Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1997-12-11
2000-08-29
Le, Amanda T.
Pulse or digital communications
Spread spectrum
Direct sequence
375150, 375343, 375346, H04L 2714, H04J 1304
Patent
active
061119105
ABSTRACT:
A maximal correlation symbol estimation (MCSE) method for estimating the symbols that are modulating an information signal component of a received signal, which can be applied to received signals that additionally contain an interference signal component, is disclosed. The method is achieved by correlating the received signal with all possible reference signals, each reference signal being one of a closed set of all possible information signals recognized by the given digital modulation scheme, and selecting as an estimate of the information signal the reference signal whose correlation with the received signal most closely resembles a weighted average of correlations between previously estimated information signals and their corresponding received signals. Demodulators that implement this method are adapted to perform many functions, including the estimation of symbols modulating frequency modulated (FM) received signals prior to the signals being FM demodulated. The embodiment of the MCSE demodulator adapted to carry out this last function, is designed to reduce inter-symbol interference caused by filter responses in the transmitter and receiver, and to permit each symbol to modulate a non-integer average number of signal samples.
REFERENCES:
patent: 5602833 (1997-02-01), Zehavi
patent: 5946345 (1999-08-01), Zehavi
Harry Lieb, Data-Aided Noncoherent Demodulation of DPSK, Apr. 1995, pp. 722-755, IEE Transactions on Communications, vol. 43, No. 2/3/4.
Cui Jian
Hilborn Derek Stephen
Le Amanda T.
Nortel Networks Corporation
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