EDGE networks create new measurement challenges for handset designers

Durrant, Mike
May 2006
Portable Design;May2006, Vol. 12 Issue 5, p22
The article reports that many cellular network operators are upgrading their existing 2G GSM and GPRS networks to 2.75G cellular standards such as Enhanced Data Rates for Global Evolution (EDGE). EDGE, with a practical limit of 384 kbits/second, offers a 3.3x increase in data rate over GPRS, with a limit of 115 kbits/second with a reasonable error correction. Nevertheless, to achieve the increase in spectral efficiency required for the higher data rate without increasing the 200 kHz channel bandwidth requires a more complicated modulation scheme. In the case of EDGE, offset 8 phase shift keying has been selected to replace Gaussian minimum shift keying, which is used in GSM/GPRS. In terms of the radio frequency portion of a handset design, a good quality GMSK receiver design can be used for 8PSK with no modification. Though the 8PSK constellation contains more points, the synthesizer phase noise and noise figure specifications of a modern highly integrated receiver are more than adequate. Also, as the channel bandwidth is not changed, the filtering requirements remain unchanged.


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