For Lte-tdd Downlink Mimo Detector Realization

In recent years, wireless communication system is moving towards high speed, broadband direction with the rapid development of wireless communication technologies, and traditional time division multiplexing and frequency division multiplexing wireless network can no longer meet the requirements of data transmission. Large-scale commercialization of 3G wireless technology has taken off and 4G network studies have been launched in the world, including LTE-TDD which is a 4G standard based on TD-SCDMA standard. Multi-Input Multi-Output (MIMO) technology is one of the key technologies in LTE system. MIMO technology became popular because MIMO system significantly enhances spectrum utilization without increasing the system bandwidth and because transmit signal power under the premise of the system greatly increased channel capacity and data transfer rates. Signal detection is a key part of MIMO systems, especially terminal MIMO systems. How to achieve high performance, low-power MIMO signal detection is researched herein.The main research topics are algorithm optimization and circuit implementation for MIMO signal detection. Based on the metric-first algorithm, we propose three optimization schemes:namely fast bound radius, similar single jump for the complex enumeration and the redundant point reduction. Simulation results show that the computational complexity has reduced by 20% to 35% and the BER receiver performance is better, compared to that of tranditional algorithms. A suitable low-power, low-cost system circuit architecture is proposed, which is pipeline structure, combined iterative and limited state machines control. A data storage interface is designed for multi-antenna and multi-mode configuration. The MIMO siganal detector has been designed and taped out in SMIC0.13μm EEPROM process after FPGA functional verification. Simulation results based on SMIC0.13μm CMOS process show that when this chip is configured as 4x4 64-QAM, its power consumption is 10.5 mW, with the throughput of 268Mbps, while the normalized power consumption of the MIMO detector has been reduced by 30% -50% compared to that of other published literatures.