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WO2007030308A3 - Method and apparatus for de-mapping a symbol modulated by a high order quadrature amplitude modulation - Google Patents

Method and apparatus for de-mapping a symbol modulated by a high order quadrature amplitude modulation Download PDF

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Publication number
WO2007030308A3
WO2007030308A3 PCT/US2006/032643 US2006032643W WO2007030308A3 WO 2007030308 A3 WO2007030308 A3 WO 2007030308A3 US 2006032643 W US2006032643 W US 2006032643W WO 2007030308 A3 WO2007030308 A3 WO 2007030308A3
Authority
WO
WIPO (PCT)
Prior art keywords
msb
soft bit
threshold
mapping
amplitude modulation
Prior art date
Application number
PCT/US2006/032643
Other languages
French (fr)
Other versions
WO2007030308A2 (en
Inventor
Qingyuan Dai
Robert Lind Olesen
Chang-Soo Koo
Nirav Shah
Original Assignee
Interdigital Tech Corp
Qingyuan Dai
Robert Lind Olesen
Chang-Soo Koo
Nirav Shah
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Interdigital Tech Corp, Qingyuan Dai, Robert Lind Olesen, Chang-Soo Koo, Nirav Shah filed Critical Interdigital Tech Corp
Publication of WO2007030308A2 publication Critical patent/WO2007030308A2/en
Publication of WO2007030308A3 publication Critical patent/WO2007030308A3/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/38—Demodulator circuits; Receiver circuits
    • H04L27/3809—Amplitude regulation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/06—DC level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection
    • H04L25/067—DC level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection providing soft decisions, i.e. decisions together with an estimate of reliability

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

A method and apparatus for de-mapping a symbol modulated by a high order quadrature amplitude modulation (QAM) are disclosed. A transmitting wireless transmit/receive unit (WTRU) maps N input bits to one of 2N symbols in a 2N-QAM constellation. A receiving WTRU receives a signal and generates a sample of the received signal. A soft bit value of the most significant bit (MSB) is calculated based on a value of the sample. A magnitude of the soft bit value of the MSB is subtracted from a threshold. The threshold is initially set with respect to the QAM order, N. A soft bit value of the next MSB is calculated based on the subtraction results. The calculation and subtraction steps are repeated for the next MSB until soft bit values of all the remaining bits are obtained while diving the threshold by 2 each iteration.
PCT/US2006/032643 2005-09-08 2006-08-22 Method and apparatus for de-mapping a symbol modulated by a high order quadrature amplitude modulation WO2007030308A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US71523505P 2005-09-08 2005-09-08
US60/715,235 2005-09-08

Publications (2)

Publication Number Publication Date
WO2007030308A2 WO2007030308A2 (en) 2007-03-15
WO2007030308A3 true WO2007030308A3 (en) 2007-05-18

Family

ID=37836338

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2006/032643 WO2007030308A2 (en) 2005-09-08 2006-08-22 Method and apparatus for de-mapping a symbol modulated by a high order quadrature amplitude modulation

Country Status (1)

Country Link
WO (1) WO2007030308A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114422317B (en) * 2022-03-29 2022-07-05 中山大学 A method for multi-carrier QAM mapping/demapping circuit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6952458B1 (en) * 2000-10-02 2005-10-04 Globespanvirata, Inc. Demapping system and method
US20060274862A1 (en) * 2005-06-06 2006-12-07 Lui Gee L Quaternary precoded continuous phase modulation soft bit metric demodulator

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6952458B1 (en) * 2000-10-02 2005-10-04 Globespanvirata, Inc. Demapping system and method
US20060274862A1 (en) * 2005-06-06 2006-12-07 Lui Gee L Quaternary precoded continuous phase modulation soft bit metric demodulator

Also Published As

Publication number Publication date
WO2007030308A2 (en) 2007-03-15

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