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Quadrature modulation base band signal weighted beam forming method and device

A technology of quadrature modulation and baseband signal, applied in the direction of space transmit diversity, diversity/multi-antenna system, preventing/detecting errors through diversity reception, etc. It can solve the problems such as the principle of QPSK baseband signal weighted beamforming method without data , to achieve the effect of reducing the difficulty and cost of implementation

Inactive Publication Date: 2009-10-21
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, according to the research of the applicant, there is still no information on the specific QPSK baseband signal weighted beamforming method and the principle of the corresponding equipment.

Method used

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  • Quadrature modulation base band signal weighted beam forming method and device
  • Quadrature modulation base band signal weighted beam forming method and device
  • Quadrature modulation base band signal weighted beam forming method and device

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Embodiment 1

[0024] In this embodiment, the basic purpose of suppressing multi-path interference and multi-user access interference is achieved by utilizing the smart antenna with the same carrier, N CDMA users, and directional signaling in N directions. In order to realize the directional transmission of the modulated signals of N users in the required direction, the weighted beamforming of the QPSK baseband signal is used here to realize the directional transmission of the N users in the required direction of the smart antenna.

[0025] In this embodiment, for the directional transmission of the smart antenna, the core circuit principle block diagram of the QPSK baseband signal weighting circuit and the QPSK modulation circuit of an antenna array element is shown in figure 1 .Mainly consist of the following parts: a serial-to-parallel conversion circuit 11, a weighting coefficient generating circuit 12 for determining the beam sending direction, a multiplier M for multiplying the real par...

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Abstract

A quadrature modulation base band signal weighted beam forming method and a device can be used for directive sending of TD-SCDMA standard smart antennae, the method educes mathematical expression formed by a smart antennae beam forming according to array element phase shift feed signal expression of smart antennae, complex expression thereof and quadrature modulation principle, which is realized by weighting quadrature modulation base band signal, and provides a device schematic diagram sent in one direction by single CDMA user of the beam forming method. Directive sending beam forming methodsin N directions by N CDMA users and device schematic diagrams of key components are educed on the above basis. Directive sending of smart antennae is easier to be realized by weighting QPSK base bandsignal than to be realized by intermediate frequency or radio frequency, which increases the equipment reliability and reduces the cost, thereby probabilizing the popularization of smart antennae.

Description

technical field [0001] The present invention relates to a method and equipment for quadrature modulation baseband signal weighted beamforming used for directional transmission of smart antennas, which can be used for directional transmission of TD-SCDMA standard smart antennas, and realize the baseband modulation of CDMA (Code Division Multiple Access) channels using QPSK The signal weighted beam forming also relates to a CDMA smart antenna base station signaling device using the device, belonging to the technical field of mobile communication. Background technique [0002] CDMA base station signaling equipment using smart antennas is a high-tech product in the field of mobile communications. QPSK baseband signal weighted beamforming, this high-tech equipment is used in the smart antenna base station transmitter of CDMA system, which can realize directional transmission and reduce the impact of multi-user interference, and improve the resource utilization of spectrum and tra...

Claims

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Application Information

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IPC IPC(8): H04B7/06H04L1/06
Inventor 李凡贾向东杨景许生傅海阳
Owner NANJING UNIV OF POSTS & TELECOMM
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