Two blind multiuser detection algorithms for antenna array in Code Division Multiple Access (CDMA) system which apply the linearly constrained condition to the Least Squares Constant Modulus Algorithm (LSCMA) are prop...Two blind multiuser detection algorithms for antenna array in Code Division Multiple Access (CDMA) system which apply the linearly constrained condition to the Least Squares Constant Modulus Algorithm (LSCMA) are proposed in this paper. One is the Linearly Constrained LSCMA (LC-LSCMA), the other is the Preprocessing LC-LSCMA (PLC-LSCMA). The two algorithms are compared with the conventional LSCMA. The results show that the two algorithms proposed in this paper are superior to the conventional LSCMA and the best one is PLC-LSCMA.展开更多
We have developed a cost-effective and highly compact 100-Gb/s coarse wavelength division multiplexing(CWDM) transmitter optical subassembly(TOSA) using lens-free hybrid integration. To achieve large alignment toleran...We have developed a cost-effective and highly compact 100-Gb/s coarse wavelength division multiplexing(CWDM) transmitter optical subassembly(TOSA) using lens-free hybrid integration. To achieve large alignment tolerances, distributed feedback laser diodes(DFB-LDs) are butt-coupled to a four-channel silica-based planar lightwave circuit(PLC) arrayed waveguide grating, with the silicon sub-mounts and PLC adhesively bonded.Then, a flexible printed circuit is employed to connect the internal DFB-LDs and the exterior of the TOSA package for radiofrequency signal transmission, eliminating the expensive ceramic feed-through. The packaged CWDM TOSA, which is 15.8 mm × 7.0 mm × 6.0 mm in size, shows a side-mode suppression ratio of>40 dB, a 3 dB bandwidth of >18 GHz, and error-free transmission with an average optical output power of >0 dBm and dynamic extinction ratio of >4.0 dB at 25.78125 Gb/s over a 10 km single-mode fiber for all four lanes.展开更多
基金Supported by the National Natural Science Foundation of China (No.60472104)Doctoral innovative fund of Jiangsu province (xm04-32).
文摘Two blind multiuser detection algorithms for antenna array in Code Division Multiple Access (CDMA) system which apply the linearly constrained condition to the Least Squares Constant Modulus Algorithm (LSCMA) are proposed in this paper. One is the Linearly Constrained LSCMA (LC-LSCMA), the other is the Preprocessing LC-LSCMA (PLC-LSCMA). The two algorithms are compared with the conventional LSCMA. The results show that the two algorithms proposed in this paper are superior to the conventional LSCMA and the best one is PLC-LSCMA.
基金National High Technology Research and Development Program of China(2015AA016904)National Natural Science Foundation of China(NSFC)(61335002,61675084,61775094)Major State Basic Research Development Program of China(2013CB632104,2013CB933303)
文摘We have developed a cost-effective and highly compact 100-Gb/s coarse wavelength division multiplexing(CWDM) transmitter optical subassembly(TOSA) using lens-free hybrid integration. To achieve large alignment tolerances, distributed feedback laser diodes(DFB-LDs) are butt-coupled to a four-channel silica-based planar lightwave circuit(PLC) arrayed waveguide grating, with the silicon sub-mounts and PLC adhesively bonded.Then, a flexible printed circuit is employed to connect the internal DFB-LDs and the exterior of the TOSA package for radiofrequency signal transmission, eliminating the expensive ceramic feed-through. The packaged CWDM TOSA, which is 15.8 mm × 7.0 mm × 6.0 mm in size, shows a side-mode suppression ratio of>40 dB, a 3 dB bandwidth of >18 GHz, and error-free transmission with an average optical output power of >0 dBm and dynamic extinction ratio of >4.0 dB at 25.78125 Gb/s over a 10 km single-mode fiber for all four lanes.
