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Channel calibration method and device

A calibration method and channel technology, applied in the field of communication, can solve problems such as TDD-BF performance deterioration, and achieve the effect of increasing interference suppression

Inactive Publication Date: 2010-06-09
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention is proposed in view of the problem that the asymmetry or non-reciprocity of TDD-BF uplink and downlink channels in the related art leads to the deterioration of TDD-BF performance. Therefore, the main purpose of the present invention is to provide a channel calibration method and device, to address at least one of the above

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  • Channel calibration method and device

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Embodiment 1

[0053] In this embodiment, the radio frequency system in the base station adjusts the subcarrier amplitude / power and phase of each beamforming signal channel in the baseband, transmits the real part and imaginary part signals of the amplitude and phase calibration data, and adjusts the frequency of each antenna according to the OFDM bandwidth or the number of subcarriers to transmit data for calibration, and the calibration compensation value of each OFDM subcarrier is multiplied by the beamforming data on the subcarrier. The beamforming channel calibration data and the OFDM subcarrier unique correspondence are agreed upon, and the calibration data is transmitted through scheduling signaling.

[0054] The radio frequency system notifies the time slot of the scheduled frame required for baseband scheduling, generates calibration data and transmits it to the baseband, and performs calibration according to the time + minute + second + relative frame number + several downlink symbo...

Embodiment 2

[0071] interference suppression method

[0072] In this embodiment, the interference cancellation (Interference cancellation, IC) algorithm uses subcarrier frequency division multiple access, BF space multiple access, and frame time division multiple access technologies to enhance the signal interference and noise ratio (Signal interference and noise ratio, SINR) and Anti-interference ability. When multi-sector co-frequency interference occurs adjacent to the cell, the orthogonality of data subcarriers and spatial multiple access is not good, and the baseband uplink will use the IC algorithm to eliminate the co-frequency interference of the cell. When the co-channel interference intensity of the uplink user exceeds the threshold, the downlink frame of the user is scheduled to other subcarriers through the baseband, and the possibility of co-channel interference in the next frame adjacent to the cell is greatly reduced due to the adjustment of the subcarrier.

[0073] In TDD-B...

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Abstract

The invention discloses channel calibration method and device, wherein the method comprises the following steps of: dispatching the time slot of a preset frame; estimating an upper radio frequency channel and a lower radio frequency channel of equipment in the time slot, obtaining the gain and signal delay parameters of a sending part and a receiving part of the upper radio frequency channel and the lower radio frequency channel of the equipment, and computing the calibration compensation data of the equipment; and calibrating by applying the calibration compensation data in a weight value mode. The invention solves the problem of TDD-BF performance deterioration caused by the asymmetry or nonreciprocity of an upstream channel and a downstream channel of a TDD-BF, improves the calibration reliability and ensures the high-quality data transmission of beam shaping.

Description

technical field [0001] The present invention relates to the communication field, in particular to a channel calibration method and device. Background technique [0002] In recent years, the multi-antenna technology has developed rapidly, and has been widely applied in the fourth generation mobile communication (4th Generation mobile system, 4G for short) and the long term evolution (Long Term Evolution, LTE for short) systems. In 4G, Time Division Duplex Beam Forming (TDD-BF for short), also known as iterative antenna or smart antenna technology (Adaptive Antenna System, AAS for short), can significantly improve the coverage and It enhances the quality of communication signals, and saves a considerable number of base stations to reduce operating costs. Therefore, it is regarded as one of the most important communication technologies in 4G. [0003] However, there are still many problems that plague the development of time-division beamforming technology. For example, the as...

Claims

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Application Information

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IPC IPC(8): H04B7/26H04B17/00H04B17/11H04B17/21H04B17/309
Inventor 尹武王永贵
Owner ZTE CORP
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