CA2406757A1 - System and method for peak power reduction in spread spectrum communications systems - Google Patents
System and method for peak power reduction in spread spectrum communications systems Download PDFInfo
- Publication number
- CA2406757A1 CA2406757A1 CA002406757A CA2406757A CA2406757A1 CA 2406757 A1 CA2406757 A1 CA 2406757A1 CA 002406757 A CA002406757 A CA 002406757A CA 2406757 A CA2406757 A CA 2406757A CA 2406757 A1 CA2406757 A1 CA 2406757A1
- Authority
- CA
- Canada
- Prior art keywords
- filter
- peak reduction
- spread spectrum
- input symbols
- signal
- 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
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/10—Code generation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
-
- 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
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03343—Arrangements at the transmitter end
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2614—Peak power aspects
-
- 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
- H04L27/36—Modulator circuits; Transmitter circuits
- H04L27/366—Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
- H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
- H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
- H04B2201/70706—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation with means for reducing the peak-to-average power ratio
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2614—Peak power aspects
- H04L27/2621—Reduction thereof using phase offsets between subcarriers
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Mobile Radio Communication Systems (AREA)
- Transmitters (AREA)
Abstract
A system and method for signal peak reduction in a spread spectrum communication system of the type including a filter for limiting signal bandwidth of symbols transmitted from the system. A signal peak reduction un it (122) is provided before the filter (126) the includes a filter predictor (146) that predicts the effect of that filter on input symbols by using filt er coefficient values corresponding to the filter impulse response function. Input symbols that are predicted to cause the output signal to exceed a predetermined peak limit value are adjusted. Several examples of suitable algorithms for calculating the necessary peak reduction to be applied to the input symbols are disclosed. The peak reduction unit provides adjusted symbo ls to the filter for processing and communication system output.
Applications Claiming Priority (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US19851600P | 2000-04-19 | 2000-04-19 | |
US60/198,516 | 2000-04-19 | ||
US21289200P | 2000-06-20 | 2000-06-20 | |
US60/212,892 | 2000-06-20 | ||
US09/746,167 | 2000-12-22 | ||
US09/746,167 US6449302B2 (en) | 2000-04-19 | 2000-12-22 | System and method for peak power reduction in spread spectrum communications systems |
PCT/US2001/006317 WO2001082547A1 (en) | 2000-04-19 | 2001-02-28 | System and method for peak power reduction in spread spectrum communications systems |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2406757A1 true CA2406757A1 (en) | 2001-11-01 |
CA2406757C CA2406757C (en) | 2004-03-23 |
Family
ID=27393889
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002406757A Expired - Fee Related CA2406757C (en) | 2000-04-19 | 2001-02-28 | System and method for peak power reduction in spread spectrum communications systems |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1281262A4 (en) |
KR (1) | KR100466057B1 (en) |
CN (1) | CN1284345C (en) |
AU (1) | AU2001241825A1 (en) |
CA (1) | CA2406757C (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4287225B2 (en) * | 2003-09-18 | 2009-07-01 | 株式会社日立国際電気 | Transmitter |
JP4871813B2 (en) * | 2007-08-28 | 2012-02-08 | 株式会社日立製作所 | Wireless communication device, wireless communication method, and peak suppression method |
GB2483290B (en) * | 2010-09-03 | 2015-07-22 | Nvidia Technology Uk Ltd | Transmitting a signal from a power amplifier |
EP2940866B1 (en) * | 2014-04-30 | 2021-12-08 | Nxp B.V. | Rf switch circuit |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5418813A (en) * | 1993-12-06 | 1995-05-23 | Motorola, Inc. | Method and apparatus for creating a composite waveform |
US6049535A (en) * | 1996-06-27 | 2000-04-11 | Interdigital Technology Corporation | Code division multiple access (CDMA) communication system |
JP3311950B2 (en) * | 1996-12-19 | 2002-08-05 | 富士通株式会社 | Code multiplex radio equipment |
JP3462388B2 (en) * | 1998-04-28 | 2003-11-05 | 松下電器産業株式会社 | Wireless communication device |
-
2001
- 2001-02-28 KR KR10-2002-7014082A patent/KR100466057B1/en not_active IP Right Cessation
- 2001-02-28 EP EP01913130A patent/EP1281262A4/en not_active Withdrawn
- 2001-02-28 AU AU2001241825A patent/AU2001241825A1/en not_active Abandoned
- 2001-02-28 CA CA002406757A patent/CA2406757C/en not_active Expired - Fee Related
- 2001-02-28 CN CNB018082831A patent/CN1284345C/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
AU2001241825A1 (en) | 2001-11-07 |
KR20020089512A (en) | 2002-11-29 |
CN1425242A (en) | 2003-06-18 |
CA2406757C (en) | 2004-03-23 |
KR100466057B1 (en) | 2005-01-13 |
CN1284345C (en) | 2006-11-08 |
EP1281262A4 (en) | 2008-09-10 |
EP1281262A1 (en) | 2003-02-05 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2001099293A3 (en) | System and method for peak power reduction in multiple carrier communications systems | |
MY130207A (en) | Method and apparatus for power estimation in a communication system. | |
KR950007328A (en) | Direct Sequence Code Division Multiple Access Communication Systems and Receivers for the Systems | |
MY124192A (en) | Variable bandwidth spread spectrum device | |
EP0729254A3 (en) | Fractionally spaced equalizing circuits and method | |
TW332280B (en) | Apparatus for compressing a digital input signal | |
CA2138810A1 (en) | Method of and Apparatus for Identifying a System with Adaptive Filter | |
AU4320197A (en) | Frequency-voltage conversion circuit, delay amount judgement circuit, system having frequency-voltage conversion circuit, method of adjusting input/output characterictics of frequency-voltage conversion circuit, and apparatus for automatically adjusting input/output | |
CA2161356A1 (en) | System Identification Method and Apparatus by Adaptive Filter | |
WO2005006631A3 (en) | Methods and apparatus for controlling signals | |
WO2003036874A3 (en) | Communication system | |
IL155629A0 (en) | Method and apparatus for reducing transmission power in a high data rate system | |
WO2004095760A3 (en) | Audio data processing systems and methods utilizing high oversampling rates | |
AU2001252567A1 (en) | Matched filter and receiver for mobile radio communication system | |
CA2406757A1 (en) | System and method for peak power reduction in spread spectrum communications systems | |
US5583887A (en) | Transmission signal processing apparatus | |
CA2220507A1 (en) | Data transmission system with a low peak-to-average power ratio based on distorting frequently occurring signals | |
JPS6393233A (en) | Spread spectrum communication system | |
JP3702829B2 (en) | Peak factor reduction device | |
WO2003039060A3 (en) | Apparatus and method to generate an adaptive threshold for a data slicer | |
TW200420011A (en) | Insertion sorter | |
WO2004040789A3 (en) | Cascade filter receiver for ds-cdma communication systems | |
MY132297A (en) | Method for processing a digital signal in a so-called secure communication system and use of this method for access control and/or binary signature | |
IL147792A0 (en) | Estimating interference in a communication system | |
EP0253583A2 (en) | Adaptive digital filter |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKLA | Lapsed |
Effective date: 20190228 |
|
MKLA | Lapsed |
Effective date: 20190228 |