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Pilot frequency transmission method for dual-user private flow

A transmission method and dual-user technology, applied in the field of pilot transmission, can solve the problems of destroying frequency domain, time domain channel correlation, reducing the accuracy of equivalent channel estimation, and large pilot overhead.

Active Publication Date: 2012-11-21
TD TECH COMM TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the pilots of Port5 are weighted by the array, which destroys the channel correlation in the frequency domain and time domain, a higher density of pilot symbols is required in the frequency domain and time domain to achieve accurate estimation of the equivalent channel.
If multiple user-specific streams need to be supported at the same time, a larger pilot overhead will be required, and if the pilot overhead is not increased, the estimation accuracy of the equivalent channel will be reduced

Method used

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  • Pilot frequency transmission method for dual-user private flow
  • Pilot frequency transmission method for dual-user private flow
  • Pilot frequency transmission method for dual-user private flow

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Embodiment Construction

[0047] In order to make the purpose, technical means and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0048] The basic idea of ​​the present invention is to reuse the pilot frequency on the current Port5 to transmit the pilot signal of two user-specific streams.

[0049] When two user-specific streams are to be transmitted, in order not to increase pilot overhead, it may be considered to reuse the pilot on Port5. Specifically, the pilot transmission method in the present invention is most basically:

[0050] Step 1. Divide the pilots of Port5 into two groups in units of occupied time resources, and the number of Port5 pilots included in the two groups is equal.

[0051] The specific grouping methods can include the following three types:

[0052] a. Group the Port5 pilots whose occupied time resources are the 4th and 7th OFDM symbols into one group, and group the Po...

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Abstract

The invention discloses a pilot frequency transmission method for dual-user private flow, which includes: the Port 5 pilot frequency is divided into two groups according to the occupied time resource, the number of Port 5 pilot frequency in each group is identical; one group of Port 5 pilot frequency is used for the pilot frequency transmission of the first user private flow, and the other group of Port 5 pilot frequency is used for the pilot frequency transmission of the second user private flow. By adopting the invention, the pilot frequency transmission of dual-user private flow is realized as the pilot frequency intensity is not increased.

Description

technical field [0001] The invention relates to the pilot frequency transmission technology of the user-specific channel by using the common pilot frequency in the communication system, in particular to a pilot frequency transmission method of dual user-specific streams. Background technique [0002] In the LTE pilot design, user-specific pilots are introduced to improve system capacity and quality by using airspace information. The user-specific data transmission method is to carry out array weighting at the transmitting end, form a directional beam for the direction of arrival, and form a lower gain for other directions. The receiving end needs to obtain the equivalent channel after array weighting for data demodulation. In the 3GPP LTE downlink, port 5 is opened for user-specific channel estimation. In the 3GPP LTE downlink, port5 for user-specific pilots starts from the fourth OFDM symbol At the beginning (the first 3 OFDM symbols are used for the control channel, and u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L25/03
Inventor 孙霏菲王大飞沈东栋赵渊
Owner TD TECH COMM TECH LTD