TFI-OFDM UWB Transmission Mitigating Piconet Interference
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Solution Overview
Problem
Conventional TFI-OFDM systems face interference and data collision issues due to simultaneous operation of adjacent piconets in ultra-wide band (UWB) communication, leading to degraded performance and loss of data in multi-path fading channels.
Innovation Solution
A TFI-OFDM transmission and reception system that generates and encodes data, applies IFFT for OFDM symbol creation, and transmits these symbols in both positive and negative frequency domains, with sequential transmission in multiple frequency bands to mitigate collisions, using a convolutional encoder and interleaver for error correction and power measurement to detect collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional TFI-OFDM transmission scheme is used, then data transmission is performed in frequency domain, but collisions occur between adjacent piconets simultaneously operating in the same frequency band
Solution Approach 1:
The patent extends the transmission scheme from purely frequency domain to time-frequency domain by sequentially transmitting OFDM symbols multiple times across different frequency bands. This dimensional extension allows piconets to differentiate their transmissions in the time domain, preventing collisions even when operating in the same frequency band simultaneously.
Solution Approach 2:
The patent implements preliminary actions by transmitting OFDM symbols sequentially multiple times before potential collisions can occur. The buffer stores previously transmitted symbols, and the system re-transmits symbols in different frequency bands at different time slots, ensuring that any potential collision is avoided by establishing transmission priority and timing beforehand.
2Object-affected harmful factors
If multi-band system is used to cope with interference, then interference resistance is improved, but performance is degraded due to energy loss in multi-path fading channel
Solution Approach 1:
The patent maintains continuous useful action by sequentially transmitting OFDM symbols multiple times across different frequency bands. Instead of allowing energy to be lost in multi-path fading, the system continuously re-transmits symbols in different frequency bands, ensuring that at least one transmission path remains effective and energy is not wasted due to fading.
Solution Approach 2:
The patent changes transmission parameters by switching between different frequency bands for sequential transmissions. The system varies the frequency band parameter across time slots, allowing the receiver to select the best transmission path and avoiding energy loss that would occur if a single frequency band was used in multi-path fading conditions.
3Reliability
If OFDM symbols are transmitted sequentially multiple times in time domain, then collision mitigation is achieved, but transmission time is increased
Solution Approach 1:
The patent uses the frequency domain as an additional dimension to reduce time-domain transmission duration. By transmitting OFDM symbols in multiple frequency bands sequentially, the system achieves collision mitigation without requiring excessive time-domain extension, as the frequency diversity provides additional separation between transmissions.
Data Source
AI summary
A TFI-OFDM transmission system for a UWB communication that includes a data generator generating data having a rate corresponding to a transmission speed mode, a convolutional encoder convolutional-encoding the data into a certain number of data groups, an OFDM modulator outputting OFDM symbols by executing an IFFT the data groups a buffer temporarily storing the OFDM symbols to sequentially transmit the OFDM symbols in a time domain at least two times, and a frequency generator generating certain frequencies to transmit the OFDM symbols in a certain number of frequency bands corresponding to transmission channels.