Wireless Diversity Receiver Subband Combining
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Solution Overview
Problem
Conventional antenna diversity systems require full receiver and baseband signal paths for each antenna, leading to high complexity, cost, and power consumption, and may not provide sufficient diversity gain in channels with frequency-selective fading.
Innovation Solution
A wireless diversity receiver with multiple signal processing paths, including a bin-wise combiner and an inverse transformation module, that downconverts RF signals, transforms them into subbands, combines these subbands, and performs inverse transformation to generate a time-domain signal, allowing for reduced complexity and enhanced diversity gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If full receiver and baseband signal paths are used for each antenna, then diversity gain is improved, but device complexity increases
Solution Approach 1:
The patent segments the frequency spectrum into multiple subbands using FFT transformation. Each subband is processed independently through separate diversity combining paths, allowing selective application of diversity processing only where needed in the frequency domain rather than processing the entire bandwidth with full receiver paths for each antenna.
Solution Approach 2:
The patent transforms the problem from the time domain to the frequency domain using FFT, introducing a frequency dimension for diversity combining. This allows subband-specific processing where diversity combining is applied in the frequency domain rather than requiring time-domain processing for all frequencies, reducing overall system complexity.
2Reliability
If full receiver paths are used for each antenna, then signal quality is improved, but power consumption increases
Solution Approach 1:
The receiver processes different frequency subbands separately using FFT decomposition. Full diversity processing is applied only to subbands that require it, while other subbands can use simpler processing, thereby reducing overall power consumption compared to applying full processing to the entire signal bandwidth.
Solution Approach 2:
The patent applies diversity combining selectively to specific subbands rather than uniformly to all frequency components. This partial application of complex processing only where needed maintains signal quality for affected subbands while reducing total power consumption across the entire receiver system.
3Reliability
If conventional diversity combining is used, then diversity gain is achieved, but complexity is reduced only partially
Solution Approach 1:
The patent introduces frequency-domain processing through FFT transformation, adding a frequency dimension to the diversity combining process. This allows independent processing of different frequency subbands, achieving better diversity gain for frequency-selective fading channels while managing complexity through selective subband processing rather than uniform time-domain processing.
Solution Approach 2:
By dividing the frequency spectrum into multiple subbands, the patent enables selective diversity combining applied only to specific subbands that benefit from it. This segmentation allows the system to achieve diversity gain where needed while avoiding unnecessary processing complexity in subbands that don't require full diversity processing.
Data Source
AI summary
A system may comprise a plurality of signal processing paths, a bin-wise combiner, an inverse transformation block, and a DAC. Each signal processing path may comprise a transformation block that is operable to transform a first time-domain digital signal to an associated frequency-domain signal having a plurality of subband signals. The bin-wise combiner may be operable to combine corresponding subband signals of the plurality of signal processing paths. The inverse transformation block may be operable to transform output of the bin-wise combiner to an second time-domain signal. The DAC may be operable to converts the second time-domain signal to a corresponding analog signal.