Pulse or digital communications – Transmitters
Reexamination Certificate
2006-07-04
2006-07-04
Bocure, Tesfaldet (Department: 2631)
Pulse or digital communications
Transmitters
C370S210000
Reexamination Certificate
active
07072419
ABSTRACT:
A data communication apparatus and method based on orthogonal frequency division multiple access (OFDMA) are provided. In the data communication apparatus, a (U+1)-th encoder in a u-th user transmitting unit among U user transmitting units which transmit corresponding user information to a base station part encodes the user information and outputting the result of encoding as Nuu-th user symbols. A user signal generator generates a u-th user signal xk(u)in a temporal domain from the u-th user symbol Am(u)received from the (U+1)-th encoder according to a formula, xk(u)=ak % Nu(u)exp(j2πknu/N). A second cyclic extension symbol inserter inserts a cyclic extension symbol into the u-th user signal. A second signal transmitter converts the result of insertion into a symbol block signal and transmitting the symbol block signal to the base station part. Here, 1≦NU<N. Accordingly, the hardware of a user part can be optionally simplified very much. Communication efficiency can be increased in a given channel environment. In addition, different types of user parties having different complexities can communicate with a base station part using a single data format.
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Bocure Tesfaldet
Buchanan & Ingersoll PC
Samsung Electronics Co,. Ltd.
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