Báo cáo hóa học: "Research Article Uplink User Signal Separation for OFDMA-Based Cognitive Radios" pot

... (dB) 5users,AWGN 5users,MP 10 users, AWGN 10 users, MP 20 users, AWGN 20 users, MP Figure 8: Performances in separating the user subcarriers in AWGN and MP channels for various numbers of users. subcarriers. ... 120 symbols. 6.2. User Separation Simulations. Performance of the pro- posed user separation algorithm was tested via simulations using the following performance metrics....

Ngày tải lên: 21/06/2014, 19:20

... order. In [35], user selection criteria are considered for mul- tiuser MIMO systems, where a single user is selected to transmit signals to a base station (BS) at a time. By viewing multiuser MIMO ... 16-QAM are used for signaling with Gray mapping. With 4-QAM modulation, in Figures 1 and 2, for channel matrices of size 2 × 4and3× 4, respectively, we show simulation results of BER...

Ngày tải lên: 21/06/2014, 11:20

... method for separating mutually independent source signals from mixed signals. In [9], ICA was used for speech feature extraction and phoneme recognition resulting in good recognition performance, ... used for testing each speaker. Tab le 1 shows the reverberant conditions. Speech signals were digitized into 16 bits at a sampling frequency of 12 kHz. For spectral analysis, an ST-DFT wa...

Ngày tải lên: 21/06/2014, 20:20

... first signal is I signal and the second signal is Q signal before DBF. These signals share the same shape since both signals are from the same types of demodulator Table 4: Measured I and Q signals ... and reference signal. The beamforming algorithm is implemented on C67 floating point DSP for the low-cost noncoherent testbed system. It does not waste the bandwidth for the training...

Ngày tải lên: 21/06/2014, 22:20

... characteristics for a given scenario and multiple-drop simulation is needed even for link-level performance evaluation. 3. Evaluation Metrics for Wideband MIMO Channels To evaluate the impact of various potential ... when the number of RVs in the model is reduced. For the baseline model, there are 6 (for LOS) or 5 (for NLOS) RVs, that is, 5 (for LOS) or 4 (for NLOS) random LSPs an...

Ngày tải lên: 21/06/2014, 23:20

... values estimated for the required minimum operating frequencies. Two main clusters of points can be identified in the plot of Figure 7: the one for the QCIF and the one for the CIF for- mat. The former format ... (30 fps) for the QCIF and CIF image formats by using any fast or adaptive search algo- rithms, except the 4SS for CIF images (see Ta ble 3). More- over, the minimum throug...

Ngày tải lên: 22/06/2014, 19:20

... and DOA information. 2.2. The received signal model for polarization sensitive array Assume that a signal b(t) arrives at the uniform linear array with M pairs of crossed dipoles. The received signal ... performance of the proposed blind PARAFAC signal detection algorithm. The number of Monte Carlo trials is 1000. The PARAFAC algorithm does not re- quire DOA information and polariza...

Ngày tải lên: 22/06/2014, 19:20

... private from nonauthorized users; only a legal user may receive them. This is due to the fact that legal users must pay for the contents of the data, and nonauthorized users may want to steal it. ... source for MBMS data, or scheduling and receiving MBMS data from third parties. It offers an interface for content providers to deliver the requested data to allocated users. SGSN performs...

Ngày tải lên: 23/06/2014, 00:20

... 7.InFigure 7, we plotted the signal power for user 1 and user 2 after the correlation operation in (15) for sequence length of 36 and 64. In the absence of the CFO, user 1’s signal should be contained ... some signal components are leaked into the other samples and b ecome interference to user 2. For the case of L = 18 and N = 36, all the leaked signals from user 1 becom...

Ngày tải lên: 21/06/2014, 05:20

... J. Isoaho, “Objectives for new error criteria for mobile broadcasting of streaming audiovisual services,” EURASIP Journal on Advances in Signal Processing, vol. 2008, Article ID 518219, 21 pages, 2008. [77] ... trohmeier, “Designing for user experience: what to expect from mobile 3D TV and video?” in Proceedings of the 1st International Conference on Designing Interactive User E...

Ngày tải lên: 21/06/2014, 05:20