Channel estimation method and system based on regulating factor

An adjustment factor and channel estimation technology, applied in the field of wireless communication, can solve problems such as high transmission rate requirements, decreased system throughput, and inability to accurately track channel change states, so as to improve throughput, improve performance, and save pilot overhead Effect

Inactive Publication Date: 2009-03-11
ZTE CORP
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Problems solved by technology

[0004] The current wireless communication system has high requirements on the transmission rate. The problem of pilot overhead at the sending end directly affects the system throughput to a large extent. If the pilot overhead is too large, the system throughput will decrease, but if the overhead is too small, the Accurately tracking the changing state of the channel will also lead to a decrease in system throughput

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Embodiment Construction

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0030] Such as figure 1 As shown, the channel estimation system of this embodiment includes a sending end and a receiving end, and the related modules of the sending end mainly include a pilot setting module 1 and a pilot signal sending module 2, and the related modules of the receiving end mainly include sequentially connected The channel response estimation module 3, the first estimation unit 4, the correction module 5 and the second estimation unit 6, the sending end is connected to the channel response estimation module 3 of the receiving end through the pilot signal sending module 2, wherein:

[0031] sender:

[0032] The pilot setting module 1 is used for setting the pilot, including determining the interval of the pilot symbol in the subframe and the insertion position of the pilot sub-frequency wave in the pilot symbol.

[0...

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Abstract

The invention provides a channel estimating method and a system which are based on adjustment factors and used in an orthogonal frequency division multiplexing OFDM system. The method comprises the following steps: when sending the downlink signal, the sending end sends a pilot symbol following one or more OFDM symbols, and the insertion positions of the pilot subcarriers on different pilot symbols in a same sub-frame are different; a receiving end conducts channel estimation after receiving downlink signals, divides the pilot symbols in a same sub-frame into a plurality of groups, for each pilot symbol, the receiving end estimates the channel response of the corresponding sub-carrier on other pilot symbols in the same group according to the channel response on the position of the pilot subcarrier on the pilot symbol, and compares the channel response with the channel response on the position of the pilot subcarrier, calculates the adjustment factors on the position of the corresponding sub-carrier according to the comparison result and the correlativity of the channel time domain, uses the adjustment factors to correct the channel response on the position of the corresponding sub-carrier, and then estimates the channel responses on the positions of all the subcarriers in the sub-frame according to the correction result. The invention further improves performance for estimating channel.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a channel estimation method and system based on an adjustment factor. Background technique [0002] In the current field of communication technology, Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) has attracted much attention. To fully realize the technical advantages of OFDM, it is necessary to first implement related key technologies. Channel estimation technology is one of them. Its algorithm The quality of the performance directly affects the communication quality of the whole system. Channel estimation technology is mainly used in the field of wireless communication to obtain the frequency response of the wireless channel between the transmitting antenna and the receiving antenna. [0003] The design of the channel response estimation module based on reference symbols in the system mainly considers the orthogonal...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04J11/00H04B7/02
Inventor 毕峰苟伟韩小江李峰
Owner ZTE CORP
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