Generalized multiple carrier frequency division multiple access transmission equipment based on orthogonal transformation processing
A technology of orthogonal transformation and frequency division multiple access, applied in the field of broadband wireless communication system, can solve the problems of signal peak-to-average ratio cannot be reduced, improved, link performance loss, etc., to improve power amplifier efficiency, improve spectral efficiency, reduce peak average effect
Active Publication Date: 2014-03-12
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI +1
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It can be seen that the cluster-based DFT spread spectrum OFDMA system does not support independent link adaptation technology, hybrid retransmission operation and multi-antenna enhancement technology on different frequency bands due to the use of physical layer data segmentation method , resulting in a loss of link performance and an increase in implementation complexity
Another disadvantage of this scheme is that the peak-to-average ratio of the signal after cyclic extension and frequency domain filtering can not be reduced, but will increase
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[0048] image 3 A realization block diagram of a transmitter of a generalized multi-carrier frequency division multiple access transmission system based on orthogonal transform processing according to a specific embodiment of the present invention is shown. It includes a channel coding and data block segmentation device 10, K constellation modulation devices 11 (for brevity, image 3 3, 110, 111 and 112), a K-point orthogonal transformation device 12, K serial-to-parallel conversion devices (for brevity, image 3 3 are shown in , 130, 131 and 132), K D-point discrete Fourier transform (DFT) devices (for brevity, image 3 3 are shown in , 140, 141 and 142), K period expansion devices (for brevity, image 3 3 are shown in , 150, 151 and 152), K spectrum shaping devices (for brevity, image 3 3, 160, 161 and 162), a subcarrier mapping device 17, an N (N>D×K) point inverse discrete Fourier transform (IDFT) device 18, a cyclic prefix adding device 19 and an orthogonal Change co...
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The invention discloses generalized multiple carrier frequency division multiple access transmission equipment based on orthogonal transformation processing. Compared with the current DFT spread spectrum orthogonal frequency division multiple access and N* single carrier frequency division multiple access transformation scheme based on a cluster, the transformation scheme of the invention not only can satisfy system coverage and cell-edge user performance, but also can improve user frequency spectrum efficiency in cells by changing the orthogonal transformation mode of a receiving terminal and a transmitting terminal. When the orthogonal transformation adopts discrete Fourier transform, the transmitting terminal can effectively lower signal transmitting peak-to-mean ratio, which is favorable for improving the power amplifier efficiency of the transmitting terminal so as to improve the system coverage and cell-edge user performance; when orthogonal transformation adopts identical transformation, the frequency spectrum efficiency in cells is improved respectively by independent link self-adaption, hybrid retransmission mechanism and multiple antenna enhancement technology via the system for multiple subbands occupied by single user.
Description
technical field [0001] The invention relates to the field of broadband wireless communication systems, in particular to a generalized multi-carrier frequency division multiple access transmission device based on orthogonal transform processing. Background technique [0002] In recent years, wireless communication systems have developed rapidly towards broadband; along with this development trend, wireless communication systems occupy higher and higher bandwidths, higher transmission rates, and higher spectral efficiency requirements. In the broadband wireless mobile communication system and the broadband wireless access network, multiple users are required to access at the same time, so multiple access technology is required. There are three main types of multiple access technologies commonly used: frequency division multiple access, time division multiple access, and code division multiple access. Frequency division multiple access technology is to allocate user informatio...
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IPC IPC(8): H04B7/26H04J11/00
CPCY02D30/70
Inventor 李明齐杨曾卜智勇
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI