'Pn code' presentation slideshows

Terms

Multiplexing and Multiple Access ??????? ? ? ? ?? ? ???? ?????? ??? ????? ??? ??? ????? ?? ?? , ??? ??? ???? ??? ??????. Terms. Multiplexing Communication resource(CR) sharing is fixed or slowly changing Resource allocation is assigned a priori(mixing user information before transmission)

1.23k views • 104 slides

Business & Engineering

715 views • 60 slides

Introduction to Mobile Communications

Introduction to Mobile Communications. TCOM 552, Lecture #8 Hung Nguyen, Ph.D. 30 October, 2006. Outline. 2G CDMA Advantages and disadvantages RAKE Receiver Logical Channels Capacity Improvement 3G CDMA Preliminaries W-CDMA CDMA 2000. IS-95 CDMA. 1.25 MHz.

604 views • 38 slides

Multi-carrier CDMA

Multi-carrier CDMA. Outlines. Introduction Family of multi-carrier CDMA Systems MC-CDMA System Multi-carrier DS-CDMA System Multi-tone CDMA System System features comparison Differences between OFDM and MC-CDMA. Introduction. 1/3. Transmit high data rate in a mobile environment

1.25k views • 36 slides

OFDMA SYSTEM Mobile WiMAX 802.16e and Next Generation PHS

OFDMA SYSTEM Mobile WiMAX 802.16e and Next Generation PHS. Fire Tom Wada Professor, Information Engineering, Univ. of the Ryukyus. New Broadband Wireless Access Service in Japan. Japan government assigned 2.5GHz BWA bands to Two Companies on 2007/December. UQ communications (KDDI)

499 views • 33 slides

Invisible Traceback in the Internet

Invisible Traceback in the Internet. Dong Xuan Department of Computer Science and Engineering The Ohio-State University. ???. ???. ???. ??. ??. ??. ??. Traceback in the Real World. Animal traceback. Family traceback. Mail traceback. 2/32. Investigator. Evil. Evil.

491 views • 32 slides

Frank Stocklin Ron Vento Bob Summers May 17 2002

Frank Stocklin Ron Vento Bob Summers May 17 2002. Micro-Arcsecond Imaging Mission, Pathfinder (MAXIM-PF). Data Systems. Data Systems Topics. Ops Concept Driving Requirements and Assumptions Selected Configuration and Rationale Signal Margin Summary Component Power/Mass/Cost Summary

436 views • 32 slides

Wireless Communications

Wireless Communications. Understanding Radio Frequency Communications. Objectives. List the components of a radio system Describe how different factors affect the design of a radio system Explain the radio frequency spectrum . Components of a Radio System. Components include: Filters

852 views • 30 slides

Contents

TD-SCDMA Principle Part C: Physical layer of TD-SCDMA Dr. Shihe Li e-mail: lish@pub.tdscdma.com Datang MobileCo. Contents. Part C: Physical layer of TD-SCDMA Review Basic technologies in Physical layer Frame Structure Power and synchronization control Cell search Handover Continue.

482 views • 30 slides

Lecture 03 Spread Spectrum(CDMA Code)

Lecture 03 Spread Spectrum(CDMA Code). By Engr. Muhammad Ashraf Bhutta. CDMA Codes. Orthogonal Codes. Pseudo-noise (PN) Codes. Walsh Codes. Short PN Codes. Walsh Codes. Long PN Code. Short PN Codes. Codes in CDMA. Walsh Codes are Orthogonal codes,. as they have. cross-correlation.

586 views • 29 slides

Suppose we have 3 bit sequences m1, m2 and m3 for 3 different sources

Suppose we have 3 bit sequences m1, m2 and m3 for 3 different sources. These 3 bit streams are spreaded seperately by 3 orthogonal codes given by w1, w2 and w3 respectively,. 1. 1. -1. -1. -1. Spread Process. Digital Signal. Spreading Signal. 1. -1. -1. 1. 1. Spreading. 1. -1. 1.

277 views • 17 slides

Cellular Communication

Cellular Communication ECE 457 Spring 2005 Cellular Phone System The cellular phone service area is divided into smaller geographical areas called cells. Cellular phone system Each cell has a base station with a tower which receives and transmits signals.

1.05k views • 16 slides

Cellular Communication

Cellular Communication. ECE 457 Spring 2005. Cellular Phone System. The cellular phone service area is divided into smaller geographical areas called cells. Cellular phone system. Each cell has a base station with a tower which receives and transmits signals.

415 views • 16 slides

A Modified Non Coherent PN Code Acquisition Scheme

A Modified Non Coherent PN Code Acquisition Scheme. Rethnakaran P Ubi N etics E-Mail: ratna.p@ubinetics.com , ratnu@ieee.org Joint work with P.K.Venkataraghavan PK (Synopsys Inc) and Tapan Ray (Wipro Technologies). Agenda. Acquisition Problem Existing solutions

314 views • 15 slides

Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)

Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [The Difference on PHY layer between Chinese WPAN and IEEE802.15.4-2006 ] Date Submitted: [Sept. 18, 2006 ] Source: [Liang Li ] Company: [, Vinno Technologies Inc. ]

183 views • 10 slides

IS95: 2G CDMA DIGITAL CELLULAR STANDARD

IS95: 2G CDMA DIGITAL CELLULAR STANDARD. CDMA FORWARD LINK. 20 ms frame. CC(2,1,9). User Data 9,6 kbps 4,8 kbps 2,4 kbps 1,2 kbps. 2,4 kbps 4,8 kbps 9,6 kbps 19,2 kbps. Power Control Bits. Walsh Code. 19,2 kbps. Modulo-2 Adding. MUX. Symbol Repetition. Block Interleaver. Traffic Data.

273 views • 8 slides

Mathematics of Multipath Distortion

Mathematics of Multipath Distortion. Dr. A. J. Van Dierendonck AJ Systems. Multipath Effects. Composite Signal a = Relative multipath signal amplitude d = Multipath delay in seconds C f ( t ) = Pre-correlation filtered PN Code Filtered Autocorrelation Function. Composite Discriminators.

425 views • 6 slides

Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)

Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Suggestions to CWPAN from IEEE802.15.4c Study Group] Date Submitted: [March 2007]

138 views • 6 slides