Pulse shaping filter for .pi./4-shift QPSK modulator

Details Pulse shaping filter for .pi./4-shift QPSK modulator Pulse shaping filter for .pi./4-shift QPSK modulator

1997-03-27

1999-03-09

Chan, Jason

Pulse or digital communications

Transmitters

Quadrature amplitude modulation

375261, 370497, 370535, 370536, 332102, H04L 2736

Patent

active

058811095

ABSTRACT:
A pulse shaping filter for the .pi./4-shift QPSK modulator employed in IS-54 and JDC. The pulse shaping filter includes symbol determining circuits of the I-channel and the Q-channel, demultiplexers for inverse multiplexing each of the input signal value from the symbol determining circuits, a plurality of shift registers for shifting data from each of the demultiplexers according to odd and even symbol clock, a multiplexer for multiplexing each data from the shift registers to produce the corresponding address values, a plurality of ROM tables for storing the multiplexed address value, and a multiplexing and adding unit for multiplexing the address value stored in the ROM tables and adding the resulting multiplexed value.

REFERENCES:
patent: 4961206 (1990-10-01), Tomlinson et al.
patent: 5065396 (1991-11-01), Castellano et al.
patent: 5361047 (1994-11-01), Takahara et al.
patent: 5537405 (1996-07-01), Yoshifuji
patent: 5555547 (1996-09-01), Lemaitre et al.
Sakata, T., et al., A New Fully-Digitalized .pi./4-Shift QPSK Modulator for Personal Communication Terminals, IEECE Trans. Commun. vol. E77-B, No. 7, Jul. 1994, pp. 921-926.

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