WO1999041887A1 - Codage multidimensionnel, et procede et dispositif de codage - Google Patents
Codage multidimensionnel, et procede et dispositif de codage Download PDFInfo
- Publication number
- WO1999041887A1 WO1999041887A1 PCT/JP1999/000623 JP9900623W WO9941887A1 WO 1999041887 A1 WO1999041887 A1 WO 1999041887A1 JP 9900623 W JP9900623 W JP 9900623W WO 9941887 A1 WO9941887 A1 WO 9941887A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- signal points
- signal
- area
- bits
- indicating
- Prior art date
Links
Classifications
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- 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
- H04L27/3405—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power
- H04L27/3416—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power in which the information is carried by both the individual signal points and the subset to which the individual points belong, e.g. using coset coding, lattice coding, or related schemes
- H04L27/3427—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power in which the information is carried by both the individual signal points and the subset to which the individual points belong, e.g. using coset coding, lattice coding, or related schemes in which the constellation is the n - fold Cartesian product of a single underlying two-dimensional constellation
-
- 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
- H04L27/3405—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power
- H04L27/3416—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power in which the information is carried by both the individual signal points and the subset to which the individual points belong, e.g. using coset coding, lattice coding, or related schemes
Definitions
- a multidimensional code has a higher peak power when compared with a two-dimensional code in which each signal slot is encoded independently, with the same distance between adjacent signal points.
- the average power can be reduced, more information can be accommodated under the same average power and SZN ratio restrictions.
- Figure 6 is a block diagram showing a variant of the encoder of Figure 2;
- FIG. 1 shows a schematic configuration of a transmitting section of a modem according to one embodiment of the present invention.
- the encoder 10 receives, in addition to the user information, secondary information for monitoring the line status.
- the encoder 10 converts the user information and the secondary information into a complex number indicating the position of a signal point on a two-dimensional plane.
- the band is limited by the roll-off filter 12, the carrier is multiplied by the modulator 14, converted into a passband, converted into an analog signal by the D / A converter 16, and transmitted to the transmission line.
- FIG. 2 shows a detailed configuration of the encoder 10.
- the average value of the power (distance from the origin) of 256 signal points belonging to each area is used as the representative value of the power of that area.
- the total of the representative values of the area power is calculated for each of the 64 area combinations, and eight combinations are selected in ascending order of the total value.
- X 3 Converted to 6-bit information.
- FIG. 5 shows a detailed configuration of the decoder 38.
- the input baseband signal is determined by the determiner 40 and the signal point closest to the input value is determined, and 10-bit information indicating one of 1024 signal points on the two-dimensional plane is obtained.
- the ROM 42 stores, at a memory location specified by a 10-bit address, 2-bit area information of a corresponding signal point and 8-bit information for specifying a signal point in the area.
- Ad outputs 2-bit area information and 8-bit information according to the address value.
- the 2-bit area information is parallelized in a latch 44 over three signal slots, and given to the ROM 46 as a 6-bit address.
- ROM 46 outputs 3-bit information according to the given address.
- FIG. 10 shows an example of decoding a multi-dimensional code without performing the error division.
- ROM 43 for decoding given 30 bits of ⁇ dress the ROM 43 for decoding, require ⁇ dress 2 3 ° 1. 07 X 10 ' '.
- ROM 42 in Fig. 5 is 2 '.
- FIG. 8 shows a simplified process of this subset division.
- Figure 16 shows the case of 16QAM consisting of 16 signal points for simplicity of explanation.
- a set of signal points represented by 16 black circles is divided into two subsets each consisting of 8 black circles.
- the minimum distance between signal points (black circles) in each subset is V2 times before division.
- each of the subsets of eight bullets is divided into two subsets of four bullets. By division, the minimum distance between signal points doubles.
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99902897A EP1056251A4 (en) | 1998-02-12 | 1999-02-12 | MULTI-DIMENSIONAL CODING, METHOD AND DEVICE THEREFOR |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2994198 | 1998-02-12 | ||
JP10/29941 | 1998-02-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999041887A1 true WO1999041887A1 (fr) | 1999-08-19 |
Family
ID=12290023
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1999/000623 WO1999041887A1 (fr) | 1998-02-12 | 1999-02-12 | Codage multidimensionnel, et procede et dispositif de codage |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1056251A4 (ja) |
WO (1) | WO1999041887A1 (ja) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59205860A (ja) * | 1983-04-14 | 1984-11-21 | コ−デツクス・コ−ポレ−シヨン | 変調システム |
JPH0318157A (ja) * | 1989-05-12 | 1991-01-25 | Codex Corp | 一般化された部分応答チャンネル信号化システム |
JPH04264852A (ja) * | 1990-10-01 | 1992-09-21 | American Teleph & Telegr Co <Att> | データ伝送装置および方法 |
JPH04275747A (ja) * | 1990-12-11 | 1992-10-01 | American Teleph & Telegr Co <Att> | データ送信装置、および送信された信号点によって表されるデータを復元する方法 |
JPH0730592A (ja) * | 1993-04-09 | 1995-01-31 | At & T Corp | 改良型多次元トレリス符号化通信システム |
-
1999
- 1999-02-12 WO PCT/JP1999/000623 patent/WO1999041887A1/ja not_active Application Discontinuation
- 1999-02-12 EP EP99902897A patent/EP1056251A4/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59205860A (ja) * | 1983-04-14 | 1984-11-21 | コ−デツクス・コ−ポレ−シヨン | 変調システム |
JPH0318157A (ja) * | 1989-05-12 | 1991-01-25 | Codex Corp | 一般化された部分応答チャンネル信号化システム |
JPH04264852A (ja) * | 1990-10-01 | 1992-09-21 | American Teleph & Telegr Co <Att> | データ伝送装置および方法 |
JPH04275747A (ja) * | 1990-12-11 | 1992-10-01 | American Teleph & Telegr Co <Att> | データ送信装置、および送信された信号点によって表されるデータを復元する方法 |
JPH0730592A (ja) * | 1993-04-09 | 1995-01-31 | At & T Corp | 改良型多次元トレリス符号化通信システム |
Non-Patent Citations (1)
Title |
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See also references of EP1056251A4 * |
Also Published As
Publication number | Publication date |
---|---|
EP1056251A4 (en) | 2002-11-06 |
EP1056251A1 (en) | 2000-11-29 |
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