Method, system, base station and user's set for confirming diversity detention value of circulating detention

A cyclic delay diversity, user equipment technology, applied in the field of MIMO-OFDMA system, can solve the problem of how to design CDD, etc., to achieve the effect of ensuring system performance

Inactive Publication Date: 2008-05-07
NTT DOCOMO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, there is no method for how to design the delay value (group) of CDD in the existing codebook design method

Method used

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  • Method, system, base station and user's set for confirming diversity detention value of circulating detention
  • Method, system, base station and user's set for confirming diversity detention value of circulating detention
  • Method, system, base station and user's set for confirming diversity detention value of circulating detention

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] The embodiment of the present invention obtains the CDD delay value (group) in its own optimal precoding codebook through the receiving end, that is, the user equipment (UE), and feeds it back to the base station, and then the transmitting end, that is, the base station (BS) , according to the CDD delay value (group) in the optimal precoding codebook collected from each user equipment, select the CDD delay value (group) in the global precoding codebook to realize the precoding codebook Adaptive update of CDD delay value (group), so as to guarantee system performance to the greatest extent. Global here means that the CDD delay value (group) in the same group of precoding codebooks is applicable to all users. refer to figure 2 , in a multi-user scheduling MIMO-OFDMA system composed of a base station and several user equipments and applying a precoding technology combined with CDD, the method described in the embodiment of the present invention includes the following ste...

Embodiment 2

[0101] The present invention obtains its own channel feature information through the receiving end, that is, user equipment (UE), and then the sending end, that is, base station (BS), reasonably selects the global precoding codebook according to the collected channel feature information from each user equipment. The middle CDD delay value is used to realize the self-adaptive update of the CDD delay value in the precoding codebook, thereby guaranteeing the system performance to the greatest extent. refer to Figure 5 , in a multi-user scheduling MIMO-OFDMA system composed of a base station and several user equipments and applying a precoding technology combined with CDD, the method described in the embodiment of the present invention includes the following steps:

[0102] Step 1: The base station sends a start signal to the user equipment to start the update process of the CDD delay value (group) in the precoding codebook, or the user equipment periodically automatically starts...

Embodiment 3

[0138] The present invention obtains the CDD delay value in its own optimal precoding codebook through the receiving end, that is, the user equipment (UE), and then the transmitting end, that is, the base station (BS), according to the optimal CDD delay value collected from each user equipment The CDD delay value in the precoding codebook, select the optimal CDD delay value in the precoding codebook for each user to realize the adaptive update of the CDD delay value in the precoding codebook, and each user independently The CDD delay value in the precoding codebook is updated accurately, so as to guarantee the system performance to the greatest extent. refer to Figure 8 , in a multi-user scheduling MIMO-OFDMA system composed of a base station and several user equipments and applying a precoding technology combined with CDD, the method described in the embodiment of the present invention includes the following steps:

[0139] Step 1: The base station sends a start signal to t...

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Abstract

The present invention discloses a method, a system, a base station and a UE for confirming the cyclic delay diversity value. The present invention comprises the steps that the UE estimates the results according to the channel to obtain the optimum CDD delay value of the optimum channel which can be obtained, and feeds back the delay value to the base station; the base station chooses the optimum CDD delay value according to the received optimum CDD delay values from every user as the CDD delay value for the work of the system. With the method, system, base station and UE of the present invention, the adaptive renovation of the CDD delay value can be realized to ensure the system function to the maximum.

Description

technical field [0001] The present invention relates to MIMO-OFDMA (Multiple-Input Multiple-Output-Orthogonal Frequency Division Multiple Access) system, in particular, relates to the application in combination with CDD (Cyclic Delay Diversity, cyclic delay diversity) precoding (precoding) technology in MIMO-OFDMA system When performing multi-user scheduling, a method, system, base station and user equipment for determining CDD delay values ​​(groups) in a precoding codebook. Background technique [0002] With the wide application and continuous development of the MIMO-OFDMA system, initially, people introduced a precoding technology based on cyclic delay diversity to further improve the performance of the system. [0003] Precoding technology is an effective method that can improve system performance. The method can reduce the complexity of the receiving end and improve the system performance by preprocessing the signal at the sending end. Especially when the system works...

Claims

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Application Information

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IPC IPC(8): H04L1/06H04L1/00H04L25/03H04B7/06H04L27/26H04Q7/30
Inventor 刘竞秀佘小明陈岚
Owner NTT DOCOMO INC
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