Wireless Transmission and Reception Gain Control Without Preamble Blocks
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Solution Overview
Problem
Existing wireless communication systems face challenges in performing gain control when frames do not include a preamble signal block, as the necessary processing for transmission and reception gain control is not sufficiently addressed.
Innovation Solution
A wireless communication system that includes a transmitter with an automatic and fixed gain controller for frames with/without preamble signal blocks, and a receiver with correlation calculators and threshold detectors to determine appropriate gain control based on the presence of preamble signal blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a frame does not include a preamble signal block, then the frame structure is simplified and more flexible, but transmission and reception gain control cannot be properly performed
Solution Approach 1:
The system performs preliminary gain control calculations using loopback signals from the power amplifier before transmission. The transmitter calculates the required gain adjustment based on the difference between loopback signal power and transmission signal power, and applies this gain control in advance to ensure proper signal levels even when no preamble is present
Solution Approach 2:
A loopback signal path is introduced as an intermediary mechanism. The loopback signal from the power amplifier serves as a reference for gain control calculations, enabling the system to determine appropriate gain adjustments without relying on preamble signals in the transmitted frame
2Reliability
If a preamble signal block is included in every frame, then gain control and synchronization are reliable, but the frame structure becomes more complex and less flexible
Solution Approach 1:
The patent extracts the gain control function from the preamble signal block and implements it separately using loopback signals. This allows the system to perform necessary gain control operations without requiring preamble signals to be present in every frame, thereby reducing frame structure complexity while maintaining control reliability
3Measurement precision
If the number of preamble signal blocks is increased, then synchronization and gain control accuracy improve, but the transmission overhead and processing complexity increase
Solution Approach 1:
The system uses itself (the transmitted signal) as the reference for gain control through the loopback path. The power amplifier's own output is fed back to provide the reference signal needed for gain calculations, eliminating the need for external preamble signals and reducing transmission overhead
Data Source
AI summary
The present invention allows a gain control to be appropriately effected even when a frame including no preamble signal block is used for wireless communications. The following processes are effected in a transmission power control unit 106 of a transmission unit. Specifically, an automatic transmission gain control unit 201 multiplies a transmission signal by a gain value that is the difference between the power of a signal loop-backed from a power amplifier 109 and the power of the transmission signal. A fixed transmission gain multiplying unit 202 multiplies the transmission signal by a predetermined gain value or by the gain value used in the automatic transmission gain control unit 201 during the preceding frame. A selection unit 203 selects the transmission signal as gain-controlled by the automatic transmission gain control unit 201 in a case of a preamble signal block being included in the frame of the transmission signal and selects the transmission signal as gain-controlled by the fixed transmission gain multiplying unit 202 in a case of no preamble signal block being included in the frame of the transmission signal.