Design And Implementation Of Baseband Based On 2.4GHz Wireless Communication

With the widespread application and development of 2.4G wireless technology in society,various wearable devices and consumer electronic peripherals have gradually become popular in our lives,and the Internet of Things has also spread throughout all aspects of our lives.At the same time,people's needs are becoming more and more diversified,and there are more personalized and applicable Io T requirements for various application scenarios.Among them,the demand for competitive wireless keyboards and mice used in special scenarios for e-sports games is one of them.This article mainly studies the baseband system in the competitive wireless keyboard and mouse,and designs and implements the baseband system based on 2.4G private communication protocol.This article focuses on the research of 2.4G private protocol baseband system,and analyzes the 2.4GHz private communication protocol specification,APB3.0 bus protocol,the working principle and specific design implementation of 2.4GHz baseband system.First,the overall architecture of the 2.4G baseband system is studied,and the system is determined to be divided into four module designs:data processing,memory,clock,and I/O interface.Secondly,it studies the core of the baseband system,the data processing module.This module is composed of a sending data module and a receiving data module,and mainly realizes the sending and receiving process of the bit stream.The sending process includes framing,CRC and whitening,and the receiving process includes de-whitening,frame analysis and CRC checking.At the same time,it also needs to realize functions such as switching between receiving and sending modes and automatic response retransmission.Finally,the design of the memory,interface circuit and clock circuit in the baseband is studied.The memory includes registers and FIFOs.The registers realize the control of the baseband system,and the FIFO stores the data to be sent and the data received.The interface circuit mainly realizes the communication between the MCU and the baseband system and the data communication between the baseband system and the RF.The clock circuit provides the required working clock for the entire baseband.Finally,on the basis of the above-mentioned 2.4G baseband system design and implementation,it is integrated into a complete SOC for simulation,synthesis and FPGA verification to ensure the correctness and feasibility of the design.On the basis of the above research,the function of the baseband system was verified through VCS software simulation and FPGA hardware test.The results show that when the system uses a clock frequency of 24MHz,the data stream processed per second can reach2Mbps.Compared with other series of standard products,the advantages and innovative work of the design of this article are mainly reflected in three aspects:(1)Compared with the Bluetooth standard,the protocol standard of this article is flexible and simple,which reduces the area of the system.The comprehensive results show that the total area of the baseband system is 104080.48)~2,which is only equivalent to 1/4 of the area of the baseband system under the Bluetooth standard;(2)The protocol can be freely customized according to the special requirements of competitive-grade keyboards and mice.With a delay of about 1ms,the return rate of the competitive mouse and keyboard based on this system can reach 1000Hz,which can fully meet the demand for highly sensitive keyboard and mouse in special scenes.However,due to the limitation of the protocol itself,the return rate of Bluetooth standard products can only reach 133Hz.(3)In the design of the baseband core data processing module,the CRC circuit,packet unpacking circuit and whitening processing circuit are optimized through the method of logic multiplexing,which effectively reduces the area of the baseband system.