Escudero Garzas, José JoaquínDevillers, BertrandGarcía-Armada, Ana2015-06-112015-06-112014-03IEEE Trans. on Vehicular Technology 63 (2014) 3, pp. 1178 - 11920018-9545https://hdl.handle.net/10016/21087We present a cross-layer resource-allocation (RA) scheme for the downlink in orthogonal frequency-division multiple-access (OFDMA) systems with fairness control among the users, where the resources to be allocated are power, bits per symbol, and subchannels. The use of subchannels, which are defined as group of subcarriers, leads to reducing the complexity of the bandwidth allocation compared with the commonly adopted subcarrier allocation. A goodput-based optimization function, which is derived by combining automatic repeat request (ARQ) and physical (PHY)-layer parameters, is used to perform RA for applications that demand error-free transmissions. Two transmission strategies are considered, with and without concatenation of subchannels, for which two different RA methods are developed, respectively. We also propose an algorithm that improves the complexity associated to both concatenation and nonconcatenation schemes, without appreciable performance loss.15application/pdfeng© 2013 IEEEAutomatic repeat request (ARQ)cross-layer resource allocation (RA)fairnessgoodputmultiuser orthogonal frequency-division multiplexing (OFDM)subchannelpower allocationmultiuser OFDMproorctional fairnesssystemsnetworsoptimizationadaptationCSITtransmissionmaximizationresearch articleTelecomunicaciones10.1109/TVT.2013.2281367open access117831192IEEE Transactions on Vehicular Technology63AR/0000014805