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 thereofInfo
- 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
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.
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)
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 |
-
2005
- 2005-12-07 TW TW94143149A patent/TWI387274B/en active
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 |