Title :
On the Low-SNR Capacity of Phase-Shift Keying with Hard-Decision Detection
Author_Institution :
Dept. of Electr. Eng., Univ. of Nebraska-Lincoln, Lincoln, NE
Abstract :
The low-SNR capacity of M-ary PSK transmission over both the additive white Gaussian noise (AWGN) and fading channels is analyzed when hard-decision detection is employed at the receiver. Closed-form expressions for the first and second derivatives of the capacity at zero SNR are obtained. The spectral-efficiency/bit-energy tradeoff in the low-SNR regime is analyzed by finding the wideband slope and the bit energy required at zero spectral efficiency. Practical design guidelines are drawn from the information-theoretic analysis. The fading channel analysis is conducted for both coherent and noncoherent cases, and the performance penalty in the low-power regime for not knowing the channel is identified.
Keywords :
AWGN channels; fading channels; modulation coding; phase shift keying; signal detection; M-ary phase-shift keying transmission; additive white Gaussian noise channel; closed-form expression; coded phase modulation; fading channel analysis; hard-decision detection; information-theoretic analysis; low-SNR capacity; AWGN; Additive white noise; Closed-form solution; Fading; Guidelines; Information analysis; Phase detection; Phase shift keying; Signal to noise ratio; Wideband;
Conference_Titel :
Information Theory, 2007. ISIT 2007. IEEE International Symposium on
Conference_Location :
Nice
Print_ISBN :
978-1-4244-1397-3
DOI :
10.1109/ISIT.2007.4557221
