Dynamic channel allocation and spatial feature extraction and wave beam forming method
A technology for spatial feature extraction and dynamic channel allocation, which is applied in the field of OFDM transmission systems and can solve problems such as difficulty in using smart antennas
Inactive Publication Date: 2009-09-16
BEIJING XINWEI TELECOM TECH
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[0005] The purpose of the present invention is to provide a dynamic channel allocation and spatial feature extraction and beamforming method in a data transmission system, to solve the difficult problem that the system similar to WiMAX channel allocation is difficult to use smart antennas, and the channel allocation method is simultaneously Retains the advantages of WiMAX channel allocation, such as low delay, suitable for multi-user scheduling, etc.
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[0047] The implementation of the present invention in the OFDMA system will be specifically described below in conjunction with the accompanying drawings.
[0048] Figure 1 shows the channel allocation method of WiMAX: the uplink and downlink of each frame of WiMax are allocated through UL_MAP and DL_MAP respectively, and the downlink is in front and the uplink is in the back, so it is difficult to adopt smart antenna technology.
[0049] figure 2 Shown is the channel allocation method of the present invention: the channel allocation method of the present invention is dynamic allocation, and the uplink and downlink channels are allocated at the same time, and the uplink is before the downlink. In the figure, MAP is channel allocation indication information, which is broadcast signaling. The same MAP information indicates to users that the uplink and downlink channels are divided into two frames, and the uplink is in front of the downlink. The advantage of this allocation is th...
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The present invention provides a method for dynamic channel allocation, spatial feature extraction and beamforming in a data transmission system, comprising: (1) the base station assigns an uplink channel and a corresponding downlink channel to a terminal at the same time through MAP broadcast signaling; (2) the terminal After analyzing the MAP broadcast signaling, the uplink signal is sent to the base station; (3) the base station uses the uplink signal of the terminal to perform channel estimation and spatial feature extraction; (4) the base station uses the spatial feature to perform beamforming on the uplink and downlink signals. The present invention solves the problem that it is difficult for a system similar to WiMAX channel allocation to use smart antennas, and the channel allocation method also retains the advantages of WiMAX channel allocation, such as small delay and suitable for multi-user scheduling.
Description
technical field [0001] The invention relates to a method for channel allocation, spatial feature extraction and beam forming in a wireless communication system, especially in an OFDM transmission system. Background technique [0002] Smart antenna technology is used in both SCDMA and TD-SCDMA systems. The downlink beamforming of SCDMA uses the spatial characteristics of the uplink signal of the previous frame, while the downlink beamforming of TD-SCDMA can use the space characteristics of the uplink signal of this subframe. spatial features. However, in a burst transmission system (such as WiMAX), because channels are allocated per frame, and the allocation of uplink and downlink is asymmetrical (assigning a downlink channel to a user does not mean that an uplink channel is allocated to it at the same time), it is similar to It is difficult to use the beamforming of smart antennas in a channel distribution system such as WiMAX. [0003] The research on spatial feature extr...
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IPC IPC(8): H04Q7/38H04W72/12H04B7/06H04L25/02H04L27/26
Inventor 肖业平路鹏叶威
Owner BEIJING XINWEI TELECOM TECH