Precision symbol demodulation system for multi-carrier modulatio

Details Precision symbol demodulation system for multi-carrier modulatio Precision symbol demodulation system for multi-carrier modulatio

1995-11-03

1998-02-10

Chin, Wellington

Pulse or digital communications

Receivers

Angle modulation

375261, 329304, 329306, H04L 2714

Patent

active

057177228

ABSTRACT:
When a signal modulated by a multi-subcarrier modulation scheme is to be demodulated, an amplitude detection unit sequentially detects the amplitudes of a subcarrier-synthesized signal to accurately set a symbol discrimination timing for the modulated signal within a short period of time. A reference amplitude storage unit stores a reference amplitude at a portion corresponding to a predetermined reference symbol portion included in the received signal. A correlation calculation unit sequentially calculates correlation values between amplitudes sequentially detected by the amplitude detection unit and the reference amplitude. A discrimination timing determination unit determines a symbol discrimination timing on the basis of time representing a maximum value of the correlation values sequentially calculated by the correlation calculation unit. When the signal modulated by the multi-subcarrier modulation scheme is to be demodulated, a phase detection unit detects a phase .theta. of the subcarrier-synthesized signal at a predetermined portion to easily and properly correct the frequency offset of a carrier frequency.

REFERENCES:
patent: 3835404 (1974-09-01), Nakamura et al.
patent: 4039961 (1977-08-01), Ishio et al.
patent: 4584534 (1986-04-01), Lijphart et al.
patent: 5243629 (1993-09-01), Wei
patent: 5600672 (1997-02-01), Oshima et al.
Digital MCA System RCR Standard STD-32, pp. 1-30; Research & Development Center for Radio System (in Japan), published on Mar. 17, 1993.

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