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Data communication apparatus and method based on orthogonal FDMA

An orthogonal frequency division multiple access and data communication technology, applied in the field of data communication, can solve problems such as terminal hardware and design complexity

Inactive Publication Date: 2002-10-30
SAMSUNG ELECTRONICS CO LTD
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Problems solved by technology

However, conventional data communication based on OFDMA complicates the hardware and design of the terminal

Method used

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  • Data communication apparatus and method based on orthogonal FDMA
  • Data communication apparatus and method based on orthogonal FDMA
  • Data communication apparatus and method based on orthogonal FDMA

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Embodiment Construction

[0034] The configuration and operation of an Orthogonal Frequency Division Multiple Access (OFDMA) based data communication device according to the present invention will be described below with reference to the accompanying drawings.

[0035] figure 1 A schematic block diagram of an OFDMA-based data communication device according to the present invention is shown. The data communication device includes: a user part 10 with a user transmitting unit 12 and a user receiving unit 14;

[0036] As many user sections 10 communicate with the base station section 20 as there are users. All of the user sections 10 communicate with the base station section 20 in the following manner.

[0037] Please refer to figure 1 , according to the user transmission unit 12 of the data communication device of the present invention, the user information encoded in the form of user symbols is sent to the base station for reception in units of symbol blocks including at least one main symbol and at ...

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Abstract

The invention provides a data communication device and a data communication method based on Orthogonal Frequency Division Multiple Access (OFDMA). In the data communication device, the (U+1)th encoder in the uth user transmitting unit of the U user transmitting units used to send the corresponding user information to a base station part encodes the user information and outputs the encoded The result is taken as Nu u-th user symbols. According to the formula X(u)k=a(u)k%Nuexp(j2πknu / N), using the Uth user symbol Am(u) received from the (U+1)th coder, when a user signal generator generates The uth user signal xk(u) in the domain. The second cyclic extension symbol inserter inserts cyclic extension symbols into the uth user signal. The second signal transmitter converts the insertion result into a symbol block signal, and transmits the symbol block signal to the base station section. Here, 1≤NU≤N. Therefore, the hardware of the user part can be optionally greatly simplified. In a given channel environment, the communication efficiency can be improved. In addition, different types of user parts with different degrees of complexity can communicate with a base station part using one data format.

Description

technical field [0001] The present invention relates to data communication, and more particularly, the present invention relates to a data communication device and a data communication method based on Orthogonal Frequency Division Multiple Access (OFDMA). Background technique [0002] In a conventional data communication process based on OFDMA, information is transmitted from a base station to a user section in units of data symbol blocks in the following manner. First, perform N-point Inverse Discrete Fourier Transform (IDFT) or N-point Inverse Fast Fourier Transform (IFFT) on the information to be sent (N represents the total number of symbols to be allocated to users). A block of symbols generated by appending a cyclic prefix before the main symbol sequence with transform information is transmitted. As a result, during conventional data communication based on OFDMA, the entire frequency band is divided into N small frequency bands (or subcarriers), and a single data symb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L5/02
CPCH04L5/023H04L27/26
Inventor 金暎秀
Owner SAMSUNG ELECTRONICS CO LTD
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