Uplink multi-user code field pilot channel estimating system

A pilot channel and multi-user technology, applied in the field of data communication, can solve problems such as co-channel interference and low complexity, and achieve the effect of improving anti-interference performance and complexity performance

Inactive Publication Date: 2008-05-14
ZTE CORP
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Problems solved by technology

[0004] There are two main problems in the design of channel estimation: one is the selection of pilot information, due to the time-varying nature of the wireless channel, the receiver needs to track the channel continuously, so The pilot signal must also be continuously transmitted; the second is the design of a channel estimator with low complexity and good pilot tracking ability
[0007] In the frequency domain orthogonal pilot scheme, since the pilots between different users in the same cell are completely orthogonal, when there are many users in the same cell, the performance Relatively good, but the co-channel interference at the edge of the cell is serious

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  • Uplink multi-user code field pilot channel estimating system
  • Uplink multi-user code field pilot channel estimating system
  • Uplink multi-user code field pilot channel estimating system

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Embodiment Construction

[0043] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0044] Figure 1-A is the block diagram of the code-domain pilot channel estimation system for the single-user system; Figure 1-B It is a block diagram of the code-domain pilot channel estimation system of the multi-user system.

[0045] Such as Figure 1-A and Figure 1-B As shown, the upper part is the transmitter that transmits the pilot signal that is orthogonal to the code domain, and the lower part is the receiver that receives the pilot signal that is orthogonal to the code domain.

[0046] figure 2 It is a block diagram of the subframe structure of the DFT-S OFDM system.

[0047] Such as figure 2 As shown, in the DFT-S OFDM system, a complete frame structure includes 20 subframes of 0.5ms, and each subframe is composed of 6 Long Blocks and 2 Short Blocks, where the ShortBlock is used to transmit reference signals, Long Block is ...

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Abstract

The invention discloses an uplink multi-user code domain pilot channel estimation system. An training sequence generator is used for generating an M point pilot sequence and then transmitting the M point pilot sequence to a framing module; the framing module receives the pilot sequence demodulated by the DFT-S OFDM demodulation module and assembled into a sub-frame for transmitting to the antenna to send out; the frame decomposition module is used for carrying out a sub-frame decomposition to the time domain signal received by the antenna and obtaining the time domain pilot signal of the code domain orthogonality separated from the sub-frame signal; the DFT-S OFDM demodulation module is used for modulating the received time domain pilot signal and transmitting to the channel estimation interference elimination module; and the channel estimation interference elimination module is used for wiping out a multi-user interference and a multi-path interference, and outputting a user domain or frequency domain channel responding.

Description

technical field [0001] The invention relates to a data communication technology, in particular to an uplink multi-user code domain pilot channel estimation system of a DFT-SOFDM system in 3GPP LTE. Background technique [0002] In wireless communication, the acquisition of channel information is very important, almost all practical wireless communication systems use some form of channel estimation technology without exception. Adaptive channel equalizer uses channel information to counteract the influence of ISI; diversity technology uses channel estimation to achieve a receiver that best matches the received channel signal; maximum likelihood detection minimizes errors at the receiving end through channel estimation. Another important benefit of channel estimation is that it enables correlated demodulation. Therefore, channel estimation is an essential and important part in any wireless communication system. [0003] Channel estimation is divided into blind channel estima...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L27/26
Inventor 张峻峰郁光辉
Owner ZTE CORP
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