A TSE based design for MMSE and QRD of MIMO systems based on ASIP

A Taylor series expansion(TSE) based design for minimum mean-square error(MMSE) and QR decomposition(QRD) of multi-input and multi-output(MIMO) systems is proposed based on application specific instruction set processor(ASIP), which uses TSE algorithm instead of resource-consuming reciprocal and reciprocal square root(RSR) operations.The aim is to give a high performance implementation for MMSE and QRD in one programmable platform simultaneously.Furthermore, instruction set architecture(ISA) and the allocation of data paths in single instruction multiple data-very long instruction word(SIMD-VLIW) architecture are provided, offering more data parallelism and instruction parallelism for different dimension matrices and operation types.Meanwhile, multiple level numerical precision can be achieved with flexible table size and expansion order in TSE ISA.The ASIP has been implemented to a 28 nm CMOS process and frequency reaches 800 MHz.Experimental results show that the proposed design provides perfect numerical precision within the fixed bit-width of the ASIP, higher matrix processing rate better than the requirements of 5G system and more rate-area efficiency comparable with ASIC implementations.

Simplified MMSE Detectors for Turbo Receiver in BICM MIMO Systems

In this article, two methods adopting simplified minimum mean square error （MMSE） filter with soft parallel interference cancellation （SPIC） are discussed for turbo receivers in bit interleaved coded modulation （BICM） multiple-input multiple-output （MIMO） systems. The proposed methods are utilized in the non-first iterative process of turbo receiver to suppress residual interference and noise. By modeling the components of residual interference after SPIC plus the noise as uncorrelated Gaussian random variables, the matrix inverse for weighting vector of conventional MMSE becomes unnecessary. Thus the complexity can be greatly reduced with only slight performance deterioration. By introducing optimal ordering to SPIC, performance gap between simplified MMSE and conventional MMSE further narrows. Monte Carlo simulation results confirm that the proposed algorithms can achieve almost the same performance as the conventional MMSE SPIC in various MIMO configurations, but with much lower computational complexity.

一种针对新型冠状病毒肺炎的准确、快速、便携式双功能电检测仪

新型冠状病毒肺炎(COVID-19)正在多个国家快速传播,已经导致了严重的全球大流行.由于目前没有针对此类病人的特效药和针对此病毒的疫苗,准确、快速地进行新冠病人检测成为了控制大流行最有效的措施.本文中我们开发了一种基于石墨烯场效应晶体管的便携式双功能电检测仪,其通过核酸互补杂交或者抗原-抗体特异性结合作用,能分别进行病毒核酸序列检测和抗体检测,检测限分别低至0.1和1 fg mL^(-1).我们通过临床样品检测进一步评估了此方法:从10个新冠病人和8个正常人咽拭子中提取RNA直接用于核酸检测;从6个新冠病人和3个正常人血清中提取抗体用于抗体检测.临床样品检测结果和基于聚合酶链反应的光学方法结果完全吻合,同时此方法拥有超快的检测速度(核酸检测需10 min,抗体检测需5 min).因此,我们的实验提供了一种有效、准确、高通量的新冠现场即时检测工具.