A non-orthogonal multiple access method based on time-division multiplexing and multi-antenna downlink
A non-orthogonal multiple access and downlink technology, applied in the field of non-orthogonal multiple access, can solve the problems of unobtainable channel state information, poor antenna and system performance, etc., to achieve resource overhead, improve performance, and realize Effects with low complexity
Active Publication Date: 2018-11-27
ZHEJIANG UNIV
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[0005] The purpose of the present invention is to solve the problems in the above schemes that the channel state information cannot be obtained, the mobile terminal needs to configure more antennas and the system performance is poor, and proposes a non-orthogonal multiple access based on time division multiplexing multi-antenna downlink entry method
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[0030] The block diagram of non-orthogonal multiple access based on time division multiplexing multi-antenna downlink is as follows: figure 1 As shown, the base station has N t root antenna. Due to size limitation, only one antenna is configured for each mobile terminal. The uplink and downlink channels of the system work in the same frequency band, that is, each data frame is divided into an uplink part and a downlink part. The base station divides the mobile terminals into multiple clusters, and each cluster contains a small number of terminals to reduce the complexity of serial interference cancellation. The base station obtains the state information of the downlink channel by estimating the uplink channel, and uses the estimated channel state information to design transmit beams to reduce inter-cluster interference. After the mobile terminal receives the information, it performs serial interference cancellation on the signals in the cluster to further reduce the interfe...
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The invention discloses a Time-division-multiplexing-based non-orthogonal multi-access method for multi-antenna downlink. A base station divides a mobile terminal into a plurality of clusters according to the long-term statistical information of the channel, and each cluster contains a small number of mobile terminals so that the mobile terminals perform low-complexity successive interference cancellation. The mobile terminals can simultaneously emit a training sequence so that the base station can estimate the instantaneous channel state information. The base station superimposes and encodes the emitted signals of each cluster according to the obtained instantaneous channel state information, and then emits the superimposed signals through wave beam forming to reduce the interference among the clusters. After the mobile terminals receive the signals, the mobile terminals first decode the signals of the mobile terminal with weak channel gain in the same cluster and subtract the signals from the received signals of these terminals and then decode their own signals. Based on the time division multiplexing broadband mobile communication system, a simple yet effective non-orthogonal multi-access method is provided.
Description
technical field [0001] The present invention relates to the field of wireless communication, in particular to a non-orthogonal multiple access method based on time-division multiplexed multi-antenna downlink. Background technique [0002] Non-orthogonal multiple access (NOMA) technology uses the difference in the power domain of multiple access channels to support multiple wireless devices to share the same resource block at the same time, which can greatly improve the utilization efficiency of spectrum resources, so it is regarded as the first It is a key access technology of the fifth generation mobile communication system. [0003] In a non-orthogonal multiple access system, since multiple users share the same spectrum resource, inter-user interference inevitably exists. Although some interference can be eliminated by using interference cancellation technology at the user end, redundant interference still seriously limits the performance of non-orthogonal multiple access...
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IPC IPC(8): H04W72/00H04B7/06H04B17/309
CPCH04B7/0617H04B17/309H04W72/046H04W72/0473
Inventor 陈晓明张朝阳钟财军
Owner ZHEJIANG UNIV