A flexible OFDM download communication system and its communication method
An orthogonal frequency division multiple access and orthogonal frequency division technology, applied in the direction of multi-frequency code system, sustainable building, climate sustainability, etc., can solve the problems of implementation complexity and cost control, and reduce the implementation Effects of Complexity and Power Consumption
Active Publication Date: 2008-09-17
SHANGHAI RES CENT FOR WIRELESS TECH
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Problems solved by technology
At this time, if the existing system transmission scheme is adopted, for a terminal that only supports low-rate services, in order to demodulate OFDM symbols carrying low-rate services, it must also support and perform FFT transformation with a large number of points, so its implementation is complicated. Speed and cost are difficult to control
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[0013] see figure 1 , the smart OFDMA downlink communication system of the present invention at least includes: a transmitting end and a plurality of receiving ends, for simplified illustration, figure 1 Only two receiving ends are shown in the figure, that is, the first receiving end and the second receiving end, but this illustration is not limited thereto.
[0014] The transmitting end is used to perform various processes on the communication information to be sent to each user to obtain a broadband analog OFDM baseband signal, and to perform various processing on the broadband analog OFDM baseband signal according to a preset carrier frequency performing frequency conversion to obtain a radio frequency signal, and transmitting the radio frequency signal and the subcarrier allocation information of the information to be sent to each user in the broadband analog OFDM baseband signal, wherein the The processing of the information transmitted to each user includes subcarrier ...
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An OFDMA (orthogonal frequency division multiple access) downlink communication system and a communication method, which makes communication information to be sent to each user at a transmitting terminal undergo IFFT transform with larger points and analog conversion (d / a conversion) to obtain a wide band analog OFDM signal, and makes RF signals to be received at a plurality of receiving terminal undergo each treatment so that each receiving terminal obtains a corresponding user narrow band discrete signal respectively, and makes the user narrow band discrete signal undergo each treatment including d / a conversion, spectrum removal and filtering to obtain a discrete narrow band base-band signal respectively, and obtains corresponding communication message by FFT transform with less points, so that radio resource of the wide band communication system is flexibly adaptable to various service requirement and terminal processing ability of multi-user, so as to reduce accomplishment complexity of mobile terminal and power consumption.
Description
technical field [0001] The invention relates to a smart OFDM downlink communication system and communication method. Background technique [0002] In wireless communication systems, especially in broadband mobile communication systems, air signal transmission technology is becoming the focus of research. In order for the broadband mobile communication system to obtain higher spectral efficiency, such as up to 10bps / Hz, to support the communication needs of various scenarios and support various adaptive control technologies, its signal transmission technology must be better than any previous Better performance of similar techniques while maintaining manageable implementation complexity. [0003] The current broadband mobile communication signal transmission technology is mainly single carrier multiple access technology represented by Code Division Multiple Access (CDMA) and multi-carrier multiple access technology represented by Orthogonal Frequency Division Multiplexing (OF...
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Login to View More IPC IPC(8): H04L27/26
CPCY02B60/50
Inventor 李明齐张小冬芮赟
Owner SHANGHAI RES CENT FOR WIRELESS TECH