Compensation Circuit for Unused Tone Error Reduction in Partial Bandwidth Wireless
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Solution Overview
Problem
In wireless local area networks, especially those using OFDMA protocols like WIFI-6, unused tone errors due to IQ mismatches in transmitter circuitry cause interference with other devices' allocated resource units, violating emission standards and affecting network performance.
Innovation Solution
An apparatus and method that dynamically selects and applies compensation sets based on allocated resource units to reduce unused tone errors, using a compensation circuit, digital-to-analog converter, mixer, and power amplifier to upconvert and amplify signals, with stored compensation sets in non-volatile memory, optimizing IQ imbalance compensation for partial bandwidth networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If partial bandwidth allocation is used to support multiple devices, then network capacity and resource utilization are improved, but unused tone errors cause interference to other devices' resource units
Solution Approach 1:
The system performs preliminary calibration to determine optimal compensation sets for each resource unit configuration before actual data transmission. The compensation sets are pre-calculated and stored in lookup tables, allowing the transmitter to quickly apply the appropriate compensation without real-time computation delays.
Solution Approach 2:
The system dynamically adjusts compensation parameters based on the allocated resource unit characteristics (position and size). Different compensation sets with varying complex values are selected and applied depending on the specific RU allocation, optimizing the compensation effect for each scenario.
2Reliability
If compensation sets are applied to reduce unused tone errors, then emission compliance is improved, but device complexity increases due to multiple compensation sets and selection circuitry
Solution Approach 1:
The calibration process is performed in advance during manufacturing or initialization, determining and storing optimal compensation sets for various resource unit configurations. This preliminary action eliminates the need for complex real-time calculations during data transmission.
Solution Approach 2:
Pre-calculated compensation sets are stored in lookup tables within the device. Instead of performing complex computations during operation, the system copies and applies the appropriate pre-determined compensation values from these tables based on the current resource unit allocation.
3Object-generated harmful factors
If dynamic compensation set selection is implemented, then unused tone error reduction is improved, but processing time and computational overhead increase
Solution Approach 1:
All compensation set calculations are performed in advance during calibration, and the results are stored in lookup tables. During actual data transmission, the system only needs to identify the current resource unit allocation and retrieve the corresponding pre-computed compensation set, dramatically reducing processing time.
Solution Approach 2:
The system uses pre-computed compensation values stored in memory rather than performing real-time mathematical computations. The lookup table approach allows for rapid copying and application of compensation parameters without intensive processing during data transmission.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces spurious emissions and interference in unused tones, ensuring compliance with emission standards and improving network performance by selecting optimal compensation sets for each resource unit, thereby minimizing unused tone errors and enhancing transmission efficiency.
Implementation Method 1
a digital-to-analog converter to convert the compensated digital complex signal to a compensated analog complex signal
Implementation Method 2
a mixer coupled to the digital-to-analog converter to upconvert the compensated analog complex signal to a radio frequency (RF) signal
Implementation Method 3
a power amplifier coupled to the mixer to amplify the RF signal
Data Source
AI summary
In one embodiment, an apparatus includes: a compensation circuit to select one of a plurality of compensation sets based on an allocated resource unit (RU) and compensate a digital complex signal using the selected compensation set; a digital-to-analog converter to convert the compensated digital complex signal to a compensated analog complex signal; a mixer coupled to the digital-to-analog converter to upconvert the compensated analog complex signal to a radio frequency (RF) signal; and a power amplifier coupled to the mixer to amplify the RF signal.