Multi-User (MU) MIMO is playing an increasingly important role in wireless communications. As the antennas scale continues to grow, it is expected to fully explore freedom in the space domain in order to support more user access but under the premise of solving interferences in a good way. To address this issue, we construct a new three-dimensional (3D) scrambling code (SC) set for the MU-MIMO systems to reduce the interferences among users in the fading channels. In the proposed scheme, different users can share the same frequency-time block and keep orthogonality in the 3D SC domain without channel information feedback. Besides, it is found that the number of users increases linearly along with the number of transmit antennas. Furthermore, different from the spreading code used in a typical code division multiple access (CDMA) system, the proposed 3D SC can achieve the perfect correlation properties even without spreading the spectrum. In this paper, the capacity of the 3D SC MU-MIMO is discussed in detail, and the bit error rate (BER) performance is evaluated via the simulation results.
Three-Dimensional Scrambling Code for Multi-User MIMO Systems
2022-06-01
997082 byte
Conference paper
Electronic Resource
English
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