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Narrow-Band Phase-Rotating Phase-Shift Keying
Hiroshi KUBO Makoto MIYAKE
IEICE TRANSACTIONS on Communications
Publication Date: 1999/04/25
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Radio Communication
modulation/demodulation, adaptive equalizers, Viterbi detection, radio spectrum management, land mobile radio,
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This paper proposes a phase-rotating phase-shift keying (PSK) modulation and shows that its narrow-band version is suitable for Viterbi equalization. The proposed PSK has the following features: 1) a spectrum shaping of the transmit/receive filters does not need to be restricted to the Nyquist criterion; 2) the transmitted data sequence is rotated for every symbol in order to reduce noise-correlation at the receiver. First, this paper discusses a performance degradation of bit error rate of Viterbi equalizers in the presence of the sampling timing offset or under time-dispersive frequency selective fading. Next, computer simulation confirms that π/2-shifted binary PSK with narrow-band spectrum shaping filter, which includes offset QPSK for its special case, solves the above mentioned performance degradation, keeping good spectrum efficiency equal to M-ary PSK.