Multi-Mode Receiver for Wireless Signal Throughput
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Solution Overview
Problem
Direct sequence spread spectrum communications systems, such as those used in the IEEE 802.15.4 standard, reduce data throughput due to spread spectrum encoding, limiting the usability of hardware and capacity of processing equipment.
Innovation Solution
A multi-mode receiver is designed to process data packets using either spread spectrum or non-spread spectrum modulation, allowing for increased data rate throughput by identifying the modulation format through a header delimiter and selectively enabling processing circuits to conserve energy and improve demodulation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If direct sequence spread spectrum encoding is used, then interference rejection is enhanced, but data throughput is reduced
Solution Approach 1:
The receiver dynamically switches between spread spectrum and non-spread spectrum processing modes based on the detected modulation format in the data packet header. This allows the system to adaptively select the optimal processing mode, using spread spectrum mode when interference rejection is needed and non-spread spectrum mode when higher throughput is required, thereby resolving the contradiction between reliability and productivity
Solution Approach 2:
The system changes the processing parameters by detecting the modulation format (spread spectrum or non-spread spectrum) from the packet header and adjusting the receiver's processing mode accordingly. This parameter change enables the receiver to optimize both interference rejection and data throughput by selecting the appropriate processing mode based on the actual signal characteristics
2Reliability
If spread spectrum encoding is applied, then communication reliability over extended range is improved, but hardware usability and processing capacity are limited
Solution Approach 1:
The receiver is designed with multi-functionality to handle both spread spectrum and non-spread spectrum modulation formats. By incorporating both processing modes in a single receiver, the hardware becomes more versatile and usable for a broader range of applications, including both IEEE 802.15.4 standard communications and higher throughput applications, thereby resolving the contradiction between reliability and adaptability
Solution Approach 2:
The receiver dynamically adapts its processing mode based on the detected modulation format, allowing the same hardware to efficiently handle both spread spectrum communications (for reliability) and non-spread spectrum communications (for throughput and versatility), thus resolving the contradiction between communication reliability and hardware usability
3Length of moving object
If IEEE 802.15.4 standard is used, then extended range communication is achieved, but data rate throughput is reduced
Solution Approach 1:
The receiver dynamically switches between processing modes based on the packet header's modulation format indicator. When non-spread spectrum modulation is detected, the receiver switches to non-spread spectrum processing mode, enabling higher data rates while maintaining the ability to communicate over extended ranges when spread spectrum mode is used, thus resolving the contradiction between communication range and data rate throughput
Solution Approach 2:
The system changes its operating parameters by detecting the modulation format from the packet header and adjusting the processing mode accordingly. This allows the receiver to optimize for either extended range (using spread spectrum mode) or higher data rates (using non-spread spectrum mode), resolving the contradiction between communication range and data rate throughput
Data Source
AI summary
An apparatus (200) and method (300) for receiving a communications signal. A spread spectrum signal demodulator (210) is adapted to demodulate a packet header (110) of a data packet (102) that is communicated by a wireless communications signal. The packet header (110) is modulated with a spread spectrum technique and the spread spectrum signal demodulator (210) produces a packet header detection signal (220) representing a successful detection of a predefined packet header value. A non-spread spectrum signal demodulator (212) is communicatively coupled to the spread spectrum signal demodulator (210) and demodulates, in response to the packet header detection signal (220), a non-spread spectrum modulated data payload within the data packet. A data output select (234) produces demodulated data produced by either one or both the spread spectrum signal demodulator (210) and the non-spread spectrum signal demodulator (212).