CDMA radio communication system using chip interleaving
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsKeiichi Kitagawa, Mitsuru Uesugi
Life of this patent
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Abstract
In a CDMA transmission, a quality of each symbol of a frame is held constant by interleaving spread chip, while overhead and interference amounts in other cells are reduced by easing a rate of transmission power control. Further, transmission power is decreased by discontinuing transmission at the time the quality is satisfied, thereby increasing the system capacity. Furthermore, it is possible to achieve more remarkable effect by performing inverse transmission power control.
Claims15
A CDMA radio reception apparatus comprising:
- a reception section that receives data subjected to spreading by a predetermined spreading factor and subjected to chip interleaving processing;
- a chip deinterleaving section that performs chip deinterleaving processing on the received data for every chip;
- a synchronization detector that measures an arrival time of the received data;
- and
- a transmission power controller that performs a control, on a CDMA radio transmission apparatus from which the arrival time is too late to complete a reception of the received data in a predetermined time, to limit a transmission time length while increasing transmission power so that the reception is completed in the predetermined time and total transmission power is held constant.
A CDMA radio transmission apparatus that transmits data to a CDMA radio reception apparatus comprising a chip deinterleaving section that performs chip deinterleaving processing on received data for every chip, a synchronization detection section that measures an arrival time of the received data, and a transmission power controller that, with respect to a CDMA radio transmission apparatus from which the arrival time is too late to complete a reception of the received data in a predetermined time, performs a control to limit a transmission time length while increasing transmission power so that the reception is completed in the predetermined time and total transmission power is held constant, said CDMA radio transmission apparatus comprising:
- a spreading section that spreads data by a predetermined spreading factor;
- a chip interleaving system that performs chip interleaving processing on spread data for every chip;
- and
- a transmission power setting section that sets a transmission power of chip interleaved data into a transmission power controlled by said CDMA radio reception apparatus.
A CDMA radio transmission apparatus that transmits data to a CDMA radio reception apparatus comprising a chip deinterleaving section that performs chip deinterleaving processing on received data for every chip, a synchronization detection section that measures an arrival time of the received data, and a time control system that provides a delay in a transmission starting time of data at said CDMA radio transmission apparatus, the CDMA radio transmission apparatus comprising:
- a spreading section that spreads data by a predetermined spreading factor;
- a chip interleaving section that performs chip interleaving processing on spread data for every chip;
- and
- a time setting section that sets the transmission starting time of chip interleaved data according to the delay of the transmission starting time controlled by said CDMA radio reception apparatus.
A CDMA radio communication method comprising:
- receiving data subjected to spreading by a predetermined spreading factor and subjected to chip interleaving processing;
- performing chip deinterleaving processing on the received data for every chip;
- measuring an arrival time of the received data;
- and
- controlling, on a CDMA radio transmission apparatus from which the arrival time is too late to complete a reception of the received data in a predetermined time, to limit a transmission time length while increasing transmission power so that the reception is completed in the predetermined time and total transmission power is held constant.
A CDMA radio communication system comprising:
- a transmission apparatus comprising a spreading section that spreads transmission data by a predetermined spreading factor, a chip interleaving section that performs chip interleaving processing on spread transmission data, and a transmitting section that transmits the transmission data;
- and
- a reception apparatus comprising a receiving section that receives transmission data subjected to chip interleaving processing, and a chip deinterleaving section that performs chip deinterleaving processing on the received data for every chip, a synchronization detection section that measures an arrival time of the received data, and a transmission power control section that performs a control, on the transmission apparatus from which the arrival time is too late to complete a reception of the received data in a predetermined time, to limit a transmission time length while increasing transmission power so that the reception is completed in the predetermined time and total transmission power is held constant.
Dependencies are inferred from the claim text.