TW200723795A - A demodulation method using soft decision for quadrature amplitude modulation and apparatus thereof - Google Patents

A demodulation method using soft decision for quadrature amplitude modulation and apparatus thereof

Info

Publication number
TW200723795A
TW200723795A TW094143149A TW94143149A TW200723795A TW 200723795 A TW200723795 A TW 200723795A TW 094143149 A TW094143149 A TW 094143149A TW 94143149 A TW94143149 A TW 94143149A TW 200723795 A TW200723795 A TW 200723795A
Authority
TW
Taiwan
Prior art keywords
soft decision
demodulation
amplitude modulation
quadrature amplitude
demodulation method
Prior art date
Application number
TW094143149A
Other languages
Chinese (zh)
Other versions
TWI387274B (en
Inventor
Hong-Seok Seo
Tae-Hoon Kim
Original Assignee
Hong-Seok Seo
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 Hong-Seok Seo filed Critical Hong-Seok Seo
Priority to TW94143149A priority Critical patent/TWI387274B/en
Publication of TW200723795A publication Critical patent/TW200723795A/en
Application granted granted Critical
Publication of TWI387274B publication Critical patent/TWI387274B/en

Links

Abstract

The present invention relates to demodulation using soft decision for square quadrature amplitude modulation (QAM). In a soft decision method for demodulation of a received signal of square QAM comprised of the same phase signal component and an orthogonal phase signal component, the demodulation method using soft decision uses a function that includes a condition judgment operation from an orthogonal phase component value of a received signal and the same phase component value to gain each soft decision value corresponding to a beat position of hard decision, namely a condition probability vector value, so as to thereby improve the processing speed and reduce the manufacturing expense.
TW94143149A 2005-12-07 2005-12-07 A demodulation method using soft decision for quadrature amplitude modulation and apparatus thereof TWI387274B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
TW94143149A TWI387274B (en) 2005-12-07 2005-12-07 A demodulation method using soft decision for quadrature amplitude modulation and apparatus thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TW94143149A TWI387274B (en) 2005-12-07 2005-12-07 A demodulation method using soft decision for quadrature amplitude modulation and apparatus thereof

Publications (2)

Publication Number Publication Date
TW200723795A true TW200723795A (en) 2007-06-16
TWI387274B TWI387274B (en) 2013-02-21

Family

ID=48222426

Family Applications (1)

Application Number Title Priority Date Filing Date
TW94143149A TWI387274B (en) 2005-12-07 2005-12-07 A demodulation method using soft decision for quadrature amplitude modulation and apparatus thereof

Country Status (1)

Country Link
TW (1) TWI387274B (en)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2756996A1 (en) * 1996-12-10 1998-06-12 Philips Electronics Nv DIGITAL TRANSMISSION SYSTEM AND METHOD COMPRISING A PRODUCT CODE COMBINED WITH MULTI-DIMENSIONAL MODULATION
US6594318B1 (en) * 1999-12-02 2003-07-15 Qualcomm Incorporated Method and apparatus for computing soft decision input metrics to a turbo decoder
US6507619B1 (en) * 2000-03-24 2003-01-14 Atheros Communications, Inc. Decoding system and method for digital communications
JP2004512742A (en) * 2000-10-16 2004-04-22 ジステモニック・アクチエンゲゼルシヤフト Method for generating soft bit information from gray coded signal
US6834088B2 (en) * 2001-03-12 2004-12-21 Motorola, Inc. Method and apparatus for calculating bit log-likelihood ratios for QAM signals
US6993098B2 (en) * 2001-07-12 2006-01-31 Koninklijke Philips Electronics N.V. Method and apparatus for efficient calculating distance metric
US7085328B2 (en) * 2002-12-24 2006-08-01 Realtek Semiconductor Corp. QAM receiver having joint gain, carrier recovery and equalization adaptation system
US6862552B2 (en) * 2003-01-15 2005-03-01 Pctel, Inc. Methods, apparatus, and systems employing soft decision decoding
US7502412B2 (en) * 2004-05-20 2009-03-10 Qisda Corporation Adaptive channel estimation using decision feedback

Also Published As

Publication number Publication date
TWI387274B (en) 2013-02-21

Similar Documents

Publication Publication Date Title
WO2008042134A3 (en) Performing a coordinate rotation digital computer (cordic) operation for amplitude modulation (am) demodulation
TW200616371A (en) Receiver capable of correcting in-phase and quadrature-phase mismatch and method thereof
EP1770939A3 (en) Reception in a wireless communication system which uses interleaving of both bits and symbols
WO2006055797A3 (en) Interference suppression with virtural antennas
WO2008027441A3 (en) I/q imbalance compensation
TW200714009A (en) Diversity receiver
WO2003013093A3 (en) Signal decomposition for the control of its dynamic range
BR0109045A (en) Method and Equipment for Computing Soft Decision Input Measurements for a Turbo Decoder
WO2006083419A3 (en) Delay restricted channel estimation for multi-carrier systems
GB2433389A (en) Near Field RF Communications
EP1478149A3 (en) Multicarrier receiver
WO2012154923A3 (en) Optical receiver for amplitude-modulated signals
WO2006044089A3 (en) Low if receiver systems and methods
WO2013117883A8 (en) Method and apparatus for improved qam constellations
WO2006137802A3 (en) A method for using chip sample correlations with scale factors in a cdma receiver
MY164135A (en) Systems and methods for asynchronous re-modulation with adaptive i/q adjustment
WO2009025611A3 (en) Selective signal demodulation method and apparatus
CN103312643B (en) Balancer, receiving system and equalization methods
NO20076248L (en) System and method for communicating data using constant amplitude waveform with hybrid orthogonal modulation and MSK or GMSK modulation
EP2701392A3 (en) Measuring channel signal to noise metric using constellation data
MX2017013935A (en) Selecting angular active constellation extension for non-square constellations and extension along x or y axis for square constellations.
ATE553544T1 (en) METHOD AND DEVICE FOR ESTIMATING GAIN OFFSETS FOR AMPLITUDE MODULATED COMMUNICATION SIGNALS
WO2009075105A1 (en) Sampling mixer, quadrature demodulator, and wireless device
WO2006032917A3 (en) Apparatus for and method of signal processing
WO2007046061A3 (en) Polar modulation apparatus and method using fm modulation