OFDM Frequency-Domain Compression for BTS Serial Link Capacity
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Solution Overview
Problem
Wireless communication networks face challenges in managing increasing data volumes and evolving standards, leading to the need for enhanced capacity in serial data links within base transceiver systems, while also requiring cost-effective solutions that avoid expensive hardware upgrades.
Innovation Solution
Implementing frequency domain compression in base station transceiver systems, where RF units transform and compress signal samples into the frequency domain, apply attenuation profiles, and transmit these samples across data links to baseband processors for decompression and further processing, thereby increasing data link capacity and reducing processing overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frequency domain compression is implemented in base station transceiver systems, then data link capacity is increased and processing overhead is reduced, but system complexity increases due to additional compression and decompression operations
Solution Approach 1:
The patent replaces time-domain signal processing with frequency-domain processing using Fast Fourier Transform (FFT). This substitution allows compression operations to be performed more efficiently in the frequency domain, achieving higher data link capacity while managing system complexity through mathematical transformation rather than additional physical processing stages.
Solution Approach 2:
The patent changes the representation parameters of signal samples from time-domain to frequency-domain. By transforming the signal parameters and applying compression in the frequency domain, the system achieves increased data link capacity. The inverse FFT then transforms the compressed frequency-domain samples back to time-domain for baseband processing, maintaining compatibility with existing systems.
2Productivity
If hardware upgrades are performed to increase data link capacity, then system capacity is improved, but cost increases significantly
Solution Approach 1:
The patent achieves increased data link capacity through parameter changes in the signal processing domain rather than hardware upgrades. By implementing frequency-domain compression that reduces the number of samples requiring transmission, the system effectively increases data link capacity without requiring additional or upgraded hardware infrastructure, thereby avoiding significant costs.
3Measurement precision
If more signal samples are transmitted over data links to maintain processing accuracy, then measurement precision is improved, but data volume increases requiring higher capacity links
Solution Approach 1:
The patent substitutes time-domain sampling with frequency-domain representation. Instead of transmitting multiple time-domain samples to capture signal characteristics, the system transforms signals to the frequency domain where the essential spectral information is concentrated in fewer coefficients, reducing data volume while maintaining processing accuracy.
Solution Approach 2:
The patent changes the parameter representation from time-domain samples to frequency-domain coefficients. This parameter transformation allows the same signal information to be represented with fewer data points, reducing the quantity of data that must be transmitted while preserving the precision needed for baseband signal processing.
Data Source
AI summary
A method and apparatus provides OFDM signal compression for transfer over serial data links in a base transceiver system (BTS) of a wireless communication network. For the uplink, an RF unit of the BTS applies OFDM cyclic prefix removal and OFDM frequency transformation of the baseband signal samples followed by frequency domain compression of the baseband signal samples, resulting from analog to digital conversion of received analog signals followed by digital downconversion, forming compressed coefficients. After transfer over the serial data link, the baseband processor applies frequency domain decompression to the compressed coefficients prior to further signal processing. For the downlink, the RF unit performs frequency domain decompression of the compressed coefficients and applies OFDM inverse frequency transformation of the decompressed coefficients and OFDM cyclic prefix insertion prior to digital upconversion and digital to analog conversion, generating the analog signal for transmission over the antenna.