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Method and device for frequency domain balancing detection

A technology of frequency domain equalization and detection methods, applied in the field of communication, can solve the problems of decreased calculation accuracy, deterioration of detection performance, and degradation of detection performance, and achieve the effect of ensuring detection performance

Active Publication Date: 2013-10-30
DATANG MOBILE COMM EQUIP CO LTD
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Problems solved by technology

[0018] (4) Received signal model under the condition of inter-cell interference in the uplink of LTE system
[0028] In the prior art, only the MRC detection method or the IRC detection method can be fixedly selected for detection. Through the analysis of the received signal expression, it can be known that when the interference plays a dominant role in the received signal, the MRC detection method only regards the above interference as noise It will inevitably lead to a sharp deterioration of the detection performance; when the interference does not play a dominant role in the received signal, the IRC detection method will lead to a decrease in calculation accuracy due to the introduction of channel estimation errors, and will lead to a decrease in detection performance

Method used

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  • Method and device for frequency domain balancing detection

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Embodiment 1

[0044] The downlink of the LTE system adopts OFDMA (Orthogonal Frequency Division Multiple Access, Orthogonal Frequency Division Multiple Access), and the uplink adopts SC-FDMA technology. Each user in the cell is orthogonal to each other and there is no interference. The same frequency band is used between cells, and the interference between cells becomes the main interference. In many practical scenarios, LTE uplink is an interference-limited system, and narrow-band interference may exist in some PRB bandwidths; in interference-limited systems (there are relatively large Strong inter-user interference or co-channel interference caused by frequency reuse), when the interference plays a dominant role in the received signal, the MRC detection method treats the above interference as noise, and the performance of the IRC detection method is better than that of the MRC detection method at this time; When the interference does not play a dominant role in the received signal, the IRC...

Embodiment 2

[0080] Based on the same inventive concept as the above method, an embodiment of the present invention also provides a frequency domain equalization detection device, such as Figure 4 As shown, the equipment includes:

[0081] Calculation module 11, for calculating the noise interference covariance matrix Re_pilot of the pilot subcarrier;

[0082] The determining module 12 is configured to use the noise-interference covariance matrix Re_pilot of the pilot subcarriers to determine the frequency-domain equalization detection using the interference suppression combined IRC detection method or the maximum ratio combined MRC detection method.

[0083] In the embodiment of the present invention, the calculation module 11 is specifically used to obtain the estimated channel response value H_pilot by performing channel estimation of the pilot subcarrier, and calculate the noise interference of the pilot subcarrier by using the estimated channel response value H_pilot Covariance matr...

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Abstract

The invention discloses a method and device for frequency domain balancing detection. The method comprises the steps that a noise interference covariance matrix Re-pilot of a pilot frequency sub-carrier and a noise interference covariance matrix Re-Data of a data sub-carrier are calculated; whether an interference rejection combining IRC detecting method or a maximal ratio combining MRC detecting method is adopted for conducting frequency domain balancing detection is determined through the noise interference covariance matrix Re-pilot of the pilot frequency sub-carrier or the noise interference covariance matrix Re-Data of the data sub-carrier. According to the method and device for frequency domain balancing detection, the MRC detecting method or the IRC detecting method is selected in a self-adapting mode to conduct frequency domain balancing detection so that when interference plays a leading role in signal receiving, the interference and the noise can be distinguished and the detection performance can be fully guaranteed; when the interference does not play the leading role in signal receiving, calculating accuracy decline caused by introduction of a channel evaluation error can be avoided and the detecting performance can be completely guaranteed.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a method and equipment for frequency domain equalization detection. Background technique [0002] (1) A time-frequency domain structure of an uplink data signal and a pilot signal of an LTE (Long Term Evolution, long-term evolution) system. [0003] The time-frequency domain structure of PUSCH (Physical Uplink Shared Channel, Physical Uplink Shared Channel) in subframe n is: one subframe (1ms) is occupied in the time domain, and N PRBs (Physical Resource Block, physical resource block) are occupied in the frequency domain , each PRB occupies 12 SCs (Subcarriers) in the frequency domain. Each subframe contains two columns of PUSCH pilots. Under the conventional CP (Cyclic Prefix, cyclic prefix), the PUSCH pilot signal is located in the fourth column SC-FDMA (Single Carrier-Frequency Division Multiple Access, single carrier frequency division multiple access ) symb...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L25/02
Inventor 任斌李琼戴晓明
Owner DATANG MOBILE COMM EQUIP CO LTD
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