Wireless LAN Receiver Sampling Rate Control for Power Efficiency
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Solution Overview
Problem
High-rate wireless communication systems face challenges in power consumption efficiency due to increased complexity and bandwidth requirements, leading to higher operating frequencies and circuit sizes, which result in increased power consumption and noise interference.
Innovation Solution
The method involves controlling the sampling rates of ADC, DAC, and modem processors based on channel bandwidth, optimizing power supply by setting the lowest sampling rate for control frames and highest for data packets, and selectively powering components only when necessary to reduce dynamic power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If higher order modulation scheme and channel bonding technique are applied to increase data rate, then data transfer rate is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent applies dynamics by making the sampling rate adjustable rather than fixed. The receiver dynamically changes its sampling rate based on the transmission mode (legacy or high throughput) to match the incoming signal characteristics. This allows the system to maintain high data rates when needed while reducing complexity and power consumption during normal operation.
Solution Approach 2:
The patent changes the sampling rate parameter adaptively. By detecting the transmission mode through control frames and adjusting the sampling rate accordingly (highest sampling rate for legacy mode, lowest for high throughput mode), the system optimizes its performance for each operating condition without being locked into a single complex configuration.
2Speed
If wider bandwidth is used for high-rate data transmission, then data transfer rate is improved, but operating frequency requirements and power consumption increase
Solution Approach 1:
The system dynamically adjusts the sampling rate based on the actual transmission mode being used. When high throughput mode is detected, the receiver switches to the lowest sampling rate, significantly reducing power consumption while maintaining the ability to handle wide bandwidth transmissions when necessary.
Solution Approach 2:
The patent applies partial action by using the highest sampling rate only when necessary (for legacy mode compatibility) and the lowest sampling rate for high throughput mode. This selective application of sampling rates optimizes power consumption while maintaining sufficient performance for each mode.
3Adaptability or versatility
If highest sampling rate is used for all transmission modes, then compatibility with legacy mode is improved, but power consumption efficiency deteriorates
Solution Approach 1:
The receiver dynamically selects the appropriate sampling rate based on the detected transmission mode. For legacy mode, it uses the highest sampling rate to ensure compatibility. For high throughput mode, it switches to the lowest sampling rate to optimize power efficiency, thus adapting to different operational requirements.
Solution Approach 2:
The sampling rate parameter is changed based on the transmission mode. The system detects whether legacy or high throughput mode is being used and adjusts the sampling rate accordingly, achieving both compatibility and power efficiency through parameter adaptation.
4Reliability
If control frame is received before data frame, then transmission reliability is improved, but time for data transmission is reduced
Solution Approach 1:
The patent applies preliminary action by having the transmitter send control frames (RTS/CTS) before the actual data frames. This allows the receiver to prepare its sampling rate in advance based on the control frame information, ensuring reliable reception while minimizing the time needed for rate adjustment during data transmission.
Data Source
AI summary
A method and apparatus of accessing a channel in a wireless local area network is provided. A destination station receives a request to send (RTS) frame to allocate a network allocation vector from a source station over a first bandwidth and transmits a clear to send (CTS) frame over a second bandwidth to the source station in response to the RTS frame. The second bandwidth is dynamically determined when a first parameter has a predetermined value.