MIMO-based pilot allocation method and device

Abstract

Provided are a pilot frequency allocation method and device based on MIMO, the method comprising: if the total number of demodulation reference signal (DMRS) ports corresponding to a sector to be managed is less than the total number of wave beams on the sector to be managed, then grouping the wave beams on the sector to be managed in a preset direction so as to obtain at least two first groups, and respectively numbering the wave beams in each of the first groups in the preset direction; respectively allocating a corresponding DMRS port for each wave beam in each of the first groups; allocating the same DMRS port for the wave beams having the same number in different first groups; and respectively determining a matching wave beam corresponding to each user terminal on the sector to be managed, and determining a DMRS port matching the user terminal according to the DMRS port allocated for the matching wave beam. The embodiment of the present invention removes the limit of maximum matches on the number of user layers in the prior art, and effectively improves demodulation performance.

Description

technical field [0001] Embodiments of the present invention relate to communication technologies, and in particular to a MIMO-based pilot allocation method and device. Background technique [0002] Currently, multiple-input multiple-output (MIMO for short) is generally divided into single-user multiple-input multiple-output (Single-User MIMO, SU-MIMO for short) and multi-user multiple-input multiple-output (Multi-User MIMO, short for MIMO). MU-MIMO) two types; wherein, SU-MIMO refers to a point-to-point antenna link between a base station and a user. MU-MIMO means that several users use the same time domain and frequency domain resources to communicate with a base station at the same time. Since MU-MIMO can transmit multiple space-division multiplexed data streams to different users at the same time, the gain of MU-MIMO is particularly obvious as the number of base station transmit antennas increases. For example, the largest space-division multiplexing The number of data ...

AI Technical Summary

Problems solved by technology

[0004] Due to the limitations of existing standards, the two pilot ports can only limit the number of layers (that is, the number of data streams) of the maximum paired users to no more than 4 layers, (2 orthogonal pilots port7 and port8, the same pilot port Two scrambling codes), when two dual-stream users are paired, although there are two scrambling codes on port7 and port8, the pilot frequency for scrambling code distinction cannot be guaranteed to be orthogonal. Similarly, if two single Streaming users multiplex an orthogonal pilot port, and the pilots distinguished by scrambling codes cannot guarantee orthogonality. Therefore, the DMRS interference between users who transmit pilots with the same pilot port at the same time is very serious, which leads to inaccurate DMRS channel estimation. Accurate, demodulation performance deteriorates

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