New MIMO-OFDM system packet self-adaptive modulation method

A MIMO-OFDM, adaptive modulation technology, applied in the field of adaptive modulation technology selection, can solve unseen specific problems

Inactive Publication Date: 2018-11-16
WUHAN UNIV OF TECH
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Problems solved by technology

Although in the 4G system and in the research and development of 5G technology, the system can also choose different modulation methods such as 16QAM, 64QAM, and 256QAM, but there is no specific codeword structure based on space-frequency coding for each user. Group scheduling, and further according to the channel quality of different subcarrier groups of different transmitting antenna groups, a public report on the realization of adaptive modulation of space-frequency coded MIMO-OFDM systems

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  • New MIMO-OFDM system packet self-adaptive modulation method
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  • New MIMO-OFDM system packet self-adaptive modulation method

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Embodiment Construction

[0024] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments of the present invention.

[0025] The invention discloses a method based on space-frequency coding when OFDM subcarriers are grouped and used in a space-diversity multiple-input multiple-output (MIMO)-orthogonal frequency-division multiplexing (OFDM) system using space-frequency block coding (STBC). The antennas are grouped according to the codeword structure and channel quality estimation, and then the appropriate modulation technology is selected for different subcarrier groups of different antenna groups, so as to achieve the maximum possible improvement of the system spectrum under the premise of ensuring the bit error rate required by the receiving end. efficiency. In a MIMO-OFDM wireless communication system, the channel quality from different antennas to a receiver may not only vary greatly, but may also change over tim...

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Abstract

The invention provides a new MIMO-OFDM system packet self-adaptive modulation method. The method is characterized by comprising the following steps: for a MIMO-OFDM system adopting the spatial frequency packet coding, performing packet usage on the antenna by considering a codon structure of the spatial frequency coding and a channel quality to a receiver from each antenna in a unified way, independently adopting appropriate different linear digital modulation technologies for different antenna groups according to the channel quality, thereby enabling the receiver to perform correct spatial frequency decoding for each packet and to realize the independent digital demodulation. Through the technical scheme provided by the invention, the system can simply realize the self-adaptive modulationand demodulation by using the codon structure, and higher spectrum efficiency can be provided as far as possible when the required bit error rate is satisfied. The method provided by the invention ismainly used for a mobile communication system and a downlink communication link of other wireless communication network, namely, the communication link from a base station to a user, but not excludethe application in an uplink.

Description

technical field [0001] The invention belongs to the field of information technology, in particular, in a MIMO-OFDM wireless communication system, when the transmitting end of the system adopts the diversity transmission technology based on space-frequency block coding, the system performs adaptive modulation technology selection according to the channel transmission quality. Background technique [0002] In modern broadband wireless communication, MIMO-OFDM transmission has become a key technology in 4G, 5G and even future wireless communication systems in order to improve system capacity and improve the system's ability to resist channel fading and resist mutual interference between multiple access communications. In the MIMO-OFDM system, the space-frequency block coding-based space diversity transmission mode is one of the main transmission modes adopted by the base station in the downlink transmission. In order to make the system obtain the maximum communication capacity ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L27/00H04B7/0413
CPCH04B7/0413H04L27/0008H04L27/2627
Inventor 李平安李淼王克浩田晶晶张海洁
Owner WUHAN UNIV OF TECH
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