A New Method of Demodulating Digital SSB Signals

Yoichi SAITO  Takahiro YAMASAKI  Fumio TAKAHATA  

IEICE TRANSACTIONS on Communications   Vol.E85-B    No.10    pp.2255-2262
Publication Date: 2002/10/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technology
digital SSB,  Hilbert filter,  class-IV partial-response signaling,  spectrum efficiency,  power efficiency,  

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This paper presents the transmission performance of a class-IV partial-response signaling SSB system and proposes a method that can improve its power efficiency. A line code that has no dc component has been used in the SSB transmission of digital signals. The type of line code, such as a partial-response signaling, increases the modulation states, and as a result, decreases the power efficiency. To overcome this obstacle, a new demodulation method called "re-filtering and combining" is proposed on the assumption of orthogonal phase detection. The demodulated quadrature channel is re-filtered by a Hilbert filter and is combined with the in-phase channel. It is confirmed by computer simulations that the new demodulation method improves the BER performance and a 3 dB improvement of the power efficiency is obtained.