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In this paper, a linearly coded (LC) relaying scheme is proposed for multiuser relay network in which a number of users communicate simultaneously with a common destination with the help of one relay node, by using orthogonal frequency division multiple access (OFDMA). The proposed linear coding at the relay node enables exploiting the frequency diversity in the relay-to-destination (R-to-D) link...
We propose a strategy that optimally schedules and allocates users for adaptive modulation and coding based orthogonal frequency multiple access systems (AMC-OFDMA). This strategy aims to maximize the average system throughput as a function of bit error rate (BER) and spectral efficiency by exploiting the user diversity. It sorts the available users of an assigned base station (BS) in queues based...
Resources allocation of OFDM system is a key factor that affects system performance. Parteek Bansal proposed a bit-power allocation algorithm under different bit error rate (BER). But the process of its bit allocation will cause high complexity and bad real-time to build a power-increment table. In this paper, a low-complexity multi-user subcarrier-bit-power allocation algorithm for wireless OFDMA...
In this work, we shall propose an OFDMA system based on the allocation of orthogonal subcarrier groups to multi- rate user classes. This system can be regarded as an evolution of GO-OFDMA used for single-rate data transmission. A user data stream is split into a multiple substreams, whose number depends on the user data rate. Then, each substream is spread by a distinct spreading code and, finally,...
We consider the uplink of a multi-cell orthogonal frequency division multiple access (OFDMA) system that employs multiple (M > 1) receive antennas and maximum ratio combining at the base station. We propose a model that captures the impact of intercell interference coordination on the modulation and coding scheme dependent bit error rate (BER) performance. We analyze this model in two steps. First,...
Beyond third generation (B3G) mobile communication systems may allow users to simultaneously launch multiple multimedia applications with very diverse quality of service (QoS) requirements. In order to achieve resource efficiency, if two applications of the same user have different bit-error-rate (BER) constraints, depending on the multi-user mutiple access technology, the symbols of these two applications...
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