Abstract
Resource (power and bandwidth) allocation is an important issue in orthogonal frequency division multiple access (OFDMA) systems. For multicell systems, the interference across different cells makes the optimization of resource allocation difficult. For finite systems, a constraint on the rise over thermal (ROT) is placed to alleviate the intercell interference. A hybrid scheme with equal receive power and peak transmit power is shown to be optimal for the ROT constrained case. Large system analysis is applied for multi-cell OFDMA systems with the fairness constraint of equal grade of service (EGOS). An interference function is defined to model the intercell interference. Variational analysis is used to compute the optimal profile of transmit power and bandwidth. The optimal resource allocation is then computed using numerical simulations.
Highlights
Orthogonal frequency division multiple access (OFDMA) has become the fundamental signaling technique for uplink 4G wireless communication systems (e.g., Worldwide Interoperability for Microwave Access (WiMAX); single-carrier frequency division multiple access (SC-FDMA) is used in uplink Long-Term Evolution (LTE) systems, the structure is still similar to OFDMA)
We illustrate the analytical results in this paper via simulations
We simulated the performance of two alternative resource allocation schemes, namely all peak power and equal receive power schemes
Summary
Orthogonal frequency division multiple access (OFDMA) has become the fundamental signaling technique for uplink 4G wireless communication systems (e.g., Worldwide Interoperability for Microwave Access (WiMAX); single-carrier frequency division multiple access (SC-FDMA) is used in uplink Long-Term Evolution (LTE) systems, the structure is still similar to OFDMA). The resource allocation scheme obtained from the single-cell case may not apply for practical systems. In this paper, we study the situation where there is no explicit cooperation across different cells while each user’s resource (power and bandwidth) is stationarily allocated with the awareness of inter-cell interference. It can be applied in practical OFDMA systems as an openloop control strategy and provides reasonably good initial values for inter-cell coordination-based dynamic algorithms. The problem of resource allocation is converted into a constrained optimization Such an approach is applicable in finite systems.
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