Implicit Transmission Mode Signaling via Signature Sequences
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Solution Overview
Problem
Existing wireless communication systems require inefficient explicit signaling to inform receiving devices about transmission modes using single or multiple antennas, consuming bandwidth and power due to the need for a preamble and header transmission using a single antenna.
Innovation Solution
A method and apparatus that select a signature sequence for each antenna to form a synchronization field, included in a preamble, allowing implicit signaling of transmission mode through pseudo-random sequences, enabling receiving devices to determine the transmission mode and scheme used by the transmitting device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If explicit signaling is used to inform receiving devices of transmission mode, then receiving devices can accurately determine transmission mode, but bandwidth and power consumption increase due to single-antenna preamble and header transmission
Solution Approach 1:
The synchronization field contains a signature sequence that enables receiving devices to self-determine the transmission mode without requiring separate explicit signaling. The receiving device processes the signature sequence in the synchronization field to automatically identify whether single-antenna or multiple-antenna transmission is used, eliminating the need for additional signaling overhead.
Solution Approach 2:
The synchronization field serves multiple functions: it provides timing synchronization, frequency offset estimation, and transmission mode indication all within a single field. By embedding the signature sequence in the synchronization field, the patent makes this field universal for multiple purposes, eliminating the need for separate explicit signaling fields.
2Adaptability or versatility
If explicit signaling procedure is performed with single-antenna preamble and header, then all receiving devices can properly decode the header, but the signaling procedure consumes unnecessary bandwidth and power
Solution Approach 1:
The receiving device autonomously determines the transmission mode by processing the signature sequence in the synchronization field, without requiring the transmitter to send separate explicit signaling. This self-determination mechanism maintains compatibility while improving bandwidth efficiency.
Solution Approach 2:
The patent changes the parameter of the synchronization field by embedding a signature sequence that encodes transmission mode information. This parameter change allows the synchronization field to carry additional information without increasing the physical layer structure, thereby improving bandwidth efficiency while maintaining device compatibility.
Data Source
AI summary
A method (200) for signaling a transmission mode in a wireless communication networks comprises selecting a signature sequence corresponding to the transmission mode of a transmitting device (S210); forming, for each antenna in the transmitting device, a synchronization field based on the selected signature sequence, wherein the synchronization field is included in a preamble (S220); and transmitting, from each antenna in the transmitting device, the data frame that comprises the preamble.