System and method for ask ofdm transmission and reception

H - Electricity – 04 – L

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H04L 27/26 (2006.01) H04B 7/208 (2006.01) H04J 11/00 (2006.01) H04L 27/02 (2006.01) H04L 27/04 (2006.01) H04L 27/06 (2006.01)

Patent

CA 2578464

An OFDM system and method using amplitude shift keying (ASK) for subcarrier modulation is provided. Because ASK is used, the signal of each symbol in time domain is conjugate--symmetric. In addition, among the discrete numbers of each symbol, two of them are always real. These properties are utilized such that only half of the numbers of each symbol sequence are transmitted. The generated baseband signal can be a complex or a real signal. As a result, the bandwidth efficiency of the derived ASK-OFDM is the same as that of QAM-OFDM.

La présente porte sur un système et une méthode de multiplexage par répartition orthogonale de la fréquence (MROF) utilisant la manipulation par changement d'amplitude (ASK) pour une modulation ide sous-porteuse. Parce que l'ASK est utilisée, le signal de chaque symbole en domaine temporel est conjugué-symétrique. De plus, parmi les nombres discrets de chaque symbole, deux d'entre eux sont toujours réels. Ces propriétés sont utilisées de façon que seulement la moitié des nombres de chaque séquence de symbole est transmise. Le signal dans la bande de base généré peut être un signal complexe ou réel. En conséquence, l'efficacité de la largeur de bande de l'ASK-OFDM dérivée est la même que celle de la QAM-OFDM.

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