Title :
Digital frequency estimation in burst mode QPSK transmission
Author :
Bellini, S. ; Molinari, C. ; Tartara, G.
Author_Institution :
Dipartimento di Elettronica, Politecnico di Milano, Italy
fDate :
7/1/1990 12:00:00 AM
Abstract :
In burst digital transmission using PSK (phase shift keying) modulation with coherent detection, the recovery of the carrier reference phase and the symbol clock is a key aspect. If all users have a common clock synchronization, symbol timing needs not to be recovered in each burst. A digital processor for carrier recovery without preambles, in the presence of frequency offset, is considered. As an example, a 2 Mb/s QPSK transmission system is considered in which E b/No=10 dB, and the burst and estimation interval length L=15. Using the algorithm described and averaging eight successive estimated frequency offsets, in order to eliminate anomalous errors, the BER (bit error rate) degradation is equal to 0.14 dB when Δf=20 kHz
Keywords :
digital radio systems; phase shift keying; synchronisation; 2 Mbit/s; BER; QPSK; bit error rate; burst digital transmission; carrier reference phase recovery; coherent detection; common clock synchronization; digital frequency estimation; frequency offset; phase shift keying; symbol clock recovery; symbol timing; Bit error rate; Clocks; Digital modulation; Frequency estimation; Frequency synchronization; Phase detection; Phase modulation; Phase shift keying; Quadrature phase shift keying; Timing;
Journal_Title :
Communications, IEEE Transactions on
