Mobile Terminal Spread Spectrum with Dynamic PN Sequence Switching
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Solution Overview
Problem
In spread spectrum communication, the static PN sequence used for modulation and demodulation can be compromised by lawbreakers who can determine the start bit of the PN sequence over time, leading to potential eavesdropping and lack of communication confidentiality.
Innovation Solution
Randomly selecting and changing the PN sequence for each communication process by using pre-configured first and second standard PN sequences, where the start bit serial numbers are allocated by the base station, and XORing the low-frequency digital sequence with cyclic PN sequences to generate and transmit spread sequences, thereby enhancing communication security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a static PN sequence is used for spread spectrum communication, then the communication process is simple and stable, but the confidentiality is compromised as lawbreakers can intercept and decode the communication over time
Solution Approach 1:
The patent applies dynamics by making the PN sequence changeable rather than static. Specifically, it uses a hash function to generate different PN sequences based on varying parameters (such as time, location, or communication identifiers), ensuring that the spreading sequence dynamically adapts to different communication conditions. This prevents lawbreakers from intercepting and decoding communications over time, as the sequence is no longer predictable or reusable.
Solution Approach 2:
The patent changes the parameters of the PN sequence by introducing variable inputs to the hash function (such as time stamps, location data, or communication-specific identifiers). These parameter changes ensure that even if the same communication occurs under different conditions, the resulting PN sequence will be different, thereby enhancing security against interception and replay attacks.
2Object-affected harmful factors
If the PN sequence is changed randomly for each communication process, then the confidentiality is improved, but the complexity of the communication system increases
Solution Approach 1:
The patent replaces the traditional mechanical or manual method of PN sequence selection with a cryptographic hash function. Instead of manually configuring or randomly selecting sequences, the system uses mathematical hashing to automatically generate secure, deterministic, yet unpredictable PN sequences based on input parameters. This substitution reduces the need for complex manual configuration while maintaining high security standards.
Solution Approach 2:
The system performs self-service by automatically generating the appropriate PN sequence through the hash function based on the communication context. Both the transmitting and receiving ends independently compute the same sequence using the same input parameters, eliminating the need for external coordination or complex key distribution mechanisms. This self-generating capability simplifies the overall system architecture while ensuring security.
Data Source
AI summary
Disclosed are a mobile terminal, a base station and a non-transitory computer-readable medium to securely receive a signal. When the mobile terminal sends information, randomly implementing an XNOR calculation is randomly implemented on corresponding digits of a low-frequency digital sequence which is to transmit the information and a first cyclic PN sequence or a second cyclic PN sequence so as to obtain spread sequences. The spread sequences are modulated and sent. The base station or the mobile terminal receives the spread sequence, and despreads the same using the first and second cyclic PN sequences. The present invention effectively prevents lawbreakers from decoding and monitoring a communication process.