Patent ID: 8743981

Claim:
A modulation method, comprising: processing at least two data blocks to obtain at least two single-carrier Orthogonal Frequency Division Multiplex (OFDM) signals, wherein the at least two data blocks comprise a first data block and a second data block, and the at least two single-carrier OFDM signals comprise a first single-carrier OFDM signal corresponding to the first data block and a second single-carrier OFDM signal corresponding to the second data block, wherein the first single-carrier OFDM signal and the second single-carrier OFDM signal comprise subcarriers having a subcarrier bandwidth F 0 , and wherein a difference between a first carrier center frequency RF 1 of the first single-carrier OFDM signal and a second carrier center frequency RF 2 of the second single-carrier OFDM signal is an integral multiple of the subcarrier bandwidth F 0 ; and transmitting the at least two single-carrier OFDM signals, wherein processing the at least two data blocks to obtain the at least two single-carrier OFDM signals comprises performing an inverse discrete Fourier transformation on the at least two data blocks respectively, to generate at least two channels of digital single-carrier OFDM signals, the at least two channels of digital single-carrier OFDM signals comprising at least a first channel of digital single-carrier OFDM signal(s) corresponding to the first data block and a second channel of digital single-carrier OFDM signal(s) corresponding to the second data block, wherein a first transition band W 1 is used to perform digital spectrum shaping filtering on the first channel of digital single-carrier OFDM signal(s), wherein a second transition band W 2 is used to perform digital spectrum shaping filtering on the second channel of digital single-carrier OFDM signal(s), and wherein at least one of the second transition band W 2 and the first transition band W 1 exceeds a guard bandwidth between the first channel of digital single-carrier OFDM signal(s) and the second channel of digital single-carrier OFDM signal(s).