Transmitting channel correcting method in multiple input multiple output system

Abstract

This invention discloses a correction method for emission channels in a MIMO system including: a, carrying out baseband modulation to pilot signals and service signals to get baseband modulation signals to be converted to RF signals by the emission channels to be sent to the antenna interface, b, getting the pilot signals of the emission channels from the signals at the antenna interface to get the correction coefficient of the emission channels, c, utilizing the correction coefficients to correct the channels, which takes the pilot signals as the emission correction signals and the pilot signals are inserted for the channel estimation so it will not influence the network.

Description

technical field [0001] The invention relates to the key technology of multiple-input multiple-output (MIMO), in particular to a transmission channel correction method in the MIMO system. Background technique [0002] Wireless communication systems can receive and transmit signals using MIMO technology. The MIMO technology comprehensively utilizes the information of the wireless channel, and can improve the performance of the wireless communication system in terms of coverage, spectrum utilization and channel capacity. MIMO technology can be used in both base stations (BS) and subscriber stations (SS). For an Orthogonal Frequency Division Multiplexing (OFDM) system or an Orthogonal Frequency Division Multiple Access (OFDMA) system, if MIMO technology is used, system performance can be greatly improved. [0003] At the transmitting end in an actual MIMO system, the amplitude, phase and time delay of each transmitting channel from the baseband to the antenna port are inconsis...

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Problems solved by technology

[0007] As mentioned above, the transmission correction signal required in the transmission channel calibration process of the prior art MIMO system is time-division injected into the transmission channel, and the method of time-division injecting the transmission correction signal has the following problems: the system needs to provide free time for injecting the transmission correction signal Therefore, it is limited by the application of the transmission channel correction method; since the transmission correction signal and the service signal are time-division multiplexed, and the transmission correction signal may also need to share bandwidth with other control information, therefore, it is necessary to design complex correction timing and Correction algorithm; after the transmission correction signal that is not a business signal is sent to the antenna port through the coupler, the antenna sends the transmission correction signal to the wireless space, which increases unnecessary interference in the communication network

[0008] In summary, since the method of time-division injection of transmission correction signals causes a series of negative effects, the method of using time-division injection of transmission correction signals for MIMO system transmission channel correction is limited by application and requires the design of complex correction algorithms. And add unnecessary interference to the communication network

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