Abstract:
A mobile communication apparatus with multiple transmission and reception antennas and a mobile communication method therefore are provided. In the mobile communication apparatus including a base station and a mobile station, the base station with at least one transmission antenna restores long-term information and short-term information from a received feedback signal, spatially processes dedicated physical channel (DPCH) signals using basis information generated from the restored long-term information and short-term information, and transmits the results of adding pilot channel (PICH) signals to the spatially processed results, to the base station. The base station with at least one reception antenna determines a first characteristic corresponding to the channel downlink characteristic for each of the transmission and reception antennas using the PICH signals transmitted from the base station, determines the long-term information and short-term information based on the first characteristic, converts the determined long-term information and short-term information to a feedback signal, and transmits the feedback signal to the base station. The long-term information includes effective long-term eigenvectors and effective long-term eigenvalues, and the short-term information includes effective short-term eigenvectors and effective short-term eigenvalues. Therefore, the effects of interference and noise may be reduced, and transmission data throughput may be increased, thereby minimizing fading effects.
Abstract:
A mobile communication apparatus with multiple transmission and reception antennas and a mobile communication method therefore are provided. In the mobile communication apparatus including a base station and a mobile station, the base station with at least one transmission antenna restores long-term information and short-term information from a received feedback signal, spatially processes dedicated physical channel (DPCH) signals using basis information generated from the restored long-term information and short-term information, and transmits the results of adding pilot channel (PICH) signals to the spatially processed results, to the base station. The base station with at least one reception antenna determines a first characteristic corresponding to the channel downlink characteristic for each of the transmission and reception antennas using the PICH signals transmitted from the base station, determines the long-term information and short-term information based on the first characteristic, converts the determined long-term information and short-term information to a feedback signal, and transmits the feedback signal to the base station. The long-term information includes effective long-term eigenvectors and effective long-term eigenvalues, and the short-term information includes effective short-term eigenvectors and effective short-term eigenvalues. Therefore, the effects of interference and noise may be reduced, and transmission data throughput may be increased, thereby minimizing fading effects.
Abstract:
The wireless system at a base station for receiving uplink signals transmitted from a number of remote terminals using a common conventional uplink channel has a receiver system with a number of antenna elements and receivers for producing measurements of combinations of the uplink signals. A receive spatial processing device determines and stores receive spatial signatures for the remote terminals using the measurements. A spatial demultiplexer uses the receive spatial signatures and the measurement to produce separated uplink signals. The uplink signals from the remote terminals can be received independently while simultaneously communicating on the common uplink channel.
Abstract:
A wireless system comprising a network of base stations (1) for receiving uplink signals transmitted from a plurality of remote terminals and for transmitting downlink signals to the remote terminals using a plurality of channels including a plurality of antenna elements (19) at each base station for receiving uplink signals, a plurality of antenna elements (18) at each base station for transmitting downlink signals, a signal processor (13) at each base station connected to the receiving antenna elements (19) and to the transmitting antenna elements (18) for determining spatio-temporal multiplexing and demultiplexing functions for each remote antenna for each channel, and a multiple base station network controller for optimizing network performance, whereby communication between the base stations and the remote terminals in each channel can occur simultaneously.
Abstract:
A radio receiver includes a first signal path including a first tuner configured to receive a first signal from a first antenna, and a first demodulator configured to demodulate symbols from an output of the first tuner to produce first branch metrics derived from the demodulated symbols; a second signal path including a second tuner configured to receive a second signal from a second antenna, and a second demodulator configured to demodulate symbols from an output of the second tuner to produce second branch metrics derived from the demodulated symbols; a combiner for maximum ratio combining the first branch metrics and the second branch metrics; and processing circuitry to process the combined first and second branch metrics to produce an output signal.