Title :
Towards higher data rates for IS-136
Author_Institution :
AT&T Bell Labs., Florham Park, NJ, USA
Abstract :
IS-136+ aims to increase the data rate of IS-136 by using higher modulation formats such as 8-PSK or 16-QAM. It is necessary to adaptively switch between these formats to maintain optimal throughput as the SNR varies. Adaptive modulation is a non-trivial task in practice, because accurate SNR measurements are required, the interference may change more quickly than the feedback round trip, and the optimal switching points are a function of the mobile speed. As an alternative, we present an incremental redundancy ARQ retransmission scheme that not only significantly reduces the dependence on mode switching but also increases the average throughput by 20%
Keywords :
adaptive modulation; automatic repeat request; cellular radio; data communication; phase shift keying; protocols; quadrature amplitude modulation; 16-QAM; 8-PSK; IS-136; IS-136+ cellular radio; SNR; adaptive modulation; increased data rates; incremental redundancy ARQ retransmission scheme; modulation formats; optimal switching points; optimal throughput; radio link protocol; Automatic repeat request; Bismuth; Cyclic redundancy check; Feedback; Interference; Modulation; Switches; Throughput; Transport protocols; Velocity measurement;
Conference_Titel :
Vehicular Technology Conference, 1998. VTC 98. 48th IEEE
Conference_Location :
Ottawa, Ont.
Print_ISBN :
0-7803-4320-4
DOI :
10.1109/VETEC.1998.686189
