CA2625111A1 - A soft demodulating method for 16qam in communication system - Google Patents
A soft demodulating method for 16qam in communication system Download PDFInfo
- Publication number
- CA2625111A1 CA2625111A1 CA002625111A CA2625111A CA2625111A1 CA 2625111 A1 CA2625111 A1 CA 2625111A1 CA 002625111 A CA002625111 A CA 002625111A CA 2625111 A CA2625111 A CA 2625111A CA 2625111 A1 CA2625111 A1 CA 2625111A1
- Authority
- CA
- Canada
- Prior art keywords
- decision
- decided
- tends
- less
- 16qam
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
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
- H04L27/3845—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier
- H04L27/3854—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier using a non - coherent carrier, including systems with baseband correction for phase or frequency offset
- H04L27/3863—Compensation for quadrature error in the received signal
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
A soft demodulating method for 16-ary QAM(quadrature amplitude modulation) in a communication system can obtain average power of each constellation in 16QAM
by estimating receiving power in traffic channels; And then said received intermediate frequency signal can be made carrier wave delamination, and in-phase symbol sequence information I and quadrature symbol sequence information Q can be obtained; Based on the constellation mapping relation between said input binary bits sequence and I, Q branch, different decision segment and corresponding error probability decision curve can be determined; and in different decision segment, decision can be made for obtained in-phase symbol sequence information and quadrature symbol sequence information by using corresponding decision curve, in order to obtain real value soft information sequence; Finally, resulting real value sequence should be input to decoder and made error correction decoding, reception bits sequence corresponding to transmission bits can be decoded. Present invention can combine fully the advantage of hard decision and soft decision, the algorithm is simple, and it is can be realized easily.
by estimating receiving power in traffic channels; And then said received intermediate frequency signal can be made carrier wave delamination, and in-phase symbol sequence information I and quadrature symbol sequence information Q can be obtained; Based on the constellation mapping relation between said input binary bits sequence and I, Q branch, different decision segment and corresponding error probability decision curve can be determined; and in different decision segment, decision can be made for obtained in-phase symbol sequence information and quadrature symbol sequence information by using corresponding decision curve, in order to obtain real value soft information sequence; Finally, resulting real value sequence should be input to decoder and made error correction decoding, reception bits sequence corresponding to transmission bits can be decoded. Present invention can combine fully the advantage of hard decision and soft decision, the algorithm is simple, and it is can be realized easily.
Claims (5)
1. A soft demodulation method of 16 Quadrature Amplitude Modulation (16QAM), performing soft decision demodulation for binary bit sequence processed at sending end with 16QAM to get corresponding real value soft information sequence , including the following steps of:
estimating receiving power of traffic channel according to pilot power and power deviation between the traffic channel and pilot channel to obtain an average power P ave of 16QAM constellation;
removing carrier from intermediate frequency signals received in order to obtain in-phase symbol sequence information I and quadrature symbol sequence information Q;
determining different decision segments and their corresponding error probability decision curves according to constellation mapping relationship between the binary bit sequence input during said 16QAM and I, Q branches, and based on this, judging said obtained in-phase symbol sequence information and quadrature symbol sequence information in the different decision segments by using the corresponding decision curves in order to obtain real value soft information sequence .
estimating receiving power of traffic channel according to pilot power and power deviation between the traffic channel and pilot channel to obtain an average power P ave of 16QAM constellation;
removing carrier from intermediate frequency signals received in order to obtain in-phase symbol sequence information I and quadrature symbol sequence information Q;
determining different decision segments and their corresponding error probability decision curves according to constellation mapping relationship between the binary bit sequence input during said 16QAM and I, Q branches, and based on this, judging said obtained in-phase symbol sequence information and quadrature symbol sequence information in the different decision segments by using the corresponding decision curves in order to obtain real value soft information sequence .
2. The method according to claim 1, further including:
inputting said obtained real value sequence into a decoder for error correction decoding to obtain a received bits sequence corresponding to sent bits.
inputting said obtained real value sequence into a decoder for error correction decoding to obtain a received bits sequence corresponding to sent bits.
