Communications: electrical – Digital comparator systems
Patent
1976-12-06
1977-09-06
Boudreau, Leo H.
Communications: electrical
Digital comparator systems
235177, 325320, 325473, 3401462, G06K 900
Patent
active
040471535
ABSTRACT:
A statistical data detection method for use in a synchronous data transmission system employing either phase modulation, combined amplitude and phase modulation or quadrature amplitude modulation. The signal space diagram of the possible states of the transmitted signal and their influence zones is divided into N elementary squares. Since the squares are rather coarse to save storage space, many such squares belong to more than one influence zone. The influence zone of a state Z defines the region within which the received signal, P, will lie when state Z has been transmitted.
A word in a ROM is assigned to each elementary square, and each word comprises two entries. The entries are identical when a square falls wholly within a single influence zone. Otherwise, the entries are different. Parts of the received signal are converted into an address for addressing the ROM. If the two entries of the word read from the ROM are identical, detection is completed, the transmitted state is the state represented by the entries. If the two entries are different, however, signifying two different states, the square of the distance between P and each of the two states is computed. The closer state is indicated as the most probable transmitted state.
REFERENCES:
patent: 3902160 (1975-08-01), Kawa
Chang, "Finding Prototypes for Nearest Neighbor Classifiers," IEEE Trans. on Computers, vol. C-23, No. 11, Nov. 1974, pp. 1179-1184.
Cutaia, "Multilevel Character Recognition System," IBM Tech. Disclosure Bulletin, vol. 13, No. 12, May 1971, pp. 3739-3742.
Boudreau Leo H.
International Business Machines - Corporation
Thomas Delbert C.
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