System pilot design method compatible with wimax and channel estimation method based on the pilot
A channel estimation and channel technology, which is applied in the field of channel estimation based on the pilot frequency, can solve the problems of low resource utilization efficiency and inability to meet user needs, and achieve the effect of enhancing robustness and adapting accurately
Inactive Publication Date: 2011-12-07
XUZHOU MASTER MECHANICAL TECH CO LTD
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Problems solved by technology
[0003] The technical problem to be solved by the present invention is to provide a pilot insertion method to solve the problem that the existing pilot insertion method has low resource utilization efficiency and cannot meet user needs
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example 1
[0041] Figure 4 Shown is a schematic diagram of channel estimation using the method of the present invention, if the common pilots are arranged according to the subcarrier positions of 1, 3, 5, ..., and the dedicated pilots are arranged according to 1, 5, 9, 13, ... ., then the prediction of the channel from common pilot to user-specific pilot time period can be obtained in odd positions (there are user-specific pilots at 1, 5, and 9), thus using this prediction to predict The channel of the user zone in the even position. Channels at other positions are interpolated by using the estimation results of positions 1 to 8 obtained just now.
[0042]The present invention uses this public pilot and the user-specific pilot to jointly complete the channel estimation advantage: (1) there is no new public pilot overhead; Adaptation will be more accurate; (3) The robustness of channel estimation is enhanced.
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The invention relates to a pilot frequency design method for an evolution system of a compatible microwave access global intercommunication WiMAX system. The method is as follows: lead codes of the WiMAX system are used as common pilot frequencies; special pilot frequencies are interpolated according to users; and different users interpolate the special pilot frequencies according to set interpolation proportions. The invention also provides a channel estimation method under the pilot frequency means. The method is as follows: firstly, each receiver utilizes the pilot frequencies to perform channel estimation on subcarrier positions which are provided with common pilot frequencies or special pilot frequencies; prediction rules of a channel in a time slice from the common pilot frequencies to the special pilot frequencies are measured and calculated by utilization of estimation results on positions which are not only provided with the common pilot frequencies but also provided with the special pilot frequencies; prediction is performed on subcarriers between every two predicted value positions by utilization of rules of the two predicted values, and channel estimation of subcarriers in an user area is obtained; or channel estimation values of the user area are predicted on subcarrier positions which are only provided with the common pilot frequencies according to the prediction rules; and channel estimation values of other subcarriers are obtained through interpolation by utilization of the predicted channel estimation values and the obtained estimation results.
Description
technical field [0001] The present invention relates to the field of wireless communication, in particular to a method for designing common pilots and dedicated pilots of a wireless system based on same-frequency compatible IEEE802.16e (WiMAX, Global Interoperability for Microwave Access) and channel estimation based on the pilots method. Background technique [0002] Based on smooth evolution and the needs of operators, it will inevitably involve the development of a more advanced new wireless communication system on the existing system. This problem is reflected in the new system design that is compatible with the original system at the same frequency. figure 1 Shown is a schematic diagram of the frame structure of a compatible WiMAX system. The existing system usually places a Preamble (preamble) at the frame header, and inserts a dedicated pilot into each OFDM symbol. Such a design often cannot meet the needs of modern systems: for high-speed mobile users, the pilot fr...
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IPC IPC(8): H04L25/02H04L1/06
Inventor 张学林
Owner XUZHOU MASTER MECHANICAL TECH CO LTD
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