Báo cáo hóa học: "Research Article Linearly Time-Varying Channel Estimation and Symbol Detection for OFDMA Uplink Using " potx

... Communications and Networking Volume 2009, Article ID 307375, 11 pages doi:10.1155/2009/307375 Research Article Linearly Time-Varying Channel Estimation and Symbol Detection for OFDMA Uplink Using Superimposed ... (STs-) based linearly time-varying (LTV) channel estimation and symbol detection for orthogonal frequency-division multiplexing access (O...

Ngày tải lên: 21/06/2014, 23:20

... the symbol duration and reducing the ISI. Channel estimation has been successfully used to improve the performance of OFDM systems. It is crucial for diversity combination, coherent detection, and ... Wireless Communications and Networking Volume 2009, Article ID 647130, 8 pages doi:10.1155/2009/647130 Research Article DFT-Based Channel Estimation with Symmetric Extensi...

Ngày tải lên: 21/06/2014, 22:20

... groups: Amplify -and- Forward (AF) [3, 4, 8, 10–13], Compress -and- Forward (CF) [5, 20], and Decode -and- For- ward (DF) [1–3, 6, 7, 9, 15]. In the AF schemes, relays amplify (and maybe transform [4]) the ... IEEE Standard for local and metropolitan area networks—part 16: air interface for fixed and mobile broadband wireless access systems. Amendment 2: physical and medium acc...

Ngày tải lên: 21/06/2014, 11:20

... (i.e., thousands of devices) and perform efficient data access and queries, for example, for accessing device properties, for querying for devices that match certain requirements, or for estimating ... from Layers 1and2 only. Whenever new hardware is available or the existing standard profiles, standard variable types, functions, and so forth need to be expanded, it should be the...

Ngày tải lên: 21/06/2014, 11:20

... mixing from baseband to passband and with negative sign when mixing from passband to baseband (e.g., [23]). Consequently, the equivalent complex baseband-to-baseband channels from A toBandfromBtoAare  h AB = ... (31). 6.3. Channel Estimation Error: Equivalent Two-Hop Channels. A sensible performance measure for the channel estimation schemes was found to be how well the anticipat...

Ngày tải lên: 21/06/2014, 17:20

... Image and Video Processing Optical flow between frames 9 and 10 (a) MEI for tennis hit (b) Color segmentation for background area (c) Color segmentation for activity area (d) Segmentation result for ... are noisy, and the illumination is varying. 7. SUMMARY AND CONCLUSIONS In this paper, we have presented a novel hybrid approach for analyzing and processing the motion and...

Ngày tải lên: 22/06/2014, 06:20

... context-based coding) and channel coding (e.g., turbo codes and low-density parity-check codes). Joint source and channel coding have also been considered; while different source and channel codes can ... previous case. For R C = 8/9, only 0.5276 bps are trans- mitted on the channel, as compared to the rate of 1 bps for the original data. For R C = 4/5, the bit-rate is 0.5...

Ngày tải lên: 22/06/2014, 19:20

... al. 7 For i = 1toN generate a noise random matrix with mean 0 and variance σ w = (σ 2 q x + σ 2 q y )α where 0  α  3 No Yes i = N Generate M sets of values for the two random matrices Q x and ... Section 6.1 by using the algorithm presented in Figure 5 to calculate the mean variance and the covariance of random variables q x and q y .Asanillustrativeexample, we chose x = 1andy...

Ngày tải lên: 22/06/2014, 19:20

... ϕn  s i i (n) s i q (n)  +  w i (n) w q (n)  , (34) where y i i and y i q are the inphase and quadrature components of received information signal, and s i i and s i q the inphase and quadrature components of the transmitted information sig- nal. ... 802.11a standard, the preamble contains P = 10 short symbols, each consisting of M = 16 data samples. Each OFDM symbol contains...

Ngày tải lên: 22/06/2014, 20:20

... examples for two ASLT methods, for T 60 ≈ 0.1 s and SNR ≈ 15 dB. (a) Example of microphone signal. (b) and (c) Estimation error and standard deviation for PF-VAD and SBF-PL (results averaged over ... low-variance spectrum estimation and an adaptive threshold,” IEEE Transactions on Audio, Speech and Language Processing, vol. 14, no. 2, pp. 412–424, 2006. [13] B. Anderson...

Ngày tải lên: 22/06/2014, 23:20