DoCoMo Beijing Institute pushes 8 × 8 MIMO-OFDMA real-time transmission
DoCoMo Beijing Institute launches 8 × 8 MIMO-OFDMA real-time transmission experiment platform
Ducomo (Beijing) Communication Technology Research Center (hereinafter referred to as "Beijing Research Institute") has successfully developed an 8-transmit 8-receive multiple input multiple output orthogonal frequency division multiple access system (MIMO-OFDMA) real-time transmission experimental platform, based on the field Programmable gate array (FPGA).
The Beijing Research Institute was established in November 2003. It is the third research center of NTT DOCOMO established overseas in addition to the R & D headquarters in Japan.
For many years, the Beijing Research Institute has mainly conducted research on transmission and radio control technologies for LTE systems, IMT-Advanced systems and more next-generation systems. In 2009, the research on time division duplex mode transmission technology began to promote the development of TD-LTE-Advanced. The hardware implementation of the 8-transmit, 8-receive, multiple-input and multiple-output detection algorithm that has been completed can be regarded as the first step in the research of the TD-LTE-Advanced system using a maximum of 8 antennas.
The experimental platform uses a 5 megabit frequency bandwidth and 16QAM modulation method, and successfully achieved a transmission rate of about 80 Mbps in the laboratory test (spectrum utilization rate is 21 bit / s / Hz).
At the receiving end, the experimental system uses a self-developed detection algorithm based on orthogonal grouping to approach optimal performance. Using this algorithm, the detection complexity at the receiving end can be reduced by almost half or more compared to the original scheme. In terms of hardware, signal processing based on FPGA boards can use software radio to flexibly and quickly change the transmission scheme.
NTT DoCoMo has successfully conducted an outdoor real-time transmission experiment of a 4-transmission 4-receive multi-input multi-output system. The system uses a bandwidth of 100 MHz and reaches a maximum transmission rate of 1 Gbps. Moreover, the outdoor experiment of the 12-issue 12-receive multi-input multi-output system has also been completed. With a 10MHz frequency bandwidth and 64QAM modulation, the system has reached a maximum rate of 5Gbps. The research focus of the Beijing Research Institute is also for the LTE-Advanced 8-transmit 8-receive multiple-input multiple-output system, and has developed a lower complexity detection algorithm for high-order multiple-input multiple-output systems to develop low-cost, low-energy LTE -Advanced system network equipment.
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