Multiuser MIMO (multiple-input multiple-output) downlink transmitting and dispatching method

Abstract

The invention discloses a multiuser MIMO (multiple-input multiple-output) downlink transmitting and dispatching method comprising the following steps of: (1) transmitting a pilot signal by a transmitting end; (2) receiving the pilot signal by a receiving end, carrying out channel estimation, and then, transmitting a feedback signal to the transmitting end; (3) receiving the feedback signal by the transmitting end through an uplink channel and obtaining channel matrixes of all users by the transmitting end through the feedback signal; (4) initializing a user set by the transmitting end; (5) determining an optional user set by the transmitting end; (6) selecting users from the optional user set by the transmitting end; (7), constructing a block diagonal beam matrix by the transmitting end; and (8) starting data communication. The multiuser MIMO downlink transmitting and dispatching method combines volume upperbound maximization and proportional fairness algorithm, ensures system justification by adding the optional user set in a user set selecting process, and ensures system volume by selecting a user who can make a system volume upperbound maximum from the optional user set.

Description

technical field [0001] The invention belongs to wireless communication transmission technology, in particular to a multi-user MIMO downlink transmission scheduling method, which relates to multiple-input multiple-output (MIMO) wireless communication transmission technology and user selection technology. Background technique [0002] With the rapid development of wireless communication services, the sharp increase in the number of users and the rapid rise of wireless broadband services, the next-generation mobile communication system (4G) technology or standard is now being closely studied, and it will be suitable for all mobile communication users. When the user moves at high speed, the data transmission rate reaches 100Mbps, and reaches 1Gbps in static or low-speed mobile mode. It has the characteristics of high speed, high service quality assurance, wide coverage, low maintenance cost, and high security. [0003] Multiple Input Multiple Output (MIMO) is a technology that u...

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Problems solved by technology

The article "Low ComplexityMultiuser MIMO Scheduling with Channel Decomposition" published by Z.Xiaojie and L.Jungwoo at the Fortieth Asilomar Conference proposes a low-complexity user selection scheme, which selects users based on maximizing the upper bound of the system capacity. However, The fairness of the scheduling system based on this scheme is often poor

The article "Opportunistic beamforming using dumbantennas" published by P.Viswanath and R.Laroia on Information Theory mentioned a proportional fair user scheduling method, which can guarantee the fairness of the system. However, the traditional proportional fair algorithm sacrifices the reuse of the system. gain, so there will be a large loss in system capacity

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