Fair service provision in OFDMA with partial channel-state information

Abstract

We address the problem of resource allocation on an OFDMA downlink under fairness constraints with limited Channel State Information (CSI). Target QoS corresponds to a minimum user data rate, a target bit-error rate and a maximum outage probability. The only available CSI is the channel average gain of each user. This partial CSI can be viewed as a shadowed pathloss that yields a modified user distribution on which resource allocation is based. Under these constraints, we provide the optimal resource allocation that maximizes the user rate. Compared to full-CSI-based allocation schemes, our solution offers a significant complexity and feedback reduction as well as a good robustness to CSI estimation errors.

Suboptimal resource allocation scheme for scalable video multicast in integrated mobile WiMAX/WLANs network

“…Table I and Table II lists video workload parameters and OFDMA parameters for mobile WiMAX and WLAN considered for proposed network model. (1) [15], [16], [17], [20], [25], [26], [27], [35], [36], [37] where Ck,n is sub-carrier allocation indicator, Pk,n is PA indicator and Hk,n is effective sub-channel signal to noise ratio (SNR), ω is weight of the user for estimation of priority. …”

“…Hence 2 subcarriers allotted to each user. We applied both Linear [15], [16], [17], [18], [19], [20] and Active-set algorithm. It is found that channel capacity achieved using Active-Set optimization is more as compared to Linear Approach.…”

“…Researchers have presented numerous RAS proposed in [10], [12], [13], [15], [16], [17], [19], [20], [24], [26] for data unicast in IEEE 802.16e networks. These algorithms allocate resource with different performance objective like low complexity [15], [17], [26] through put maximization [15], [26], [27] and number of satisfied users [27].…”

“…In proposed algorithm an Active Set method. This approach reduces the computational complexity as it is achieved using approaches used in [15], [16], [17], [20], [28], [29], [30], [31]. This paper proposed following main contributions: 1.…”

“…Section 4 describes proposed GWA scheme for sub-carrier allocation. Section V provides in detail analytical model of proposed Active-Set optimization for basic OFDMA system model used in [15], [16], [17], [18], [19], [20], [26] and apply to proposed; integrated WiMAX/ WLAN network described in Section 3. Section 4 shows simulated results for channel capacity, satisfied number of users and throughput of the network.…”