Method of automatic gain correction for down going channel
An automatic correction and channel gain technology, applied in the direction of transmission control/equalization, etc., can solve problems such as long adjustment time, correction oscillation, and affecting the quality of NodeB transmitted signals, and achieve the effect of maintaining stability and reducing overhead
Inactive Publication Date: 2008-05-07
江苏杰创企业管理有限公司
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Problems solved by technology
When the gain value G deviates from the target gain value Gt by a large amount, for example, when a new RF board is replaced or the NodeB is just started, the gain value G will change suddenly. The adjustment time is long, which affects the quality of the NodeB transmitted signal; and when the gain value G deviates from the target gain value Gt very small, it may cause correction oscillation, such as when 0<(G-Gt)<0.1, or -0.1<(G- When Gt)<0, the adjustment of the fixed step size of 0.1 may cause G to oscillate in a small range, resulting in continuous adjustment of the gain and increasing the unnecessary overhead of the system
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[0033] The core idea of the present invention is: the system calculates the current power gain value according to the output power of the radio frequency board and the power amplifier, and calculates the current step size according to the current gain value, the target gain value, the amplification factor of the power amplifier and the minimum input increment of the power amplifier. If the current step size is equal to zero, no gain adjustment will be made; otherwise, compare the current gain value with the target gain value: if the current gain value is less than the target gain value, the output frequency of the RF board will be positively adjusted according to the current step size and sent to the power amplifier ; If the current gain value is greater than the target gain value, then negatively adjust the output frequency of the RF board according to the current step size and send it to the power amplifier. When calculating the current step size, the method takes into acco...
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The method determines current step value dynamically by rounded multiple values of difference value between current gain value and target value over adjustment precision. The step value obtained practically in each time is as adjustment quantity. Thus, gain correction for down going channel is completed by once. In condition of small change, not quite large change, or large change of gain for down going channel, the dynamic gain correction mode for down going channel in variable step value can complete gain correction quickly within shortest time. The invention also keeps stability of gain so as to reduce spending for adjusting gain for down going channel sostenuto.
Description
technical field [0001] The invention relates to a gain control technology, in particular to a method for automatically correcting the gain of a downlink channel. Background technique [0002] In order to ensure that the base station (NodeB) can output a relatively stable maximum downlink power, the system sets a target gain value. When the difference between the downlink channel output power and input power, that is, the gain value between the downlink channel output power and input power deviates from When the target gain value is reached, the downlink channel gain needs to be corrected so that the gain value between the output power and the input power remains at the target gain value level, so as to ensure the stability of the NodeB output power. [0003] The downlink channel includes the radio frequency board (NTRX), the wiring on the backplane, here refers to the connection line between the radio frequency board and the backplane, the power amplifier (NLPA), the duplexe...
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IPC IPC(8): H04B7/005
Inventor 詹东华
Owner 江苏杰创企业管理有限公司