Wideband Transceiver Using Segmented Parallel Channels
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Solution Overview
Problem
Wideband wireless communication systems face challenges in achieving precise and robust performance due to high power consumption and complexity in analog-to-digital conversion, particularly with wider bandwidths exceeding 100 MHz, where existing solutions like one-bit ADCs perform poorly at medium and high SNRs.
Innovation Solution
The solution involves combining multiple narrower-bandwidth transceivers working in parallel to achieve wider bandwidths, reducing power consumption and complexity by using Orthogonal or approximately orthogonal Subcarrier type of Modulation (OSM) with Transformed Time Domain (TTD) transformations, eliminating the need for high-speed ADCs and DACs with sampling frequencies above the Nyquist rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If multiple narrower-bandwidth transceivers are combined in parallel to achieve wider bandwidths, then power consumption and complexity increase linearly, but achieving precise and robust performance in wide bandwidth remains challenging
Solution Approach 1:
The patent divides the wideband signal processing into multiple narrower-bandwidth transceiver channels operating in parallel. Each transceiver handles a specific frequency segment, allowing the system to achieve wide bandwidth coverage while maintaining manageable power consumption and performance precision in each individual channel.
2Measurement precision
If ADC and DAC with sampling speed faster than 1G sample per second and bit resolution with more than 10 bits are used, then measurement precision is improved, but power consumption and complexity increase exponentially
Solution Approach 1:
Instead of using a single high-speed, high-resolution ADC/DAC that would consume excessive power and complexity, the patent segments the bandwidth into multiple narrower channels. Each channel uses lower-speed, lower-resolution converters, achieving the required overall precision through parallel processing while keeping individual converter complexity manageable.
Solution Approach 2:
The patent transitions from a single-dimension approach (one high-speed converter) to a multi-dimensional approach (multiple parallel converters operating at lower speeds). This dimensional change allows the system to achieve equivalent or superior precision by distributing the conversion task across multiple parallel paths, each handling a portion of the total bandwidth.
3Device complexity
If one-bit ADC is used to cut down system complexity and power consumption, then device complexity is reduced, but performance at medium and high SNRs deteriorates
Solution Approach 1:
The patent avoids using one-bit ADCs by segmenting the bandwidth into multiple narrower channels. Each channel can then use higher-resolution ADCs appropriate for its specific bandwidth and SNR requirements, maintaining good performance at medium and high SNRs while keeping overall system complexity manageable through the parallel architecture.
Data Source
AI summary
This invention discloses methods and circuits of wideband wireless transmitting and/or receiving by combining multiple RF transmitters and/or receivers, or multiple transceivers, each of which has a narrower bandwidth, e.g., producing a RF transmitter and receiver or a RF transceiver whose signal bandwidth is the sum or approximately the sum, e.g., slightly less than the sum, of the signal bandwidth of the multiple RF transmitters and/or receivers, or multiple RF transceivers. The embodiments apply in wireless communication systems with orthogonal or approximately orthogonal subcarrier type of modulation (OSM), e.g., Orthogonal Frequency Division Multiplexing (OFDM).