3. The method according to claim 1, wherein said 16QAM is a 16QAM in a High Speed Downlink Packet Access system; said step of determining the different decision segments and their corresponding error probability decision curves according to the mapping relationship is:
when the in-phase symbol information I is positive, the corresponding ~ tends to be decided as 0, the greater the I is, the higher a probability of right decision for ~ is; when the I is negative, the corresponding ~ tends to be decided as 1, and the less the I is, the higher the probability of right decision for ~ is;
when the quadrature symbol information Q is positive, the corresponding ~
tends to be decided as 0, and the greater the Q is, the higher the probability of right decision for ~ is;
when the Q is negative, the corresponding ~ tends to be decided as 1, and the less the Q is, the higher the probability of right decision for ~ is;
when the in-phase symbol information I is greater than 0.9487 or less than -0.9487, the corresponding ~ tends to be decided as 1; when the I is greater than -0.3162 and less than 0.3162, the corresponding ~ tends to be decided as 0; When the I is greater than -0.9487 and less than -0.3162 or the I is greater than 0.3162 and less than 0.9487, whether the corresponding ~ tends to be decided as 0 or as 1 is decided by a value of the I, the more the I
tends to be 0, the higher the probability of correctness of ~ being decided as 0 is, and the more the I tends to be I or -1, the higher the probability of correctness of ~
being decided as 1 is;
when the quadrature symbol information Q is greater than 0.9487 or less than -0.9487, the corresponding ~ tends to be decided as 1; when Q is greater than -0.3162 and less than 0.3162, the corresponding ~ tends to be decided as 0; when Q is greater than -0.9487 and less than -0.3162 or Q is greater than 0.3162 and less than 0.9487, whether the corresponding ~
tends to be decided as 0 or as I is decided by the value of the Q, the more the Q tends to be 0, the higher the probability of correctness of ~ being decided as 0 is, and the more the Q tends to be 1 or -1, the higher the probability of correctness of ~ being decided as 1 is.
when the in-phase symbol information I is positive, the corresponding ~ tends to be decided as 0, the greater the I is, the higher a probability of right decision for ~ is; when the I is negative, the corresponding ~ tends to be decided as 1, and the less the I is, the higher the probability of right decision for ~ is;
when the quadrature symbol information Q is positive, the corresponding ~
tends to be decided as 0, and the greater the Q is, the higher the probability of right decision for ~ is;
when the Q is negative, the corresponding ~ tends to be decided as 1, and the less the Q is, the higher the probability of right decision for ~ is;
when the in-phase symbol information I is greater than 0.9487 or less than -0.9487, the corresponding ~ tends to be decided as 1; when the I is greater than -0.3162 and less than 0.3162, the corresponding ~ tends to be decided as 0; When the I is greater than -0.9487 and less than -0.3162 or the I is greater than 0.3162 and less than 0.9487, whether the corresponding ~ tends to be decided as 0 or as 1 is decided by a value of the I, the more the I
tends to be 0, the higher the probability of correctness of ~ being decided as 0 is, and the more the I tends to be I or -1, the higher the probability of correctness of ~
being decided as 1 is;
when the quadrature symbol information Q is greater than 0.9487 or less than -0.9487, the corresponding ~ tends to be decided as 1; when Q is greater than -0.3162 and less than 0.3162, the corresponding ~ tends to be decided as 0; when Q is greater than -0.9487 and less than -0.3162 or Q is greater than 0.3162 and less than 0.9487, whether the corresponding ~
tends to be decided as 0 or as I is decided by the value of the Q, the more the Q tends to be 0, the higher the probability of correctness of ~ being decided as 0 is, and the more the Q tends to be 1 or -1, the higher the probability of correctness of ~ being decided as 1 is.
4. The method according to claim 1, wherein said 16QAM is a 16QAM in a High Speed Downlink Packet Access system; said step of deciding the different decision segments and their corresponding error probability decision curves according to the mapping relationship is:
whatever the value of the I is, the error probability decision curve of ~should meet the equation: ;
whatever the value of the Q is, the error probability decision curve of ~should meet the equation: .
when the I is greater than or equal to 0, the error probability decision curve of ~ should meet the equation:
when the I is less than 0, the error probability decision curve of ~ should meet the equation:
when the Q is greater than or equal to 0, the error probability decision curve of ~should meet the equation:
when the Q is less than 0, the error probability decision curve of ~should meet the equation:
whatever the value of the I is, the error probability decision curve of ~should meet the equation: ;
whatever the value of the Q is, the error probability decision curve of ~should meet the equation: .
