Title:
データ通信システムでのチャネル復号器の入力軟性決定値計算装置及び方法
Document Type and Number:
Japanese Patent JP3910586
Kind Code:
B2
Abstract:
A 64-ary QAM (Quadrature Amplitude Modulation) demodulation apparatus and method for receiving an input signal R k (X k ,Y k ) comprised of a k th quadrature-phase signal Y k and a k th in-phase signal X k , and generating soft decision values A(s k,5 ), A(s k,4 ), A(s k,3 ), A(s k,2 ), A(s k,1 ) and A(s k,0 ) for the input signal R k (X k , Y k ) are disclosed. A first soft decision value generator receives the quadrature-phase signal Y k of the received signal R k and a distance value 2a between six demodulated symbols on the same axis, and generates soft decision values A(s k,5 ), A(s k,4 ) and A(s k,3 ) for sixth, fifth and fourth demodulated symbols. A second soft decision value generator receives the in-phase signal X k of the received signal R k and the distance value 2a between the six demodulated symbols on the same axis, and generates soft decision values A(s k,2 ), A(s k,1 ) and A(s k,0 ) for third, second and first demodulated symbols.
Inventors:
Sun-Hyuk Ha
Min Goo Kim
Min Goo Kim
Application Number:
JP2003529725A
Publication Date:
April 25, 2007
Filing Date:
September 17, 2002
Export Citation:
Assignee:
Samsung Electronics Company Limited
International Classes:
H03M13/45; H04L27/00; H03M5/12; H04L25/06; H04L27/34; H04L27/38
Domestic Patent References:
| JP2002330188A | ||||
| JP2000315957A | ||||
| JP7131493A | ||||
| JP10136046A | ||||
| JP2002277A | ||||
| JP7046276A | ||||
| JP10341267A | ||||
| JP2000224250A |
Foreign References:
| US6078626 | ||||
| WO1998012836A1 |
Other References:
E. Baccarelli,A New Family of Decision Delay-Constrained MAP Decoders for Data Transmission over Noisy Channels with IS1 and Soft-Decision Demodulation,IEEE Proceedings 1995 International Symposium on Information Theory,米国,1995年 9月,page 333
Attorney, Agent or Firm:
Masatake Shiga
Takashi Watanabe
Takashi Watanabe