Processing

Please wait...

Settings

Settings

Goto Application

1. WO2001061952 - DELAYED DECISION FEEDBACK LOG-MAP EQUALIZER

Publication Number WO/2001/061952
Publication Date 23.08.2001
International Application No. PCT/US2001/004312
International Filing Date 12.02.2001
Chapter 2 Demand Filed 20.08.2001
IPC
H04L 25/03 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
25Baseband systems
02Details
03Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
CPC
H04L 25/03171
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
25Baseband systems
02Details
03Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
03006Arrangements for removing intersymbol interference
03171Arrangements involving maximum a posteriori probability [MAP] detection
H04L 25/03235
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
25Baseband systems
02Details
03Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
03006Arrangements for removing intersymbol interference
03178Arrangements involving sequence estimation techniques
03203Trellis search techniques
03235with state-reduction using feedback filtering
H04L 25/03318
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
25Baseband systems
02Details
03Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
03006Arrangements for removing intersymbol interference
03178Arrangements involving sequence estimation techniques
03312Arrangements specific to the provision of output signals
03318Provision of soft decisions
H04L 27/22
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
27Modulated-carrier systems
18Phase-modulated carrier systems, i.e. using phase-shift keying
22Demodulator circuits; Receiver circuits
Applicants
  • ERICSSON INC. [US]/[US]
Inventors
  • CHENG, Jung-Fu
Agents
  • BENNETT, David, E.
Priority Data
09/503,78814.02.2000US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) DELAYED DECISION FEEDBACK LOG-MAP EQUALIZER
(FR) EGALISEUR LOG-MAP A DECISION RETROACTIVE RETARDEE
Abstract
(EN)
A delayed decision feedback Log-MAP equalizer generates optimal soft information at the bit level for MPSK and MDPSK modulations over multipath fading channels. The algorithms have a forward-backward recursion structure similar to conventional Log-MAP algorithms. To reduce complexity, the forward recursion incorporates the techniques of delayed decision feedback sequence estimation to construct a reduced state space. The backward recursion then takes this state space as given, in that it does not hypothesize feedbacks, and computes required soft information.
(FR)
Un égaliseur Log-MAP à décision rétroactive retardée génère des informations transitoires optimales au niveau du bit pour les modulations MPSK et MDPSK sur des voies d'évanouissement dû à la propagation par trajets multiples. Les algorithmes possèdent une structure de récursion avant-arrière similaire à celle des algorithmes Log-Map classiques. Pour réduire la complexité, la récursion avant comporte des techniques d'estimation de séquence à décision rétroactive retardée pour la construction d'un espace d'état réduit. La récursion arrière prend cet espace d'état tel quel, en ce qu'il ne formule pas d'hypothèses au sujet des rétroactions, et calcule les informations transitoires requises.
Latest bibliographic data on file with the International Bureau