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6 28 mô hình thông tin vệ tinh

Bài giảng môn hệ THỐNG VIỄN THÔNG

Bài giảng môn hệ THỐNG VIỄN THÔNG

Kĩ thuật Viễn thông

... 0,038 0, 060 0,091 0,193 0,208 0,323 0,503 0,710 0, 862 0,954 0,995 0,995 Bc súng (nm) 570 585 595 60 0 61 0 62 1 63 0 64 0 65 0 66 0 67 0 68 0 69 0 700 710 720 23 trng tng i 0,952 0,870 0,757 0 ,63 1 0,503 ... l thu tinh th cong ca hai mt thu tinh th cú th thay i c nh s co gión ca c nú Hỡnh 1.8 Cu to s lc mt ng trc thu tinh th l mt cht lng sut, cú chit sut n = 1,333 gi l thu dch ng sau thu tinh th ... ca tin cng ln , tin cng cú ý ngha, lng tin ca xi cng ln Khi 1/p(i) cng , thỡ p(i) cng ln , bt ng ca tin cng , tin cng ớt cú ý ngha, lng tin ca xi cng Khi p(i) = , thỡ bt ng ca tin = , tin...
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Báo cáo hóa học:

Báo cáo hóa học: " Bounds on the Outage-Constrained Capacity Region of Space-Division Multiple-Access Radio Systems" docx

Báo cáo khoa học

... 7, pp 27 96 281 5, 1998 [7] S V Hanly and D N C Tse, “Part II: Multiaccess fading channels II Delay-limited capacities,” IEEE Transactions on Information Theory, vol 44, no 7, pp 28 16 283 1, 1998 ... USA, 1 968 [5] E Biglieri, J Proakis, and S Shamai, “Fading channels: information-theoretic and communications aspects,” IEEE Transactions on Information Theory, vol 44, no 6, pp 261 9– 269 2, 1998 ... can be explained by noting that a large number of antenna elements at the base station is very efficient at combating severe fading, thereby keeping the allowable transmitting rates relatively...
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Code Division Multiple Access (CDMA) phần 6 docx

Code Division Multiple Access (CDMA) phần 6 docx

Hóa học - Dầu khí

... MOBK023-Buehrer.cls September 28, 20 06 15:55 CELLULAR CODE DIVISION MULTIPLE ACCESS 103 Slow Rayleigh fading channel 10 -1 10 -2 10 0.2 0.4 0 .6 0.8 1.2 1.4 1 .6 1.8 1.2 1.4 1 .6 1.8 1.2 1.4 1 .6 1.8 Transmit power ... 104 September 28, 20 06 15:55 CODE DIVISION MULTIPLE ACCESS (CDMA) Fast Rayleigh fading channel 10 -1 10 -2 10 0.2 0.4 0 .6 0.8 1.2 1.4 1 .6 1.8 1.2 1.4 1 .6 1.8 1.2 Time (sec) 1.4 1 .6 1.8 Transmit ... MOBK023-Buehrer.cls 102 September 28, 20 06 15:55 CODE DIVISION MULTIPLE ACCESS (CDMA) AWGN channel 1.5 0.5 0 0.1 0.2 0.3 0.4 0.5 0 .6 0.7 0.8 0.9 0 .6 0.7 0.8 0.9 0 .6 0.7 0.8 0.9 Transmit power 1.5...
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Báo cáo hóa học:

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

Báo cáo khoa học

... of CDMA with random spreading,” IEEE Transactions on Information Theory, vol 45, no 2, pp 62 2 64 0, 1999 [6] A J Viterbi, “Very low rate convolutional codes for maximum theoretical performance of ... in Proceedings of IEEE Global Telecommu- [15] [ 16] [17] [18] [19] [20] [21] [22] [23] [24] [25] [ 26] nications Conference (GLOBECOM ’05), vol 6, pp 3513–3517, St Louis, Mo, USA, November-December ... sequence,” in Proceedings of IEEE Global Telecommunication Conference (GLOBECOM ’99), vol 4, pp 2 162 –2 166 , Rio de Janeiro, Brazil, December 1999 A J Weiss and B Friedlander, “Channel estimation for...
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Code Division Multiple Access CDMA pdf

Code Division Multiple Access CDMA pdf

Hóa học - Dầu khí

... 165 5 .6. 2 Performance in an Additive White Gaussian Noise Channel 167 5 .6. 3 Multipath Fading and Rake Reception 168 5 .6. 4 Voice activity, ... 160 5.5.4 Timing Estimation Errors 161 5 .6 Application Example: IS-95 162 5 .6. 1 Parallel Interference ... September 28, 20 06 15:54 Simpo PDF Merge and Split Unregistered Version - http://www.simpopdf.com CODE DIVISION MULTIPLE ACCESS (CDMA) R7,8 R9,11 R45 ,62 0 .6 0.4 0.2 Cross-correlation 32 0.2 0.4 0 .6 −20...
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Code Division Multiple Access (CDMA) phần 1 doc

