Wireless Transmission Precoding for Outage Capacity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional MIMO systems face challenges in increasing outage capacity due to limitations in the number of multiple paths and receiving power, leading to inefficient use of transmission power and failure to meet desired packet error rates.
Innovation Solution
A radio transmission apparatus and precoding method that determine the number of spatial multiplexing streams based on desired multiple paths, receiving antenna ports, and error rates, calculating transmission weights for precoding to optimize data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of multiple paths is increased to increase the number of multiplexed streams according to equation (2), then the outage capacity can be increased, but the receiving power per path becomes smaller, making it difficult to satisfy the desired packet error rate
Solution Approach 1:
The invention changes the parameter of multiple path quantity from a fixed detected value to a controllable variable. By adjusting the multiple path quantity parameter L based on receiving power conditions, the system can optimize the balance between outage capacity and packet error rate. When receiving power is sufficient, L is set to maximize streams; when receiving power is insufficient, L is reduced to maintain error rate requirements.
2Reliability
If the number of multiple paths is small and receiving power per path is large, then the packet error rate can be satisfied, but the number of multiplexed streams is limited, preventing outage capacity increase
Solution Approach 1:
The invention makes the multiple path quantity L dynamic rather than fixed. The determining section adjusts L based on real-time receiving power conditions and desired error rates. This dynamic adjustment allows the system to transition between different operating modes: when receiving power is high, L is increased to maximize throughput; when receiving power is low, L is decreased to maintain reliability, thus resolving the contradiction between reliability and productivity.
3Productivity
If transmission power is distributed to more multiple paths, then more streams can be multiplexed, but the receiving power per path decreases, leading to inefficient use of transmission power
Solution Approach 1:
The invention introduces feedback mechanisms where the determining section monitors receiving power conditions and desired error rates, then adjusts the multiple path quantity L accordingly. This feedback loop ensures that transmission power is distributed efficiently: when receiving power is sufficient, more paths are utilized to increase streams; when receiving power is insufficient, fewer paths are used to maintain power efficiency and meet error rate requirements, thus optimizing transmission power utilization.
Data Source
AI summary
A wireless transmission apparatus able to reliably increase outage capacity according to the state of a propagation path. This apparatus is a wireless transmission apparatus (100) which transmits a plurality of streams to a wireless reception apparatus; wherein a time/space allocation determining unit (107) determines the spatial multiplex stream number based on the desired multipath number and the number of reception antenna ports of the wireless reception apparatus, said desired multipath number being calculated based on the detected multipath number, the number of reception antenna ports, and the desired error rate for the plurality of streams; a stream dividing unit (109) divides the transmission data into a plurality of streams of that spatial multiplex stream number; a transmission weight calculation unit (108) calculates a transmission weight based on the desired multipath number, spatial multiplex stream number, and a channel estimation value; and a time precoding unit (1103) and a spatial precoding unit (111) use the transmission weight to precode the plurality of streams.