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power distribution method in a downlink NOMA system

A distribution method and power technology, applied in the field of communication, can solve problems such as inapplicability

Active Publication Date: 2019-05-28
芯瑞微(上海)电子科技有限公司
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  • Abstract
  • Description
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Problems solved by technology

However, this method is limited to scenarios where each cluster contains two users, and is not suitable for scenarios where each cluster contains multiple users

Method used

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Embodiment Construction

[0050] An embodiment of the present invention is given below to further describe the present invention in detail. Such as figure 1 As shown, consider a downlink NOMA system including 1 base station and MK users, and both the base station and the users are configured with a single antenna. Users are divided into K clusters, each cluster contains M users, and u km Indicates the mth user in the kth cluster, k=1,2,...,K, m=1,2,...,M. base station to u km The channel is h km ,|h k1 | 2 ≥|h k2 | 2 ≥…≥|h kM | 2 . The total power allocated by the base station for the kth cluster is p k , where u km the power of p km ,p k1 ≤p k2 ≤…≤p kM , The base station allocates a sub-frequency band to each cluster, and the sub-frequency bands between clusters are orthogonal.

[0051] use y km means u km received signal, y km The expression form is

[0052]

[0053] where x km is u km The expected received signal, n km is u km The received Gaussian white noise has a mean ...

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Abstract

The invention discloses a power distribution method in a downlink NOMA system, which is suitable for the downlink NOMA system comprising one base station and MK users, and the base station and the users are provided with single antennas. The base station clusters the users and allocates orthogonal sub-bands to the user clusters; the base station sends the channel condition and the rate requirementof each user; calculates the minimum total power required by each cluster and the minimum total power required by the system; the minimum total power required by the system is used as a constraint condition; constructs a power distribution optimization problem of maximizing the sum of rates of all users in all clusters; The problem is converted into a power distribution optimization sub-problem for maximizing the total rate in a single cluster, each sub-problem is solved, power distribution between clusters is solved on the basis of the sub-problems, and power is distributed to each user in the single cluster with the goal of maximizing the total rate of the cluster according to the inter-cluster power distribution result.

Description

technical field [0001] The invention belongs to the communication field, in particular to a power allocation method in a downlink NOMA system. Background technique [0002] Faced with the demand for massive data services, how to access more users on limited resources is one of the key issues to be solved in the fifth generation mobile communication. Non-Orthogonal Multiple Access (NOMA) technology multiplexes signals of multiple users onto the same resource, which greatly increases the number of user connections, improves network throughput, and improves system spectrum efficiency. NOMA superimposes the signals of different users in the power domain at the sending end, and the power of each user’s signal received at the receiving end is different, and serial interference cancellation (Successive Interference Cancellation, SIC) is performed according to the difference in received signal power, and Detect own desired received signal. Power allocation is not only related to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W52/24H04W52/28H04W52/30H04W52/36
Inventor 田心记任铭李晓静张丹青
Owner 芯瑞微(上海)电子科技有限公司
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