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6 40 codec và modem

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 ... 555nm v 61 0nm, s cú sỏng 0,5 hot ng 61 0nm so vi sỏng hot ng 555 nm BNG TRNG TNG I ( = Ti bc súng 555 nm) Bc súng (nm) 410 420 430 443 450 460 470 480 490 500 510 520 530 540 550 560 trng ... phng xỏc nh ca mt ngun phỏt bc x n sc cú tn s 540 x 1012 hộc v cú cng bc x theo phng ú l 1 /68 3 oỏt trờn steradian (CGPM ln th 16, 1979) n v c bn 26 Chng : Cỏc kin thc c bn chúi cande cd/m2 la...
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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

... 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 ... example, with antenna elements, both mobiles can transmit at 0. 76 nat per second while achieve an outage probability smaller than 10% With 16 antenna elements at the base station, both mobiles can transmit ... second with an outage probability smaller than 1%; with 16 antenna elements at the base station, the mobiles can simultaneously transmit at 2 .65 nat per second with an outage probability smaller...
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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 ... 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 power ... 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 0.5...
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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 ... = 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...
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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 ... . 56 2 .6. 1 Gaussian Approximation 57 2 .6. 2 Improved Gaussian Approximation 64 Link Performance of...
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Code Division Multiple Access (CDMA) phần 2 doc

Code Division Multiple Access (CDMA) phần 2 doc

Hóa học - Dầu khí

... = 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 ... 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 ... MOBK023-Buehrer.cls T1: IML September 28, 20 06 15:54 MULTIUSER COMMUNICATIONS 15 0.9 Probability that SIR > abcissa 0.8 0.7 0 .6 0.5 0.4 0.3 TDMA CDMA 0.2 0.1 0 10 15 20 25 SIR 30 35 40 45 50 FIGURE 1.5: Empirical...
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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 ... 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 18 16 ... 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, 2006...
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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 ... MOBK023-Buehrer.cls 56 September 28, 20 06 15:54 CODE DIVISION MULTIPLE ACCESS (CDMA) 0.9 0.8 B B B B B B = = = = = = CW tone 25 MHz 100 MHz 225 MHz 400 MHz 500 MHz 0.7 0 .6 CDF P1: IML/FFX MOBK023-02 ... MOBK023-Buehrer.cls September 28, 20 06 15:54 SPREAD SPECTRUM TECHNIQUES FOR CODE DIVISION MULTIPLE ACCESS 55 −3 ×10 CW 25 MHz 100 MHz 225 MHz 400 MHz 500 MHz 1.8 1 .6 1.4 1.2 0.8 0 .6 0.4 0.2 0 0.5 1.5 2.5...
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Code Division Multiple Access (CDMA) phần 5 ppt

Code Division Multiple Access (CDMA) phần 5 ppt

Hóa học - Dầu khí

... −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 that Pr{SIR ... 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 interference ... perform all calculations in base 10 The probability that the SNR exceeds 6dB is Pr{SIR} ≥ 1 06/ 10 = − Q = − Q (1.15) = 0.88 μ 6 σ (3.18) Thus, the probability of exceeding the threshold is only 88%...
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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 ... 300 350 400 FIGURE 4 .6: System throughput for FHMA system with perfect side information (N = 128, perfect codes) P1: IML/FFX MOBK023-04 P2: IML MOBK023-Buehrer.cls 124 September 28, 20 06 15:55 ... separate load levels, which we will call Limit A and Limit B Limit A is typically 60 % of pole capacity for the uplink (or 60 % of the transmit power for the downlink) and is the limit at which a base...
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Code Division Multiple Access (CDMA) phần 8 potx

