Zero-Correlation-Zone Sequences for Wireless PHY Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing training sequences in IEEE 802.11ad specifications are not efficient for detecting the physical layer (PHY) type in wireless communication systems, as they lack a zero-correlation zone greater than one, which affects channel estimation and signal detection performance, especially in channels with multiple delayed taps.
Innovation Solution
The use of Zero-Correlation-Zone (ZCZ) Concatenated Complementary Pair (CCP) sequences, which have a zero correlation zone greater than one, are introduced to improve channel estimation and PHY type detection by generating sequences with specific auto-correlation and cross-correlation properties, allowing for better signal detection and channel impulse response estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional training sequences (Golay complementary sequences) are used for channel estimation, then channel estimation can be performed, but the sequences lack a zero-correlation zone greater than one, making PHY type detection inefficient
Solution Approach 1:
The training sequence is segmented into multiple parts: a prefix sequence, a middle sequence composed of concatenated complementary sequences, and a postfix sequence. The middle sequence is further divided into N concatenated complementary sequences, each of length L. This segmentation allows the zero-correlation zone property to be achieved in the middle sequence while maintaining compatibility with existing channel estimation procedures using the prefix and postfix sequences.
Solution Approach 2:
The training sequence is constructed as a composite structure combining different sequence types with specific properties. The prefix and postfix sequences provide channel estimation capability, while the middle sequence composed of concatenated complementary sequences provides the zero-correlation zone property for PHY type detection. This composite structure allows both functions to coexist without interfering with each other.
2Reliability
If training sequences are designed for efficient channel estimation, then channel estimation performance is optimized, but the sequences do not provide sufficient zero-correlation zone for effective PHY type detection
Solution Approach 1:
The training sequence is designed to serve multiple functions simultaneously. The prefix and postfix sequences enable channel estimation, while the middle sequence with concatenated complementary sequences enables PHY type detection through its zero-correlation zone property. This multi-functional design allows a single training sequence to satisfy both channel estimation and PHY type detection requirements without requiring separate sequences for each function.
3Device complexity
If the training sequence structure is simplified for ease of implementation, then device complexity is reduced, but the zero-correlation zone property required for PHY type detection is lost
Solution Approach 1:
Different parts of the training sequence are assigned different properties tailored to their specific functions. The prefix and postfix sequences have properties optimized for channel estimation, while the middle sequence has properties optimized for PHY type detection (zero-correlation zone). This local differentiation allows each part to be simple and effective for its intended purpose while the overall structure achieves both goals.
Data Source
AI summary
The present disclosure provides for the construction and use of a set of Zero-Correlation-Zone (ZCZ) Concatenated Complementary Pair (CCP) sequences with zero-correlation-zone range greater than one or with zero-correlation-zone range equal to one and the sequence set size greater than two. Complementary pair sequences A and B are selected and, for each member of the set of ZCZ CCP sequences, sign sequences pA and pB are combined with the complementary pair sequences to form a member ZCZ CCP sequence of the set. A ZCZ CCP sequence modified by propagation over a communication channel may be identified by cross-correlation with ZCZ CCP sequences of the set. A set of sign sequences may be constructed by recursive expansion from an initial set or found by a computer search. The sequences may be used in a transceiver of a portable electronic device or other communication device.