Rateless Code Wireless Multicast for Heterogeneous Antennas
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Solution Overview
Problem
Conventional wireless multicast schemes struggle to efficiently transmit data to heterogeneous receivers with varying antenna capabilities and channel conditions, leading to suboptimal video multicast capacity and energy efficiency, as they often sacrifice receivers with superior antennas and require excessive channel probing and conservative operating points.
Innovation Solution
The implementation of rateless coding at the physical layer for wireless multicast, which encodes data into coded frames that are agnostic to the number of antennas used by receivers, allowing for successful transmission without specific configuration based on antenna capabilities, and enables receivers to adjust peak signal-to-noise ratio to match their channel state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional wireless multicast schemes customize PHY frames to the number and capability of receiver antennas, then successful data communication is facilitated, but receivers with superior antennas are penalized and video multicast capacity is reduced
Solution Approach 1:
The patent applies universality by designing a rateless coding system that functions effectively across all receiver types regardless of antenna count or capability. The transmitter sends encoded packets that can be successfully decoded by any receiver with sufficient packets, making the system universally compatible with heterogeneous devices without requiring customization for each receiver type.
Solution Approach 2:
The patent changes the fundamental parameter of transmission from fixed-rate coded frames to rateless coded packets. This allows the system to adapt to different channel conditions and receiver capabilities by varying the number of packets transmitted rather than varying the PHY frame structure, thereby maximizing multicast capacity while maintaining compatibility with all receivers.
2Reliability
If conventional schemes use conservative operating points to accommodate receivers with inferior antennas, then all receivers can successfully receive data, but energy efficiency is reduced and superior antenna capabilities are wasted
Solution Approach 1:
The patent introduces dynamics through the rateless coding mechanism where the transmission continues until successful acknowledgment from all receivers. The system dynamically adapts to each receiver's actual channel conditions and antenna capabilities in real-time, allowing receivers with superior antennas to operate at higher effective rates while ensuring all receivers achieve successful reception.
Solution Approach 2:
The patent implements feedback through acknowledgment mechanisms where receivers signal successful packet reception. This feedback allows the transmitter to optimize transmission based on actual receiver performance, enabling energy-efficient operation by stopping transmission once all receivers have successfully received the required data without forcing conservative rates on all users.
3Productivity
If conventional schemes require channel probing and specific configuration based on antenna capabilities, then transmission can be optimized for each receiver, but device complexity and overhead increase
Solution Approach 1:
The patent applies self-service by enabling each receiver to independently decode data from the rateless coded packets based on its own channel conditions and antenna capabilities without requiring complex transmitter configuration or extensive channel probing. The receivers autonomously determine when they have successfully received sufficient packets to decode the original data.
Data Source
AI summary
Data is transmitted over a wireless network by encoding data using a rateless code. A multi-cast signal is wirelessly transmitted to communicate the encoded data for any one or more receivers. The wireless transmission is performed in a manner that is agnostic as to a number of antennas that are utilized by each of the one or more receivers.