Wireless Receiver Preamble Addressing for Power Reduction
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Solution Overview
Problem
Wireless receivers in communication systems spend excessive time in high-power states, leading to increased power consumption, especially when they are not the intended recipient of packets, as they continue to decode packets intended for other devices.
Innovation Solution
Implementing a method where data units include short training field (STF) sequences encoded with pseudo-random spreading codes based on the addressee, allowing receivers to quickly determine if they are the intended recipient, and if not, refrain from decoding and transition to a low-power state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless receivers continuously decode packets to ensure they receive intended communications, then communication reliability is improved, but power consumption increases
Solution Approach 1:
The packet structure is segmented into a preamble portion and a data portion. The receiver only processes the preamble portion to determine if the packet is intended for it, and only decodes the data portion if the packet is addressed to the receiver. This segmentation allows the receiver to avoid unnecessary full packet decoding, thereby reducing power consumption while maintaining reliable communication for intended packets.
2Reliability
If wireless receivers decode all received packets to ensure no intended packet is missed, then packet delivery reliability is improved, but the time spent in high-power state increases
Solution Approach 1:
The packet includes a preamble portion containing addressing information that is processed before the main data portion. The receiver performs preliminary decoding of the preamble to determine if the packet is intended for it before committing to full packet decoding. This preliminary action allows the receiver to quickly identify and discard packets not intended for it, reducing the time spent in high-power state while ensuring no intended packets are missed.
3Measurement precision
If wireless receivers process complete packets including all training fields, then signal quality assessment is improved, but power consumption increases
Solution Approach 1:
The receiver performs partial processing by decoding only the preamble portion of packets that are not intended for it, rather than processing the complete packet including all training fields and data portions. This partial action is sufficient to determine packet intent and signal quality assessment for filtering purposes, while significantly reducing power consumption compared to full packet processing.
Data Source
AI summary
Systems, methods, and devices for communicating in a wireless network are described herein. In an aspect, a method of transmitting a data unit includes generating a data unit. The data unit includes one or more short training field (STF) sequences. The method further includes encoding each of the STF sequences with a pseudo-random spreading code. The code is based on an addressee of the data unit. The method further includes transmitting, at a transmitter, the data unit over a wireless channel. In another aspect, a method of processing a data unit includes receiving, at a receiver, a data unit. The data unit includes one or more STF sequences. The method further includes determining whether the data unit comprises one or more differentially encoded symbols. The method further includes receiving one or more long training field (LTF) sequences when the data unit does not comprise one or more differentially encoded symbols.