Abstract
We examine the performance gains from two variants of adaptive coding and modulation (ACM) in an OFDM-based cellular system with realistic system parameters. In this system a channel-aware scheduler allocates to each active user a set of subchannels, upon which the users may perform link adaptation with ACM. We investigate the achievable performance gain by frequency-selective ACM, in comparison to non frequency-selective adaptation. Since the scheduler, which is aware of the channel and the traffic conditions, already exploits the multi-user diversity and tends to allocate similar subchannels to a given user, it is not obvious that frequency-selective link adaptation achieves a signifi- cant performance gain, especially when realistic ACM with limited granularity is considered. In this paper, we evaluate the gain of frequencyadaptive vs. non frequency-adaptive transmission for the uplink under realistic conditions for a 4G system proposal.
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Pfletschinger, S. (2007). The Influence of Link Adaptation in Multi-User OFDM. In: Plass, S., Dammann, A., Kaiser, S., Fazel, K. (eds) Multi-Carrier Spread Spectrum 2007. Lecture Notes Electrical Engineering, vol 1. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-6129-5_19
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DOI: https://doi.org/10.1007/978-1-4020-6129-5_19
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