New sub-channel generating and allocating method of multi-user OFDMA system
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An allocation method and sub-channel technology, which are applied in orthogonal multiplexing systems, multi-frequency code systems, and multiplexing communications, etc., can solve the problem that sub-channel division does not fully comply with the design principles, and achieve good frequency diversity. effect, the effect of low power peak-to-average ratio
Inactive Publication Date: 2010-05-12
BEIJING SAMSUNG TELECOM R&D CENT +1
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[0013] In the current system, such as the high-performance metropolitan area network specification (Hiperman) and the 256OFDMA physical layer of 802.16e, the sub-channel division does not fully comply with the above design principles
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[0025] The OFDMA communication system is a communication system with OFDM technology as the core. OFDM is a high-speed transmission technology in a wireless environment. Most of the frequency response curves of wireless channels are non-flat. The main idea of OFDM technology is to divide a given frequency band into many orthogonal subcarriers in the frequency domain, modulate on each subcarrier, and transmit each subcarrier in parallel. In this way, although the overall wireless channel is non-flat and has frequency selectivity, each subcarrier is relatively flat, and the narrowband transmission is carried out on each subcarrier, and the signal bandwidth is smaller than the corresponding bandwidth of the wireless channel, so it can be greatly eliminated. Interference between signal waveforms. Since each sub-carrier is orthogonal to each other in the OFDM system, their spectrums overlap each other, which not only reduces the mutual interference between sub-carriers, but also...
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Abstract
The invention is a method of generating and allocating new subchannel in a multiuser orthogonal frequency division multiplex (OFDM) access system, including the steps: the system has 256 sub-carrier waves whose mark numbers are [-128 : 127]; the number of usable useful sub-carrier waves are 200, and their mark numbers are [-100 : -1, 1 : 100], where the sub-carrier waves -88, -63, -38, -13, 13, 38, 63, and 88 are used to transmit guide frequency signals; as all the useful sub-carrier waves are divided into two subchannels, the mark numbers of sub-carrier waves contained by one subchannel are [-100: -76, -50: -26, 1 : 25, 51 : 75], where the sub-carrier waves -38, -88, 13 and 88 are placed with guide frequency signals; and those of sub-carrier waves contained by the other subchannel are [-75: -51:, -25: -1, 26: 50, 76: 100], where the sub-carrier waves -13, 88, -63 and 38 are placed with guide frequency signals. The subchannels have the characters as follows: they have good frequency separately collecting effect; their guide frequency signals are uniformly allocated and dispersively distributed and it is extremely easy to obtain the access front guide of the subchannel with very-lowpower peak average and to apply to multiantenna system. It introduces a new subchannel access front guide, which has lower power peak average ratio.
Description
technical field [0001] The invention relates to the technical field of Orthogonal Frequency Division Multiple Access (OFDMA) communication, in particular, the invention relates to a method for generating and assigning new sub-channels in the physical layer of the OFDMA communication system. Background technique [0002] As a high-speed transmission technology of wireless communication system, Orthogonal Frequency Division Multiplexing (OFDM) technology was proposed as early as the 1960s. In recent years, due to the rapid development of digital signal processing technology and ASIC technology, the realization of OFDM system has become a reality, and OFDM technology has received attention and research again. OFDM has been recognized both at home and abroad as the next generation mobile wireless communication system technology. [0003] The OFDMA system is a multiple access communication system based on OFDM technology. In the OFDMA system, all available subcarriers are divide...
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