Preamble receiving apparatus

A preamble receiving apparatus, comprising:

• a receiving unit receiving from a transmitting apparatus a frame having a format which contains a preamble section and a margin section subsequent to the preamble section;
• and
• a reception processing unit detecting a preamble signal which is transmitted in the preamble section in the transmitting apparatus from the frame received by the receiving unit, the preamble signal being formed of a repetition of a single pattern or being added with a CP portion composed of a cyclic prefix or a cyclic postfix which is longer than the search section,
• wherein the reception processing unit includes:
• a correlation processing unit performing a correlating process operation with respect to a first section and a second section within the frame, the correlating process operation including calculating a correlation between the preamble signal and a known replica signal thereof, and creating power profiles related to the first section and the second section;
• and
• a synthesizing unit creating a synthesized power profile by synthesizing the power profiles related to the first section and the second section;
• the first section corresponds to a section having a position at which a timing is delayed by a length of the search section from an earliest reception timing of the preamble signal within the frame as a starting point, and another position at which the timing is delayed from the starting point by a length of the single pattern as an end point;
• the second section corresponds to a section having a starting point delayed from the starting point of the first section, and having the same length as that of the first section, and is also overlapped with the first section by the length of the search section, and
• wherein the preamble signal is a random access preamble signal transmitted from a mobile terminal to a base station when the mobile terminal performs a random access to the base station.

A preamble reception processing method for a preamble receiving apparatus including a receiving unit receiving from a transmitting apparatus a frame having a format which contains a preamble section and a margin section subsequent to the preamble section, and a reception processing unit detecting a preamble signal which is transmitted in the preamble section in the transmitting apparatus from the frame received by the receiving unit, the preamble reception processing method comprising:

• defining, by the reception processing unit, a time having a predetermined starting point and which is equal to or shorter than the margin section as a search section;
• performing, by the reception processing unit, a correlating process operation of the preamble signal related to a plurality of divided sections obtained by dividing the search section, the correlating process operation including calculating a correlation between the preamble signal and a known replica signal thereof, and creating a power profile for each of divided sections;
• creating, by the reception processing unit, a coupled power profile by coupling the power profile for each of the divided sections to each other;
• and detecting, by the reception processing unit, the preamble signal from the coupled power profile
• wherein the preamble signal is a random access preamble signal transmitted from a mobile terminal to a base station when the mobile terminal performs a random access to the base station.

A preamble reception processing method for a preamble receiving apparatus including a receiving unit receiving from a transmitting apparatus a frame having a format which contains a preamble section and a margin section subsequent to the preamble section, and a reception processing unit detecting a preamble signal which is transmitted in the preamble section in the transmitting apparatus from the frame received by the receiving unit, the preamble signal being formed of a repetition of a single pattern and being added with a CP portion composed of a cyclic prefix or a cyclic postfix which is longer than the search section, the preamble reception processing method comprising:

• creating, by the reception processing unit, power profiles related to a first section and a second section through a correlating process operation with respect to the first section and the second section within the received frame, the correlating process operation including calculating a correlation between the preamble signal and a known replica signal thereof;
• creating, by the reception processing unit, a synthesized power profile by synthesizing the power profiles with respect to the first section and the second section;
• and
• detecting, by the reception processing unit, the preamble signal from the synthesized power profile,
• wherein the first section corresponds to a section having a position at which a timing is delayed by a length of the search section from an earliest reception timing of the preamble signal within the frame as a starting point, and another position at which the timing is delayed from the starting point by a length of the single pattern as an end point, and
• wherein the second section corresponds to a section having a starting point delayed from the starting point of the first section and having the same length as that of the first section, and the second section is overlapped with the first section by the length of the search section, and
• wherein the preamble signal is a random access preamble signal transmitted from a mobile terminal to a base station when the mobile terminal performs a random access to the base station.