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Transmission tech. scheme for low peak equal ratio orthogonal frequency division multiplex

An orthogonal frequency division and transmission scheme technology, applied in the field of high-speed wireless communication transmission, can solve the problems of immaturity and low peak-to-average ratio performance

Active Publication Date: 2006-06-14
HUAWEI TECH CO LTD
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Problems solved by technology

However, the currently existing DFT-S-OFDM schemes only correspond to single-carrier systems with quadrature amplitude modulation (QAM), and their peak-to-average ratio performance is lower than that of single-carrier systems with offset quadrature amplitude modulation (OQAM)
In addition, the frequency domain shaping (Shaping) technology in the DFT-S-OFDM scheme plays an important role in further improving the peak-to-average ratio performance and spectral performance. The current shaping method is not yet mature.

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  • Transmission tech. scheme for low peak equal ratio orthogonal frequency division multiplex
  • Transmission tech. scheme for low peak equal ratio orthogonal frequency division multiplex
  • Transmission tech. scheme for low peak equal ratio orthogonal frequency division multiplex

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[0041] The invention provides a low peak-to-average ratio orthogonal frequency division multiplexing transmission technical solution, which meets the requirements of the wireless and mobile communication system, especially its uplink transmission link, on the low peak-to-average ratio of transmission signals. The low peak-to-average ratio OFDM transmission scheme of the present invention first recombines the real part and the imaginary part of the vector signal sequence obtained after coded modulation and serial-to-parallel conversion to obtain a real vector, and then expands the obtained real vector Discrete Fourier transform, followed by co-symmetric extension and root-mean-square raised cosine shaping in the transform domain, and then mapped to a set of subcarriers for OFDM, resulting in a low peak-to-average ratio and good spectral performance. Frequency division multiplexing transmission signal. The extended discrete Fourier transform used can be realized by fast discrete...

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Abstract

This invention relates to an OFDM transmission method of a low peak and equal ratio, which carries out reassembling of real part and a virtual part to the vector signal sequences got from the code regulation and serial-parallel transformation to get real vectors then carries out an extended dispersed Fourier transformation to the real vectors and a conjugate symmetric extension and a mean square root rising cosine shaping to be imaged onto a set of sub-carries of the OFDM to generate OFDM signals with fine spectrum performance and low peak and equal ratio.

Description

technical field [0001] The invention relates to a wireless transmission technical method, which belongs to the technical field of high-speed wireless communication transmission. Background technique [0002] Orthogonal frequency division multiplexing (OFDM) technology has been widely researched and applied due to its strong anti-multipath interference ability, simple and easy implementation of discrete Fourier transform (DFT), and easy adoption of multi-antenna transmission technology. And become an important candidate technology for future wireless and mobile communication systems. In the uplink transmission link of the wireless communication system, in order to improve the power efficiency of the mobile terminal and expand the coverage of the cell, the transmission signal is required to have a low peak-to-average power ratio (PAPR, referred to as peak-to-average ratio), and the typical OFDM transmission signal Has a high peak-to-average ratio. There are many ways to redu...

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Application Information

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IPC IPC(8): H04J11/00H04J1/00
Inventor 高西奇尤肖虎王炎盛彬潘志文
Owner HUAWEI TECH CO LTD
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