-
[show abstract]
[hide abstract]
ABSTRACT: This paper proposes a novel dynamic bandwidth allocation scheme with fast response, which significantly reduces the processing-speed requirement of the optical line terminal. Moreover, the scheme can provide high bandwidth efficiency while ensuring a bandwidth guarantee.
Optical Fiber Communication Conference, 2005. Technical Digest. OFC/NFOEC; 04/2005
-
[show abstract]
[hide abstract]
ABSTRACT: An improved Chase combining scheme is proposed to take advantage of the channel quality feedback information, which is mandatory for adaptive modulation and coding (AMC) schemes, to enhance the throughput of OFDM based mobile communication systems. By comparing the signal-to-noise ratio (SNR) measured on sub-carriers with a predetermined threshold, the data to be retransmitted are selected and mapped onto the sub-carriers that have better channel quality to achieve higher diversity gain in the next retransmission. Simulation results prove that such an operation can reduce the amount of retransmitted data and the resource usage in retransmission, which leads to higher throughput efficiency than conventional Chase combining schemes.
Vehicular Technology Conference, 2004. VTC 2004-Spring. 2004 IEEE 59th; 06/2004
-
[show abstract]
[hide abstract]
ABSTRACT: In contemporary wireless networks such as UMTS, one of the important problems is a scheduled sharing of the wireless link for different packet streams, according to a couple of mutually restricted principles, of which one is throughput and the other fairness. In this paper, a rank statistic based hybrid packet scheduling for downlink shared channel (DSCH) in the WCDMA system is presented, which compatibly and simultaneously considers both throughput and fairness principles. Subsequently, simulation results indicate that the proposed algorithm and respective scheme achieves the twin goals of improving throughput and ensuring fairness among the packet flows with the same priority and also guarantees reasonable distinguishing among flows with different priorities. As a conclusion, the proposed scheme has advantages in optimizing resource utilization over the traditional ones originally used in the medium access control (MAC) layer in WCDMA.
3G Mobile Communication Technologies, 2004. 3G 2004. Fifth IEE International Conference on; 02/2004
-
[show abstract]
[hide abstract]
ABSTRACT: In this paper, an equalization technique with low computational complexity is proposed for time-variant multipath channel in OFDM system. Under the assumption that channel impulse response (CIR) varies linearly within one OFDM symbol, this technique utilizes the property of Toeplitz matrix and fast Fourier transform (FFT) matrix to obtain the interchannel interference (ICI) terms in frequency domain with very low complexity, and Jacobi stationary iterative algorithm is proposed to compensate these ICI terms in manner of matrix.
Vehicular Technology Conference, 2003. VTC 2003-Fall. 2003 IEEE 58th; 11/2003
