Block Diagram Of A Communication System Computer Science Essay

Block Diagram Of A Communication System Computer Science Essay The doorway to the nowadays wireless communication systems was opened by Guglielmo Marconi when he transmitted the three-dot Morse code for alphabet ‘ S ‘ by the use of electromagnetic waves over a 3-KM link in 1895. This laid the foundation of modern communication systems ranging from broadcasting, satellite transmission and radio eventually progressing to nowadays cell phones. It wouldn’t be wrong to say that wireless communication has indeed revolutionized our present society A sudden increase has been observed in the expansion of radio systems during the last two decades. We have seen great evolution in Wireless communication systems from 1G narrowband analog systems in the 1980s to the 2G narrowband digital systems in the 1990s. Now the existing 3G wideband multimedia systems are being deployed. In the meantime, research and progress in the future-generation wideband multimedia radio systems is vigorously being pursued worldwide. To connect mobile users to th e public switched network the United States introduced first radiotelephone service by the end of the 1940s. Improved Mobile Telephone Service was launched by Bell Systems in 1960s due to which lots of improvements like direct dialing and increase in bandwidth took place. IMTS formed the bases of the first analog cellular systems. The term cellular was used due to the fact that coverage areas were split cells, they had a low power transmitter and receiver. BLOCK DIAGRAM OF A COMMUNICATION SYSTEM Figure 1. Block diagram of a general communication system. ANALOG vs. DIGITAL COMMUNICATION SYSTEMS Definition of Digital A method of storing, processing and transmitting information through the use of distinct electronic or optical pulses that represent the binary digits 0 and 1. Advantages of Digital low-priced reliable Easy to manipulate Flexible Compatible with other digital systems The information in digital form can only be transmitted without any degradation through a noisy channel In corporated networks Disadvantages of Digital Sampling Error As compared to analogue, larger bandwidth is required in digital communications for the transmission of the same information. Synchronization in the communications system is required to recognize the digital signals, but this is not the case with analogue systems. Definition of Analogue Analogue is a transmission standard that uses electrical impulses to emulate the audio waveform of sound. When you use a phone, the variations in your voice are transformed by a microphone into similar variations in an electrical signal and carried down the line to the exchange. Advantages of Analogue less bandwidth is required More Accurate Disadvantages of Analogue Signal loss and distortion can be seen due to the effects of random noise which is impossible to recover GENERATIONS OF CELLULAR SYSTEMS The concept of cellular telephony was introduced in AMPS, short for Advanced Mobile Phone Systems. AMPS divided the total area into small regi ons called cells and this was from where the concept of cellular telephony started. Cellular Systems had many advantages such as they increased quality, capacity, reliability and availability of mobile telephone network. The generations of cellular systems are described below. FIRST GENERATION CELLULAR SYSTEMS First generation cellular telephone systems were introduced in 1980’s. They were based on Analog Frequency Modulation technique. Each channel was assigned a sole frequency.

Hall of frame for president of us Essay Example | Topics and Well Written Essays - 750 words

Hall of frame for president of us - Essay Example He is recognized for his efforts in making the country the world’s superpower during the war. He also had a vision of protecting the county’s citizens from the effects of the great depression. His legislation that guided the country through the great depression makes him a good leader (Stadelmann, 2009). Theodore Roosevelt was a great president who used his influence to the citizens to accept his ideologies. His influential ability helped him to get legislation passed in the congress (Stadelmann, 2009). He was the first president to use his influence to drive his foreign policies with other countries, and this ensured good international relations with them. William Jefferson Clinton is another great US president who is admired for his ability to handle crisis and scandals. He managed scandals effectively without letting them interfere with his leadership. I also like President Ronald Reagan due to his great communication skills; he would influence the public through his speeches and inspire the public through his messages (Bolno, n.d). President John Fitzgerald Kennedy is one of the best influential leaders that I have always admired. He is presumed to have had some leadership attributes from his father who had served as an ambassador in 1937 to 1940. He is renowned for his leadership styles, which the subsequent presidents of the United States have tried to emulate over the years. John Kennedy is best favorable president due to his leadership attributes were exhibited throughout his life. His first attribute as a great leader is charisma. This is due to his ability to inspire people through his practical choice of words. His messages motivated people to accept his leadership policies. He chose very wise words to manage crisis by demonstrating an ability to handle delicate situations amicably. The second attribute that I like about him was his visionary leadership. Kennedy was seen as a visionary leader who shared his vision and goals of the count ry with all citizens through his speeches (Colvin, 2008). This attribute creates an understanding that the future of a country depends on the leaders’ vision. As a visionary leader, he was able to show the direction which he wanted to lead the country. Hence, through this, he received great credibility and support from many people. The third admirable leadership attribute of President Kennedy was that he was able to delegate (Hald, 2007). A leader needs to delegate some powers to his subordinates who should share the same ideologies so that he can ensure that objectives are met in time. In addition, Kennedy’s administration was made up of learned scholars who were competent to take up roles. Hence, Kennedy easily delegated his authority to some of his cabinet while still exercising his control powers. This was seen by his appointment of Dean Rusk as his secretary of state (Hald, 2007). The fourth attribute of Kennedy that I like is that of inspirational leadership, a l eader should inspire his followers towards excellence (Colvin, 2008). Moreover, President Kennedy inspired other people to excel in the duties that they were assigned to, and offered support towards achieving such goals. Therefore, this encouraged teamwork and unity because people felt as part of his government. Lastly, I admire the courage that President Kennedy portrayed especially in dealing with serious issues. Since he had previously served as in the navy, Kennedy was seen to be courageous when dealing

Spirituality Essay Example | Topics and Well Written Essays - 250 words

Spirituality - Essay Example Regardless of this investment and pertinence, the impacts of anxiety and burnout on patient results, understanding security, and quality consideration are not decently characterized by confirmation. Actually, the connection in the middle of stress and burnout to patient results has been investigated in just four examinations. There is an awesome requirement for thorough studies that will analyze these motion in a manner that will yield more strong proof on which to base practice. From the emotionally healthy church stock, I think I can now resolve conflict in a reasonable, coordinate, and conscious way, not what I may have realized experiencing childhood in my family, for example, difficult putdowns, evasion, raising pressures, or heading off to an outsider instead of to the individual straightforwardly (Matt. 18:15 – 18).1 2 3 4 8. I am purposeful at working through the effect of noteworthy "tremor" occasions that molded my present, for example, the demise of a relative, a sudden pregnancy, separate, compulsion, or major money related calamity (Gen. 50:20; Ps. 51). I am ready to express gratitude toward God for all my past backgrounds, perceiving how he has utilized them to extraordinarily shape me into who I am (Gen. 50:20; Rom. 8:28 – 30). I can perceive how certain "generational sins" have been gone down to me through my family history, including character blemishes, lies, privileged insights, methods for adapting to agony, and unfortunate propensities in identifying with others (Ex. 20:5). I neednt bother with support from others to like myself (Prov. 29:25; Gal. 1:10). I assume liability and possession for my past life. From the spiritual assessment of the joint commission, patients need profound quality and trust from their relatives, medical caretakers and specialists. They are their prompt colleagues in spite of God being their supreme being. Most patients are always