UWB LDPC Codeword Length Selection for Higher Data Rates
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Solution Overview
Problem
UWB communication systems face limitations in data rates due to basic coding designs, which hinder their effectiveness in close-range data communication applications.
Innovation Solution
Implementing a low-density parity-check (LDPC) encoding scheme with selectable codeword lengths of 648, 1296, and 1944 bits to optimize data transmission and reception, allowing for improved data rates and reduced overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a basic coding design is used in UWB, then the system complexity is reduced, but the data rate is limited
Solution Approach 1:
The patent implements dynamic codeword length selection where the LDPC encoder can choose from multiple codeword lengths (648, 1296, or 1944 bits) based on the payload size. This dynamic adaptation allows the system to optimize between overhead and data rate for different communication scenarios, resolving the contradiction between simple coding design and high data rate requirements.
Solution Approach 2:
The patent changes the parameter of codeword length from fixed to variable, allowing selection among 648, 1296, and 1944 bit codewords. This parameter change enables the system to achieve higher effective data rates by selecting appropriate codeword lengths based on payload requirements, while maintaining the underlying simple LDPC coding structure.
2Productivity
If longer codeword lengths are used in LDPC encoding, then the data rate increases, but the overhead increases
Solution Approach 1:
The system dynamically selects codeword length based on payload size: using 648-bit codewords for small payloads to minimize overhead, 1296-bit codewords for medium payloads, and 1944-bit codewords for large payloads to maximize data rate. This dynamic selection resolves the contradiction by adapting overhead to actual needs.
Solution Approach 2:
By changing the codeword length parameter based on payload requirements, the system optimizes the ratio of data bits to overhead bits. For example, using 1944-bit codewords for large payloads achieves higher effective data rates compared to using fixed shorter codewords, while avoiding unnecessary overhead for small payloads.
Data Source
AI summary
In some implementations, a transmitting UWB device may determine a number of information bits of a payload to communicate via UWB. The transmitting UWB device may select, based on the number of information bits, a codeword length from a selection of available codeword lengths with which to encode the payload using a low-density parity-check (LDPC) encoding scheme, wherein the selection of available codeword lengths include a first codeword length, a second codeword length, and a third codeword length, wherein the third codeword length is longer than the second codeword length, which is longer than the first codeword length. The transmitting UWB device may transmit the payload using one or more codewords having the selected codeword length.