Channel estimation system and method

A channel estimation and signal technology, applied in multi-frequency code systems, baseband system components and other directions, can solve the problem of large channel estimation system errors, and achieve the effect of ensuring accuracy, improving system performance, and improving accuracy

Active Publication Date: 2012-08-22
合肥东芯通信股份有限公司
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Problems solved by technology

[0022] In view of this, the present invention provides a channel estimation system and method to solve the problem of large errors in the channel estimation system in the prior art, and the technical solution is as follows:

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  • Channel estimation system and method

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Embodiment Construction

[0063] First, the channel estimation system provided by the embodiment of the present invention is described, including:

[0064] A power adjustment unit, configured to adjust the power of the received signal to a preset range suitable for sampling;

[0065] a sampling processing unit, configured to sample and process the power-adjusted signal;

[0066] a timing unit, configured to perform synchronous timing adjustment on the sampled and processed signal;

[0067] a frequency offset compensation unit, configured to correct the frequency offset of the signal adjusted by the synchronous timing;

[0068] A fast Fourier transform unit, configured to perform fast Fourier transform on the frequency offset corrected signal to obtain OFDM symbols in the frequency domain;

[0069] a buffer unit, configured to buffer the OFDM symbols in the frequency domain and wait for processing;

[0070] The channel estimation mode determination unit is used to select the continuous mode when the ...

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Abstract

The invention discloses a channel estimation system and a channel estimation method. In the invention, according to the detection of sudden changes in a signal in a system signal processing process, the channel estimation is divided into two modes: a continuous mode and a discontinuous mode. When no sudden change in the signal is detected, the continuous mode is selected, the last two orthogonal frequency division multiplexing symbols of a previous frame are interpolated by using a reference signal of a later frame and a reference signal of the previous frame while the interpolation effect isguaranteed; and when a sudden change in the signal is detected, the discontinuous mode is selected and the channel at the positions of the last two orthogonal frequency division multiplexing symbols is estimated by only using the reference signal of the previous frame, so the channel errors caused by the sudden change in the signal are avoided. Therefore, the channel estimation system provided bythe embodiment of the invention can improve the accuracy of the channel estimation on the basis of giving the high performance of the continuous channel estimation into a full play.

Description

technical field [0001] The present invention relates to the technical field of broadband wireless communication, in particular to a channel estimation system and method. Background technique [0002] The Long Term Evolution system (LTE, Long Term Evolution system) is widely regarded as a quasi-4G wireless communication system. It has a transmission rate of 100M downlink and 50M uplink, and supports higher mobile speed (350km / h) and larger cells Coverage radius (100 km), support 200 users per cell online at the same time. In addition, LTE also has flexible bandwidth configuration (1.4M~20M), supports multimedia broadcasting services and end-to-end quality of service (QoS, Quality of Service) and other characteristics. Therefore, LTE is also considered to be the development direction of future mobile communication and the candidate standard of 4G technology. [0003] A typical LTE frame structure such as figure 1 with figure 2 as shown, figure 1 It is frequency division ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L27/26
Inventor 张国松吴齐发唐相国
Owner 合肥东芯通信股份有限公司
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