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Method for offset-modulation orthogonal frequency division multiplexing transmission with cyclic prefix

一种循环前缀、传输方法的技术，应用在传输系统、数字传输系统、调制载波系统等方向，能够解决阻碍应用等问题

Active Publication Date: 2010-08-04
HUAWEI TECH CO LTD
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  • Method for offset-modulation orthogonal frequency division multiplexing transmission with cyclic prefix
  • Method for offset-modulation orthogonal frequency division multiplexing transmission with cyclic prefix
  • Method for offset-modulation orthogonal frequency division multiplexing transmission with cyclic prefix

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Embodiment Construction

[0082] The cyclic prefix OFDM transmission method of the offset quadrature amplitude modulation according to the embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0083] The OFDM transmission method with cyclic prefix provided by the embodiment of the present invention can be used as a complete processing method for transmitting and receiving baseband signals in a communication system through a wired or wireless channel. Let the real-valued baseband modulation symbol sequence after baseband mapping be d(m), divide it into K different streams, and divide the signal on each stream into length 2N d of blocks. Let the interval between symbols be T / 2, and the total bandwidth of the system be B, then N d / T≤B. Let the total number of subcarriers of OFDM be N c . So with the symbolic vector d k，l To represent the symbol vector of the lth block on the kth stream. like figure 1 As shown, it is a method for genera...

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Abstract

The invention relates to the offset-modulation orthogonal frequency division multiplexing and multicast communication with a cyclic prefix, which comprises a transmitted signal producing method at the transmitting end and a received signal processing method at the receiving end. The method comprises the following steps of: carrying out the generalized discrete Fourier transform on real value digital baseband modulation signs at the transmitting end to obtain frequency-domain signals; carrying out the conjugate symmetrical expansion, the frequency-domain filtering and the sub-carrier mapping on the frequency-domain signals; carrying out the inverse fast Fourier transform on the frequency-domain signals obtained after the sub-carrier mapping; inserting the cyclic prefix to obtain time-domain transmitted signals; removing the cyclic prefix at the receiving end; carrying out the fast Fourier transform on the signals with the cyclic prefix removed to obtain frequency-domain received signals; and carrying out the iterative detection decoding based on the multi-user combined frequency-domain balance on the frequency-domain received signals. The invention obtains the low signal envelope fluctuation performance under the condition of maintaining the frequency spectrum efficiency, and the transmission reliability is ensured in lower complexity by the iterative received signal processing method based on the multi-user combined frequency-domain balance.

Description

technical field [0001] The invention relates to the field of communication, in particular to a method for generating a sending signal and processing a receiving signal in a communication system. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) has the advantages of simple implementation, robustness against frequency selective fading, and easy support of multi-antenna technology, so it has become an effective technology to support high-speed wireless communication. However, OFDM has the disadvantage of large fluctuations in the envelope of the transmitted signal, which limits its power efficiency, especially in the uplink of wireless communication systems. The single-carrier frequency-division multiple access (SC-FDMA) technology proposed in recent years overcomes the shortcomings of OFDM transmission and transmits signal envelope fluctuations, and can be realized by discrete Fourier transform extended OFDM (DFTS-OFDM), thus becoming a wireless ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/03
CPCH04L27/2697H04L27/2607H04L27/2698
Inventor 高西奇王闻今尤肖虎夏香根区国琛
Owner HUAWEI TECH CO LTD
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