Pilot-Aided SCBT Blocks for Frequency and Phase Error Tracking
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Solution Overview
Problem
Conventional packet structures are inefficient for high-frequency communication systems like 60 GHz due to inadequate frequency error estimation, requiring long preambles that result in poor performance and inefficiency.
Innovation Solution
A single-carrier modulation scheme using cyclically orthogonal constant amplitude pilot signals at the beginning or end of SCBT blocks to improve residual frequency error and phase noise estimation, reducing the need for long preambles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional packet structures with preambles are used in high-frequency communication systems, then frequency error estimation can be performed, but the estimation accuracy is inadequate and requires very long preambles resulting in poor system efficiency
Solution Approach 1:
The patent segments the packet structure into multiple SCBT blocks, each containing pilot signals at the beginning or end. This segmentation allows frequency error estimation to be performed on each block independently, achieving accurate estimation without requiring a single long preamble, thus resolving the contradiction between measurement precision and productivity
Solution Approach 2:
The patent inserts known pilot signals at the beginning or end of each SCBT block before the data transmission. This preliminary action provides reference signals that enable accurate frequency error estimation without requiring long preambles, as the pilot signals are distributed throughout the packet structure rather than concentrated at the beginning
2Measurement precision
If very long preambles are used at the beginning of packets to achieve good frequency estimation accuracy in high-frequency systems, then frequency estimation accuracy improves, but system efficiency deteriorates due to increased overhead
Solution Approach 1:
The patent divides the packet into multiple SCBT blocks with pilot signals distributed across them. This segmentation replaces the single long preamble with multiple shorter pilot sequences, reducing total overhead while maintaining frequency estimation accuracy through cumulative information from multiple blocks
Solution Approach 2:
The patent employs periodic insertion of pilot signals at regular intervals (beginning or end of each SCBT block). This periodic structure provides multiple opportunities for frequency error estimation without requiring continuous long preambles, thereby reducing time loss while maintaining estimation precision
Data Source
AI summary
A single carrier modulation scheme suitable for use in high frequency communication systems is provided that achieves improved residual frequency error and phase noise estimation. At a transmitter, cyclically orthogonal constant amplitude pilot signals are inserted at the beginning (or end) of a plurality of SCBT blocks of a block coded data stream. At a receiver, a phase rotation of the received data stream is determined to remove a residual frequency error or to estimate the phase noise.