Code Division Multiple Access (CDMA) phần 1 doc

Hóa học - Dầu khí

... 165 5 .6. 2 Performance in an Additive White Gaussian Noise Channel 167 5 .6. 3 Multipath Fading and Rake Reception 168 5 .6. 4 Voice activity, ... 160 5.5.4 Timing Estimation Errors 161 5 .6 Application Example: IS-95 162 5 .6. 1 Parallel Interference ... 46 2.5.3 Impact of Bandwidth 54 P1: IML/FFX MOBK023-FM P2: IML/FFX QC: IML/FFX MOBK023-Buehrer.cls T1: IML September 28, 20 06 15:54 CONTENTS 2.6...
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Code Division Multiple Access (CDMA) phần 2 doc

Code Division Multiple Access (CDMA) phần 2 doc

Hóa học - Dầu khí

... 10 Rearranging, we have ≤ 3Q (1. 16) √ ∗ 101.8 = 6. 48 Q≥ (1.17) P1: IML/FFX P2: IML/FFX MOBK023-01 MOBK023-Buehrer.cls 12 QC: IML/FFX T1: IML September 28, 20 06 15:54 CODE DIVISION MULTIPLE ACCESS ... = D8 = · · · = D12 = 2D Thus, we have SIR = √ 3Qdr √ κ 3Q = + 6/ 2κ −κ dr−κ √ + 3Qdr −κ (1.20) which leads to Q= + 6/ 24 ∗ 101.8 = 6. 68 (1.21) Clearly, including the second tier of interferers makes ... P2: IML MOBK023-Buehrer.cls 26 September 28, 20 06 15:54 CODE DIVISION MULTIPLE ACCESS (CDMA) It can be seen that the chip rate is N times that of the bit rate, resulting in a signal whose bandwidth...
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Code Division Multiple Access (CDMA) phần 3 potx

Code Division Multiple Access (CDMA) phần 3 potx

Hóa học - Dầu khí

... R9,11 R45 ,62 0 .6 0.4 0.2 Cross-correlation P1: IML/FFX MOBK023-02 0.2 0.4 0 .6 −20 −15 −10 −5 Delay (chips) 10 15 20 FIGURE 2 .6: Example cross-correlation functions for Walsh codes of length 64 for ... 2 .6 The cross-correlation is plotted for various Walsh codes of length 64 We can see that only at zero delay (i.e., n = 0) we obtain Ri, j n = P2: IML MOBK023-Buehrer.cls 32 September 28, 20 06 ... 28, 20 06 15:54 SPREAD SPECTRUM TECHNIQUES FOR CODE DIVISION MULTIPLE ACCESS 33 TABLE 2.1: Code length N and the number of m-sequences Np (n) n 10 N = 2n − 15 31 63 127 255 511 1023 Np (n) 2 6...
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Code Division Multiple Access (CDMA) phần 4 pdf

Code Division Multiple Access (CDMA) phần 4 pdf

Hóa học - Dầu khí

... September 28, 20 06 15:54 CODE DIVISION MULTIPLE ACCESS (CDMA) 10 K=1 K = 10 K = 20 K = 30 K = 40 -1 10 -2 10 Probability of bit error 62 -3 10 -4 10 -5 10 -6 10 10 Eb/No (dB) 12 14 16 18 20 FIGURE ... Probability of bit error P1: IML/FFX MOBK023-02 -3 10 -4 10 N = 16 N = 32 N = 64 N = 128 -5 10 -6 10 10 15 20 25 Users 30 35 40 45 FIGURE 2 .28: Probability of bit error of DS/SS CDMA versus the number ... Figure 2. 26, we can write I j,k = Pj cos(φ j ) N−1 N−1 ¨ a j,l−1−χ j a k,l + (Tc − j l=0 ¨ a j,l−χ j a k,l j) l=0 (2 .68 ) P1: IML/FFX MOBK023-02 P2: IML MOBK023-Buehrer.cls September 28, 20 06 15:54...
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Code Division Multiple Access (CDMA) phần 5 ppt

