimizing metrics such as link data rate, network capacity, geographic coverage and range, and life of the network and network devices. Power control algorithms are used in many contexts, including cellular networks, sensor networks, wireless LANs, and DSL modems.Even in FDMA systems such as GSM where each user in a cell uses a different frequency, interference is still present between different cells and reduces the amount of frequency reuse the network can support. In wireline networks such as DSL, lines from many subscriber homes are often bundled together, and interference between signals on different lines manifests itself as crosstalk and reduces the achievable data rate to each home.
Posted by waqqas1
Power control, broadly speaking, is the intelligent selection of transmit power in a communication system to achieve good performance within the system. The notion of "good performance" can depend on context and may include optimizing metrics such as link data rate, network capacity, geographic coverage and range, and life of the network and network devices. Power control algorithms are used in many contexts, including cellular networks, sensor networks, wireless LANs, and DSL modems.
However using High power has the following disadvantage:
In cellular spread-spectrum systems such as CDMA, where users share a single frequency and are only separated by different spreading codes, the number of users that a cell can support as well as the size of the cell is typically limited by the amount of interference present in the cell; increased interference therefore results in decreased cell capacity and size. Even in FDMA systems such as GSM where each user in a cell uses a different frequency, interference is still present between different cells and reduces the amount of frequency reuse the network can support. In wireline networks such as DSL, lines from many subscriber homes are often bundled together, and interference between signals on different lines manifests itself as crosstalk and reduces the achievable data rate to each home.
Posted by hwhite
Basically two power control parameters are being used in CDMA digital operations:
1.)Forward link power control
A power control from BS to MS
2.)Reverse link power control
A power control from MS to BS
Posted by sagitraz
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