6 31 anten và búp sóng

Bài giảng môn hệ THỐNG VIỄN THÔNG

Ngày tải lên : 06/12/2015, 14:07

... 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 ... (p), mp =1 ,67 2 10-27 kg, tớch in dng + 1 ,60 2 10-19 C Ntron(n), mn = 1 ,67 5 10-27 kg, khụng mang in Ht nhõn ca cỏc nguyờn t u bn (tr cỏc nguyờn t phúng x) Electron(e) ,me = 9,1 10 -31 kg , tớch...

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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

... a fading environment when using multiple antennas,” Wireless Personal Communications, vol 6, no 3, pp 311 –335, 1998 [2] I E Telatar, “Capacity of multi-antenna Gaussian channels,” European Transactions ... 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...

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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 ... 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 48 60 The cross-correlation between a preferred pair of m-sequences can be shown...

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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

... = 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 ... (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...

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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 ... 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

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 ... termed system load, which for CDMA systems can be deﬁned as ηUL = − σn Itotal (3 .64 ) where Itotal = Iic + Io c + σn (3 .65 ) σn is the receiver thermal noise power, Iic is the in-cell interference, ... 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

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

... spreading gain = 31) P1: IML/FFX MOBK023-05 P2: IML MOBK023-Buehrer.cls 160 September 28, 20 06 15: 56 CODE DIVISION MULTIPLE ACCESS (CDMA) desired user to 30dB above the desired user for N = 31 and Eb ... 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

... MOBK023-Buehrer.cls 166 September 28, 20 06 15: 56 CODE DIVISION MULTIPLE ACCESS (CDMA) where Zk,l,i,n is the vector of Walsh transform outputs for the lth path of the kth user received on the ith antenna during ... the ith antenna after 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 ... 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...

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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 ... có hai nhiều anten 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 mô tả hình 2 .6 Thử thách ... 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

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 ... bandwidths, the ability to handle different data rates, and the ability to easily combine with multiple antenna techniques Nhóm - The focus of this article is on the comparative use of OFDMA in LTE and ... 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...

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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

... pháp BAMC sử dụng nhóm sóng mang liền kề trải số ký tự OFDM để đạt MUD Có sóng mang liền kề xếp nhóm, gọi bin, hình Mỗi bin có sóng mang liệu sóng điều khiển, bin liền kề nhóm vào band Người dùng ... hoạt động, trình tự gửi trung tâm có 64 sóng mang chiếm 0. 96 MHz băng thông.Do đó,không giống phần đầu WiMAX,số lượng sóng mang sử dụng PSS cố định Hơn nữa, sóng mang liên tiếp phần băng thông ... khoảng 16% Khi nhiều antenna sử dụng, phần mào đầu khác phụ thuộc vào loại mode truyền dẫn Ví dụ, không gian thời gian mã hóa sử dụng, số liệu hữu dụng gửi qua antenna giống trường hợp antenna...

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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

... 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 ... Diversity 61 3.2.3 Combining Cyclic Delay Diversity and Antenna Spreading Diversity 63 iii 3.3 Theoretical Performance Analysis 66 3.4 Simulation ... 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...

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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 ... zero forcing ICI suppression 31 Fig 3.5: Noise enhancement characteristic of MMSE ICI suppression 35 Fig.3 .6: Flowchart of MMSE-SD detection 36 Fig.3.7: Average symbol error...

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