A precoding method and system based on user-based statistical channel state information

Abstract

The invention discloses a user-based precoding method and a user-based precoding system of statistical channel state information. The method comprises the following steps of dividing users into statistical users and instantaneous users according to channel states of the users, and obtaining statistical CSI (Customer Satisfaction Index) of all of the statistical users and instantaneous CSI of all of the instantaneous users by a base station; for each statistical user, calculating orthogonal subspace orthogonal to channel space of other users, and designing a precoding vector of the statistical user by utilizing the orthogonal subspace; obtaining orthogonal subspace, of all of the instantaneous users, which is orthogonal to channel space of all of the statistical users, and designing a precoding matrix of all of the instantaneous users by utilizing the orthogonal subspace. According to the method, only the statistical CSI of the users is utilized, the number of the users served by the base station is not limited, the users only with the statistical CSI and the users with the instantaneous CSI can be simultaneously served, and the disturbance between two types of the users can be effectively avoided.

Description

technical field [0001] The present invention belongs to the field of multi-antenna and wireless communication technologies, and more specifically relates to a precoding method and system based on statistical channel state information of users. Background technique [0002] In the past few decades, Multiple Input Multiple Output (MIMO) has been widely used. This technology can significantly improve the spectrum utilization of wireless systems without increasing additional bandwidth and power loss. However, with the popularity of smart phones, modern communication systems require higher data transmission rates and system throughput. To solve this problem, people have gradually launched research on massive MIMO systems. Massive MIMO systems can provide higher spectrum utilization and system throughput. [0003] However, the precoding strategy adopted by the base station will seriously affect the performance of the massive MIMO system. Most of the existing precoding methods are...

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Problems solved by technology

[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides a precoding method and system based on user statistical channel state information, which solves the problem of accurate instantaneous CSI of users in massive MIMO systems by only using statistical CSI of users. It is difficult to obtain, and the problem of large amount of calculation for channel estimation; in addition, this method does not limit the number of users served by the base station, and can serve users with only statistical CSI and users with instantaneous CSI at the same time, and can effectively avoid the difference between the two types of users. interference between

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