1. It depends on the comprehensive articles in the research field and has a general understanding of the development and technology of the whole research direction. Find out what you want to do. 2. It depends on the original papers in the research field, that is, the most classic and cited papers. Viewpoint: We should seriously study the classic original algorithm and system model, deduce the algorithm and imitate the simulation. Write down the shortcomings of the algorithm. 3. It depends on the papers that quote classic papers. Opinion: 1. Read the abstract, preface and conclusion, see what improvements have been made to the classic papers, and summarize the improvement methods, advantages and disadvantages. 4. It depends on the latest research papers: the same as 35. Using the same algorithm in different models depends on the paper, such as beamforming LMS algorithm used in OFDM and CDMA systems, and using different algorithms in OFDM systems depends on the paper, such as beamforming using LMS algorithm and RLS algorithm. After completing the above steps, the opening report is considered completed. To sum up the above, the algorithms in each branch are classified and summarized. Then preliminarily determine your own direction: 1. Do you want to be blind, semi-blind or non-blind 3. Which paper needs to be improved? 4. Another paper is improved by method A in another model. Can you improve 4 papers by method A? 1. Find the literature review in this research field. This step is very important. It is sometimes not easy to find an influential summary (I mainly look at the number of quotations). You can ask your brothers and sisters. I found a foreign language review directly in SpingerLink, and the number of citations was as high as 120. It should be noted here that the number of citations can be checked through google or on the science website, but if possible, it is best to use the latter. According to experience, the number of quotations found by the former is often inaccurate. 2. Intensive reading of this literature review. This step is mainly to understand the framework of the research field, be familiar with the keywords and predicates of each question, and summarize and classify them. 3. Search according to the author of the review, the cited literature and the cited situation. The author who wrote this document is generally a leader in this research field, so his documents are generally of high reference value. You can directly search the relevant literature of this author, and then use the question keywords for secondary retrieval. Look for articles that quote this comment (I usually look it up on the Science Web, or I can use Google). The articles found in this step are often relatively new and can represent the latest research trends. Find the literature cited in the comments (also available on the Science Network). In the process of development, the author of literature retrieval, the citation of literature and the cited situation are intertwined. But not all documents need to be searched in this way, mainly for those documents with high citation times, because if every document is searched in this way, the workload will be great and unnecessary. 4. In the process of reading literature, it is necessary to combine intensive reading with extensive reading, and take notes at the same time. I suggest that when you read a document, open a word document, sort out the wonderful and important parts of the article, then copy it, mark the title and author of the document, and group each kind of document into one group. The method is simple to operate, and it will be very helpful when you want to inquire and repeat in the future, especially when you write an article, the relevant literature and its highlights can be seen at a glance. This method has been accumulated for a long time and is of great help to improve writing and reading. In addition, I sometimes translate some classic paragraphs or sentences into Chinese and put them in my notebook. This will not only save the trouble and time of writing articles in the future, but also sharpen the ability of English-Chinese translation, which is very beneficial to your oral expression when communicating with foreigners in the future.