Receiving apparatus and method of detecting top path in delay profile

A base station apparatus comprising a receiving apparatus, said receiving apparatus comprising:

• a correlation operator that performs a correlation operation with a midamble included in a received signal and a midamble sequence formed by cyclically shifting a basic midamble code by a predetermined amount;
• a delay profile creator that creates a delay profile based on a result of the correlation operation;
• a path determiner that determines whether or not a new path before a top path of a specific channel in the delay profile is a path of said specific channel;
• a frame position controller that, when the path determiner determines the new path to be a path of the specific channel, sets the top path anew with said new path;
• and
• a demodulator that, when the frame position controller sets the new path as a new top path, demodulates the received signal in accordance with the new path.

A communication terminal apparatus comprising a receiving apparatus, said receiving apparatus comprising:

• a correlation operator that performs a correlation operation with a midamble included in a received signal and a midamble sequence formed by cyclically shifting a basic midamble code by a predetermined amount;
• a delay profile creator that creates a delay profile based on a result of the correlation operation;
• a path determiner that determines whether or not a new path before a top path of a specific channel in the delay profile is a path of said specific channel;
• a frame position controller that, when the path determiner determines the new path to be a path of the specific channel, sets the top path anew with said new path;
• and
• a demodulator that, when the frame position controller sets the new path as a new top path, demodulates the received signal in accordance with the new path.

A method of detecting a top path, comprising the steps of:

• performing a correlation operation with a midamble included in a received signal and a midamble sequence formed by cyclically shifting a basic midamble code by a predetermined amount;
• creating a delay profile based on a result of the correlation operation;
• determining whether or not a new path before a top path of a specific channel in the delay profile is a path of said specific channel;
• and
• setting the top path anew with the new path when said new path is determined to be a path of the specific channel.