摘要:
The packet reception section of the cellular phone receives a packet transmitted from the base station and the transmission error detection section detects a transmission error of the received packet. When the transmission error is detected, the retransmission request transmission section transmits a retransmission request to request the retransmission of the packet in which the transmission error is detected, to the base station, and the sample timing control section shifts the sample timing of the A/D converter by a half clock.
摘要:
Improve efficiency of sampling of an A/D converter while suppressing power consumption. A packet receiving section receives six packets included in one frame transmitted from a base station, a sample timing control section shifts sample timing of the A/D converter by a half clock between former three packets and latter three packets out of six packets included in one frame.
摘要:
Improve efficiency of sampling of an A/D converter while suppressing power consumption. A packet receiving section receives six packets included in one frame transmitted from a base station, a sample timing control section shifts sample timing of the A/D converter by a half clock between former three packets and latter three packets out of six packets included in one frame.
摘要:
An increase in the power consumption and deterioration of the reception characteristic which can arise as a result of installing a multi-path interference removing apparatus are suppressed. The multi-path interference removing apparatus is operated only in the following cases: a case where a mobile communication terminal is in a communication active state, a case where communication takes place via a base station to which the adaptive modulation and coding technology is applied, a case where the number of reception paths of the mobile communication terminal is two or more paths, a case where the speed of motion of the mobile communication terminal is 60 km/h or less, and a case where the Signal to Interference power Ratio is 8 dB or more.
摘要:
Properties of a mobile communication terminal car be improved by eliminating interference according to environments of various reception paths. The mobile communication terminal generates a delay profile by a common pilot chapel sent from a base station and measures received electric power and delay amount of the reception path. Next, based on the delay profile, the delay amount of a reception path P4 farthest from a reference path P1 is set as a maximum delay amount D. However the farthest reception path P4 is excluded from the subjects of interference elimination when the electric power of which differs by a amount not less than 10 dB with respect to the electric power of the reference path P1, and the delay amount of a reception path P3 next farthest from the reference path P1 is set as the maximum delay amount D. After that, a chapel matrix s generated based on the number of samples and the maximum delay amount D. Then interference is eliminated by multiplying a channel actually carrying data information by a weighting matrix generated based on the channel matrix.
摘要:
The packet reception section of the cellular phone receives a packet transmitted from the base station and the transmission error detection section detects a transmission error of the received packet. When the transmission error is detected, the retransmission request transmission section transmits a retransmission request to request the retransmission of the packet in which the transmission error is detected, to the base station, and the sample timing control section shifts the sample timing of the A/D converter by a half clock.
摘要:
There is disclosed a mobile communication terminal equipped with a multipath interference canceller for canceling multipath interference, comprising number-of-samples controlling unit for controlling a number of samples to be sampled from a received signal, channel matrix generating unit for generating a channel matrix on the basis of sample data of samples as many as the number controlled by the number-of-samples controlling means and, interference canceling emit for canceling multipath interference on the basis of the channel matrix generated by the channel matrix generating unit.
摘要:
There is disclosed a mobile communication terminal equipped with a multipath interference canceller for canceling multipath interference, comprising number-of-samples controlling unit for controlling a number of samples to be sampled from a received signal, channel matrix generating unit for generating a channel matrix on the basis of sample data of samples as many as the number controlled by the number-of-samples controlling means and, interference canceling emit for canceling multipath interference on the basis of the channel matrix generated by the channel matrix generating unit.
摘要:
When the diversity reception is cut, communications with the base station are continued. When it is judged by the judgment section of the mobile communication terminal that a predetermined disconnection requirement for disconnecting diversity reception is satisfied, the gain control section of the digital baseband circuitry 20 reduces the gain of the AGC14B contained in the RF receiver circuitry 10B constituting the disconnection target by a fixed value at fixed times. Diversity reception is cut after the level of the signal output by the AGC14B has reached zero.
摘要:
Signals are received with a wider power range even through the use of existing AGCs than by conventional mobile communication terminals. In an AGC on one antenna side, in order to enable reception of a signal at a higher level, a target TA of a dynamic range DA of this AGC is changed to a value 5 dB higher than a value defined as a standard TS. On the other hand, in an AGC on another antenna side, in order to enable reception of a signal at a lower level, a target TB of a dynamic range DB of this AGC is changed to a value 5 dB lower than the value defined as the standard TS.