Title :
Differential detection of π/4-shifted-DQPSK for digital cellular radio
Author :
Chennakeshu, Sandeep ; Saulnier, G.J.
Author_Institution :
General Electric Co., Schenectady, NY, USA
Abstract :
A high-capacity digital cellular system is being developed in the US. This system will use filtered π/4-shifted-DQPSK (differential quaternary phase-shift keying) modulation, achieving a spectral efficiency of 1.62 b/Hz. The BER (bit error rate) performance of this modulation was studied using differential detection. A tangent-type differential detector with an integrated sample and carrier frequency error correction algorithm is presented. Theoretical and simulation BER results are presented for static and flat fading channels. Additional results are provided on the BER sensitivity to Doppler, time delay spread, carrier frequency errors, and DC offsets
Keywords :
cellular radio; demodulation; digital radio systems; error correction; fading; phase shift keying; π/4-shifted-DQPSK; BER; DC offsets; Doppler sensitivity; bit error rate; carrier frequency errors; differential detection; differential quaternary phase-shift keying; digital cellular radio; error correction algorithm; flat fading channels; spectral efficiency; static fading channels; tangent-type differential detector; time delay spread; Bit error rate; Detectors; Digital filters; Digital modulation; Error correction; Fading; Frequency; Phase detection; Phase modulation; Phase shift keying;
Conference_Titel :
Vehicular Technology Conference, 1991. Gateway to the Future Technology in Motion., 41st IEEE
Conference_Location :
St. Louis, MO
Print_ISBN :
0-87942-582-2
DOI :
10.1109/VETEC.1991.140474
