Soft decision method and receiver

Details Soft decision method and receiver Soft decision method and receiver

1997-10-30

2000-09-05

Chin, Stephen

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

375262, 714794, 714795, H03D 100

Patent

active

061154350

ABSTRACT:
When the received symbol is located (FIG. 4) within one of regions G, H, I, L, M, N, Q, R, and S, 2 bits are decided to be most reliable to obtain their soft decision values=0 or 7. As for the remaining 2 bits, a soft decision value=0 to 7 is decided by soft decision in the I- or Q-axis direction. When the received symbol is located within one of regions A, E, U, and Y, all the 4 bits are decided to obtain their soft decision values=0 or 7. When the received symbol is located with one of regions B, C, D, F, J, K, 0, P, T, V, W, and X, 3 bits are decided to be most reliable to obtain their soft decision values=0 or 7. As for the remaining 1 bit, a soft decision value=0 to 7 is obtained by soft decision in the I- or Q-axis direction. A soft decision method that can implement soft decision in multilevel (amplitude and/or phase) modulation and can fully exhibit the correction performance of maximum likelihood coding can be provided.

REFERENCES:
patent: 4742533 (1988-05-01), Weidner et al.
patent: 4882733 (1989-11-01), Tanner
patent: 5321725 (1994-06-01), Paik et al.
patent: 5363408 (1994-11-01), Paik et al.
patent: 5654986 (1997-08-01), Lim

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