Patent ID: 7864739

Claim:
A transmitter for multi-carrier transmission configured to transmit a plurality of sub-carriers having at least one pilot symbol duration comprising: a pilot symbol allocater configured to allocate a first pilot symbol pattern to a first portion and allocate a second pilot symbol pattern to a second portion, the first symbol pattern and the second symbol pattern each constituting a plurality of pilot symbols consecutive in a direction of a time-base and being orthogonal to one another, wherein the first portion and the second portion each include at least two pilot symbol durations in at least two consecutive sub-carriers and only include the plurality of pilot symbols constituting a single pilot symbol pattern, the second portion includes at least two pilot symbol durations in a sub-carrier included in the first portion and a sub-carrier not included in the first portion, the first portion and the second portion share at least one sub-carrier and at least one pilot symbol duration, and the pilot symbol allocater changes the length of at least one of the first and second pilot symbol patterns based on the number of the pilot symbol patterns which are allocated.