6 32 mcpc multiple channel

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 ... 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: " 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 ... on Information Theory, vol 44, no 4, pp 1 468 – 14 76, 1998 [12] W Yu, W Rhee, and J Cioﬃ, “Optimal power control in multiple access fading channels with multiple antennas,” in Proc IEEE International ... maximize the sum capacity of a time invariant Gaussian MIMO multiple- access channel The ergodic capacity region for MIMO multiple- access channel with covariance feedback has been studied in [13]...

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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

... replica of the received data based on channel estimates Joint channel estimation is used to estimate multiple channels (in our case U channels) jointly For JLSCE, the channels have to be assumed invariant ... 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 spread-spectrum multiple- access channels,” IEEE Journal on ... the channel coeﬃcients are assumed to stay constant over the whole transmission block In this case, the channel model (2) can be rewritten with a channel vector of length U · (L + 1) as the channel...

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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, ... 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 ... http://www.simpopdf.com CONTENTS 2 .6 2.7 2.8 2.9 vii Multiple Access Performance of Direct Sequence Code Division Multiple Access . 56 2 .6. 1 Gaussian Approximation...

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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 ... noise channels and fading channels) as well as the multiple access performance are examined Special emphasis is given to fading channels since spread spectrum is more advantageous in these channels...

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Code Division Multiple Access (CDMA) phần 2 doc

Ngày tải lên : 07/08/2014, 21:20

... 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) ... = 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 ... (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

... 15:54 CODE DIVISION MULTIPLE ACCESS (CDMA) R7,8 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 ... 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 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 ... this ignores the requirement for additional channel estimation, which can be substantial 2 .6 MULTIPLE ACCESS PERFORMANCE OF DIRECT SEQUENCE CODE DIVISION MULTIPLE ACCESS The previous section examined...

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Code Division Multiple Access (CDMA) phần 5 ppt

Ngày tải lên : 07/08/2014, 21:20

... a single channel by multiple information streams For example, ten 3-kbps information streams can be time-multiplexed onto a single 30-kbps channel In time-multiplexing, the overall channel capacity ... 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 ... September 28, 20 06 15:55 CODE DIVISION MULTIPLE ACCESS (CDMA) 3.1.4 Statistical Multiplexing The ﬁnal fundamental CDMA concept that we will discuss in this section is termed statistical multiplexing,...

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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 ... spectrum brings with it the possibility of multiple channels since multiple spreading codes are possible With multiple channels, we now must determine which channels (i.e., codes) the receiver should ... section and brieﬂy discuss channel access techniques in Section 4.2 P1: IML/FFX MOBK023-04 P2: IML MOBK023-Buehrer.cls 112 September 28, 20 06 15:55 CODE DIVISION MULTIPLE ACCESS (CDMA) 4.1 CODE...

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Code Division Multiple Access (CDMA) phần 8 potx

Ngày tải lên : 07/08/2014, 21:20

... 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 ... MOBK023-05 P2: IML MOBK023-Buehrer.cls 1 36 September 28, 20 06 15: 56 CODE DIVISION MULTIPLE ACCESS (CDMA) The decorrelator can also be extended to non-AWGN channels For example, the receiver can ... MOBK023-Buehrer.cls 130 September 28, 20 06 15: 56 CODE DIVISION MULTIPLE ACCESS (CDMA) addressed by Schneider [ 56] for both the synchronous and asynchronous AWGN channels Verd´ expanded this work by...

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Code Division Multiple Access (CDMA) phần 9 docx

Ngày tải lên : 07/08/2014, 21:20

... degradation in near-far channels (AWGN, Eb /No = 5dB for desired user and spreading gain = 31) P1: IML/FFX MOBK023-05 P2: IML MOBK023-Buehrer.cls 160 September 28, 20 06 15: 56 CODE DIVISION MULTIPLE ACCESS ... 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 ) ... (−1)s Ps s =0 n (5.88) P1: IML/FFX MOBK023-05 P2: IML 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...

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Code Division Multiple Access (CDMA) phần 10 pot

Ngày tải lên : 07/08/2014, 21:20

... CDMA channels,” 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,” ... September 28, 20 06 15: 56 MULTIUSER DETECTION 5 .6. 2 167 Performance in an Additive White Gaussian Noise Channel Our initial investigation of PIC for IS-95 focuses on the simplest case: an AWGN channel ... 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 ... triển, gồm có HS-SCCH (High Speed Shared Control Channel – kênh điều khiển dùng chung tốc độ cao), HS-DPCCH (High Speed Dedicated Physical Control Channel – kênh điều khiển vật lý dành riêng tốc ... bị công nghệ phân bố nhiều vùng khác giới, Tây Âu (61 mạng), tiếp Nam Á (35), Đông Âu (34), Trung Đông châu Phi (20), châu Mỹ vùng Caribbe ( 16) .HSDPA nhiều vùng có tốc độ download lên tới 7,2...

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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

... - In LTE, BTS uses the channel feedback from the mobile to schedule an RB for the user in a frame - The feedback can be periodic - Different modes of channel feedback - Channel feedback can be ... AND LTE PERFORMANCE BOUNDS FOR SYNCHRONIZATION AND CHANNEL ESTIMATION EVOLUTION OF WIMAX AND LTE Nhóm CONCLUSION INTRODUCTION - IEEE 802.16e-based WiMAX and Third Generation Partnership Project ... subcarriers used in a reference subchannel in a reference cell are - In LTE, there can be a clash in the positions of the data subcarriers that distributed in different subchannels in the reuse cells...

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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

... 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 ... 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 thông.Do đó,không giống phần đầu WiMAX,số lượng sóng mang sử dụng PSS cố định ... 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...

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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 Multiplexing ... 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 ... P = Uniform PDP, P = 16 Exponential Decay PDP, P = 16 Uniform PDP, P = 32 Exponential Decay PDP, P = 32 −1 10 −2 BER 10 −3 10 −4 10 −5 10 Eb/N0 (dB) 10 11 12 13 14 15 16 Figure 2.4: Theoretical...

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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

... LS Estimators 63 4.5 Numerical Results and Discussion 66 4.5.1 Performance of Estimation 67 4.5.2 Performance of ICI Suppression with Channel Estimation 71 ... 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 ... Typical OFDM-based multiple access techniques include Time Division Multiple Access (OFDM-TDMA), Code Division Multiple Access (OFDM-CDMA or MC-CDMA) and Frequency Division Multiple Access (OFDM-FDMA)...

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