可见光通信系统接收机的优化设计与性能分析

文章在室内多小区可见光通信（VLC）系统中设计了一种使用视场角（FOV）不同的两种光电二极管（PD）的角度分集光接收机（2FOV-ADR）,并且以面积频谱效率（ASE）最大化为目标进一步对接收机进行参数优化,包括接收机PD的仰角以及采用的合并方式。考虑了4种合并方案,即等增益合并（EGC）、选择合并（SBC）、最大比合并（MRC）和最小均方误差（MMSE）合并。作为对比,也仿真了单PD接收机（SR）和传统角度分集接收机（ADR）的室内信干噪比（SINR）分布及ASE性能。仿真结果表明,2FOV-ADR极大地改善了室内SINR分布,相比于单PD接收机和传统ADR,小区边缘位置处的SINR分别得到30和20 dB的改善,并且在不同用户数下,2FOV-ADR都具有最高的ASE。因此,2FOV-ADR可以实现比单PD接收机和传统ADR更优的性能

基于透镜天线阵的毫米波系统波束选择研究

透镜天线阵列下毫米波大规模多输入多输出(MIMO)系统通过波束选择可以大大减少所需的射频链数目，解决系统硬件成本和能耗过高的问题，然而，波束选择需要基站端获取准确的信道状态信息。对此，文章首先利用波束空间的结构特性，采用基于支持检测(SD)的信道估计方案，以较低的导频开销和计算复杂度对大尺寸信道进行更加可靠的估计；其次受仿生学中蚁群优化(ACO)算法的启发，文章提出了一种基于SD估计信道的ACO波束选择方案，该方案既能有效地避免用户间波束的干扰，又能最大限度地提高系统和速率；最后，仿真结果表明，该方案能够得到计算复杂度显著降低的近优解，在提高系统和速率方面优于现有方案

基于棱镜阵列接收机的多小区可见光系统研究

可见光通信具有环保、安全和能耗低等优点,是第5代移动通信的一个强有力补充。针对多小区多用户多输入多输出可见光通信系统中小区间干扰的问题,文章提出使用基于棱镜阵列的非成像接收机作为接收设备,并讨论了两种多小区划分方案来降低小区间干扰的影响,第1种是动态小区,第2种是非动态小区。仿真结果表明,经过光电探测器选择后,这两种方案都能有效地消除小区间干扰的影响。当用户处于干扰区时,动态小区方案的误比特率（BER）性能更优,但是其计算复杂度较高。当用户都处于非干扰区时,这两种方案的BER性能相同

Concomitant therapy with cefmenoxime and cefsulodin for refractory complicated urinary tract infection (especially caused by Pseudomonas aeruginosa)

CMX, CFSの併用療法を, 難治性で緑膿菌感染が疑われる複雑性尿路感染症を対象に行った.1)効果判定症例91例中総合有効率は73%であった.これらのうち緑膿菌検出例44例では75%, その他の細菌による感染例47例では70%の有効率であった.2)疾患病態群別総合臨床効果はカテーテル留置群を含めいずれの群でも60%以上の有効率を示した.3)細菌学的効果は全体で91%の消失率であり, そのうち緑膿菌82%, セラチア100%, シトロバクター100%, クレブシェラ100%などグラム陰性菌では特に高い消失率を示した.また投与後菌出現率は20%と比較的低率でその多くはYLOであった.4)自他覚的副作用発現頻度は2.4%, 臨床検査値異常化は7.4%にみられたがこれらはいずれも軽度かつ一過性であったCefmenoxime (2 g) and cefsulodin (1 g) were given twice daily for 5 days by concomitant intravenous drip infusion (mixed infusion) to 135 patients with complicated urinary tract infection (c-UTI) probably caused by Pseudomonas aeruginosa. The clinical efficacy was evaluated according to the criteria proposed by the UTI committee in Japan. Ninety one subjects met the criteria for c-UTI and were evaluable for drug efficacy. P. aeruginosa was detected in 44 cases (including mixed infection with other organisms). The overall efficacy rate was 73% of the 91 cases; 75% of the 44 cases with P. aeruginosa and 70% in the 47 cases without P. aeruginosa infection. As to bacteriological response, the eradication rate was 91% (105/116) for all cases. By organism, the eradication rate for P. aeruginosa, Serratia spp. and Citrobacter spp. were 82 (36/44), 100 (12/12) and 100% (10/10), respectively. The eradication rate for gram-negative rods was 93% (99/107). Twenty-three strains appeared after treatment, and the majority of them (13) were yeast-like organisms. There was only one strain of P. aeruginosa. As for side effects, eruption was found in 2 cases. Cefmenoxime and cefsulodin were administered concomitantly to patients with c-UTI which was suspected to be caused by P. aeruginosa. The high overall efficacy rate of about 70% on the average was obtained regardless of the causative organism and disease state. The eradication rate of as high as about 90% was obtained excluding Enterococcus faecalis. Neither severe side effects nor abnormal laboratory values were found. It appeared, therefore, that this dosage regimen was useful for the treatment of refractory complicated urinary tract infection