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Incomplete CSI (Channel State Information)-based distributed antenna system adaptive modulation method

A distributed antenna and adaptive modulation technology, applied in diversity/multi-antenna systems, baseband system components, multi-carrier systems, etc., can solve the problem of failing to provide performance evaluation methods, optimizing resource allocation, and not adopting AM solutions, etc. question

Inactive Publication Date: 2015-06-10
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

However, none of the above studies adopted the AM scheme to optimize resource allocation, nor did they give corresponding performance evaluation methods.

Method used

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  • Incomplete CSI (Channel State Information)-based distributed antenna system adaptive modulation method
  • Incomplete CSI (Channel State Information)-based distributed antenna system adaptive modulation method
  • Incomplete CSI (Channel State Information)-based distributed antenna system adaptive modulation method

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Embodiment Construction

[0045] The present invention will be further described below in conjunction with the accompanying drawings.

[0046] 1) Establish a distributed antenna system model and a channel model based on incomplete CSI:

[0047] attached figure 1 is the physical model of the distributed antenna system, the cell unit is modeled as a circular area with a radius of R, assuming that the cell has N t Root remote antenna (RA), each remote antenna is scattered in different locations of the cell, denoted as RA i (i=1,2,....,N t ), connected to a central processing unit (MPU) via optical fiber or coaxial cable. Mobile Terminals (MT) equipped with N r root receiving antenna, assuming the i-th remote antenna RA i is selected to transmit signals, then the received signal of the mobile terminal can be expressed as

[0048] y i = P t h i x + ...

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Abstract

The invention discloses an incomplete CSI (Channel State Information)-based distributed antenna system adaptive modulation method. A distributed antenna system model is constructed by using multiple remote transmitting antennas, a Rayleigh fading channel model is constructed, channel estimation is performed on small-size fading of the Rayleigh fading channel model to obtain an estimated signal-noise ratio between the remote antennas and an MT (Mobile Terminal); by using an antenna selection technology, the remote transmitting antenna with the maximum estimated signal-noise ratio is selected to perform signal transmission; an adaptive modulation method and adaptive switching threshold setting are designed according to maximum average spectral efficiency; adaptive modulation switching threshold is calculated by using a BER (Bit Error Rate) formula of a precise M-QAM (Mulriple Quadrature Amplitude Modulation) modulation mode under an additive white Gaussian noise channel; average effective transmission efficiency SE and average bit error rate BER are calculated by using an integral transformation formula and a numerical analysis method. The adaptive modulation method and the adaptive switching threshold guarantee that the SE of the system is improved by meeting the requirement of a target BER.

Description

technical field [0001] The invention relates to an adaptive modulation method of a distributed antenna system based on incomplete CSI, and belongs to the technical field of adaptive modulation of mobile communication. Background technique [0002] With the rapid rise of mobile networks, mobile communication technology has been widely used in all aspects of social life, and the demand for capacity of various wireless communication services has shown explosive growth, which has exceeded the data rate supported by existing technologies. An important technology to effectively increase the data rate is to place multiple antennas at the sending end and receiving end of the system, that is, multiple-input multiple-output technology. Research shows that multiple-input multiple-output (MIMO) technology can make full use of space resources, effectively resist the influence of wireless channel fading without increasing the system bandwidth and the total antenna transmission power, and ...

Claims

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Application Information

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IPC IPC(8): H04L27/36H04L25/02H04B7/06
Inventor 吴彬彬虞湘宾王莹
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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