Closed-loop transmit diversity systems with hybrid antenna selection

The paper investigates closed-loop transmit diversity （CLTD） systems with antenna selection technique. The expected received signal-noise-ratio （RxSNR） of the proposed systems is analyzed and compared with CLTD systems. An algorithm is proposed for determining the number of increased transmit antennas in terms of a reduced RF chains without performance degradation. Since a feedback channel is bandwidth-limited, we present a method of quantizing transmit-weight vectors. Simulation results demonstrate advantage of the proposed systems with full and quantized feedback information. Quantized feedback has less effect on the proposed systems than CLTD systems.

甜梦胶囊对慢性淋巴细胞性甲状腺炎TGA、TMA的影响

目的:探讨甜梦胶囊对慢性淋巴细胞性甲状腺炎(CLTD)患者抗甲状腺球蛋白抗体(TGA)及抗甲状腺微粒体抗体(TMA)的作用影响。方法:60例CLTD者随机分为观察治疗组(30例)及常规治疗组(30例),两组伴甲亢或甲减者分别采用抗甲状腺药物或甲状腺素等常规治疗,观察治疗组在常规治疗基础上联合甜梦胶囊并用。以放射免疫分析患者治疗前后及30例正常人的血清TGA、TMA水平。结果:观察治疗组临床疗效显著高于常规治疗组(P<0.05与P<0.01),治疗前后两种抗体下降水平也具有重要的统计学意义(P<0.01)。结论:甜梦胶囊对CLTD疗效肯定,TGA、TMA浓度降低可能是其提高机体免疫力的药理作用机制之一。