Transmit End Device Spatial Modulation Reliability
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Solution Overview
Problem
Existing spatial modulation technologies suffer from low transmission reliability due to deep fading, which causes transmission interruptions when an antenna selected for data transmission experiences deep fading conditions.
Innovation Solution
A transmit end device with N antennas, where N≥2, performs bit mapping to generate modulation symbols and determines a precoding matrix based on additional data bits to precoding process these symbols, ensuring data bits are transmitted across multiple antennas, thereby enhancing transmission reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If spatial modulation technology is used to simplify transmitter processing and reduce receiver decoding complexity, then device complexity is reduced, but transmission reliability deteriorates due to deep fading causing transmission interruptions
Solution Approach 1:
The data bits are segmented into two parts: first part bits are mapped to modulation symbols, and second part bits are used to determine the precoding matrix. This segmentation allows the system to distribute data across multiple antennas through precoding while maintaining the simplicity of spatial modulation, thereby improving transmission reliability without significantly increasing device complexity
Solution Approach 2:
A precoding matrix is introduced as an intermediary component between the modulation symbols and the multiple antennas. The precoding matrix distributes the modulation symbols across multiple antennas according to the second part of data bits, enabling reliable transmission even when some antennas experience deep fading, thus resolving the reliability issue while preserving the simplicity of the spatial modulation approach
2Ease of operation
If data bits are transmitted through a single antenna as in conventional spatial modulation, then transmitter processing is simplified, but transmission reliability worsens due to deep fading on the selected antenna
Solution Approach 1:
The system transitions from single-antenna transmission to multi-antenna transmission by introducing a precoding matrix that distributes data bits across multiple antennas. This dimensional change from one antenna to multiple antennas provides diversity against deep fading, improving transmission reliability while maintaining operational simplicity through the structured precoding approach
3Reliability
If precoding processing is applied to distribute data bits across multiple antennas, then transmission reliability is improved, but device complexity increases
Solution Approach 1:
The precoding matrix applies different processing to different parts of the data: the first part of data bits is mapped to modulation symbols, while the second part determines the precoding matrix selection. This local differentiation allows the system to achieve reliability improvement through precoding while keeping the processing complexity manageable by treating different data portions differently
Data Source
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AI summary
The present invention discloses a data transmission method, a transmit end device, and a receive end device. The method includes: performing bit mapping processing on a first part of bits of a first data bit group, to generate a first modulation symbol; determining a first precoding matrix from multiple preset precoding matrices according to a second part of bits of the first data bit group; performing precoding processing on the first modulation symbol according to the first precoding matrix, to obtain a first modulation symbol matrix; and transmitting the first modulation symbol matrix to a receive end device by using at least two antennas. According to the data transmission method in embodiments of the present invention, one part of bits of a data bit group is mapped to modulation symbols, the other part of bits is used to determine a precoding matrix, and precoding processing is performed on the modulation symbols according to the precoding matrix, to obtain a modulation symbol matrix, so that data bits after being precoded can be corresponding to multiple antennas, and a problem of low transmission reliability in spatial modulation can be resolved.