Download CDMA Capacity and Quality Optimization (Telecom Engineering) by Adam Rosenberg PDF

By Adam Rosenberg

Now that CDMA has been authorised as a key section of around the world 3G platforms, provider prone, means planners, engineers and technicians have to comprehend the easiest tools and instruments for maximizing throughput, skill, and caliber. This ebook offers that services.

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This requires an audio amplifier that consumes power, but it can operate at much lower power levels than the radio transmitter amplifier. After all, the signal from the audio speaker only has to travel about 1 cm to a user's ear, whereas the signal from the radio transmitter travels several kilometers to a base-station receiver. 2 Antennas and the air interface Lastly, we come to the antenna, where electrical signals become radio waves. Unlike antenna arrays at base stations, the antenna of a mobile telephone is severely limited in size and directional control.

2] If the antenna is used for receiving rather than transmitting, then the term reception pattern might be more appropriate, but we still call it the radiation pattern of the antenna. See Sec. 2 for a detailed explanation. [3] The primary source of interference in CDMA is traffic in the same sector, but after that, traffic in the other sectors in the same cell tend to contribute more interference than traffic in other cells. 2 The Tower and Cable The big question for any base-station deployment is how high to build the tower.

The same can be done by using time-delay filters on the receiver. Smart antenna technology electronically manipulates the phased array so that it can even be used on a call-by-call basis to focus each radio beam very narrowly. Consider the array of six antennas shown in Fig. 2. If we want to send a radio wave toward the right side of the page, as is shown in the figure, then we can transmit the radio wave with a 0-degree phase shift at the left two antennas, a 45-degree phase shift at the middle two antennas, and a 90-degree phase shift at the right two antennas.

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