Patent ID: 8457100
Filing Date: 2013-06-04
Classification: H04B,H04J,H04L,H04W

Abstract:
1. A mobile wireless communication apparatus, wherein the mobile wireless communication apparatus serves as a mobile station in a wireless communication system for performing radio communication by a radio signal transmitted on a predetermined radio channel between a base station and the mobile station, or between mobile stations, the predetermined radio channel is either a control channel or a physical communication channel to be used between the base station and the mobile station, or a direct communication channel to be used between the mobile stations, in the predetermined radio channel, the control channel provided from the base station is used to transmit the radio signal for transmitting digital data which has a plurality of consecutive frames, a sync word formed by a predetermined code pattern is arranged at the front of each of the frames, and a post field including a pre-word formed by a code pattern different from that of the sync word is arranged at the end of each of the frames, in the predetermined radio channel, the physical communication channel provided from the base station is used to transmit the radio signal for transmitting digital data which has a plurality of consecutive frames, and the sync word formed by the predetermined code pattern is arranged at the front of each of the frames, in the predetermined radio channel, the direct communication channel is used to transmit the radio signal for transmitting digital data which has a plurality of consecutive frames, a preamble including a pre-word arranged at the front of a first frame at the start of transmission, and the sync word is arranged at the front of each subsequent frame, the mobile station comprises: a demodulating unit configured to receive the radio signal transmitted on the predetermined radio channel and demodulate a baseband signal, and a frame synchronizing unit configured to detect at least a predetermined sync word from a symbol sequence represented by the baseband signal demodulated by the demodulating unit and acquire frame synchronization, when the baseband signal is demodulated by the demodulating unit from the radio signal transmitted on the control channel, when a status of synchronization is either initial synchronization or re-synchronization, the frame synchronizing unit judges that the frame synchronization is successfully acquired when both the sync word and the pre-word are detected once, and, when the status of synchronization is synchronization maintenance, the frame synchronizing unit judges that the frame synchronization is successfully acquired when the sync word is detected once, when the baseband signal is demodulated by the demodulating unit from the radio signal transmitted on the physical communication channel, when the status of synchronization is either initial synchronization or synchronization maintenance, the frame synchronizing unit judges that the frame synchronization is successfully acquired when the sync word is detected once, and, when the status of synchronization is re-synchronization, the frame synchronizing unit judges that the frame synchronization is successfully acquired when the sync word is detected a plurality of times, and when the baseband signal is demodulated by the demodulating unit from the radio signal transmitted on the direct communication channel, when a status of synchronization is either initial synchronization or re-synchronization, the frame synchronizing unit judges that the frame synchronization is successfully acquired when the sync word is detected a plurality of times or when the sync word and the pre-word are detected once, and, when the status of synchronization is synchronization maintenance, the frame synchronizing unit judges that the frame synchronization is successfully acquired when the sync word is detected once.