Space-code two-dimensional index modulation wireless communication system and method

Abstract

The invention discloses a space-code two-dimensional index modulation wireless communication system and method, and belongs to the technical field of wireless communication. According to a space-code two-dimensional index modulation scheme, two kinds of index resources are adopted for participating in indexing; a space index is combined with a code index; a transmission end is used for splitting an in-phase component and an orthogonal component of a baseband modulation symbol through a multi-antenna communication system mapped by the two-dimensional index; an orthogonal mapping way is adopted; independent index mapping is performed; a PN code required by current component frequency spread and an activated antenna are selected separately. When a receiving end detects information through a detection algorithm in an estimation way, information detection is performed according to an in-phase branch and an orthogonal branch of a signal. By adopting the space-code two-dimensional index modulation wireless communication system and method, a space modulation antenna indexing way is combined with a code index modulation indexing way, and an orthogonal mapping way is adopted, so that an antenna index and a code index are reutilized repeatedly, and information bits transmitted by index mapping are improved. The system frequency spectrum efficiency is increased, and the consumption of index resources is lowered.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to multi-input multi-output space modulation, direct sequence spread spectrum communication and code index modulation technology, in particular to a code index mapping method for two-dimensional index modulation. Background technique [0002] With the increasing development and wide application of digital communication technology, digital modulation technology, as an extremely important aspect in this field, has also developed rapidly. In recent years, the research on digital modulation technology has been mainly centered on fully saving the spectrum and efficiently utilizing the available frequency band. The former refers to the spectrum occupancy rate of the modulated signal, and the latter refers to the utilization of the available frequency band of the channel. Rate. It is against this background that waveform modulation techniques such as spread spectrum modulatio...

AI Technical Summary

Problems solved by technology

The advantage of two-dimensional index modulation is that the number of information bits transmitted invisibly is increased through two index methods, so it has more advantages in terms of energy efficiency and spectrum efficiency; the disadvantage is that the demodulation complexity at the receiving end is large, and it is difficult to Obtain channel state information through precoding technology

However, there are still some problems in the current CIM system. For example, in order to obtain a high transmission rate, a large number of PN codes need to be used, so that the receiving end needs a large number of correlators to realize the correlation detection of the PN codes used by the transmitting end.

At the same time, there is no research on two-dimensional index modulation that combines antenna index and code index

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