A real time QoS aware adaptive radio resource management algorithm for downlink of multi-cell and multi user MIMO-OFDMA system. This purposed scheduling algorithm takes account queue status, transmission rates, channel state information and priority of the user for subcarrier, power and bit allocation in MU-MIMO-OFDMA system. Subcarrier selection is based on the priority of the user and eigenva...

Background Under the guideline of Circular Letter LCCE/153, TTA has formed evaluation group (TTA EG) to test, said, IP-OFDMA for the 6th radio interface of IMT-2000. TTA would like to share the progress of evaluation to other groups and proponents and to clarify the questions in the relevant ITU-R Documents and comments provided by the Proponents in the contributions, 8F/1065 and 1079r1. We hav...

In order to efficiently utilize limited radio resources, resource allocation schemes in OFDMA-based wireless networks have gained intensive attention recently. Instead of improving the throughput performance, the utility is adopted as the metric for resource allocation, which provides reasonable methods to build up the relationship between user experience and various quality-of-service (QoS) me...

Abstract—In this paper we investigate filtered multitone modulation (FMT) for broadband multiuser powerline communications. FMT generalizes the popular OFDM scheme through the deployment of sub-channel shaping filters. We address the implementation problem, and we derive a novel efficient digital implementation of both the synthesis filterbank and the analysis filterbank assuming to multiplex t...

AbstractPeak to Average power ratio is the problem being faced in multicarrier system, for Long term evolution(LTE) research is being done for a kind of system that is having lesser PAPR. Single carrier Frequency division multiple access (SC-FDMA) and Orthogonal frequency division multiple access (OFDMA) are major part of LTE. OFDMA was well utilized for achieving high spectral efficiency in co...

In this paper, a new subcarrier allocation algorithm is proposed for an OFDMA relay network with multicells. In the proposed algorithm, subcarriers are allocated to users and relays so as to maximize the overall sum of the achievable rate under fairness constraints. Fairness constraints are imposed on the minimum rate requirement of users and the maximum power of base stations and relays. Simul...

In this letter, we propose an adaptive transmission method for an OFDMA system supporting both band-AMC and diversity modes in a frame, simultaneously. In the proposed method, users are classified into the two groups preferring the band-AMC mode or the diversity mode based on their channel parameters. Then the BS performs resource allocation to maximize the throughput. It is observed that the p...

The performance of frequency domain differentially encoded quadrature phase shift keying (FDQPSK) 26 Mb/s orthogonal frequency division multiple access (OFDMA)-systems with respect to phase noise and time-variant frequency-selective fading is analyzed. FDQPSK completely eliminates the common phase error (CPE) when used in combination with a pilot carrier. Despite its higher sensitivity to inter...

This paper considers the issue of optimal subcarrier allocation in OFDMA. We show, via a counter example, that water-filling based subcarrier allocation policies, contrary to conventional wisdom, fail to provide rate-stability for an otherwise stabilizable OFDMA system. Water-filling is too myopic when considering longtime average performance, e.g. delay, queue lengths, and even long-run throug...