Method and system for LLR buffer reduction in a wireless communication modem

摘要

A system involves a transmitting device (for example, a first wireless communication device) and a receiving device (for example, a second wireless communication device). In the receiving device, LLR (Log-Likelihood Ratio) values are stored into an LLR buffer. LLR bit width is adjusted as a function of packet size of an incoming transmission to reduce the LLR buffer size required and/or to prevent LLR buffer capacity from being exceeded. The receiver may use a higher performance demodulator in order to maintain performance despite smaller LLR bit width. In the transmitting device, encoder code rate is adjusted as a function of receiver LLR buffer capacity and packet size of the outgoing transmission such that receiver LLR buffer capacity is not exceeded. Any combination of receiver LLR bit width adjustment, demodulator selection, and encoder code rate adjustment can be practiced to reduce LLR buffer size required while maintaining performance.

主权项

1. A system comprising a receiver and a transmitter, comprising:
an encoding circuit, wherein the encoding circuit has a code rate; and a processing circuit configured to use Log-Likelihood Ratio information to control the encoding circuit such that the code rate is changed, wherein the Log-Likelihood Ratio information corresponds to the receiver and comprises Log-Likelihood Ratio buffer capacity information and other information identifying a plurality of Log-Likelihood Ratio bit widths selectable by the receiver based on the Log-Likelihood Ratio buffer capacity information, wherein the processing circuit changes the code rate when it is determined that encoded data transmitted by the transmitter causes a Log-likelihood Ratio buffer storage capacity to be exceeded, and wherein the code rate is not changed when it is determined that the Log-Likelihood Ratio buffer storage capacity will not be exceeded.