when the I is greater than or equal to 0, the error probability decision curve of ~ should meet the equation:
when the I is less than 0, the error probability decision curve of ~ should meet the equation:
when the Q is greater than or equal to 0, the error probability decision curve of ~should meet the equation:
when the Q is less than 0, the error probability decision curve of ~should meet the equation:
5. The method according to claim 4, wherein said value of 0.7071 corresponds to an in-phase or quadrature component of Quadrature Phase Shift Keying base band modulation with average constellation power being 1.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/CN2005/001708 WO2007045122A1 (en) | 2005-10-18 | 2005-10-18 | A soft demodulating method for 16qam in communication system |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2625111A1 true CA2625111A1 (en) | 2007-04-26 |
CA2625111C CA2625111C (en) | 2011-10-04 |
Family
ID=37962174
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA2625111A Expired - Fee Related CA2625111C (en) | 2005-10-18 | 2005-10-18 | A soft demodulating method for 16qam in communication system |
Country Status (3)
Country | Link |
---|---|
CN (1) | CN101176325B (en) |
CA (1) | CA2625111C (en) |
WO (1) | WO2007045122A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9172500B2 (en) | 2012-04-17 | 2015-10-27 | Huawei Technologies Co., Ltd. | Signal demodulation method and device |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5145766B2 (en) * | 2007-05-21 | 2013-02-20 | 株式会社Jvcケンウッド | Soft decision device and soft decision method |
RU2713206C1 (en) * | 2019-03-29 | 2020-02-04 | Акционерное Общество Научно- Производственный Концерн "Барл" | Signal demodulation method and device |
CN111953446B (en) * | 2019-05-14 | 2023-05-16 | 中兴通讯股份有限公司 | Soft information hard decision configuration method, device, equipment and readable storage medium |
CN111131107B (en) * | 2019-12-04 | 2022-03-11 | 重庆邮电大学 | Self-adaptive soft demodulation method based on 5G downlink shared channel state |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6735247B2 (en) * | 2001-03-30 | 2004-05-11 | Qualcomm, Incorporated | Method and apparatus in a communication system |
KR100800885B1 (en) * | 2001-08-13 | 2008-02-04 | 삼성전자주식회사 | Demodulation apparatus and method for communication using multi level modulation |
US7580480B2 (en) * | 2003-06-23 | 2009-08-25 | Hong-seok Seo | Demodulation method using soft decision for quadrature amplitude modulation and apparatus thereof |
CN100518163C (en) * | 2005-04-01 | 2009-07-22 | 东南大学 | Method for fast realization of soft-demodulation and soft-modulation in high-order quadrature amplitude modulation |
-
2005
- 2005-10-18 WO PCT/CN2005/001708 patent/WO2007045122A1/en active Application Filing
- 2005-10-18 CN CN2005800497901A patent/CN101176325B/en not_active Expired - Fee Related
- 2005-10-18 CA CA2625111A patent/CA2625111C/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9172500B2 (en) | 2012-04-17 | 2015-10-27 | Huawei Technologies Co., Ltd. | Signal demodulation method and device |
Also Published As
Publication number | Publication date |
---|---|
CN101176325A (en) | 2008-05-07 |
CA2625111C (en) | 2011-10-04 |
WO2007045122A1 (en) | 2007-04-26 |
CN101176325B (en) | 2011-02-02 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US8442158B2 (en) | Method for digital wireless communications | |
US7483497B2 (en) | Method and apparatus for calculating log-likelihood ratio for decoding in a receiver for a mobile communication system | |
KR100611507B1 (en) | Blind detection method and apparatus, and mobile communication receiver having the same | |
US20070058741A1 (en) | Demodulation apparatus and demodulation method | |
CA2625111A1 (en) | A soft demodulating method for 16qam in communication system | |
US20070058756A1 (en) | Reduced complexity soft output demapping | |
CN101938333B (en) | Gray code pi/ M-MPSK modulating soft bit information calculation method | |
CN113411279B (en) | Reusable Q power demapping method and system based on DVB-S2 system | |
US8204157B2 (en) | Wireless communications device for signal with selected data symbol mapping and related methods | |
JP4409722B2 (en) | Wireless transmission apparatus and wireless transmission method | |
JP3233092B2 (en) | Modulation system and wireless communication system using the same | |
JP3779311B2 (en) | Modulation method and wireless communication system | |
WO2002065722A1 (en) | Digital modulation system, radio communication system, radio communication device | |
JP3489574B2 (en) | Receiver | |
US9313061B2 (en) | Wireless communication system using selective mapping for memory-less demodulation and related methods | |
EP1453266A1 (en) | Modulation method in a TETRA communication system | |
KR970000163B1 (en) | Modulator and demodulator in tdma | |
JP2015186246A (en) | Communication system, transmitter, and receiver | |
JP2004007785A (en) | Modulation system and transmitter | |
JP2006060870A (en) | Modulation method and wireless communication system | |
JP2004007786A (en) | Receiver |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKLA | Lapsed |
Effective date: 20201019 |