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A Mode Selection Method Based on Cache Assist and User Pairing
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A technology for user pairing and mode selection, applied in the field of network information transmission, it can solve the problems of inability to decode by users, high decoding complexity, and limited computing power, and achieve the effect of reducing decoding complexity and increasing the average transmission rate of the system.
Active Publication Date: 2022-01-14
SOUTHWEST JIAOTONG UNIV
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[0004] In addition, in the downlink multi-user cooperative non-orthogonal multiple access system, if multiple users use serial interference cancellation decoding, it will lead to extremely high decoding complexity, and even due to the limited computing power, some channel conditions will Bad users can't decode
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Embodiment 1
[0021] Embodiment 1: There is no direct link between the base station and the user
[0022] Hypothesis: h sr , h r1 , h r2 , h r3 , h r4 are the channel gains of base station-relay, relay-user 1, relay-user 2, relay-user 3, and relay-user 4, the transmit power of the base station and the relay are both P, and the noise of the user end is Gaussian White noise with a variance of 1, the instantaneous channel gains of all channels are perfectly estimated before information transmission.
[0023] Step 1: Complete User Pairing
[0024] First, the instantaneous channel gain of the relay to each user is ranked, and then according to the scheme of pairing the user with the best channel condition with the user with the worst channel condition, the user with the first instantaneous channel gain is paired with the user with the fourth rank, and the user with the second rank is ranked second. The user and the third-ranked user are queued. Assume that after queuing, the channel gain ...
Embodiment 2
[0032] Embodiment 2: There is a direct link between the base station and the user
[0033] Hypothesis: h s1 ,h s2 ,h s3 ,h s4 ,h sr ,h r1 ,h r2 ,h r3 ,h r4 Respectively base station-user 1, base station-user 2, base station-user 3, base station-user 4, base station-relay, relay-user 1, relay-user 2, relay-user 3, relay-user 4 The channel gain of , the transmit power of the base station and the relay are both P, the noise of the user end is Gaussian white noise with a variance of 1, and the instantaneous channel gains of all channels have been perfectly estimated before information transmission.
[0034] Step 1: Complete User Pairing
[0035] Arrange the instantaneous channel gains from the base station to each user and from the relay to each user, and then match the user with the best channel condition with the user with the worst channel condition, so that the user with the highest instantaneous channel gain and the user with the fourth Users are paired, and the sec...
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Abstract
The invention discloses a mode selection method based on cache assistance and user pairing. In a downlink multi-user cooperative non-orthogonal multiple access network, a base station directly transmits information to a user, or first transmits the information to a relay, and the relay temporarily stores the information in a In the data buffer or directly transmit the information to the user; for each time slot of information transmission, multiple users are first paired according to the best channel condition user pairing with the worst channel condition user. When there is a direct link, the base station- Select the best transmission mode among the three modes of user, base station-relay, and relay-user; when there is no direct link, select the best transmission mode among the two modes of base station-relay and relay-user. The user matching method adopted in the present invention effectively reduces the system decoding complexity; according to the instantaneous signal-to-dryness ratio, each transmission mode is dynamically scheduled, which provides a higher system average transmission for the downlink cooperative non-orthogonal multiple access system rate.
Description
technical field [0001] The invention relates to the technical field of network information transmission, in particular to a mode selection method based on cache assistance and user pairing. Background technique [0002] Non-orthogonal multiple access technology is a promising multiple access scheme and has become one of the key candidate multiple access technologies for the fifth generation (5G) and future wireless networks. Non-orthogonal multiple access technology provides services for multiple users on the same resource block at the same time. It can not only provide higher spectral efficiency and larger network capacity, but also support a large number of links. It is the future wireless communication for ultra-large-scale Internet of Things One of the key access technologies. In a non-orthogonal multiple access network with a large number of users, because the channel conditions of the edge users are too poor, in order to ensure fairness, it is necessary to provide hig...
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