code division multiple access ppt
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 ... contention-free multiple access is in how the channels are defined. In time division multiple access (TDMA), channels are defined according to time slots. In frequency division multiple access (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
... 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 ... 22 2. Spread Spectrum 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 ... 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
... 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 (CDMA) communi- cations. ... of Code Division Multiple Access Communication, by Kamil Sh. Zigangirov ISBN 0-471-45712-4 Copyright 2004 Institute of Electrical and Electronics Engineers 1 THEORY OF CODE DIVISION MULTIPLE ... 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 available band- width...
Ngày tải lên: 01/06/2014, 11:27
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 ... multiple access capacity for Beyond 3G,” IEEE Communications Magazine, vol. 43, no. 1, pp. 61–69, 2005. [10] J. C. Fricke, H. Schoeneich, and P. A. Hoeher, “An interleave- division multiple access ... Liu, K. Wu, and W. Leung, “Interleave -division multiple- access (IDMA) communication systems,” in Proceed- ings of the 3rd International Symposium on Turbo Codes & Re- lated Topics, pp. 173–180,...
Ngày tải lên: 22/06/2014, 23:20
Báo cáo hóa học: " Bounds on the Outage-Constrained Capacity Region of Space-Division Multiple-Access Radio Systems" docx
... multiple- access system with multiple antennas at the base station. Most previous studies are constrained to either fixed channel condition [11, 12] or ergodic capacity region [13]. The space -division ... 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 been studied in ... acampora@ece.ucsd.edu Received 30 May 2003; Revised 5 February 2004 Space -division multiple- access (SDMA) systems that employ multiple antenna elements at the base station can provide much higher...
Ngày tải lên: 23/06/2014, 01:20
báo cáo hóa học:" Decentralized estimation over orthogonal multiple- access fading channels in wireless sensor networks-- optimal and suboptimal estimators" ppt
... (2008) 28 which codebook is denoted as C tn . We consider BPSK modulati on for all codebooks. Because the code length of the uncoded transmission is shorter than that of the coded transmission, ... cyclic redundancy check (CRC) codes with generation polynomial G(x) = x 4 +x+1, as an example of the coded transmission. The codebook is denoted as C tc . For comparison, uncoded transmission is also ... for example, when the natural binary code and BPSK are applied to r e pr e s ent each quantized observation and to modulate. For any c m in such a transmission codebook, defined as C tn , there exists...
Ngày tải lên: 20/06/2014, 04:20
Báo cáo hóa học: " Research Article Capacity of Time-Hopping PPM and PAM UWB Multiple Access Communications over Indoor Fading Channels" ppt
... the capacity analysis given in Section 3 for a single user to be extended to a multiple- access system. 4.1. Multiple- access interference model Asgivenin(4), the received signal is modeled as r(t) = K k=1 L l=1 a lk (t)X (k) l t ... active in the multiple- access system, the optimal PPM receiver has a complex structure that takes advantage of all receiver knowledge regarding the characteristics 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...
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
... the code, and P e (d) is the PEP defined as the probability of decoding a received sequence as a weight-d codeword given that the all- zero codeword is transmitted. In (6), w d is the number of codewordswithoutputweightd ... spread-spectrum multiple- access communications over fading channels,” IEEE Transactions on Communications, vol. 30, no. 5, part 2, pp. 996–1009, 1982. [3] G. Einarsson, “Coding for a multiple- access frequency- hopping ... 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...
Ngày tải lên: 21/06/2014, 23:20
Báo cáo hóa học: " Research Article Power and Resource Allocation for Orthogonal Multiple Access Relay Systems" pptx
... strategies. (i) Regenerative decode-and-forward (RDF). The relay decodes the message w i , re-encodes it using the same code book as the source node, and transmits the codeword to the destination ... Nonregenerative decode-and-forward (NDF). The relay decodes the message w i , re-encodes it using a different code book from that used by the source node, and transmits the codeword to the destination ... allocation for orthogonal multiple access relay (MAR) systems in order to maximize the achievable rate region. Four relaying strategies are considered; namely, regenerative decode-and-forward (RDF), nonregenerative...
Ngày tải lên: 22/06/2014, 01:20