CAZAC Sequence Phase Offset for Carrier Aggregation PAPR Reduction

The patent applies local quality by making the reference signal sequences different for each component carrier while maintaining a common base sequence. Specifically, each component carrier uses the same base CAZAC sequence but applies different cyclic shifts or phase offsets to generate carrier-specific reference signals. This allows resource allocation efficiency to be maintained through the common base sequence while reducing PAPR through the local differentiation, resolving the contradiction between resource allocation efficiency and PAPR reduction.

The patent applies parameter changes by modifying the reference signal sequences across component carriers through different cyclic shifts or phase offsets. Instead of using identical sequences that cause coherent addition and high PAPR, the system changes the temporal or phase parameters of the sequences for each carrier. This allows carrier aggregation to achieve higher communication speeds while the parameter differentiation prevents coherent addition, thereby reducing PAPR and resolving the contradiction between communication speed and PAPR.

The patent resolves this contradiction by applying local quality - using a common base signal sequence across multiple carriers to maintain low system complexity, while introducing local variations through carrier-specific cyclic shifts or phase offsets. This approach keeps the system simple by reusing the same base sequence generation logic, yet prevents coherent addition by making the actual transmitted sequences different for each carrier, thereby reducing PAPR without significantly increasing system complexity.