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Multiuser scheduling method based on Tomlinson and Hashim precoding

A multi-user scheduling and precoding technology, which is applied to baseband system components, shaping networks in transmitters/receivers, electrical components, etc., can solve the problems of large throughput loss, difficult implementation, and high complexity

Inactive Publication Date: 2008-09-03
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

[0003] "On the optimality of multiantenna broadcast scheduling using zero-forcing beamforming" Selected Areas in Communications, IEEE Journalon, 2006.24(3): p.528-541) introduced a method using zero-forcing beamforming Beamforming technology is a low-complexity scheduling method that uses multi-user diversity gain, but due to the noise amplification introduced by zero-forcing beamforming, the power efficiency is low, and the throughput loss when using this method is large
[0004] "Scheduling Approach for MIMO with Tomlinson-Harashima Precoding".in Vehicular Technology Conference, 2006.VTC 2006-Spring.IEEE 63rd.2006. Hashim (Tomlinson-Harashima) precoding technology uses multi-user diversity gain optimization ergodic scheduling method, because this method needs to traverse all user sets, so when this method is used, the computational complexity of user scheduling still increases with the number of users And exponential growth, high complexity
[0005] "International Electronics and Electrical Engineers Communication Briefing" ("Multiuser diversity for a dirty paper approach". Communications Letters, IEEE, 2003.7(8): p.370-372) introduces a classic greedy method based on Dirty Paper Coding (DPC) The scheduling algorithm achieves better system throughput with a less complex scheduling algorithm, but DPC is a joint coding coding technology with high complexity and is not easy to implement in the actual system

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  • Multiuser scheduling method based on Tomlinson and Hashim precoding

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Embodiment 1

[0042] Assuming that this embodiment adopts a downlink multi-antenna multi-user system with K users, the maximum number of users that the system can support simultaneously is M, and the number of users is greater than or equal to the number of transmitting antennas, that is, K≥M. The base station has M transmitting antennas, and each user has one receiving antenna. Assuming that the base station can obtain the channel state information (CSI) of each user, h j is the channel vector from the base station to user j, each element of which is a complex Gaussian random variable that obeys independent and identical distribution, with a mean of 0 and a variance of 1.

[0043] Remember Ω i-1 is the user set to be selected when the i-th user is selected, S is the selected user set, S+{a} is a new set after adding a to the set S, S-{a} is the new set after removing the element a in the set S new collection, V S is the orthonormal basis of all selected users, K is the total number of u...

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Abstract

The invention is a multi-user scheduling method precoded by the Tomlinson-Hasheem, which is characterized in that in downlink multi-antenna multi-user system adopting Tomlinson-Hasheem precoding, in the process of subscriber selection, selecting the user which projects the maximal second order norm in the orthogonal space at the selected user channel space at every time; applying the heuristic Tomlinson-Hasheem method, adequately applying the projecting result of the user space orthogonal space in the selected set at the last user space so as to effectively reduce algorithmic complexity. Adopting the scheduling algorithm provided by the invention, the system throughput performance approaches to the capability of the downlink multi-user multi-antenna system, has progressive optimum performance. The inventive computation complexity is far less than traversal selective complexity and better than complexity of the classical greedy scheduling algorithm and suitable used in the practical system.

Description

technical field [0001] The invention belongs to the technical field of multi-antenna and multi-user in wireless communication, and in particular relates to a multi-user scheduling method in a multi-antenna multi-user system adopting Tomlinson-Harashima precoding. Background technique [0002] "Precoding in multiantenna and multiusercommunications" ("Precoding in multiantenna and multiusercommunications". Wireless Communications, IEEE Transactions on, 2004.3(4): p.1305-1316) pointed out that Tomlinson-Hashim (Tomlinson- Harashima) precoding is a non-linear precoding technique that effectively realizes space division multiple access in downlink multi-antenna multi-user systems. Multi-user diversity is an effective method to improve the spectral efficiency of a wireless system that has been extensively studied in the field of wireless communication multi-antenna multi-user technology. How to effectively select a user set that can communicate simultaneously to improve system pe...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/06H04L1/00H04L25/02H04L25/03
Inventor 史林邱玲
Owner UNIV OF SCI & TECH OF CHINA
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