Scrambler Seed Value for RTS CTS PAPR Reduction
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Solution Overview
Problem
Existing wireless communication technologies face challenges in effectively scrambling wireless transmissions to increase randomness and reduce peak-to-average power ratio (PAPR), particularly in managing persistent interference between wireless signals.
Innovation Solution
The method involves determining a scrambler seed value with at least 11 bits, where at least one of the 7 least significant bits (LSBs) has a non-zero value, and generating a scrambling sequence based on this seed value and a polynomial. This scrambling sequence is used to construct and scramble physical layer convergence protocol (PLCP) protocol data units (PPDUs) containing multi-user (MU) request-to-send (RTS) frames, which are then transmitted over a wireless medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If scrambling sequences are used to increase randomness of wireless transmissions, then the peak-to-average power ratio (PAPR) is reduced, but the device complexity increases due to additional scrambling operations
Solution Approach 1:
The patent changes the parameters of the scrambling sequence by using a longer sequence length (e.g., 31 bits instead of traditional shorter sequences) and modifying the polynomial generator. This parameter change increases randomness more effectively, thereby reducing PAPR while managing complexity through standardized implementations.
Solution Approach 2:
The patent applies different scrambling sequences to different portions of the transmission (e.g., different spatial streams, frequency subcarriers, or time slots). This local differentiation increases overall randomness and reduces PAPR without requiring the entire system to handle maximum complexity simultaneously.
2Reliability
If scrambling sequences are used to randomize persistent interference between wireless signals, then communication reliability is improved, but the computational requirements increase
Solution Approach 1:
The patent employs periodic scrambling sequences that repeat after a defined period. This periodicity allows receiving devices to efficiently generate and correlate the same sequences for descrambling, reducing computational energy while maintaining reliability through consistent randomization of interference patterns over time.
Solution Approach 2:
The transmitting and receiving devices use identical copies of the scrambling polynomial and sequence generation algorithm. This copying approach ensures that both ends can generate the same scrambling sequence without complex key exchange or synchronization, reducing computational overhead while improving reliability through consistent interference randomization.
Data Source
AI summary
This disclosure provides systems, methods, and apparatuses for wireless communication that can be used to reduce the peak-to-average power ratio (PAPR) of data transmissions by increasing the degree of randomness with which data is scrambled for transmission over a wireless medium. In some implementations, a transmitting device may determine a scrambler seed value that includes at least 11 bits, where at least one of the 7 least significant bits (LSBs) of the scrambler seed value has a non-zero value. The transmitting device may generate a scrambling sequence based on the scrambler seed value and a polynomial, may construct a physical layer convergence protocol (PLCP) protocol data unit (PPDU) that includes a multi-user (MU) request-to-send (RTS) frame and the scrambler seed value, may scramble one or more portions of the PPDU based on the scrambling sequence; and may transmit the PPDU over a wireless medium.