Báo cáo hóa học: " Research Article Practical Approaches to Adaptive Resource Allocation in OFDM Systems" docx

... user or- dering, algorithm “e”, lies in the middle between “W” and “B”. 5. CONCLUSIONS In this paper, we consider practical approaches to the prob- lem of optimal resource allocation in OFDM- based ... potential for increasing the multiuser diversity in multiple access has resulted in an extension of the algorithm to OFDMA [24]. A low-complexity implementa- tion of the...

Ngày tải lên: 22/06/2014, 19:20

... improved by increasing β. 4. PROPOSED RESOURCE ALLOCATION FOR MULTIUSER OFDM SYSTEMS In this Section, we propose a novel resource allocation rule to increase β in multiuser OFDM systems such as OFDMA system ... subcarriers (i.e., the OFDM symbol duration in the sample time domain) and j = √ −1. To mitigate the intersymbol interference (ISI) and inter- carrier interfere...

Ngày tải lên: 22/06/2014, 19:20

... interesting and quite reasonable. In this paper, we consider the problem of finding zeros of maximal monotone operators by hybrid proximal point method. To be more precise, we introduce two kinds of ... references therein. In this paper, motivated by the research work going on in this direction, we continue to consider the problem of finding a zero of the maximal monotone operator T...

Ngày tải lên: 21/06/2014, 11:20

... exchange protocol enhance the security level during network initialization. The modified DH key exchange protocol is fit into mobile WiMAX network to eliminate existing weakness in original DH key ... function using HMAC/CMAC. Thus, there remain two insecure domains: insecure domain B between BS and ASN/GW and insecure domain C between ASN and CSN. The reason we called the areas insecure do...

Ngày tải lên: 21/06/2014, 17:20

... QAM Channel coding/decoding Turbo coding (R = 1/2, k = 4)/ (FEC) Max-Log-MAP decoding (Iterations =8) Channel interleaving Random interleaving Interpolation in time direction First order linear interpolation Oversampling ... noise, by introducing a degenerated inverse matrix and oversampling technique. The zero-insertion CTF for M-fold oversampling is first formed by inserting MN-N c zeros...

Ngày tải lên: 21/06/2014, 20:20

... a C M−1 diffeomorphism of R N mapping Ω ε into Ω, ∂Ω ε into ∂Ω,andΩ ε into and onto Ω. It is straightforward to check that such a diffeomorphism also maps ∂Ω ε onto ∂Ωapproximate x ∈ ∂Ω by a sequence ... maps Ω ε into Ω, ∂Ω ε into ∂Ω,andΩ ε into Ω. That it actually maps Ω ε onto Ω follows from a Brouwer’s degree argument: Ω is connected and no point of Ω is in ϕε, ∂Ω ε  since, as just no...

Ngày tải lên: 21/06/2014, 20:20

... subcarriers in one OFDM symbol. There are several interpolation methods including linear interpolation method, second-order polynomial interpolation method, and phase-compensated interpolation [4]. In ... to obtain the refined channel estimation in time domain. The MST algorithm deals with each OFDM symbol by reserving the most significant L  paths in terms of power and setting t...

Ngày tải lên: 21/06/2014, 22:20

... S 3 . Another interesting point to observe is the final occu- pancy level of the load factor. In case of an optimal allocation, the sum of the individual load factors, allocated to the services ... important counties in Spain, which corresponds to the capitals of the 50 Spanish provinces. We are considering the main cities and the surrounding towns under their administrative in ue...

Ngày tải lên: 21/06/2014, 23:20

... By main- taining PCFC, PER in j (l) remains unchanged. Therefore, by increasing L j , the outage probability in the above equation can be reduced. 4. AC PROBLEM FORMULATION BY INCLUDING ARQ In ... Toronto, Canada, September 1995. [22] A. Wyglinski, “Performance of CDMA systems using digital beamforming with mutual coupling and scattering effects,” M.S. thesis, Queen’s University, Kingsto...

Ngày tải lên: 22/06/2014, 19:20

... power interfering due to shadowing effects In this section, we investigate the impact of nonequal in- terfering powers caused by shadowing on the optimal an- tenna spacings. This amounts to include ... will bring in- sight into the structure of the optimal array, which can be to some extent generalized to a mobile scenario. In fact, in mo- bile systems or in case the posit...

Ngày tải lên: 22/06/2014, 19:20