The structure and performance of space-time multiuser detection receiver at base stations of WCDMA system is analyzed, in which smart antenna is employed. WCDMA uplink signal model is established in this paper. Space-...The structure and performance of space-time multiuser detection receiver at base stations of WCDMA system is analyzed, in which smart antenna is employed. WCDMA uplink signal model is established in this paper. Space-time multiuser receiver presented in this paper combines 2D-RAKE with parallel interference cancellation (PIC), and the improved parallel interference cancellation methods are given. A novel space-time multiuser detection scheme, 2DRAKE-GPPIC is proposed. This scheme employs smart antenna to suppress unexpected DOA (Direction Of Arrival) signal, uses RAKE receiver to combine different delays of expected signal, and utilizes grouped partial parallel interference cancellation (GPPIC) algorithm to suppress further the interference signal in the main lobe of array antennas. The simulation results reveal that the scheme of space-time multiuser detection presented in this paper has better performance for WCDMA system.展开更多
The dimensions of input waveguide and output waveguide of arrayed waveguide gratings(AWGs) determine the crosstalk,insertion loss and 1-dB bandwidth.In cascaded optical add/drop multiplexers(OADMs),the value of these ...The dimensions of input waveguide and output waveguide of arrayed waveguide gratings(AWGs) determine the crosstalk,insertion loss and 1-dB bandwidth.In cascaded optical add/drop multiplexers(OADMs),the value of these parameters will largely affect the power penalty of system.The power penalty of cascaded OADMs is calculated with different waveguide dimensions of AWGs in this paper.Considering of wavelength misalignment,and optimizaiton design of AWGs is obtained.展开更多
文摘The structure and performance of space-time multiuser detection receiver at base stations of WCDMA system is analyzed, in which smart antenna is employed. WCDMA uplink signal model is established in this paper. Space-time multiuser receiver presented in this paper combines 2D-RAKE with parallel interference cancellation (PIC), and the improved parallel interference cancellation methods are given. A novel space-time multiuser detection scheme, 2DRAKE-GPPIC is proposed. This scheme employs smart antenna to suppress unexpected DOA (Direction Of Arrival) signal, uses RAKE receiver to combine different delays of expected signal, and utilizes grouped partial parallel interference cancellation (GPPIC) algorithm to suppress further the interference signal in the main lobe of array antennas. The simulation results reveal that the scheme of space-time multiuser detection presented in this paper has better performance for WCDMA system.
文摘The dimensions of input waveguide and output waveguide of arrayed waveguide gratings(AWGs) determine the crosstalk,insertion loss and 1-dB bandwidth.In cascaded optical add/drop multiplexers(OADMs),the value of these parameters will largely affect the power penalty of system.The power penalty of cascaded OADMs is calculated with different waveguide dimensions of AWGs in this paper.Considering of wavelength misalignment,and optimizaiton design of AWGs is obtained.
