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A technology for receiving signals and users, applied in the field of communication, can solve the problem of not being able to carry too many users, and achieve the effect of ensuring fairness and improving system user capacity
Active Publication Date: 2016-12-07
DATANG MOBILE COMM EQUIP CO LTD
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[0005] Embodiments of the present invention provide a method and device for multiple access to solve the problem that the traditional power domain non-orthogonal multiple access scheme in the prior art cannot carry too many users
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Embodiment 1
[0181] Embodiment 1: Taking 5 users as an example, according to the power allocation method of the present invention, assuming that the users are divided into 2 groups according to the channel estimation results, there are 2 users in the first group, and 3 users in the second group , the simulation results are shown in the table below:
[0182] Table 4
[0183] (correspondence relationship between user power and rate in the group and signal-to-noise ratio)
[0184] P / N0(dB) (Normalized P)
[0185]It can be seen from the test results in Table 4 that, according to the power allocation algorithm proposed in the present invention, all users in the system can have the same reachable rate, which ensures the fairness of each user in the system.
Embodiment 2
[0186] Embodiment 2: In the MMSE-SIC detection method, the received power is first sorted in a descending manner, and according to the sorted order, the minimum mean square error algorithm is used for detection. Only detect the sum signal of one group at a time, then subtract the reconstructed sum signal of the group with the strongest power from the total received signal, then reconstruct and cancel the next strongest interference, and so on, until all the signals sent by the user are detected group of sum signals. The above processes of sorting, detecting, reconstructing, and canceling the next strongest interference to the sum signals of all groups comply with the serial interference cancellation criterion.
[0187] refer to Figure 10 As shown, user 1's signal b 1 ∈{-1,+1}, user 2's signal b 2 ∈{-1,+1}, assuming that the user 2 signal is rotated 90 degrees and superimposed on the user 1 signal, according to b 1 ,b 2 The value of , the two user signals can only be A, B...
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Abstract
The invention relates to the field of communication, and in particular relates to a multi-access method and device, used for improving the user capacity of a system. The method comprises the following steps: a base station obtains channel state information reported by users, and divides the users into multiple user groups based on the obtained channel state information; the base station distributes the sending power to the users in each corresponding group based on the number of the users in each group and an achievable rate expected value; the base station determines the signal to noise rate of the users in each corresponding group according to the sending power of the users in each group, and determines the rotation angle of each user in each group based on the number of the users in each group and the signal to noise rate; and the base station sends the sending power and the rotation angle of each user to corresponding users. The user capacity of the system can be effectively increased; and the fairness of each user in the system is ensured.
Description
technical field [0001] The present invention relates to the communication field, in particular to a method and device for multiple access. Background technique [0002] Multiple access technology plays an important role in wireless communication systems, and traditional orthogonal multiple access technology has been difficult to improve spectrum utilization. The non-orthogonal multiple access technology in the power domain is different from the traditional orthogonal multiple access technology. It does not divide time-frequency domain resources and can achieve higher spectrum utilization. [0003] A single power domain non-orthogonal multiple access method is proposed in the prior art to solve the problem of how to distinguish users in the power domain. Wherein, the base station performs unequal power allocation to different users based on the pre-acquired channel conditions of the users. Each user sends a signal to the base station on the same time-frequency domain resour...
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