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6 29 cửa sổ tần số

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 ... khỏc Cú t 6- 7 triu Tp trung ch yu ti im vng ti trung tõm vừng mc Cm nhn trờn di hp phõn gii thp Cú loi t bo nún cm nhn cỏc tn s cm nhn mu sc 460 nm ( xanh lam ), 575 nm ( xanh lc), 62 5 nm (...
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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

... 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 1298 ... 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

... Then ( 26) and (27) can be combined to obtain Ryy − Γ = X · Rhh · XH + X · Rhh · PH + P · Rhh · XH + P · Rhh · PH = X + P · Rhh · X + P H (29) Combining the intermediate results from (24) to (29) , ... 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...
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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 ... (CDMA) R Michael Buehrer www.morganclaypool.com ISBN: 159 8290 401 ISBN: 978159 8290 400 paperback paperback ISBN: 159 8290 41X ebook ISBN: 978159 8290 417 ebook DOI 10.2200/S00017ED1V01Y200508COM002 A Publication...
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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 ... (CDMA) R Michael Buehrer www.morganclaypool.com ISBN: 159 8290 401 ISBN: 978159 8290 400 paperback paperback ISBN: 159 8290 41X ebook ISBN: 978159 8290 417 ebook DOI 10.2200/S00017ED1V01Y200508COM002 A Publication...
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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 ... (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

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 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

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 ... 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 ... 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

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 previous ... dispreading Decisions are then made as b = sgn y (5 .6) P1: IML/FFX MOBK023-05 P2: IML MOBK023-Buehrer.cls September 28, 20 06 15: 56 MULTIUSER DETECTION 129 where the function sgn(x) is applied element-by-element ... 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...
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Code Division Multiple Access (CDMA) phần 9 docx

Code Division Multiple Access (CDMA) phần 9 docx

Hóa học - Dầu khí

... 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 ) ... 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

Code Division Multiple Access (CDMA) phần 10 pot

Hóa học - Dầu khí

... Letters, vol 2, no 2, pp 36 38, 1998.doi:10.1109/4234 .66 07 96 P1: IML/FFX P2: IML/FFX MOBK023-BIB QC: IML/FFX MOBK023-Buehrer.cls T1: IML September 28, 20 06 17:14 BIBLIOGRAPHY 175 [29] D Hibbard, “On ... 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 on Communications, vol 42, pp 1 729 1739, February/March/April ... 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...
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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

... 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 dụng công nghệ 204, 89 quốc ... tốc độ mạng không Có tới 62 % số mạng có tốc độ download cao 3 ,6 MB/giây, có 21% số mạng đạt 7,2 MB/giây GSA cho rằng, phát triển mạng 3,5G ảnh hưởng đến dịch vụ băng tần toàn cầu, nhiều nhà mạng ... “tốc độ lên tới 3 .6 Mbit/giây”, song số đạt điều kiện lý tưởng Do vậy, tốc độ đường truyền không nhanh mong đợi, đặc biệt điều kiện phòng kín Tình hình triển khai HSDPA Theo số liệu Nghiệp đoàn...
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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

... bố từ trái sang phải khung truyền, thể hình 1a, số lượng sóng mang sử dụng ký tự OFDM giảm Sử dụng phân tập tần số Cả WiMAX LTE gặp fading tần số có chọn lọc sử dụng băng thông rộng [1, 2] Điều ... thách thức số pilots bị hạn chế số lượng tiles bị chiếm người dùng Bởi chuỗi preamble PN điều chế sóng mang thứ 3, tần số lớn bù đắp ước lượng cách tương quan phần chu kì preamble 16. 4 KHz Hiệu ... 802.11n Một số nhược điểm tỷ số công suất đỉnh công suất trung bình(PAPR) có lý không sử dụng OFDMA cho đường lên LTE Tuy nhiên, WiMAX, sử dụng thông minh tài nguyên thời gian -tần số giảm bớt...
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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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