Precoding Matrix Rotation for Wireless Security
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Solution Overview
Problem
Wireless communication systems face security challenges due to the vulnerability of information carried in free space, which can be easily intercepted, and existing MIMO precoding methods rely heavily on channel stability, leading to lower security when channel features change quickly.
Innovation Solution
A data transmission method that involves rotating a preset precoding matrix based on indication information shared between the transmit and receive ends, using a pseudo random keystream to instruct the rotation, thereby improving system security by allowing flexible transformation of the precoding matrix.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing MIMO precoding methods are used, then communication reliability is improved, but system security deteriorates when channel features change quickly
Solution Approach 1:
The precoding matrix is transformed from a static channel-dependent matrix to a dynamic matrix that changes according to a pseudo-random sequence. The base station generates a precoding matrix W(i) = V(i)F(i), where F(i) is a pseudo-random sequence that dynamically adjusts the precoding matrix independent of channel conditions, making eavesdropping difficult while maintaining communication reliability through proper synchronization at the receiver.
Solution Approach 2:
The invention changes the parameters of the precoding matrix by introducing a pseudo-random sequence F(i) that modifies the original channel-based precoding matrix V(i). This parameter transformation allows the system to maintain the reliability benefits of channel-based precoding while adding security through unpredictable parameter variations that prevent eavesdroppers from exploiting channel information.
2Productivity
If channel-dependent precoding is used, then system throughput is improved, but system security deteriorates due to quick channel feature changes
Solution Approach 1:
The precoding matrix incorporates a dynamic pseudo-random sequence F(i) that changes independently of channel conditions, creating a dynamic transmission pattern that maintains throughput through efficient precoding while preventing eavesdropping through unpredictable matrix transformations that do not rely on stable channel features.
Solution Approach 2:
The base station and user equipment pre-share a pseudo-random sequence generation rule before communication begins. This preliminary action allows both parties to independently generate the same sequence F(i) without transmitting it, enabling secure precoding matrix generation W(i) = V(i)F(i) while avoiding the security vulnerability of transmitting channel-dependent precoding information that eavesdroppers could intercept.
3Object-affected harmful factors
If physical layer security techniques are used, then eavesdropping error rate is reduced, but device complexity increases
Solution Approach 1:
The invention uses a pseudo-random sequence F(i) that can be independently regenerated at both the base station and user equipment based on a pre-shared generation rule. This copying approach allows the receiver to reconstruct the exact same precoding matrix transformation without complex cryptographic processing, reducing eavesdropping error rate while avoiding high device complexity through simple sequence generation and matrix multiplication.
Data Source
AI summary
A data transmission method, a base station, and user equipment are presented. The method includes performing rotation processing on a preset precoding matrix; performing precoding processing on to-be-sent information according to a precoding matrix obtained after the rotation processing; and sending to-be-sent information obtained after the precoding processing. In the embodiments of the present disclosure, indication information shared by a transmit end and a receive end is used to indicate whether to rotate a precoding matrix, and to-be-sent information is precoded according to the indication information. The transmit end and the receive end in this method learn the indication information in advance, and system security is improved by instructing the precoding matrix to perform flexible transformation.