Code Division Multiple Access (CDMA) phần 5 ppt

Hóa học - Dầu khí

... the SIR is −110dBm + 130dBm = 20dB and the standard deviation √ is + 36 = 6. 08dB Converting to base e , 20 ln (10) 10 = 4 .61 6. 08 ln (10) σ = 10 = 1.40 μ= (3.2) (3.3) Now we wish to find X such ... IML MOBK023-Buehrer.cls 74 September 28, 20 06 15:55 CODE DIVISION MULTIPLE ACCESS (CDMA) 0.02 signals signals 20 signals 0.018 0.0 16 0.014 0.012 0.01 0.008 0.0 06 0.004 0.002 0 500 1000 1500 Total ... IML/FFX MOBK023-02 P2: IML MOBK023-Buehrer.cls September 28, 20 06 15:54 72 P1: IML/FFX MOBK023-03 P2: IML MOBK023-Buehrer.cls September 28, 20 06 15:55 73 CHAPTER Cellular Code Division Multiple Access...
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Code Division Multiple Access (CDMA) phần 7 pps

Code Division Multiple Access (CDMA) phần 7 pps

Hóa học - Dầu khí

... Specifically, lim ηUL = (3 .66 a) ηUL = (3 .66 b) Itotal →∞ lim (Iic +Io c )→0 P2: IML MOBK023-Buehrer.cls 108 September 28, 20 06 15:55 CODE DIVISION MULTIPLE ACCESS (CDMA) Now, rearranging (3 .64 ), we can write ... occurring simultaneously Node is transmitting on the common code, Node is transmitting on Code 2, Node is transmitting on Code 4, and Node is transmitting on the common code Node is listening ... P1: IML/FFX MOBK023-04 P2: IML MOBK023-Buehrer.cls 1 16 September 28, 20 06 15:55 CODE DIVISION MULTIPLE ACCESS (CDMA) Synchronization Destination Source address address header Spread with receiver's...
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Code Division Multiple Access (CDMA) phần 8 potx

Code Division Multiple Access (CDMA) phần 8 potx

Hóa học - Dầu khí

... MOBK023-04 P2: IML MOBK023-Buehrer.cls September 28, 20 06 15:55 1 26 P1: IML/FFX MOBK023-05 P2: IML MOBK023-Buehrer.cls September 28, 20 06 15: 56 127 CHAPTER Multiuser Detection As discussed in ... MOBK023-Buehrer.cls 128 September 28, 20 06 15: 56 CODE DIVISION MULTIPLE ACCESS (CDMA) represented as K s k (t − τk ) + n(t) r (t) = (5.1) k=1 where K users are independently transmitting bi-phase modulated ... MOBK023-Buehrer.cls September 28, 20 06 15: 56 MULTIUSER DETECTION 10−1 Probability of bit error 10−2 10−3 10−4 Matched filter Decorrelator MMSE Decorrelating decision feedback 0.1 0.2 0.3 0.4 0.5 ρ 0 .6 0.7 0.8 0.9...
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Code Division Multiple Access (CDMA) phần 9 docx

Code Division Multiple Access (CDMA) phần 9 docx

Hóa học - Dầu khí

... effect is mitigated, resulting in a reduced signal strength variance P1: IML/FFX MOBK023-05 P2: IML MOBK023-Buehrer.cls September 28, 20 06 15: 56 MULTIUSER DETECTION 161 10 -1 Probability of error ... MOBK023-05 P2: IML MOBK023-Buehrer.cls 154 September 28, 20 06 15: 56 CODE DIVISION MULTIPLE ACCESS (CDMA) There are two typical techniques for implementing partial or selective cancellation The first ... MOBK023-Buehrer.cls September 28, 20 06 15: 56 MULTIUSER DETECTION 10 Probability of Bit Error 10 10 155 Matched Filter Stage PIC Stage PIC Stage Partial Stage Partial 10 10 20 30 40 50 Users 60 70 80 90 FIGURE...
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Code Division Multiple Access (CDMA) phần 10 pot

Code Division Multiple Access (CDMA) phần 10 pot

Hóa học - Dầu khí

... September 28, 20 06 15: 56 MULTIUSER DETECTION 169 Probability of bit error 10-1 10-2 10 -3 0-stage 1-stage 2-stage 3-stage 6- stage Single-user bound 10-4 10 20 30 40 Number of active users 50 60 FIGURE ... September 1998.doi:10.1109/35.71 461 6 [ 26] T Kasami, “Weight distribution formula for some class of cyclic codes,” University of Illinois – Urbana, Tech Rep R -285 , April 1 966 [27] L R Welch, “Lower bounds ... IEEE Journal on Selected Areas in Communications, vol 12, pp 580–592, May 1994.doi:10.1109/49.2 866 65 [66 ] Z Zvonar and D Brady, “Multiuser detection in single-path fading channels,” IEEE Transactions...
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BÀI BÁO CÁO -Công nghệ WCDMA(wideband code division multiple access) và tình trạng triển khai

