Multiuser Spatial Modulation for High-Rate Cellular Links
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Solution Overview
Problem
MIMO systems face challenges with increased complexity and hardware costs, limiting their efficiency in multi-user spatial modulation for point-to-multipoint transmission, particularly in cellular communication systems where the number of receiving ends increases, leading to reduced additional modulation orders and data transmission rates.
Innovation Solution
A communication device and method that employs non-orthogonal multi-user spatial modulation by multiplexing antennas to share the same radio transmission resource, allowing multiple receiving ends to use the same antenna, thereby increasing the additional modulation order and data transmission rate, while using serial interference cancellation and predetermined mapping rules to optimize signal transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MIMO technology is applied to provide multiplexing gain and diversity gain, then data transmission rate is improved, but system complexity and hardware cost increase
Solution Approach 1:
The patent segments the data stream into multiple independent spatial modulation streams, each transmitted through a different antenna. This allows the system to achieve multiplexing gain similar to MIMO but with simpler per-antenna processing, reducing overall system complexity while maintaining high data transmission rates
Solution Approach 2:
The patent makes antennas serve multiple functions: each antenna can transmit spatial modulation signals and also function as a reference signal source for channel estimation. This multi-functionality reduces the need for separate reference signal resources, simplifying the system while improving spectral efficiency
2Adaptability or versatility
If the number of receiving ends increases in point-to-multipoint transmission, then coverage and service capability are improved, but additional modulation order and data transmission rate decrease
Solution Approach 1:
The patent merges the channel estimation function with the data transmission function by using the same antenna to transmit both spatial modulation signals and reference signals. This allows multiple users to share the same time-frequency resources without requiring separate reference signal resources, maintaining high modulation orders even as the number of users increases
Solution Approach 2:
The patent introduces spatial dimension as an additional resource dimension by using different antennas for different users within the same time-frequency slot. This spatial multiplexing in the spatial domain allows the system to serve multiple users simultaneously without reducing the modulation order, thereby maintaining high data transmission rates
3Device complexity
If spatial modulation is used for point-to-multipoint transmission, then system complexity is reduced, but the number of supportable users and additional modulation order are limited
Solution Approach 1:
The patent implements dynamic user allocation to spatial resources by allowing flexible assignment of antennas to different users based on channel conditions and traffic requirements. This dynamic allocation enables the system to support a variable number of users without increasing system complexity, as the same simple spatial modulation framework is reused with different antenna assignments
Data Source
AI summary
A communication device includes a processing circuit, the processing circuit being configured as: mapping a first information bit part used for a receiving end to a corresponding channel based on a pre-set mapping rule so as to execute spatial modulation with respect to the first information bit part of the receiving end; allocating a transmission power to the receiving end; and controlling the transmission power allocated through a mapped channel to transmit a second information bit part used for the receiving end. In the case of the first information bit parts used for multiple receiving ends being the same, the channels mapped for multiple receiving ends are the same. The multi-user spatial modulation performs spatial modulation for multiple receiving ends at the same time through a multiplexing channel of the transmitting end, improving the additional modulation order and the data transmission rate which can be obtained by each receiving end.