Title :
EVM degradation in EDGE two point modulation scheme due to quantization effects
Author :
Avitabile, Gianfranco ; Lofü, Nicola
Author_Institution :
Politecnico di Bari, Italy
Abstract :
The EDGE standard is an evolution of GSM, overcoming the limited data speed. This improvement is obtained using a 3π/8 8-PSK modulation scheme, increasing the available on-air data rate up to 812.5 kbit/s. The drawback of this modulation scheme is the nonconstant envelope, demanding a 17 dB dynamic range PA. An easy way to implement the EER architecture is with two-point modulation in the theta-path. The quantization in the high-pass phase path together with the PLL bandwidth causes both a spectrum regrowth and an increasing EVM.
Keywords :
cellular radio; data communication; delta-sigma modulation; packet radio networks; phase locked loops; phase shift keying; quantisation (signal); 8-PSK modulation; DAC; EDGE standard; EER architecture; EVM degradation; GSM; PLL bandwidth; high-pass phase path; nonconstant envelope; on-air data rate; quantization effects; spectrum regrowth; theta-path; two point modulation; Degradation; Quantization;
Conference_Titel :
Radio and Wireless Conference, 2004 IEEE
Print_ISBN :
0-7803-8451-2
DOI :
10.1109/RAWCON.2004.1389135
