User cooperation method based on backscattering under power domain non-orthogonal multiple access
A non-orthogonal multiple access and backscattering technology, used in power management, wireless communication, electrical components, etc., can solve the problems of degraded received signal quality, high energy consumption, self-interference, etc., to improve transmission reliability, reduce Power consumption, the effect of low power consumption
Inactive Publication Date: 2021-01-29
NAT UNIV OF DEFENSE TECH
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However, user cooperation based on full-duplex forwarding will introduce self-interference, causing users to degrade their own received signal quality when assisting other users
In addition, whether it is half-duplex forwarding or full-duplex forwarding, users as forwarding nodes need to first generate a local carrier, and then modulate the information onto the carrier for forwarding, which consumes a lot of energy
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[0041] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0042] Refer to attached figure 1 , the present invention proposes a user cooperation method based on backscattering under non-orthogonal multiple access in the power domain, which is specifically implemented through the following steps:
[0043] Step 1. Divide the downlink communication process between the base station and multiple users into continuous time blocks in time. In each time block, the base station encodes the information of all users through superposition coding based on the power domain non-orthogonal multiple access technology. To broadcast:
[0044] Based on the two-user scenario, for each time block, the user with better instantaneous channel condition is denoted as user 1, the user with poor instantaneous channel condition is denoted as user 2, and the power allocated by the base station to user 1 and user 2 is den...
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The invention belongs to the field of wireless communication, and discloses a user cooperation method based on backscattering under power domain non-orthogonal multiple access. The method comprises the following steps: enabling a base station to broadcast a downlink signal to a user based on a power domain non-orthogonal multiple access technology; enabling users with better instantaneous channelconditions to use part of received signal power for decoding based on a backscattering technology, and reflecting the rest received signals to the users with poorer instantaneous channel conditions soas to enhance the signal to interference plus noise ratio of the users with poorer instantaneous channel conditions; on the premise that the information rate requirement is met, adjusting the base station power distribution and the percentage of the power of each user for backscatter cooperation in the total received signal power, thereby achieving the purpose of minimizing the total power consumption of the base station. According to the invention, the transmission reliability and transmission effectiveness of the cellular network downlink communication system based on power domain non-orthogonal multiple access can be effectively improved, and compared with the existing forwarding cooperation method, the power consumption is further reduced.
Description
technical field [0001] The invention belongs to the technical field of wireless communication, relates to a backscatter-based user cooperation method and a corresponding optimal resource allocation method, and is applicable to a cellular network downlink communication system based on power domain non-orthogonal multiple access. Background technique [0002] Non-orthogonal multiple access technology realizes high spectral efficiency communication by carrying information of different users on the same frequency and time resources, and is considered to be a very promising multiple access method in the 5G and post-5G era. Among them, the non-orthogonal multiple access technology in the power domain allocates different power for different users based on superposition coding at the transmitting end, and uses continuous interference cancellation technology at the receiving end to achieve interference elimination and information recovery. Compared with other non-orthogonal multiple a...
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IPC IPC(8): H04W52/34
CPCH04W52/34H04W52/346
Inventor 陈炜宇丁海洋王世练李海鹏王昊辛可为胡礼
Owner NAT UNIV OF DEFENSE TECH