Link Performance Abstraction for ML Receivers based on RBIR Metrics
AssigneeIntel Corporation
InventorsHongming Zheng, Wu Mav, Yang-seok Choi, Senjie Zhang
Life of this patent
Estimating the term…
Abstract
A PHY abstraction mapping between the link level and system level performance is presented based on mapping between the mean RBIR (Received Bit Information Rate) of the transmitted symbols and their received LLR values after symbol-level ML detection in SISO/MIMO wireless systems, such as WiMAX. In MIMO antenna configuration, the mapping is presented for both vertical and horizontal encoding. An embodiment of this invention provides the PER/BLER prediction in the actual system, enabling the system to use more aggressive methods to improve the system performance.
Claims19
A method for link performance abstraction under maximum likelihood receivers, said method comprising:
- determining a symbol-level log-likelihood-ratio distribution based on a channel matrix and a signal-to-noise ratio, for a symbol of multiple symbols and a subcarrier of one or more subcarriers;
- determining a received bit information rate for said subcarrier based on said symbol-level log-likelihood-ratio distribution;
- calculating a mean received bit information rate over said multiple symbols and said one or more subcarriers, and storing said mean received bit information rate in a memory location;
- and
- determining a block error rate based on said mean received bit information rate and a code rate.
A method as recited in claim 7, wherein parameters of said normal distribution are determined by numerical approximation or by using a lookup table.
A method as recited in claim 7, wherein one or more parameters of said normal distribution is adjusted by an adjustment factor.
A method for link performance abstraction under maximum likelihood receivers, said method comprising:
- determining a symbol-level log-likelihood-ratio distribution based on a channel matrix and a signal-to-noise ratio, for a symbol of multiple symbols and a subcarrier of one or more subcarriers, and based on an approximation of said symbol-level log-likelihood-ratio distribution with a normal distribution for a sender antenna stream;
- determining a received bit information rate for said subcarrier based on said symbol-level log-likelihood-ratio distribution by using one or more of the following techniques:
- numerical approximation, using a lookup table, or using a simplified approximate form;
- calculating a mean received bit information rate over said multiple symbols and said one or more subcarriers, and storing said mean received bit information rate in a memory location;
- and
- determining a block error rate based on said mean received bit information rate and a code rate.
Dependencies are inferred from the claim text.