Sprint's HTC Evo Ushers 4G Era

Sprint's HTC Evo hit U.S. retail stores Friday, June 4, ushering in the 4G era of mobile communication.

HTC Evo owners are generally delighted with their smartphone, but not as much with the limited coverage of Sprint's 4G network, or the mandatory $10 premium data add-on charge.

Powered by the 1GHz Snapdragon processor and Google's Anderoid 2.1 operating system, HTC Evo 4G delivers respectable 4G speeds, according to the New York Times.

It comes with a front-facing camera for video chats and an 8-megapixel camera with HD-video-recording capabilities.

The Evo, which features a 4.3 inch touch screen with HTC Sense interface, can not only download data at blazingly fast speeds, it can function as a mobile hot-spot that lets you connect up to eight devices.

4G Standard

The 4G standard stipulates peak data rates of up to approximately 100 Mbps and flexible channel bandwidth, between 5 and 20 MHz, optionally up to 40 MHz.

There are two competing technologies for implementing 4G: WiMAX and LTE (Long Term Evolution)

LTE and WiMAX differ from Wi-Fi which offers short range high speed wireless connectivity.

WiMAX technology precedes the 4G standard but has evolved to offer peak data rates of 128 Mbps downlink and 56 Mbps uplink over 20 MHz wide channels.

Sprint Nextel has announced that it will be using WiMAX for its 4G network.

Most carriers are backing LTE to implement 4G standard, though LTE specs will only be ratified at the end of 2010. Commercial implementation of the technology is likely to take two years.

LTE meets 4G requirements including downlink peak rates of at least 100Mbps, 50 Mbps in the uplink and RAN (Radio Access Network) round-trip times of less than 10ms.

LTE supports flexible carrier bandwidths, from 1.4MHz up to 20MHz as well as both FDD (Frequency Division Duplex) and TDD (Time Division Duplex).

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