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Emitting method of pilot data, base station controller, channel evaluation method and apparatus

A channel estimation and pilot data technology, applied in the directions of space transmit diversity, multi-frequency code system, diversity/multi-antenna system, etc., can solve the problems that affect the performance of channel estimation, affect the system efficiency, and the pilot cannot track the channel, etc.

Inactive Publication Date: 2010-05-05
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In the above-mentioned prior art, the pilots used by different transmitting antennas occupy different time-frequency subcarrier resources. On the one hand, if the density of the pilot subcarriers of the fixed system (that is, the Overhead of the pilot remains constant), the As the number of antennas increases, the pilot density used by each antenna will decrease, so that the pilots cannot track channel changes, which will affect the performance of channel estimation and ultimately affect the efficiency of the system; on the other hand, as the number of antennas increases, if To ensure the channel estimation performance of each antenna (that is, the pilot density of each antenna is constant), the pilot density of the system will increase (the corresponding pilot Overhead will increase), which will also affect the efficiency of the system
[0013] In addition, in the above prior art solutions, since the pilots are too scattered in the frequency domain, the ability of the pilots to track the channel delay extension is reduced, which will also affect the performance of channel estimation

Method used

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  • Emitting method of pilot data, base station controller, channel evaluation method and apparatus
  • Emitting method of pilot data, base station controller, channel evaluation method and apparatus
  • Emitting method of pilot data, base station controller, channel evaluation method and apparatus

Examples

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Effect test

no. 1 example

[0122] In this embodiment, the distribution of pilot OFDM symbols and data OFDM symbols on a regular time domain is used as the pilot allocation mode, and each transmitting antenna adopts the same pilot allocation mode. A specific implementation of this mode is as follows Figure 9 As shown in the figure, n data OFDM symbols are included between two adjacent pilot OFDM symbols.

[0123] The pilot OFDM symbol can be the same length as the data OFDM symbol, or it can be different in length; like the usual OFDM symbol, the pilot OFDM symbol and the data OFDM symbol are also composed of a data part and a cyclic prefix part, and the cyclic prefix part is composed of the data part. End loop generation.

[0124] Specifically, the structure of the pilot OFDM symbol is as follows Figure 10 Shown: the number of sampling points occupied by the cyclic prefix part of the data OFDM symbol is N p，cp , the number of sampling points occupied by the data part is N p，data .

[0125] The str...

no. 2 example

[0166] This embodiment is not limited to the above regular distribution of pilot OFDM symbols and data OFDM. In the case of irregular pilot OFDM symbols and data OFDM distribution, each transmitting antenna adopts the same pilot allocation mode. The regular distribution of pilot OFDM symbols and data OFDM is as follows Figure 15 Shown:

[0167] In the case of the above-mentioned irregular distribution of pilot OFDM symbols and data OFDM symbols, the relationship between the transmit symbols of different transmit antennas on the pilot subcarriers is the same as that of the first embodiment.

[0168] The distribution mode of the pilot OFDM symbols in this embodiment is suitable for the situation where the channel changes slowly, and corresponds to the distribution of the above-mentioned pilot OFDM symbols, refer to Figure 16 , the corresponding receiver channel estimation can be realized by the following steps:

[0169] Step 31, obtaining channel information in the time doma...

no. 3 example

[0175] In this embodiment, it is not limited to the pilot allocation mode of the above-mentioned pilot OFDM symbols. In the case of the pilot allocation mode of the pilot grid point, each transmitting antenna adopts the same pilot allocation mode, which is applicable to a kind of pilot allocation mode of the present invention. Situational pilot grid points such as Figure 17 Shown:

[0176] In the case of the pilot allocation pattern of the pilot grid, the relationship between the transmission symbols of different transmission antennas on the pilot subcarriers is the same as that of the first embodiment.

[0177] refer to Figure 18 , the specific channel estimation process of the receiver suitable for the above-mentioned pilot allocation mode of the time-frequency plane includes the following steps:

[0178] Step 41, separating the frequency domain reception signal of the subcarrier where the pilot frequency is located from the received frequency domain reception signal;

...

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Abstract

The invention provides a pilot data transmission method in the multi-transmission antenna orthogonal frequency-division multiplexing system, and it uses different transmission antennas to transmit pilot data on the same pilot model, the various transmission antennas having different symbols in pilot sub-carrier waves. Additionally, the invention also discloses a corresponding base station controller and the channel estimation method and device in the multi-transmission antenna orthogonal frequency-division multiplexing system. In the invention, since the different transmission antennas reusespilot resources, even the number of transmission antenna increasing, the pilot sub-carrier wave density used by the system remains unchanged, thus enhancing the actual channel estimation performance in the orthogonal frequency division multiplexing system.

Description

technical field [0001] The present invention relates to Orthogonal Multiplex Frequency Division Multiplexing (OFDM) technology, more precisely to a pilot data transmission method, base station controller, channel estimation method and device in a multi-transmission antenna OFDM system. Background technique [0002] OFDM technology is a frequency division multiplexing technology capable of transmitting high-speed data services. On the one hand, compared with traditional single-carrier technology, OFDM technology can provide higher spectrum efficiency by using a simple equalization algorithm; on the other hand, in In a system using OFDM, there is no need to allocate a wide guard bandwidth between adjacent carriers like traditional frequency division multiplexing (FDM), so that mutual interference between subcarriers can be avoided, thereby saving bandwidth. . [0003] At present, OFDM technology has been widely used in existing communication systems, and this technology has b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L1/06H04B7/04
Inventor 党淑君
Owner HUAWEI TECH CO LTD
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