Abstract: A time division multiplexing synchronization apparatus, radio communication apparatus, and synchronization method in time division multiplex communication that enable power savings to be achieved and synchronization to be performed dependably with a signal from the intended station. From the start of communication until a slot containing frame information can be confirmed, data reception is performed only for a fixed time each time the UW of a slot is detected, and data reception is not performed in other periods. By this means power consumption can be reduced, and since unwanted synchronization is not performed for a disturbing wave of another station or the like, synchronization can be maintained dependably.

Abstract: A radio communication apparatus that enables synchronization to be maintained reliably on a receiving side. In this apparatus, a UW detector (106) detects a UW included in a time division multiplexed mobile station received signal. A timing discrimination section (107) finds a timing difference between the UW detection timing and preset reference reception timing, and creates delay information from the found timing difference. A slot counter (109) overflows every slot and outputs an overflow signal reporting the next slot. Before a mobile station starts communication, a mobile station timing register (110) outputs at predetermined timing initial delay information obtained from a higher-level station, and after a mobile station starts communication, outputs at predetermined timing delay information input from the timing discrimination section (107).

Abstract: Based on the results of the detection of a unique word in a received signal with a unique word detecting portion and the detection of a correct CRC in a received signal with a CRC calculating portion, a microprocessor portion sends a reset signal to a timer portion. The reset signal resets the timer of the timer portion, and causes the timer portion to send a field strength measurement timing signal to a field strength measuring portion. The timer portion then automatically keeps track of the data slot timing and outputs the field strength measurement timing signal at every cycle of desired time-slot. Thus, the reliability of measuring the field strength of received radio wave for the desired station in a time-division multiple access can be improved, even if there is interference from other stations.

Abstract: The position detecting apparatus of the present invention comprises position detecting means for receiving radio waves for position detection and outputting position information and DSRC means for receiving radio waves for DSRC and processing signals, characterized in that the position detecting means and the DSRC means are controlled via the same CPU and share part or whole of storage means and that the position detecting means is adapted to operate in either the full drive mode or suppress mode.

Abstract: The present invention reduces power consumption and costs for components, and improves acknowledgement speed by using a memory or the like used only for acknowledgement. A time-division multiple access radio communication device of the present invention includes a receive-data buffer portion for storing received data; a unique word detecting portion for detecting a unique word from the received data; a timer portion for counting time from the point at which the unique word is detected at the unique word detecting portion; a cyclic redundancy check (CRC) calculating portion for checking errors in the received data; and a send-data buffer portion for storing data to be sent. The time-division multiple access radio communication device is further provided with an acknowledgement data generating portion.