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Uplink multiple-user space division multiplexing method in OFDMA system

A space-division multiplexing, multi-user technology, applied in the field of mobile communication and channel multiplexing, can solve the problems of small channel matrix condition number, affecting data demodulation, and inability to demodulate and multiplex user data, etc. The effect of improving reliability

Inactive Publication Date: 2010-12-08
ZTE CORP
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Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide an uplink multi-user space division multiplexing method in an OFDMA system, which can overcome the inability to demodulate and multiplex user data caused by the small condition number of the channel matrix after multiplexing and the influence that has been allocated to the Data demodulation for sub-channel users

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  • Uplink multiple-user space division multiplexing method in OFDMA system
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  • Uplink multiple-user space division multiplexing method in OFDMA system

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Embodiment Construction

[0033] First, explain the basis of the present invention: multi-user joint space division multiplexing needs to independently complete the spatial channel estimation from different MSs to BS, and its pilot data structure will be different from that of the non-spatial multiplexing system. The area of ​​multi-user joint space division multiplexing needs to be opened separately. In this area, multi-user joint space division multiplexing may not be performed, and each sub-channel sub-carrier has only one MS corresponding to it, or joint space division multiplexing may be performed, and one sub-channel sub-carrier corresponds to multiple MSs. The independently divided area is composed of the sub-channel as the basic resource allocation unit, and the sub-channel is composed of the basic multiplexing unit.

[0034] (1) User access: When accessing users, you must first listen to the channel and select sub-channels with low channel correlation for multiplexing. During the communication p...

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Abstract

The invention relates to a spatial multiplexing method for uplink multiple users in an OFDMA system, which adopts an MIMO to carry out the combined spatial multiplexing for the uplink multiple users between a multi-antenna mobile terminal MS and a multi-antenna base station BS. The method includes the following processes: the access of the spatial multiplexing user are listened through frame in channels and a sub-channel which meets the requirement of an threshold of channel matrix condition number H can be processed by the spatial multiplexing and distributed to the user; in communication, if the channel matrix condition number of the multiplexed sub-channel is less than the threshold, the multiplexing sub-channel in a non-space which meets the requirement of the threshold of the channelmatrix condition number H is distributed to the user again. The invention use the frame-listening in channels and the threshold of the channel matrix condition number H to ensure the condition that communication quality of the accessed users replaces channel capacity maximum at any moment. The multiplexed sub-channel is adjusted. The invention always ensures that the spatial multiplexing channel meets the communication conditions, and the prior user and spatial multiplexing user are further distinguished, thus guaranteeing the communication quality of the prior user.

Description

Technical field [0001] The invention involves mobile communications and channel replication, and specifically involves a multi -user vacancy method in an OFDMA system. Background technique [0002] Orthodox frequency division uses OFDM to divide the channel into several orthogonal channels, convert high -speed data signals into parallel low -speed sub -data streams, and modulate them to each sub -channel for transmission.The orthogonal signal is separated by the relevant technology through the receiving end. Under certain conditions, you can reduce the interference interference interference interferery inter-carrier-interference, referred to as ICI.The signal bandwidth of each sub-channel is smaller than the related bandwidth of the channel, so each sub-channel can be regarded as a flat and declining channel, thereby eliminating interference interference inter-Symbol-Interference between symbols, referred to as ISI.Since the bandwidth of each sub -channel is just a small part of ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L5/02H04W16/10H04L27/26
Inventor 赵路
Owner ZTE CORP
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