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Adaptive modulation method for distributed multi-antenna system

A multi-antenna system, adaptive modulation technology, applied in transmission systems, digital transmission systems, and error prevention/detection through diversity reception, which can solve the problems that AM solutions cannot accurately reflect modulation conditions and system SE is limited.

Inactive Publication Date: 2012-12-19
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

Considering that the existing threshold value is obtained based on approximate BER, so that the corresponding AM scheme cannot accurately reflect the actual modulation situation, resulting in limited system SE

Method used

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  • Adaptive modulation method for distributed multi-antenna system
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  • Adaptive modulation method for distributed multi-antenna system

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Embodiment Construction

[0054] The DAS adaptive modulation method proposed by the present invention has been verified by the Matlab platform, and it can be seen from the simulation results that the method can obtain higher spectral efficiency, thereby providing an effective method for improving the frequency efficiency and performance testing of the system. Provide the technical scheme of concrete implementation below:

[0055] (1) DAS based on antenna selection

[0056] The sending end of the system selects the antenna with the best channel conditions to transmit the signal according to the feedback channel information, that is, selects the RA with the largest output signal-to-noise ratio (SNR) i To transmit the signal to maximize the received signal-to-noise ratio. Sending criteria can be represented by the following model:

[0057] γ=max{γ 1 ,...,γ N} expression 12

[0058] Since the distance between each RA is relatively large, it can be considered that γ 1 ,...,γ N independent of each oth...

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Abstract

The invention relates to an adaptive modulation (AM) method design and performance evaluation for a wireless distributed multi-antenna system (DAS). Under the constraint condition of a target bit error rate (BER), the system frequency spectrum efficiency is maximized to respectively design two AM schemes of a discrete rate and a continuous rate. By aiming at the discrete rate AM, an adaptive switching threshold based on precise BER is provided. Compared with the traditional AM based on an approximate threshold, the AM method disclosed by the invention can obtain high frequency spectrum efficiency. A channel model comprising path loss, shadow fading and Rayleigh fading is designed by considering the practical situation of DAS. On the basis, the computation expression of a continuous rate AM frequency spectrum efficiency, a discrete rate AM frequency spectrum efficiency and the average BER is given so as to provide an effective method for system performance evaluation. An Matlab (matrix laboratory) simulation platform shows that the designed AM method can satisfy the target BER requirement, and the continuous rate AM method is better than a discrete rate AM method. In addition, due to the providing of an improved threshold, the discrete rate AM can be used for realizing the high frequency spectrum efficiency if being compared with the traditional AM method. In addition, the provided frequency spectrum efficiency has good consistency with the average BER calculation and simulation, and the system performance can be effectively evaluated.

Description

technical field [0001] The invention belongs to the field of wireless communication, and relates to the design of an adaptive modulation scheme for wireless communication, and more specifically relates to the design of a continuous rate and discrete rate adaptive modulation method in a distributed MIMO system. Background technique [0002] At present, wireless communication technology has been widely used in all aspects of social life, and the demand for capacity of various wireless communication data services has shown explosive growth, especially the increase in information throughput demand for Internet wireless access and multimedia applications has exceeded For the data rate supported by existing technologies, an important technology to effectively increase the data rate is to install multiple antennas at the system transmitting end and receiving end, that is, Multiple Input and Multiple Output (MIMO, Multiple Input and Multiple Output) technology. Studies have shown th...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L1/06
Inventor 虞湘宾刘晓帅陈小敏殷馨谭文婷刘岩许莙翊
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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