6 37 nhiệt tạp âm tương đương của máy thu

Bài giảng môn hệ THỐNG VIỄN THÔNG

Ngày tải lên : 06/12/2015, 14:07

... 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 0,381 0, 265 0,175 0,107 0, 061 0,032 0,017 0,008 0,004 0,002 0,001 Chng ... 460 470 480 490 500 510 520 530 540 550 560 trng tng i 0,001 0,004 0.012 0,023 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 ... nhiu B phn chớnh ca mt l mt thu kớnh hi t, sut, mm, gi 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,...

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

Ngày tải lên : 23/06/2014, 01:20

... 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 ... in ( 16) can be derived in closed form Each value C(h1 ) and C(h2 ) is the capacity of an AWGN channel with a single antenna element at the transmitter and m antenna elements at the receiver Thus ... uniformly distributed over (0, 2π] Thus, their joint probability density function is given by the product of the individual probability density functions [ 16] : pdf a1 , a2 , cos 2θ = g a1 g a2...

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Code Division Multiple Access (CDMA) phần 6 docx

Ngày tải lên : 07/08/2014, 21:20

... 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: " Iterative Pilot-Layer Aided Channel Estimation with Emphasis on Interleave-Division Multiple Access Systems Hendrik Schoeneich and Peter Adam Hoeher" docx

Ngày tải lên : 22/06/2014, 23:20

... 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

Ngày tải lên : 27/06/2014, 14:20

... 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 ... can be shown that D = 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...

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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

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Code Division Multiple Access (CDMA) phần 1 doc

Ngày tải lên : 07/08/2014, 21:20

... 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

Ngày tải lên : 07/08/2014, 21:20

... can be shown that D = 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 ... (CDMA) The smallest valid value of Q greater than 6. 48 is then Q = (i = 2, j = 1) Thus, the maximum number of allowable channels per cell is 450 = 64 K= (1.18) Now, if we include the second tier ... 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...

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Code Division Multiple Access (CDMA) phần 3 potx

Ngày tải lên : 07/08/2014, 21:20

... 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

Ngày tải lên : 07/08/2014, 21:20

... 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 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 ... 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...

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Code Division Multiple Access (CDMA) phần 5 ppt

Ngày tải lên : 07/08/2014, 21:20

... 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 ... 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% Examining ... 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...

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Code Division Multiple Access (CDMA) phần 7 pps

Ngày tải lên : 07/08/2014, 21:20

... 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 ... ηUL (1 − ηUL )2 Itotal = (3 .68 ) − ηUL Thus, one way to estimate the interference increase due to a particular load increase is to use the approximation Itotal L (3 .69 ) I= − ηUL where the increase ... MOBK023-Buehrer.cls 120 September 28, 20 06 15:55 CODE DIVISION MULTIPLE ACCESS (CDMA) Solution: The two signals are transmitted at the same time, and thus the second signal arrives 60 0m/(3 ∗ 108 m/s) = μs This...

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Code Division Multiple Access (CDMA) phần 8 potx

Ngày tải lên : 07/08/2014, 21:20

... 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 ... 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 ... PK + N N N N (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...

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Code Division Multiple Access (CDMA) phần 9 docx

Ngày tải lên : 07/08/2014, 21:20

... MOBK023-Buehrer.cls 1 56 September 28, 20 06 15: 56 CODE DIVISION MULTIPLE ACCESS (CDMA) If we let M → ∞, M (−1)s Ps lim M→∞ = R−1 (5.89) s =0 provided that P p < where P p is the p-norm of matrix P Thus, as ... 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 ... 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

Ngày tải lên : 07/08/2014, 21:20

... s stages cancellation will thus be represented by r ik,l,s P1: IML/FFX MOBK023-05 P2: IML MOBK023-Buehrer.cls September 28, 20 06 15: 56 MULTIUSER DETECTION 5 .6. 2 167 Performance in an Additive ... 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 ... 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 .1054048...

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

Ngày tải lên : 02/06/2015, 17:26

... 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 ... động băng thông rộng Ngoài ra, số lượng trạm thu phát HSDPA mặt đất tăng nhanh để đáp ứng nhu cầu thu phát liệu Được giới thiệu có “tốc độ lên tới 3 .6 Mbit/giây”, song số đạt điều kiện lý tưởng ... liệu theo phương thức Đây coi sản phẩm dòng 3.5G Công nghệ cho phép liệu download máy điện thoại có tốc độ tương đương với tốc độ đường truyền ADSL, vượt qua cản trở cố hữu tốc độ kết nối điện...

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

Ngày tải lên : 24/07/2015, 22:26

... 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

Ngày tải lên : 24/07/2015, 22:27

... 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 phương pháp hình thành kênh tương tự ... đồng khung thu cách phát đồng trình tự (PSS),được gửi hai lần khung thời gian cố định mức 10 ms,không phân biệt băng thông hoạt động, trình tự gửi trung tâm có 64 sóng mang chiếm 0. 96 MHz băng ... antenna giống trường hợp antenna Số pilots thu nhỏ tương ứng để giữ lại giống phần mào đầu Nếu ghép kênh không gian sử dụng, pilots sử dụng hình dạng tương tự, số ký tự data tăng lên, dẫn tới...

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

Ngày tải lên : 08/09/2015, 18:24

... 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 ... Paths 48 2 .6. 5 Multiple Receive Antennas System 50 2 .6. 6 Spatial Multiplexing System with Multiple Transmit and Receive Antennas 51 2 .6. 7 Maximizing Diversity ... 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

Ngày tải lên : 14/09/2015, 14:03

... 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 ... 2.2.2 Supplementary Schemes based on Conventional Detection 16 2.2.3 Non Conventional Detector-based Schemes 16 2.3 Problem Definition 17 2.3.1 Near-far Problem in...

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