i need wireless communication for attend competitive exams plz help me

  wireless communication textbook by mullet.pdf (Size: 1.5 MB / Downloads: 8)






Practical electrical communications began in the United States over
150 years ago with the invention of the telegraph by Morse. The invention
of the telephone by Bell in 1876 brought with it the first manually
switched wireline network. Radio or wireless was invented at the turn of
the twentieth century, adding the convenience of mobile or untethered
operation to electronic communications. For many years, wireless communications
primarily provided entertainment and news to the masses
through radio broadcasting services. Wireless mobility took the form of a
car radio with simplex (one-way) operation. Two-way mobile wireless
communications were limited to use by various public service departments,
government agencies and the military, and for fleet communications
of various industries. As technology decreased the size of the mobile
unit, it became a handheld device known as a “walkie-talkie.”