Method and device for estimating carrier to interference plus noise ratio in orthogonal frequency division multiplexing system

A technology of carrier interference and interference noise, which is applied in the field of communication, can solve the problem of large estimation error of carrier interference and noise

Active Publication Date: 2011-04-20
ZTE CORP
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Problems solved by technology

[0015] The technical problem to be solved by the present invention is to provide a method and device for improving the accuracy of carrier-to-interference-

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  • Method and device for estimating carrier to interference plus noise ratio in orthogonal frequency division multiplexing system
  • Method and device for estimating carrier to interference plus noise ratio in orthogonal frequency division multiplexing system
  • Method and device for estimating carrier to interference plus noise ratio in orthogonal frequency division multiplexing system

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Embodiment Construction

[0060] In order to solve the problem of large estimation error of the carrier-to-interference-to-noise ratio in the prior art, the present invention provides a method and device for estimating the carrier-to-interference-to-noise ratio in an OFDM system. The following describes the present invention in conjunction with the drawings and embodiments For further details. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0061] Embodiment 1 of the present invention relates to a method for estimating carrier-to-interference-noise ratio in an OFDM system. In this embodiment, figure 1 The LTE downlink subframe structure shown is taken as an example for illustration. The basic transmission unit of LTE is 1 subframe with a time interval of 1 millisecond; figure 1 Among them, D represents the data subcarrier, and P i，j (i=1, 2, 3, 4, j=1, 2, . . . , K, K being the number of pilot s...

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Abstract

The invention discloses a method for estimating the carrier to interference plus noise ratio in an orthogonal frequency division multiplexing system, which comprises the following steps of: 101, grouping by taking three adjacent pilot subcarriers in each pilot symbol in a subframe as a group to obtain a second-order differential value of a channel response estimated value of each group of plot subcarriers of each pilot symbol; 102, obtaining an interference noise item on the same group of pilot subcarriers in the subframe according to the second-order differential value; 103, obtaining average interference noise power of pilot symbols in the subframe according to the interference noise item on the same group of pilot subcarriers in the subframe; 104, obtaining the total average power of pilot symbols in the subframe; and 105, obtaining the carrier to interference plus noise ratio according to the average interference noise power and the total average power. The invention also discloses a device for estimating the carrier to interference plus noise ratio in an orthogonal frequency division multiplexing system. Through the method or the device, more accurate carrier to interference plus noise ratio can be obtained, and the system performance is further improved.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method and device for estimating carrier-to-interference-noise ratio in an orthogonal frequency division multiplexing system. Background technique [0002] In recent years, OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) technology, as a multi-carrier transmission technology, has attracted widespread attention. The OFDM technology converts the input serial data into parallel transmission data, and modulates the parallel data onto multiple sub-carriers, that is, sub-channels with orthogonality, and then transmits the modulated data. [0003] OFDM technology has been successfully applied to Asymmetric Digital Subscriber Line (ASDL, Asymmetric Digital Subscriber Line), Digital Audio Broadcasting (DAB, Digital Audio Broadcasting), HDTV (HDTV, High-definition Television), Wireless Local Area Network (WLAN, WirelessLocal Area Netwo...

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Application Information

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IPC IPC(8): H04B17/00H04L27/26
CPCH04J11/0023H04L27/2647H04L25/0228
Inventor 余秋星陈琼韩亚洁刘巧艳
Owner ZTE CORP
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