code division multiple access of dsss
Code Division Multiple Access CDMA pdf
... 64 2.8 Multiple Access Performance of Frequency-Hopped Code Division Multiple Access 67 2.9 Summary 71 3. Cellular Code Division Multiple Access 73 3.1 Principles of Cellular Code Division Multiple ... understood orthogonal access techniques such as time division multiple access and frequency division multiple access. Additionally, random access schemes such as carrier sense multiple access are examined. In ... 15:54 6 CODE DIVISION MULTIPLE ACCESS (CDMA) FIGURE 1.3: Example of three-channel FDMA system. multipleaccess techniquessince, ideally,thereis nointerferencebetween channels. An advantage of FDMA...
Ngày tải lên: 27/06/2014, 14:20
Luận văn kỹ thuật cdma (code division multiple access) luận văn, đồ án, đề tài tốt nghiệp
Ngày tải lên: 25/07/2014, 09:39
Code Division Multiple Access (CDMA) phần 1 doc
... Techniques for Code Division Multiple Access 23 2.1 Forms of Code Division Multiple Access 23 2.2 Direct Sequence Code Division Multiple Access 24 2.2.1 Power Spectral Density of Direct Sequence ... Access Performance of Frequency-Hopped Code Division Multiple Access 67 2.9 Summary 71 3. Cellular Code Division Multiple Access 73 3.1 Principles of Cellular Code Division Multiple Access 73 3.1.1 ... Communications 1 1.1 Conflict-Free Medium Access Control 2 1.1.1 Time Division Multiple Access 3 1.1.2 Frequency Division Multiple Access 5 1.1.3 Code Division Multiple Access 6 1.1.4 Traffic Engineering...
Ngày tải lên: 07/08/2014, 21:20
BÀI BÁO CÁO -Công nghệ WCDMA(wideband code division multiple access) và tình trạng triển khai
Ngày tải lên: 02/06/2015, 17:26
theory of code division muitiple access communication
... Illustration of PPH CDMA transmission. THEORY OF CODE DIVISION MULTIPLE ACCESS COMMUNICATION 1 INTRODUCTION TO CELLULAR MOBILE RADIO COMMUNICATION The subject of this book is code division multiple access ... duplex channel actually consists of two simplex channels. Frequency division multiple access (FDMA) and time division multiple access (TDMA) are the two major access techniques used to share the ... Institute of Electrical and Electronics Engineers 1 THEORY OF CODE DIVISION MULTIPLE ACCESS COMMUNICATION Kamil Sh. Zigangirov A JOHN WILEY & SONS, INC., PUBLICATION PREFACE The objective of...
Ngày tải lên: 01/06/2014, 11:27
Báo cáo hóa học: " Bounds on the Outage-Constrained Capacity Region of Space-Division Multiple-Access Radio Systems" docx
... pro- vide a yardstick against which the p erformance of any space- division multiple- access technique can be compared. APPENDIX EVALUATION OF T 2 AND T 3 IN SECTION 3.3 Now we examine T 2 and ... the outage capacity of a MIMO system for different delay and transmit power constraints. However, there are limited results on the outage capac- ity region of multiple- access system with multiple antennas at ... proposed in [12] to maximize the sum capacity of a time invariant Gaussian MIMO multiple- access channel. The ergodic capacity region for MIMO multiple- access channel with covariance feedback has...
Ngày tải lên: 23/06/2014, 01:20
Báo cáo hóa học: " Iterative Pilot-Layer Aided Channel Estimation with Emphasis on Interleave-Division Multiple Access Systems Hendrik Schoeneich and Peter Adam Hoeher" docx
... INTRODUCTION Spread-spectrum multiple access is a popular technique al- lowing several users to share the same bandwidth at the same time. Spread spec trum is often equated with direct-sequence code- division multiple access ... Hoeher, “Adaptive 4G up- link proposal based on interleave -division multiple access, ” in Proceedings of General Assembly of International Union of Radio Science (URSI ’05), New Delhi, India, October ... obtained by using soft data symbols instead of p erfectly known pilot data. If we ex- tend the result to joint estimation of multiple channels with a combined knowledge of pilot data and soft chips (which can...
Ngày tải lên: 22/06/2014, 23:20
Báo cáo hóa học: " Research Article Iterative Fusion of Distributed Decisions over the Gaussian Multiple-Access Channel Using Concatenated BCH-LDGM Codes" potx
... addressed in the first set of simulations. This statistical behavior of the number of errors per decoded block λ motivates the inclusion of an outer sys- tematic BCH code whose error correction ... at the output of the BCH encoder is next processed through an inner LDGM code, that is, a linear code with low density generator matrix G = [IP]. The parity check matrix of LDGM codes is expressed ... number of errors per block at the output of the LDGM decoders. To this end, let CDF(λ)denote the Cumulative Density Function of the number of errors per LDGM-decoded block λ at iteration I, which...
Ngày tải lên: 21/06/2014, 07:20
Báo cáo hóa học: " Research Article Capacity of Time-Hopping PPM and PAM UWB Multiple Access Communications over Indoor Fading Channels" ppt
... system, multiaccess interference (MAI) is a major factor limiting performance and capacity, particularly for a large number of users. As shown in [8, 9], the net effect of the multiple- access interference ... Capacity of a multiple access UWB system with PAM over a multipath fading channel with L = 4, m = 0.65, K = 200, G = 100, and P x =−11 dBm. The instantaneous capacity for a multiple access UWB system ... gain of the UWB system. Note that the approximation in (32) is based on the fact that most of the energy of the Sinc function is located in [ −T f , T f ]. Hence the cross-correlator outputs of...
Ngày tải lên: 21/06/2014, 22:20
Báo cáo hóa học: " Research Article Analysis of Coded FHSS Systems with Multiple Access Interference over Generalized Fading Channels" ppt
... (6), w d is the number of codewordswithoutputweightd obtained from the weight enumerator of the code [12]. In FHSS systems, the PEP in (6) is a function of the distribution of the d nonzero bits ... minimum distance of the code. The resultant code rate after puncturing is given by R c = mR c m −1 . (34) Ta bl e 1 shows the code rates and the minimum distances of the punctured codes for different ... Article Analysis of Coded FHSS Systems with Multiple Access Interference over Generalized Fading Channels Salam A. Zummo Department of Electrical Engineering, King Fahd University of Petroleum and...
Ngày tải lên: 21/06/2014, 23:20
Báo cáo hóa học: " Research Article Slotted Gaussian Multiple Access Channel: Stable Throughput Region and Role of Side Information" pdf
... allocation of code rates and thus suffer from additional “overhead” of indicating the number of encoded bits in every codeword. If we reduce the information, we may not have the same knowledge of the ... the impact of such side information regarding the traffic on the stability performance of Gaussian multiple- access channels. We will focus our attention on a slotted Gaussian multiple- access channel ... two approaches is the definition of stability. The definition of stability in the case of infinite block length means that the queue length has to be finite multiple of block-length with probability...
Ngày tải lên: 21/06/2014, 23:20