低精度量化下VMIMO-OFDMA中继传输技术的研究

Research on VMIMO-OFDMA in relay transmission technology with low-precision quantization

网络中的一些边缘用户达不到高速率传输的信道条件,为此文中通过中继用户辅助传输能形成一种虚拟的MIMO(VMIMO),并对低精度量化下的VMIMO-OFDMA中继传输技术进行了研究。通过性能分析与仿真表明,尽管低精度量化会引入量化噪声,但是随着中继协同用户数的增多,并且在到达一定比特数时,性能趋于稳定。特别是当量化比特数达到3比特时,系统性能接近理想ADC性能。这对于单用户来说,特别是移动便携设备而言是很有意义的,通过多用户的协同通信,在保证了可靠通信的情况下,减小了功耗和复杂度。

Some edge users in the network can not reach the channel conditions of high-speed transmission.Therefore,we form a virtual MIMO(VMIMO)system through relay user-assisted transmission,and studies the VMIMO-OFDMA relay transmission technology with low-precision quantization.The performance analysis and simulation show that the low-precision quantization will lead to quantization noise.However,with the increase of the number of relay cooperative users,the performance tends to be stable when some quantization bits are reached on a certain level.Especially when the bits reach 3,the system performance would be close to the perfect ADC’s performance.It is meaningful for single user,especially for mobile portable devices.Through multi-user cooperative communication,the power consumption and complexity are reduced while reliable communication is guaranteed.