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Narrow-band interference detecting method and device in MIMO-OFDM (Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing) system

A MIMO-OFDM, narrowband interference technology, applied in the field of mobile broadband wireless access, can solve problems such as inability to accurately detect narrowband interference power, and achieve the effect of remarkable effect, simple calculation, and improved performance

Inactive Publication Date: 2012-04-04
ZTE CORP
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Problems solved by technology

[0010] The present invention provides a narrowband interference detection method and device in a MIMO-OFDM system, which is used to solve the problem in the prior art that the narrowband interference power cannot be accurately detected when the narrowband interference is weak

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  • Narrow-band interference detecting method and device in MIMO-OFDM (Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing) system
  • Narrow-band interference detecting method and device in MIMO-OFDM (Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing) system
  • Narrow-band interference detecting method and device in MIMO-OFDM (Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing) system

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Embodiment Construction

[0051]Aiming at the defects of the traditional narrowband interference detection method, the present invention proposes a more accurate narrowband interference detection method for MIMO-OFDM system, which is combined with the MAP algorithm at the receiving end of the MIMO system, even when the narrowband interference is weak, The location and power of narrowband interference can be accurately detected. The performance of the MIMO-OFDM system can be greatly improved by performing adaptive narrowband interference suppression through this method.

[0052] see figure 2 , the figure is the coding structure diagram of the MIMO-OFDM system, in the figure, the received signal y k It can be expressed as

[0053] the y k = h k x k +NI k

[0054] where x k Indicates the kth transmitted signal, h k is the channel response in the frequency domain, N k represents additive white noise, I k is the interference, and k is the subcarrier sequence number. Combine noise and interferin...

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Abstract

The invention discloses a narrow-band interference detecting method and device in an MIMO-OFDM (Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing) system. The method comprises the follow steps of: a pilot-frequency sub-carrier group composed of two pilot frequencies is selected in each time-frequency unit, and the two pilot frequencies in the pilot-frequency sub-carrier group are on different frequency positions of different OFDM signs; and the channel response values of two sub-carriers in the pilot-frequency sub-carrier group minus the signal power sum of the pilot-frequency sub-carrier group obtain the interference noise power value of the pilot-frequency sub-carrier group, so that the interference noise power value of each sub-carrier of the time-frequency unit is determined. The device comprises a pilot-frequency sub-carrier group selecting module and an interference noise power value determining module. The method and the device can accurately estimate the narrow-band interference information and can accurately detect the narrow-band interference position and power even if the narrow-band interference is weaker.

Description

technical field [0001] The present invention relates to the field of mobile broadband wireless access, in particular to narrowband interference detection in a Multiple Input Multiple Output (MIMO) mode in an Orthogonal Frequency Division Multiplexing (OFDM) system Methods and devices. Background technique [0002] The new generation of wireless communication systems requires higher transmission rates, and OFDM technology emerges as the times require. It divides serial data into N different parallel data streams, and transmits them in parallel on N carriers without mutual interference, which greatly improves the transmission rate of the system, and the data stream of each sub-carrier has a lower bit rate , improving the reliability of transmission. [0003] OFDM uses coded and modulated data as frequency domain information, transforms it into the time domain through Inverse Fourier Transform (Inverse Discrete Fourier Transform, IDFT), and transmits it on the channel. , DFT...

Claims

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Application Information

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IPC IPC(8): H04L25/02H04L27/26H04L1/06
CPCH04J11/0066H04L27/2691H04L5/0048H04L5/0023
Inventor 周旭武韩英杰
Owner ZTE CORP
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