Patent ID: 9722847
Date: 2017-08-01
CPC Classifications: H04L,H04W

Claim:
1. A transmitter comprising: preamble generation circuitry which, in operation, generates first and second synchronization preambles having different numbers of subcarriers, and adds a predetermined dummy period between the first synchronization preamble and the second synchronization preamble; transmission signal generation circuitry which, in operation, generates an Orthogonal Frequency Division Multiplexing (OFDM) transmission signal by using the generated first and second synchronization preambles; and transmission circuitry which, in operation, converts the generated OFDM transmission signal into a radio-frequency OFDM signal and transmits the radio-frequency OFDM signal, wherein the preamble generating circuitry, in operation, allocates M number of symbols of the first synchronization preamble and N number of symbols of the second synchronization preamble in the predetermined dummy period, where M is an integer of 1 or more and where N is an integer of 1 or more.