Circular convolution hexagonal multicarrier transmission method

Abstract

The invention provides a circular convolution hexagonal multicarrier transmission method. The method comprises the following steps: determining the number of sub symbols contained in a sent data block; determining the number of to-be-sent data symbols according to the number of the sub symbols and the number of subcarriers; carrying out shift and zero fill on each to-be-sent data symbol according to the position of a belonging sub symbol on the time to obtain a corresponding sending vector; separately carrying out circular convolution operation on each sending vector and a Gauss pulse shaping function, and carrying out frequency modulation on a circular convolution result according to the sub symbols and the subcarriers belonging to the sending vector to obtain a pulse signal carrying the data symbol information; accumulating the pulse signals to obtain a multicarrier signal; and adding a cyclic prefix for the multicarrier signal according to the maximum delay extension of a channel to form a to-be-send baseband signal. The circular convolution hexagonal multicarrier transmission method provided by the embodiment of the invention has very strong double-selection channel resistance, realizes higher spectrum effectiveness of the to-be-send signal, and meanwhile reduces the peak-to-average power ratio.

Description

technical field [0001] Embodiments of the present invention relate to the field of signal modulation, in particular to a circular convolution hexagonal multi-carrier transmission method. Background technique [0002] In some new applications, such as high-speed rail broadband communication mobile communication, broadband underwater acoustic communication, etc., due to the high-speed movement of objects, or the low propagation speed of underwater acoustic signals (about 1500m / s), the wireless channel will be different in frequency and time. Selectivity is formed, becoming a so-called dual-selective channel. How to realize efficient data transmission under the condition of dual channel selection is a research hotspot and difficulty in the field of mobile broadband communication. [0003] Hexagonal Multicarrier Transmission (English name: Hexagonal Multicarrier Transmission, hereinafter referred to as: HMT) technology. HMT does not need to add a cyclic prefix, and uses the Ga...

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Problems solved by technology

[0009] Depend on image 3 It can be seen that when 12 effective HMT symbols are sent, the time domain signal duration of HMT reaches 9.5×10 - 4 s, the reason is that the length of the shaped pulse is larger than the symbol length of the HMT, which will undoubtedly lead to a decrease in spectral efficiency, especially when fewer HMT symbols are transmitted

[0010] In addition, the amplitude at the beginning and end of the HMT transmission signal is very small, close to zero, which will cause a large peak-to-average power ratio of the HMT signal and reduce the working efficiency of the linear power amplifier

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