Design And Implementation Of The Software About Multi-standard Broadband Communicational Signal Simulational System

With the rapid development of wireless broadband communicational technology, we need a variety of formats to meet the needs of broadband communicational signal engineering. In order to simulate signal generation and signal modulation,we need to study a new method for simulation analysis. We need to use software to simulate multi-standard broadband communicational systems in this thesis.In this thesis, we use software to simulate the multi-standard broadband communicational systems’ s signal generation and signal modulation, and we need to complete the baseband signal storage and retrieval with database and achieve the software to send data to hardware. The user can achieve the verification and analysis of signals directly avoiding the use of other measuring instruments in the upper layer software. Contents of this thesis include the following:1, Creating a graphical user interface. The software sets up MFC framework and puts up multiple classes to implement software function to create a visual interface to meet the user’s requirements.2, The signal simulation of the multi-standard broadband communicational systems. This section includes two aspects, one way is to use software to process the simulation of baseband signal. This section includes generating PN code, symbol mapping,quadrature modulation and shaping filtering.The spftware uses the maximum length linear shift register to generate the corresponding order of the PN code. According to the modulation method on the graphical interface, the symbol sequence is mapped according to the bit sequence to constitute a certain minimum mapping unit. Shaping filter is based on the time-domain response of the filter,there are three types of filters,such as gaussian, raised cosine and root raised cosine filter.Then we can get two baseband signal. Another aspect is the completion of third-party data import, third-party data validation and analysis. These two parts are two innovations of this thesis.3, The achievement of signal modulation in multi-standard broadband communicational system.The software achieve more than 10 kinds of quadrature modulation including FSK, PSK and QAM. The software introduce graphical analysis module, using constellation graph, vector graph, time domin graph and spectrum domain graph to analysis the signal character of broadband communication signals, to avoide the using of other measurement tools.4, The simulation of gaussian channel. The simulation software system add a gaussian channel model to simulate gaussian white noise in the actual environment.The software superimposed gaussian decline factor to baseband signal sequences.5, Creating interactive interface and system debugging and test.The dynamic link library in the simulation software encapsulates the interactive interface between software and hardware platform to achieve the communication.we need to test the system.This thesis has finished the test and analysis about the function and performance of the software,and the software has been validated.