Code Division Multiple Access (CDMA) phần 8 potx

Hóa học - Dầu khí

... (5. 56) P1: IML/FFX MOBK023-05 P2: IML MOBK023-Buehrer.cls September 28, 20 06 15: 56 MULTIUSER DETECTION 145 70 Perfect cancellation assumption Linear cancellation 60 Normalized receive power 50 40 ... frequency selective Rician fading channels [64 , 65 ] as well as flat and frequency selective Rayleigh fading channels (both coherent and differentially coherent) [66 –71] The most notable difference between ... 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 previous...
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Code Division Multiple Access (CDMA) phần 9 docx

Code Division Multiple Access (CDMA) phần 9 docx

Hóa học - Dầu khí

... 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 ... September 28, 20 06 15: 56 MULTIUSER DETECTION Probability of Bit Error 10 10 153 Matched Filter Stage Conv Decorrelator Stage Dec 10 SingleUser Bound 0.1 0.2 0.3 0.4 ρ 0.5 0 .6 0.7 0.8 0.9 FIGURE ... 20 06 15: 56 CODE DIVISION MULTIPLE ACCESS (CDMA) Mathematically, we can represent the bit decisions for an S-stage parallel cancellation scheme at any stage s as (s ˆ (s b k ) = sgn zk ) (5 .69 )...
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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 ... relative to maximum available -2 -4 0-stage 1-stage 2-stage 3-stage -6 -8 -10 10 20 30 Number of active users 40 50 60 40 50 60 Average frame erasure rate 10 FER 0-stage 1-stage 2-stage 3-stage ... IEEE, vol 68 , pp 593 61 9, May 1980 [24] R Gold, “Optimum binary sequences for spread spectrum multiplexing,” IEEE Transactions on Information Theory, vol 13, pp 61 9 62 1, October 1 967 doi:10.1109/TIT.1 967 .10 5404 8...
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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) tình trạng triển khai

Cao đẳng - Đại học

... 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 HSDPA 75 nước, kết thúc năm 2007, số nhà mạng sử ... lý mô tả hình 2 .6 Thử thách chứng minh ảnh hưởng việc gia tăng khuếch đại cho phép mà tạo thành tài khoản bên thu thực cải tiến chạy Re 6 hay khả khác để cải tiến dung lượng đưa vào bên phát ví ... lập gọi thông thường Công việc tập trung vào việc làm để cải thiện thiết lập gọi thoại Re’99 bắt đầu phương pháp đưa vào thiết bị tồn Bây phải tập trung vào điều chỉnh lớn mà không làm việc với...
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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 ... The pseudorandom sequence to be sent on the subcarriers is specified in is fixed the IEEE 802.16e standard - The Zadoff-Chu sequence loaded onto the subcarriers is specified in the - A mobile ... carriers to obtain wider Forming fixed size physical resource units (PRUs) Nhóm Base on the IEEE 802.16m standard WiMAXv2 and LTE-A CONCLUSION Nhóm This article has compared the use of OFDMA in WiMAX...
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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

... triển WiMax WiMAXv2 dựa tiêu chuẩn IEEE 802.16m, có khả tương thích ngược với hệ thống WiMAX 802.16e tiêu chí quan trọng Với đặc điểm OFDMA, 802.16m không sử dụng ký hiệu kênh khái niệm PUSC ... vị tối thiểu phân bổ cho khung điều có nghĩa tối thiểu 168 sóng mang phân bổ trường hợp LTE Tốc độ lớp PHY tối thiểu hỗ trợ đường xuống 16, 8 kb/s giả sử nguồn tài nguyên phân bố khung Để truyền ... nhấn mạnh vào việc sử dụng kỹ thuật HARQ để xử lí điều kiện kênh wireless [1, 2] Sử dụng phân tập đa người dùng Trong kịch điển hình, người dùng sử dụng tần số chọn lọc khác tùy thuộc vào vị trí...
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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 ... of MMSE ICI suppression 35 Fig.3 .6: Flowchart of MMSE-SD detection 36 Fig.3.7: Average symbol error rates versus SNR with perfect CIR 40 Fig.3.8: Average symbol error rates...
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