Method and device for diversity signal sending

Abstract

The invention discloses a method for transmitting signals in diversity, which comprises the following steps: A. performing serial-parallel transformation and Fourier transformation on the input signal in sequence; B. dividing the input signal obtained by the Fourier transformation into two signals with equal lengths, respectively The two signals are space-frequency coded; the parity positions of the first signal in the two signals obtained by space-frequency coding are respectively composed of the data sequences of the two signals obtained by division; the parity positions of the second signal are respectively obtained by the division of the two signals The data conjugate sequence of the signal is formed, and the odd or even position of the signal is formed by taking the negative after conjugating the data corresponding to the even or odd position of the first signal; C. Two channels after space-frequency encoding After the signals are modulated and processed separately, they are sent out by the two antennas respectively. At the same time, the invention also proposes a device for sending signals in diversity. The scheme of the present invention can guarantee the low peak-to-average ratio characteristic of the output signal through simulation experiments.

Description

Technical field [0001] The present invention relates to the field of communication technology, in particular to a method and device for transmitting signals in diversity. Background technique [0002] The Orthogonal Frequency Division Multiplexing (OFDM) technology in the communication field is to modulate the transmitted data symbols in parallel on multiple sub-carriers overlapping and orthogonal to each other for transmission. On the one hand, the serial-to-parallel conversion of data symbols will increase the symbol period on each sub-carrier, which can minimize the impact of time dispersion caused by the multipath delay spread of the wireless channel on the system and avoid frequency selection. On the other hand, the orthogonality between sub-carriers can effectively use bandwidth and increase system capacity. At the same time, in order to avoid symbol interference between symbols, a cyclic prefix or guard interval is inserted between symbols to eliminate inter-symbol interfe...

AI Technical Summary

Problems solved by technology

[0015] The present invention provides a method and device for sending signals in diversity, which is used to solve the problem in the prior art that DFT-s OFDM combined with SFBC technology cannot guarantee low peak-to-average ratio

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