Differential Space-Time Block Coding Interference Mitigation
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Solution Overview
Problem
In wireless communication systems using differential space-time block coding, mobile stations cannot perform interference mitigation processing due to the lack of transmission path estimation, leading to degradation in received signal quality caused by interference signals from adjacent base stations transmitting at the same frequency.
Innovation Solution
A transmission device that performs space-time block coding, differential operations, and code multiplication on transmission blocks, allowing the selection and transmission of specific blocks to mitigate interference, enabling the mobile station to estimate and remove interference signals without requiring explicit transmission path estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If differential space-time block coding is used to eliminate the need for transmission path estimation, then device complexity is reduced, but interference mitigation processing becomes unavailable
Solution Approach 1:
The patent introduces a preamble sequence that is transmitted before the actual data signal. This preamble contains known signal characteristics that enable the mobile station to perform transmission path estimation in advance, preparing the necessary information for subsequent interference mitigation processing without adding complexity to the main data transmission.
Solution Approach 2:
The patent uses a preamble sequence as an intermediary element that bridges the gap between signal transmission and interference mitigation. The preamble acts as a mediator that provides the mobile station with the information needed to estimate transmission paths and mitigate interference, without requiring continuous estimation during data transmission.
2Area of stationary object
If multiple base stations transmit at the same frequency to cover overlapping communication areas, then service coverage is improved, but interference signals degrade received signal quality
Solution Approach 1:
The patent converts the harmful interference signals from adjacent base stations into useful information for interference mitigation. By using the preamble sequences transmitted by interfering base stations, the mobile station can estimate the interference characteristics and subtract them from the received signal, turning the previously harmful interference into a manageable and even useful reference for signal processing.
3Reliability
If transmission path estimation is performed to enable interference mitigation, then interference mitigation processing becomes available, but device complexity increases
Solution Approach 1:
The patent performs transmission path estimation in advance using the preamble sequence before the actual data transmission begins. This preliminary action allows the mobile station to prepare the necessary estimation data without adding ongoing complexity during the main data reception process, as the estimation is completed beforehand using dedicated preamble time.
Data Source
AI summary
A base station, which is a transmission device according to the present invention, includes a space-time block coding unit that performs space-time block coding on a transmission symbol to generate a transmission block, a differential unit that performs a differential operation on the transmission block, a code multiplication unit that multiplies the transmission block by a code, a selection unit that selects one of the transmission block after the differential operation and the transmission block after the code multiplication, and wireless transmission units that transmit the transmission block selected.