Three-dimensional beamforming space division multiple access adaptive transmission method
A technology of adaptive transmission and space division multiple access, applied in transmission system, radio transmission system, advanced technology, etc., can solve the problems of channel information uplink capacity burden, channel estimation error, unrealistic, etc.
Active Publication Date: 2017-05-03
SOUTHEAST UNIV
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Problems solved by technology
Due to the inevitable feedback delay in the transmission of feedback information, and the channel estimation may have errors, it is often unrealistic to assume that the ideal channel information is known at the sending end, especially when the number of users and the number of transmitting antennas are large and the channel When the state changes rapidly
In addition, for FDD systems, the feedback of channel information causes a great burden on the uplink capacity, and this problem becomes more serious in broadband (such as OFDM) systems and systems with high mobility
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[0054] Below embodiment is made further description The specific implementation mode of the present invention is as follows:
[0055] 1) If it is a TDD system, skip to step 2); if it is an FDD system, skip to step 4).
[0056] 2) The base station uses the result of uplink channel estimation and channel reciprocity to obtain the downlink channel matrix H of user i i , using the formulas [3] and [4] to calculate the vertical transmission correlation matrix R of user i respectively V,i and horizontally send the correlation matrix R H,i .
[0057] 3) Use the formula [5] and [6] to calculate Λ V,i and Λ H,i , respectively find out the main mode of user i in the vertical direction and the main mode in the horizontal direction and and the corresponding index l i and j i , go to step 6).
[0058] 4) User i uses the result of its channel estimation to calculate its vertical transmission correlation matrix R according to the formulas [3] and [4] V,i and horizontally send the...
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The invention discloses a three-dimensional beam forming space division multi-access adaptive transmission method adopting statistic channel state information. The method aims at increasing the spectrum use rate of a communication system and improving the power efficiency of the communication system. The method specifically includes the steps that for an FDD system, each user calculates statistic channel state information of the user according to a channel estimated result, the statistic channel state information refers to a main perpendicular mode, a main horizontal mode and corresponding indexes and is fed back to a base station; for a TDD system, the base station uses an uplink channel estimated result for calculating downlink statistic channel state information of the users; the base station selects two groups of service users according to the acquired statistic channel state information and conducts pre-code transmission on the two groups of users in two time slots. According to the three-dimensional beam forming space division multi-access adaptive transmission method adopting the statistic channel state information, system robustness is effectively improved and the high average mutual information quantity can be acquired with low calculation complexity.
Description
technical field [0001] The invention relates to a multi-user downlink transmission system for transmitting high-speed data by using a uniform planar antenna array, in particular to an adaptive transmission method for a multi-user downlink transmission system using statistical channel state information. Background technique [0002] In recent years, research on information theory has shown that multi-antenna technology can significantly improve the transmission rate of wireless communication systems. At present, the research on the point-to-point single-user system has basically reached a conclusion, while the research on the capacity and optimal transmission scheme of the multi-user system has attracted extensive attention of international scholars. The multi-user multi-antenna system can obtain good performance and large capacity because of its diversity gain, multiplexing gain and multi-user diversity gain, and it will become one of the key technologies of the new generati...
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IPC IPC(8): H04B7/0417
CPCH04B7/0452H04B7/0617H04B7/0626Y02D30/70
Inventor 李潇金石高西奇
Owner SOUTHEAST UNIV