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Method and device of measuring carrier interference noise ratio

A technology of carrier interference and interference noise, applied in the direction of multi-frequency code system, etc., can solve the problem of inaccurate measurement of carrier-to-interference-noise ratio, and achieve the effects of overcoming inaccurate measurement, improving flexibility, and improving adaptability

Inactive Publication Date: 2008-03-12
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0044] The present invention provides a method for measuring carrier-to-interference-to-noise ratio, which is used to solve the problem of inaccurate measurement of carrier-to-interference-to-noise ratio in the prior art when a mobile terminal experiences a time-varying channel

Method used

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  • Method and device of measuring carrier interference noise ratio
  • Method and device of measuring carrier interference noise ratio
  • Method and device of measuring carrier interference noise ratio

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Embodiment 1

[0099] This embodiment describes the specific process of measuring the carrier-to-interference-noise ratio of the sub-carrier by using the estimated value of the channel response in the frequency domain on the pilot sub-carrier in the 802.16e uplink PUSC mode.

[0100] This embodiment follows the examples cited in the prior art. The prior art has proved that when the modulation mode of the pilot subcarrier carrying data is BPSK, the pilot subcarrier P i，j，k (i=1 or 3, 1≤j ≤2, 1≤k≤K) carrier-to-interference-noise ratio and its frequency-domain channel estimation value (i=1 or 3, 1≤j≤2, 1≤k≤K) have the same carrier-to-interference-to-noise ratio, therefore, the carrier-to-interference-to-noise ratio of the pilot subcarriers can be measured by frequency domain channel estimation.

[0101] Referring to FIG. 2 , it is a schematic flow chart of measuring the carrier-to-interference-noise ratio by using the frequency-domain response signal estimation value of the pilot subcarrier in...

Embodiment 2

[0170] This embodiment describes the specific process of measuring the carrier-to-interference-noise ratio of the sub-carrier by using the estimated value of the channel response in the frequency domain on the pilot sub-carrier in the 802.16e uplink PUSC mode. The process is similar to the first embodiment, except that the implementation Example 1 is to measure the carrier-to-interference-noise ratio through the carrier-to-interference noise power of two OFDM symbols. In this embodiment, the carrier-to-interference-noise ratio is measured through the carrier-to-interference noise power of one OFDM symbol.

[0171] Referring to Fig. 3, for the present invention utilizes the frequency domain channel response estimated value of pilot subcarrier to measure the flow diagram of carrier-to-interference-noise ratio under 802.16e system uplink PUSC mode, its specific steps include:

[0172] S201. Select K time-frequency units in the time-frequency region allocated to the user, and selec...

Embodiment 3

[0252] This embodiment describes the specific process of measuring the carrier-to-interference-noise ratio of the sub-carrier by using the estimated value of the channel response in the frequency domain on the data sub-carrier in the 802.16e uplink PUSC mode.

[0253] Figure 1, R i，j Represents a data subcarrier, i is the number of an OFDM symbol in a time-frequency unit, and j is the number of a data subcarrier in the same OFDM symbol in a time-frequency unit. Suppose an uplink data resource block contains K time-frequency units, R i，j，k Represents the j th data subcarrier of the i th OFDM symbol in the k th time-frequency unit. This embodiment utilizes the data subcarrier R i，j，k (i=1, 3; 1≤j≤2, 1≤k≤K) Carrier interference noise measurement, the specific steps include:

[0254] S301. Select K time-frequency units in the time-frequency region allocated to the user, and select the data subcarrier R in the first and third OFDM symbols in each time-frequency unit i，j，k (i=1,...

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Abstract

The present invention discloses a method for measuring a carrier interference noise ratio. The method comprises that a plurality of sub-carriers are respectively selected from the frequency spot on the two symbols in one or a plurality of time frequency units, and the number of the sub-carriers selected from each time frequency unit is the same; one or two symbols is (are) respectively selected from the two symbols of the time frequency unit, the interference noise power of the frequency domain channel response estimated value of the sub-carrier on the symbols selected is accounted, and the interference noise power of the sum of the frequency domain channel response estimated value of the sub-carriers on the symbol; according to the characteristic that the frequency domain channel response of the sub-carrier on the symbol in the time frequency unit keeps invariable on the frequency domain, the power error caused by the frequency domain channel response changing along time in the former interference noise power is eliminated; according to the interference noise power of the sub-carrier frequency domain channel response estimated value after being eliminated, the carrier interference noise ratio is calculated. The present invention can accurately measure the carrier interference noise ratio when the terminal experiences a time-varying channel or a time-invariant channel.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a method and device for measuring the carrier-to-interference-noise ratio in a communication system. Background technique [0002] In recent years, a multi-carrier transmission technology represented by Orthogonal Frequency Division Multiplexing (OFDM) has attracted widespread attention. Multi-carrier transmission decomposes a data stream into several independent sub-streams, each with a much lower bit rate. Using the low-rate symbols formed at such a low bit rate to modulate the corresponding sub-carriers constitutes a transmission system in which multiple low-rate symbols are sent in parallel. [0003] After years of development, OFDM technology has been successfully applied to asymmetric digital subscriber line (Asymmetric Digital Subscriber Line, ADSL), wireless local loop (Wireless Local Loop, WLL), digital audio broadcasting (Digital Audio Broadcasting, DAB), high-def...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 钱云襄
Owner HUAWEI TECH CO LTD
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