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Self-adaptive open-loop CSD (cyclic delay diversity) method used for wireless communication system

An adaptive, transmitting antenna technology, applied in radio transmission systems, diversity/multi-antenna systems, transmission systems, etc., can solve problems such as reducing system performance, and achieve the effect of improving system performance and significant gain

Inactive Publication Date: 2015-02-18
ZTE WAVETONE SCI & TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In systems with IEEE 802.11 series standards, CSD operations are generally used for system compatibility. However, when there is correlation between the channels between the AP and the mobile terminal, doing CSD sometimes degrades the system performance, so in Different CSD application strategies are selected between different frames, which has the potential to improve system performance

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  • Self-adaptive open-loop CSD (cyclic delay diversity) method used for wireless communication system
  • Self-adaptive open-loop CSD (cyclic delay diversity) method used for wireless communication system
  • Self-adaptive open-loop CSD (cyclic delay diversity) method used for wireless communication system

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Embodiment Construction

[0026] Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention Modifications in equivalent forms all fall within the scope defined by the appended claims of this application.

[0027] The following is a simulation test of the implementation of the scheme based on the IEEE 802.11ac protocol framework in the millimeter wave wireless LAN communication scenario. The B model in the 802.11ac channel model is selected for the implementation of this plan, and the antenna configuration is 4 transmitting antennas and 1 receiving antenna.

[0028] In a real environment, the channel state is always changing, but these changes finally obey a certain statist...

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Abstract

The invention discloses a self-adaptive open-loop CSD (cyclic delay diversity) method used for a wireless communication system. The self-adaptive open-loop CSD method includes performing channel estimation through a training sequence; calculating relevance of channels among different emitting antennas; applying a certain rule to judge whether CSD operation is performed or not; performing feedback and control of self-adaptive CSD operation on each frame through two reserved or newly-increased bits of a signaling field. According to the self-adaptive open-loop CSD method, each frame is estimated, and self-adaptive CSD operation is performed according to channel change conditions, so that system performance is improved; especially under the circumstance of low signal-to-noise ratio, gain brought by self-adaptive CSD is more obvious.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, in particular to an adaptive open-loop cyclic shift diversity method for a wireless communication system. Background technique [0002] Diversity is an important technology to resist fading and improve link reliability in wireless communication systems. The basic principle of diversity is to receive multiple copies of the same information through multiple channels (time, frequency, phase, space or code) with different transmission characteristics, and the receiver can recover the transmitted signal more correctly by using these multiple copies that have experienced different fading . From the perspective of the transceiver, diversity can be divided into transmit diversity and receive diversity. From the perspective of channel resources, it can be divided into space diversity, time diversity and frequency diversity. [0003] Cyclic Delay Diversity (CSD) is to transmit copies of t...

Claims

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Application Information

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IPC IPC(8): H04B7/06
CPCH04B7/0626H04B7/0632
Inventor 何世文余光识马士民王海明杨绿溪张军洪伟江华
Owner ZTE WAVETONE SCI & TECH
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