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Method for computing carrier jamming noise ratio under OFDM

A technology of orthogonal frequency division and carrier interference, applied in the field of communication, can solve the problems of inability to resist frequency selective fading and channel time variation

Inactive Publication Date: 2008-07-23
ZTE CORP
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  • Summary
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  • Application Information

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Problems solved by technology

[0020] The present invention provides a method for calculating carrier-to-interference-noise ratio under orthogonal frequency division multiplexing, which is used to solve the problem that the calculation of carrier-to-interference-noise ratio in the prior art cannot resist frequency selective fading and channel time variation

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  • Method for computing carrier jamming noise ratio under OFDM
  • Method for computing carrier jamming noise ratio under OFDM
  • Method for computing carrier jamming noise ratio under OFDM

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Embodiment Construction

[0047] The method described in the embodiment of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0048] First, the method described in the first embodiment of the present invention will be described in detail.

[0049] As shown in FIG. 1 , FIG. 1 is a schematic structural diagram of a time-frequency unit in an 802.16e uplink PUSC mode. A tile is a time-frequency unit, and a tile contains 12 subcarriers, including 4 pilot subcarriers and 8 data subcarriers. Wherein the first OFDM symbol and the third contain pilot subcarriers, and all subcarriers in the second OFDM symbol are data subcarriers. Wherein, P represents a pilot subcarrier, and D represents a data subcarrier. As can be seen from Figure 1, P 1 and P 2 is the pilot subcarrier in the first OFDM symbol, P 3 and P 4 is the pilot subcarrier in the third OFDM symbol, and the remaining subcarriers are data (D 1 ~D 8 ).

[0050] As shown in Fig. 2, Fig. 2 is un...

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Abstract

The invention discloses a method for measuring carrier interference noise ratio under orthogonal frequency division multiplexing, which comprises getting a plurality of pilot subcarrier groups through choosing composition modes of pilot subcarrier groups in a plurality of time-frequency unit, calculating channel response value of pilot subcarrier of the pilot subcarrier groups to each pilot subcarrier group, calculating signal efficiency which is corresponded with the channel response value of the pilot subcarrier groups and disturbance and noise efficiency according to the channel response value according to the pilot subcarrier, calculating to get carrier interference noise ratio according to the sum of signal efficiencies of a plurality of pilot subcarriers and the sum of the disturbance and noise efficiency of the pilot subcarrier groups. The invention overcomes the shortcomings that in the prior art, the calculation of carrier interference noise ratio which is caused by frequency which is selective fading and channel time-varying is accurate through processing pilot frequency signals which are received on the adjacent pilot subcarriers.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method for calculating carrier-to-interference-noise ratio under orthogonal frequency division multiplexing. Background technique [0002] In recent years, OFDM (Orthogonal Frequency Division Multiplexing) technology has been used for high-speed data transmission through wired / wireless channels. 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] This OFDM technology is widely applied to digital transmission technologies, such as digital / audio broadcasting, digital TV, wireless local area network (WLAN), wireless asynchronous transfer mode (WATM), broadband wireless access (BWA) and so on. [0004] For a system based on OFDM technology, a very important reference index in AMC (adaptive codin...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04J11/00
Inventor 张磊李玉洁刘巧艳赵路
Owner ZTE CORP
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