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Report on the Wireless Industry

Report on the Wireless Industry


Since 1989, the wireless industry began to explore by adapting digital
technology replacing the existing analog network as a means of improving capacity due to the increase of wireless service demands. Digital has a number of advantages over analog transmission:

• Economizes on bandwidth

• Allows easy integration with personal communication systems (PCS) devices

• Maintains superior quality of voice transmission over long distances

• Difficult to decode

• Can use lower average transmitter power

• Enables smaller and less expensive individual receivers and transmitters

• Offer voice privacy

At that period, Time Division Multiple Access (TDMA) was chosen to replace Motorola’s Frequency Division Multiple Access (FDMA) technology which known today as narrowband analog mobile phone service. FDMA allocates a single channel to one user at a time. FDMA is wasteful of bandwidth: the channel is assigned to a single conversation whether or not somebody is speaking. Moreover, it cannot handle alternate forms of data, only voice transmissions. Qualcomm then introduced the Code Division Multiple Access (CDMA) technology to compete against TDMA technology to provide digital service. Now the two major competing systems (TDMA and CDMA), have been a topic for debate throughout the wireless community over which technology has the superior quality.

WHAT IS TDMA?

TDMA is digital transmission technology that allows a number of users to access a single radio-frequency (RF) channel without interference by allocating unique time slots to each user with thin a channel. The digital conversations from a single transmitter occupy different time slots in several bands at the same time

In TDMA, the access technique used exercises three users sharing a 30-kHz carrier frequency. TDMA is also the technology used in Europe where Global System for Mobile Communications (GSM) is the digital standard used to provide wireless access and in Japan where Personal Digital Cellular (PDC) is used as the standard. TDMA was chosen for these standards due to the reason that it enables some essential features for system operation in an advanced cellular or PCS environment. A single channel can carry all four conversations if each conversation is divided in short fragments, is assigned a time slot, and is transmitted in corresponding time bursts.

TDMA also offers the ability to carry data rates of 64kbps to 120 Mbps. This enables service providers to offer short message services as well as bandwidth-intensive applications such as multimedia and videoconferencing. Unlike...

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