Multiple Transmit Antenna Interleaver Design for Burst Error Handling
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Solution Overview
Problem
Conventional wireless communication systems, such as those using IEEE 802.11a/g, do not effectively utilize both frequency and time dimensions for error correction, leading to inefficiencies in handling correlated errors in channels, especially in burst error scenarios, due to their design limitations.
Innovation Solution
A system and method for interleaving data across multiple transmit antennas, employing a combination of interleavers and bit-to-stream allocators that perform specific permutations and mappings to spread data bits across subcarriers and transmit streams, adhering to IEEE 802.11a/g standards, to achieve improved error protection and immunity to transmission impairments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional interleaving methods are used that only exploit the frequency dimension, then the system maintains simple receiver design and low computational complexity, but the system cannot effectively handle correlated errors and burst errors in the time dimension
Solution Approach 1:
The patent extends the interleaving approach from one dimension (frequency only) to two dimensions (frequency and time) by introducing time-domain interleaving across multiple transmit antennas. This dimensional extension allows the system to spread errors both across frequency subcarriers and across time instances, thereby handling correlated and burst errors more effectively without requiring complex receiver designs
2Reliability
If an interleaver that exploits both frequency and time dimensions is designed, then the system can improve error protection by spreading errors across time and frequency, but the system introduces inherent delay and increased complexity
Solution Approach 1:
The patent segments the data stream into multiple parallel paths corresponding to different transmit antennas and frequency subcarriers. By processing multiple segments simultaneously in parallel rather than sequentially, the system achieves time-domain diversity without introducing excessive delay, as the segmented processing occurs concurrently across the MIMO channel
3Reliability
If multiple transmit antennas are used with interleaving, then the system achieves better error protection and performance in MIMO configurations, but the system increases device complexity and processing requirements
Solution Approach 1:
The patent designs a universal interleaving structure that simultaneously performs multiple functions: frequency-domain interleaving, time-domain interleaving, and spatial distribution across multiple transmit antennas. This multi-functional approach achieves diverse error protection without requiring separate dedicated components for each function, thereby managing complexity while improving reliability
Data Source
AI summary
An arrangement of interleavers allocates bits from an input symbol across sub-symbols transmitted via sub-carriers of multiple orthogonal frequency division multiplex (OFDM) carriers. The input bits are allocated in a fashion to provide separation across subcarriers, and rotation of sub-symbols across the OFDM carriers provides additional robustness in the present of signal path impairments.