Modulation method capable of adjusting mapping mode of constellation points based on index modulation

Abstract

The invention discloses a modulation method capable of adjusting a mapping mode of constellation points based on index modulation. The method comprises the steps that a transmitting terminal is provided with a mode selector and a constellation point mapping selector, and a receiving terminal is provided with a mode detector and a constellation point mapping mode detector; a raw message sequence is divided into groups at the transmitting end; signal modulation is carried out through the mode selector and constellation point mapping selector of the transmitting terminal according to an active carrier mode and a constellation point modulation mode thereof, and signal transmission is carried out; the mode detector and constellation point mapping mode detector of the receiving terminal demodulate the modulated active carrier mode and constellation point modulation mode thereof through a maximum likelihood detection method and a shortest distance detection method, thereby recovering the raw message sequence. The constellation point mapping mode selected by each group is decided by the active subcarrier mode selected by each group, thereby improving the transmission efficiency and throughput as much as possible under the condition of limited transmission power.

Description

technical field [0001] The present invention relates to a signal modulation method in the field of communication, in particular to a modulation method based on carrier index modulation (IndexModulation) and an adjustable constellation point mapping mode of physical layer signal modulation technology. Background technique [0002] Wireless communication is a way of exchanging information by using electromagnetic waves to propagate in free space. At present, in the field of information communication, wireless communication develops the fastest and is most widely used. In order to make full use of the channel bandwidth, Orthogonal Frequency Division Multiple Access (OFDM) technology has a high status and is widely used in the development of wireless mobile communication. Orthogonal Frequency Division Multiple Access (OFDM) technology has the following characteristics: 1) high spectrum utilization; 2) simple implementation; 3) relatively simple channel equalization; 4) strong a...

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Problems solved by technology

[0006] Based on the existing carrier label modulation system, in order to overcome the defect of energy waste caused by different constellation point modulation amplitudes in different modes, the present invention proposes a modulation method with adjustable constellation point mapping based on carrier label modulation. Groups use different constellation point mapping methods for data modulation, that is, for groups with fewer sub-carriers, relatively higher-order modulation is selected; for groups with more sub-carriers, relatively low-order modulation is used, so that when the transmission power is fully utilized Next, send more message bits

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