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Adaptive power control based on a rake receiver configuration in wideband CDMA cellular systems (WCDMA) and methods of operation

A WCDMA system includes a Base Station (BS) or forward transmitter and a pilot channel that transmits control signals between a Mobile Station (MS) and BS to reconfigure their transmitter/receiver according to the prediction of the channel power and channel power probability density function separated into three distinct equal probable regions. Data signals are encoded using a one-half Viterbi encoder and interleaved. The interleaved data bits are modulated using Quadrature Phase Shift Keying (QPSK) modulation. The QPSK data is multiplexed with the pilot channel and spread by an appropriate code in an OFDM transmitter modified by a long code. Output of the transmitter may be provided to two diverse antennas for reliable communications to the receiver. Data may be received at two diverse antennas. The outputs are provided to match filters coupled to a coherent rake receiver and a channel prediction system. The future attenuation of the channel coefficients and power are determined by the prediction system for several milliseconds. The power levels of each finger in the Rake receiver can be predicted and the strongest ones used in determining the optimum transmitter power or rate control for operating the system transmitters and receivers based on computing a long range power prediction of each finger of a rake receiver.
Owner:WISTRON CORP

Train broadband communication network architecture suitable for railway vehicle

The invention relates to a train broadband communication network architecture suitable for a railway vehicle. Specifically, the network architecture is a broadband communication network architecture provided according to train control and an information service network. The train broadband communication network architecture mainly comprises two-level bus architectures which are a train-level network bus and a vehicle-level network bus. According to a train-level network, a broadband network bus is adopted, penetrates through carriages of a whole train, is in linear connection with train-level network elements, and is used for achieving communication between the train-level network elements. According to a vehicle-level network, a broadband network bus is adopted and used for achieving communication between the train-level network elements and vehicle-level network elements, communication between the vehicle-level network elements, and communication between the vehicle-level network elements in the vehicle and vehicle-level equipment provided with broadband network bus interfaces. The train broadband communication network architecture further comprises an equipment-level network bus. According to the equipment-level network bus, other network buses except for the broadband network buses are adopted. Protocol conversion is achieved through gateways connected with the vehicle-level network elements, and communication with the vehicle-level network is achieved.
Owner:CRRC QINGDAO SIFANG ROLLING STOCK RES INST
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