43results about How to "Reduce the ping-pong effect" patented technology

The invention provides an automatic gain control (AGC) system and a method which has an adaptive reference and an adaptive threshold value. The adaptive reference allows the target power to be adjusted according to variation of the operation parameter and condition, such as the modulation mode changing for sustaining the performance with different Signal to Noise Ratio (SNR), while the adaptive threshold value allows a fast AGC response and reduces the delayed and potential impact. The invention has the advantage that the AGC level can be changed between the symbol prefix and the symbol suffix, but can not be changed during the data part of the signal. The embodiment provided allows the AGC to be changed according to each symbol in OFDM, OFDMA and TDD systems.

The embodiment of the invention discloses a vertical handover method and apparatus in a visible light and Femto heterogeneous network. According to a bankruptcy credit distribution model in a cooperative game and a size of each parameter of each network, a weight coefficient of service providing capacity corresponding to each parameter of each network is determined, and according to a current service type of a user, by applying an analytic hierarchy process, a weight coefficient of an importance degree of each parameter for the current user is determined; and according to the weight coefficients of the service providing capacity and the weight coefficients of the importance degrees, weight coefficients of comprehensive performance of two networks are determined, the network of which the comprehensive performance has a greater weight coefficient is used as a target network, and when a network currently accessed to is not the target network, the network is handed over to the target network. The apparatus comprises a monitoring module, a calculating module, a locking module, and a decision handover module. According to the vertical handover method and apparatus in the visible light and Femto heterogeneous network, which are disclosed by the invention, continuity of data transmission is ensured, a ping-pong effect caused by frequent handover is reduced, service requests of the user are homogenized, and channel resources are reasonably distributed.

The present invention claims to protect an intelligent access method for maximizing comprehensive benefits in a heterogeneous wireless network. In a heterogeneous wireless network, the current access algorithm has frequent access and lacks the problem of adjusting the access strategy according to the user's moving speed , propose an intelligent access algorithm for maximizing comprehensive benefits. First, calculate the user's maximum transmission rate according to the user's received signal strength and available bandwidth, and use it as the current benefit; secondly, use the prediction method to obtain the user's transmission rate at the next few moments, and combine it with a weight-decreasing method to use it as a long-term benefit. Benefits; finally, combine current and long-term benefits based on user movement speed. Experimental results show that the present invention can effectively reduce access times, improve system throughput, and adapt to user access with different moving speeds.

The invention relates to a method for reducing satellite communication system switching delay, in particular to a switching method for spot beams in the same gateway station of a geostationary orbit satellite. In the method, a switching position area is acquired by using the position information of a mobile terminal of a satellite communication system and combining historical measurement information; the possibly-spanned switching position area is pre-judged according to a navigation path; a velocity vector of the current mobile terminal is acquired by combining a digital map, if the time when the mobile terminal travels to the switching position area from the current position is less than a certain threshold value, pre-switching is completed and finally, switching confirmation is carried out through measurement. Through the adoption of the method, the satellite beam switching delay can be reduced greatly, and in addition, the switching ping-pong effect can be reduced.