Structure of an OFDM channel

Contexts in source publication

Context 1

... channel is separated from the others through a guard area in which no information is transmitted (subcarrier zero). Figure 1 (Structure of an OFDM channel) shows the structure (in frequency) of a transmission channel, which comprises the following: subcarriers which transmit the data, pilots which evaluate the transmission environment and guard area. ...

Context 2

... each 5th complex symbol, one pilot was introduced, thus obtaining an OFDM symbol of 150 points. An OFDM symbol consists of 125 complex symbols that transmit the information of 250 bits. Each of the 125 complex symbols can have any state of the 4 of the QPSK constellation. Because the amplitude is constant, only the phase shift in radians is shown (Fig. ...

Context 3

... the 125-point OFDM symbol, without pilots, the OFDM symbol of 150 points, with pilots and a detail of these 2 sequences can be seen to see the first three pilots introduced (Fig.11).. Below is the section of the transmitter module responsible for the introduction of the guard in zeros frequencies. Graphic representation reveals the OFDM symbol of 256 points that includes the useful data pilots and zeros (Fig. 12) Fig. 12 Insertion of 106 zeros ...

Context 4

... of 150 points, with pilots and a detail of these 2 sequences can be seen to see the first three pilots introduced (Fig.11).. Below is the section of the transmitter module responsible for the introduction of the guard in zeros frequencies. Graphic representation reveals the OFDM symbol of 256 points that includes the useful data pilots and zeros (Fig. 12) Fig. 12 Insertion of 106 ...

Context 5

... with pilots and a detail of these 2 sequences can be seen to see the first three pilots introduced (Fig.11).. Below is the section of the transmitter module responsible for the introduction of the guard in zeros frequencies. Graphic representation reveals the OFDM symbol of 256 points that includes the useful data pilots and zeros (Fig. 12) Fig. 12 Insertion of 106 ...

Context 6

... Thus, the 256 points in the time domain are converted to the type domain at all 256 points. The points being complete can be tracked as two individual signals I and Q. Below is the section of the Frequency-Time Conversion Module (IFFT) section. The graphical representation reveals the two signals in time domain I and Q, each of 256 points (Fig. 13). (Fig. 14). Introduction of signal disturbance functions (Fig. 15) Fig. 15 Introduction of signal disturbance ...

Context 7

... the 256 points in the time domain are converted to the type domain at all 256 points. The points being complete can be tracked as two individual signals I and Q. Below is the section of the Frequency-Time Conversion Module (IFFT) section. The graphical representation reveals the two signals in time domain I and Q, each of 256 points (Fig. 13). (Fig. 14). Introduction of signal disturbance functions (Fig. 15) Fig. 15 Introduction of signal disturbance ...

Context 8

... 14). Introduction of signal disturbance functions (Fig. 15) Fig. 15 Introduction of signal disturbance functions ...

Context 9

... at all 256 points. The points being complete can be tracked as two individual signals I and Q. Below is the section of the Frequency-Time Conversion Module (IFFT) section. The graphical representation reveals the two signals in time domain I and Q, each of 256 points (Fig. 13). (Fig. 14). Introduction of signal disturbance functions (Fig. 15) Fig. 15 Introduction of signal disturbance ...

Context 10

... module (fig. 16) Fig. 16 The receviver ...

Context 11

... module (fig. 16) Fig. 16 The receviver ...