The Design And Optimization Of 802.11ax Software Baseband Transmitter

In recent years,wireless communication has developed rapidly with the huge increament of the communication device,and the number of users has also increased exponentially.In order to adapt to this situation,IEEE's TGax group was established in 2013,they will modify and design the 802.11 ax protocol,and it will be finished in 2019.In order to satisfy the demand for high rate of communication,we will use the latest research findings of 802.11 ax and C language to achieve a high speed communication baseband transmitter based on DPDK(Data Plane Development Kit)environment,this kit is developed by Intel in order to handle the fast packet processing.Software baseband transmitter uses C language to complete,and it has the following advanteages compared to the implementation of hardware.First of all,it is easy to realize,and can be developed in a shorter time.Secondly,it is more suitable for muti-user environment and easy to be expanded.Moreover,software realization is more flexible,and it can be able to meet all kinds or needs,such as protocol changes.Finally,in the Linux environment,we can use the DPDK technology to improve the throughput of the transmitter greatly.Another key point of the soft baseband is the early cancellation of the interference.The system collects the channel information to calculate the precoding matrix and multiplies the signal at the transmitter.It can not eliminate the interference,but also improves the performance of the MIMO(Multiple Input Multiple Output)detection.This paper mainly has the following contributions.Firstly,through the study of each module,the implementation difficulty and the main factors of restricting calculation speed is clear,and we know the direction of calculating optimization and conceptual design.Secondly,we optimize the calculating speed of each module,and it improves the performance of transmitter greatly.Thirdly,we design two system implementation architecture based on DPDK and analyze both advanteges and disadvanteges.At last,we implement two projects and select the final system plan according to the test results.This paper is helpful for the verification and improvement of 802.11ax's current results,and also helpful for the production of related products,so that it has important practical significance.