Multi-band Communication System Adaptive Channel Coding
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Solution Overview
Problem
Conventional multi-band communication systems, such as WiMedia UWB MB-OFDM, face limitations in data transfer rates and inefficient link and channel adaptation due to uncorrelated sub-bands with varying pass losses, making it difficult to support higher data rates like 1 Gbps and above.
Innovation Solution
A multi-band communication system employing parallel encoding and decoding techniques, where each sub-band has its own channel encoder and decoder, and a multiplexer/demultiplexer to ensure all symbols of a data stream are transmitted in the same sub-band, allowing for adaptive modulation and coding based on channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional BICM technique is used in multi-band communication system, then frequency selective fading is overcome, but data rate is limited to 480 Mbps
Solution Approach 1:
The patent divides the single data stream into multiple parallel sub-streams, each processed by separate channel encoders and decoded by separate channel decoders operating in parallel. This segmentation of the encoding/decoding process enables the system to achieve data rates of 1 Gbps and above by performing multiple encoding/decoding operations simultaneously rather than sequentially.
2Adaptability or versatility
If single channel encoder/decoder is used, then device complexity is reduced, but link and channel adaptation efficiency deteriorates due to uncorrelated sub-bands with varying pass losses
Solution Approach 1:
The patent assigns different channel encoding parameters (such as coding rates, modulation schemes, or error correction codes) to different sub-streams corresponding to different sub-bands. This allows each sub-stream to be optimized for its specific channel conditions, with channel encoders and decoders configured to match the local characteristics of their respective sub-bands, thereby improving link and channel adaptation efficiency.
Data Source
AI summary
A multi-band communication system includes a plurality of transmit channels, where each transmit channel transmits data streams through a single sub-band, and a plurality of receive channels, where each receive channel receives data streams of a single sub-band. According to one embodiment of the invention, each transmit channel and its respective receive channel are configured with a different set of channel codes to encode and decode the data. The set of channel codes is determined by an adaptive modulation coding controller based on a condition of the link between a transmit channel and a receive channel.