Multi-aerial system transmitting mode and modulation mode selection method of non-ideal communication channel

A technology of multi-antenna system and modulation mode, applied in diversity/multi-antenna system, space transmit diversity, prevention/detection of errors through diversity reception, etc., can solve problems such as inapplicability and receiver's inability to obtain ideal channel information, etc., to achieve Effect of Improving Spectrum Efficiency

CN101247158AInactive Publication Date: 2008-08-20SHANGHAI JIAO TONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2008-08-20
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention provides a multiple-aerial system transmitting system and a modulation mode selecting method of the non-ideal communication channel. In the Rayleigh channel mode the receiver is provided with ideal communication channel information and adopts the maximum likelihood detector for respectively simulating in different modulation modes to obtain the system error code ratio curve. According to the request of the system error code ratio, the ideal signal-to-noise ratio threshold of the complexing system and the diversity system satisfying the request of the error code ratio is obtained. Afterwards in the actual communication system, the non-ideal signal-to-noise threshold is obtained with the mean square error between the signal-to-noise ratio threshold and the non-ideal communication channel information, and the non-ideal signal-to-noise ratio is compared with the signal-to-noise of current system. Then a transmitting mode and modulating mode which satisfy the request of the error code ratio and have maximum frequency spectrum efficiency are selected for feedbacking to the transmitting side. The transmitter adjusts the current transmitting mode and modulating mode according to the feedback information. The invention can correctly select the transmitting mode and modulating mode according to the system environment and the mean square error of the non-ideal communication channel information and evidently increase the frequency spectrum efficiency of the system.
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Description

technical field

[0001] The invention relates to a method for selecting a transmission mode and a modulation mode of a non-ideal channel multi-antenna system, in particular to a method for adjusting the transmission mode and modulation mode adopted by the current multi-antenna system by applying the mean square error of channel estimation. The invention belongs to the technical field of multi-antenna adaptive transmission in a wireless communication system. Background technique

[0002] Research in recent years has shown that a multiple-input multiple-output (MIMO) system composed of multiple antennas in the transmitter and receiver can significantly improve system capacity, quality and reliability. MIMO systems have significant advantages over single-in, single-out (SISO) systems. Therefore, MIMO technology has become the key technology of the next generation communication system, which has aroused people's extensive research interest. With the development of wireless comm...

Examples

Embodiment Construction

[0019] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0020] Consider a multi-antenna system with 2 transmit antennas and 2 receive antennas. The modulated transmission symbols of the multiplexing system undergo serial-to-parallel conversion and are transmitted through two antennas respectively. The modulated symbols of the diversity system are space-time coded first, and then transmitted through the corresponding antenna. Assume that the channel model of the system is a Rayleigh channel model. The specific implementation steps are as follows:

[0021] 1. In the multiplexing system, assuming that the receiver has ideal channel information, the maximum likelihood detector is used, and the modulation method is binary phase shift keying (BPSK) and quaternary phase shift keying (QPSK), the simulation results are The bit error rate curve of the multiplexing system.

[0022] 2. In ...