BÀI BÁO CÁO -Công nghệ WCDMA(wideband code division multiple access) và tình trạng triển khai

Cao đẳng - Đại học

... kiện phòng kín Tình hình triển khai HSDPA Theo số liệu Nghiệp đoàn di động toàn cầu (GSA) công nghệ 3,5G (HSDPA) chiếm đến 69 % tổng số mạng di động toàn cầu Nếu 20 06, có 166 mạng di động hỗ trợ ... phát với phần cuối khác dòng thông tin sau lại dùng nhiều anten thu ưu điểm trình xử lý tín hiệu thiết bị đầu cuối để chia sẻ dòng khác với nguyên lý tả hình 2 .6 Thử thách chứng minh ảnh hưởng ... thu thực cải tiến chạy Re 6 hay khả khác để cải tiến dung lượng đưa vào bên phát ví dụ việc từ cấu hình thành phần đến cấu hình thành phần Nhưng kết không nằm dự báo 3GPP môi trường macro-cell HSDPA...
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Thuyết trình Orthogonal Frequency Division Multiple Access in WiMAX and LTE A Comparison

Thuyết trình Orthogonal Frequency Division Multiple Access in WiMAX and LTE A Comparison

Cao đẳng - Đại học

... SYNCHRONIZATION AND CHANNEL ESTIMATION EVOLUTION OF WIMAX AND LTE Nhóm CONCLUSION INTRODUCTION - IEEE 802.16e-based WiMAX and Third Generation Partnership Project (3GPP)-based Long Term Evolution (LTE) are ... Different modes of channel feedback - Channel feedback can be sent as one value for the entire operating the entire bandwidth - In LTE both can be used Nhóm bandwidth or as a sequence of values for ... transmitted at the start of every frame - In LTE, the frame synchronization is obtained by detecting the primary - The preamble signal is generated by using every third subcarrier in the synchronization...
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Tiểu luận Orthogonal Frequency Division Multiple Access in WiMAX and LTE A Comparison

Tiểu luận Orthogonal Frequency Division Multiple Access in WiMAX and LTE A Comparison

Cao đẳng - Đại học

... thống thông tin, cần biết tính chất kênh phát (PBCH), có thông tin băng thông tín hiệu LTE Thông điệp PBCH chiếm 1,08 MHz phần trung tâm rộng lớn truyền băng thông Để kích hoạt tính đáng tin cậy ... (PDCCH) thông tin, truyền đạt thông tin phân bổ tới điện thoại di động Một liên kết lỏng nhiều tin nhắn, tín hiệu WiMAX LTE trình bày bảng Thông tin Khung thời gian biểu tượng, đồng hóa tần số, thông ... xuống Các thông tin phản hồi định kỳ, máy di động gửi thông tin phản hồi kênh kênh điều khiển riêng biệt khoảng thời gian thường xuyên xác định trước Chu kỳ tối đa tối thiểu truyền thông tin phản...
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Interleaved frequency division multiple access with multiple antennas and block spreading for mobile broadband communications

Interleaved frequency division multiple access with multiple antennas and block spreading for mobile broadband communications

Anh văn thương mại

... 47 2 .6. 3 Effects of Varying Number of Paths to Keep in Each Stage 48 2 .6. 4 Varying Number of Channel Paths 48 2 .6. 5 Multiple Receive Antennas System 50 2 .6. 6 Spatial ... 101 4 .6 Simulation Results 108 4 .6. 1 4 .6. 2 Channel Dependent Code Assignment 109 4 .6. 3 System BER with High Mobility Users 110 4 .6. 4 4.7 Simulation ... Diversity 61 3.2.3 Combining Cyclic Delay Diversity and Antenna Spreading Diversity 63 iii 3.3 Theoretical Performance Analysis 66 3.4 Simulation...
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Inter carrier interference suppression in orthogonal frequency division multiple access (OFDMA) systems uplink

Inter carrier interference suppression in orthogonal frequency division multiple access (OFDMA) systems uplink

Cao đẳng - Đại học

... Algorithms 56 4.3.3 Frequency-domain Estimation 58 4.4 CRLB Analysis for LS Estimators 63 4.5 Numerical Results and Discussion 66 4.5.1 Performance of ... Fig.4 .6: Samples selection for channel estimation from FFT-demodulated OFDMA block 62 Fig.4.7: MSE performance of LS-T and LMMSE 68 Fig.4.8: Comparison between LS-T and LS-F 69 ... Signaling 76 5.2 Signature Vector-based Multiuser Detection 81 5.2.1 Matched Filtering 82 5.2.2 Zero Forcing 84 5.2.3 MMSE 86 5.2.4 Performance...
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