OFDM Stream Transfer Using Coefficient Merging for Single-Antenna Reception
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Solution Overview
Problem
Terrestrial receivers struggle to decode streams when the signal-to-noise ratio from terrestrial sources using MIMO techniques is poor, and satellite sources with a single antenna cannot perform MIMO, leading to incomplete stream reception.
Innovation Solution
A method and device that demultiplex and manipulate Orthogonal Frequency Division Multiplex symbols from multiple streams using different coefficients, allowing for the formation of improved OFDM symbols that can be transmitted even with a single antenna, enabling reception even when signal-to-noise ratios are low.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a satellite or terrestrial source uses only one transmit antenna, then device complexity is reduced, but the ability to perform MIMO technique and maintain reliable stream reception deteriorates
Solution Approach 1:
The patent merges multiple streams into a single stream by multiplying each stream by different coefficients and summing them. This allows a single-antenna source to transmit multiple streams that can be separated at the receiver, achieving MIMO-like reliability without multiple transmit antennas.
Solution Approach 2:
The single transmit antenna is made multi-functional by transmitting multiple encoded streams simultaneously. The antenna serves multiple purposes: transmitting stream 1, stream 2, and other streams through coefficient multiplication and summation, eliminating the need for multiple dedicated antennas.
2Reliability
If terrestrial sources use MIMO technique with multiple antennas, then stream reception reliability is improved, but device complexity and cost increase
Solution Approach 1:
Multiple streams are combined into a single transmitted signal through coefficient multiplication and summation. This merging process allows the system to achieve diverse stream transmission with a single antenna, avoiding the complexity of multiple antennas while maintaining reception reliability.
Solution Approach 2:
The patent changes the parameter of stream transmission by introducing different multiplication coefficients for different streams. This parameter transformation allows a single antenna to effectively transmit multiple independent streams that can be distinguished at the receiver through their unique coefficient signatures.
3Area of stationary object
If satellite coverage area is increased to reach areas with poor terrestrial signal, then coverage area is improved, but the single-antenna limitation prevents MIMO and reduces stream decoding ability
Solution Approach 1:
The satellite's single antenna is made universal by enabling it to transmit multiple streams through coefficient-based encoding. This allows the satellite to provide comprehensive stream coverage in areas where terrestrial MIMO signals are unavailable, maintaining decoding ability despite the single-antenna constraint.
Solution Approach 2:
Multiple streams are merged into a single transmission signal that can be broadcast from the satellite's single antenna. This merging enables the satellite to deliver multiple independent streams to remote areas, achieving both expanded coverage and maintained stream decoding capability.
Data Source
AI summary
A method and device for transferring OFDM symbols representative of at least a first and a second stream from a source including a first number of antenna to at least one receiver. The source demultiplexes the first stream to extract at least one first pilot sequence and first data and the second stream to extract at least one second pilot sequence and second data, multiplies the at least one first pilot sequence and first data by a first coefficient, the at least one second pilot sequence and second data by a second coefficient different from the first coefficient, sums first multiplied data and second multiplied data, multiplexes the sum, the at least one first and second multiplied pilot sequences to form the OFDM symbols, and transfers the OFDM symbols.