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Multi-cell blind interference alignment method for eliminating cross time slot interference under dynamic TDD
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A cross-slot interference and multi-cell technology, which is applied in the field of communication, can solve the problems of high overhead, unavoidable inter-cluster interference, cross-slot interference, etc., and achieve a high degree of freedom
Active Publication Date: 2021-07-13
SOUTHEAST UNIV
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However, the use of dynamic TDD will cause cross-slot interference, and due to the high power of the base station, the impact of inter-base station interference is more serious
In order to solve the impact of cross-slot interference, some researchers proposed a cell clustering interference mitigation method, which can avoid cross-slot interference within the same cluster but cannot avoid inter-cluster interference.
In addition, many researchers have proposed methods based on beamforming and interference alignment, but these methods require channel state information at the transmitter or require more feedback, resulting in considerable additional overhead.
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Embodiment 1
[0045] m 1 =5N 1 = 2M 2 =7N 2 = 2M 3 =3N 3 = 2 case
[0049] Table 2 gives the M 1 =5N 1 = 2M 2 =7N 2 = 2M 3 =3N 3 = 2 The sending and receiving process of each cell.
[0050]The whole process has a total of 42 time slots, as shown in the table, where the users of the first cell send a total of 10 independent 5×1 signals, which are recorded as x i (i=1,2,3,4,5,6,7,8,9,10), the second base station sent a total of 12 independent 7×1 signals, denoted as y i (i=1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12), the users in the third cell sent a total of 15 independent 3×1 signals, denoted as z i (i=1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15). It can be seen from Table 2 that in the first 30 time slots, all three cells are sending signals, and in the last 12 time slots, only base station 2 is sending signals. At this time, the first base station and the third base statio...
Embodiment 2
[0077] m 1 =5N 1 = 4M 2 =8N 2 = 2M 3 =7N 3 = 4 case
[0081] Table 3 gives the M 1 =5N 1 = 4M 2 =8N 2 = 2M 3 =7N 3 = The sending and receiving process of each cell in the case of 4.
[0082] The whole process has a total of 16 time slots, as shown in the table, where the users of the first cell send a total of 6 independent 5×1 signals, which are recorded as x i (i=1,2,3,4,5,6), the second base station sent a total of 4 independent 8×1 signals, denoted as y i (i=1,2,3, the users in the third cell sent a total of 6 independent 7×1 signals, denoted as z i (i = 1, 2, 3, 4, 5. It can be seen from Table 3 that in the first 12 time slots, all three cells are transmitting signals, while in the last 4 time slots only the second base station is transmitting At this time, the first base station and the third base station only receive the interference signal of the second b...
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Abstract
The invention discloses a multi-cell blind interference alignment method for eliminating cross time slot interference under dynamic TDD, which focuses on eliminating interference among base stations due to small interference among users, and in the blind interference alignment method, a sending end does not need to know channel state information. The implementation process is mainly divided into two parts: in the first part, a user of an interfered cell and an interference source base station transmit signals together; in the second part, only the interference source base station transmits the signal, so that the interfered base station only receives the interference signal, and the interference signal is eliminated in the previous received signal. In order to cancel interfering signals, the proposed scheme uses smart reflectors or reconfigurable antennas to control channelmodes. According to the invention, interference can be eliminated, and the degree of freedom is high.
Description
technical field [0001] The invention belongs to the technical field of communication, and particularly relates to a blind interference alignment scheme for solving cross-slot interference generated by a single cell to two adjacent cells in a dynamic time division duplex (TDD) system. Background technique [0002] One of the key features of the fifth-generation mobile communication network is the deployment of ultra-dense small cells. The TDD-based air interface is proposed to be applied to the transmission of small cell signals, where the uplink and downlink transmission resources of each subframe can be flexibly allocated. This kind of TDD in which uplink and downlink configurations are flexibly selected is also called dynamic TDD. Dynamic TDD has high time resource utilization (some cells may not send or receive signals in the case of unified configuration) (Hyejin Kim, Jintae Kim, Daesik Hong, "DynamicTDD Systems for 5G and Beyond: A Survey of Cross-link Interference Miti...
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