Aggressive modulation/coding scheme selection for maximizing system throughput in a multi-carrier system

Multi-carrier modulation techniques, such as OFDM, are attractive propositions for the design of future broadband wireless communication systems due to higher spectral efficiency than CDMA. A capacity enhancing technique to be commonly used in these systems is adaptive modulation/coding (AMC) for li...

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Vydané v:2005 IEEE 61st Vehicular Technology Conference Ročník 5; s. 3038 - 3042 Vol. 5
Hlavní autori: Talukdar, A., Sartori, P., Cudak, M., Classon, B., Blankenship, Y.
Médium: Konferenčný príspevok..
Jazyk:English
Vydavateľské údaje: IEEE 2005
Predmet:
Adaptive control
Adaptive Modulation and Coding
Adaptive systems
Automatic repeat request
Broadband communication
hybrid ARQ
MCS selection
Modulation coding
Multiaccess communication
OFDM modulation
Programmable control
system capacity
Throughput
Wireless communication
ISBN:9780780388871, 0780388879
ISSN:1550-2252
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Abstract Multi-carrier modulation techniques, such as OFDM, are attractive propositions for the design of future broadband wireless communication systems due to higher spectral efficiency than CDMA. A capacity enhancing technique to be commonly used in these systems is adaptive modulation/coding (AMC) for link adaptation. With AMC, the modulation and coding scheme (MCS) is selected based on the channel quality information. MCS selection is an imperfect process by nature, due to, for example, the variability of the channel. Moreover, since the set of available MCSs is quantized, it is not always possible to select the optimal rate. Using these non-optimal MCS values results in reduced system capacity. This paper describes a method that attempts to maximize system and user throughputs in a multi-carrier system by overcoming the impacts of such non-optimal MCS selection through the use of hybrid ARQ (HARQ). This method relies on aggressive MCS selection and multiple HARQ transmissions. The performance impact of this method on various types of packet data applications is evaluated by system level simulation. Simulation results indicate that significant system and user throughput gains can be achieved by this method.
AbstractList Multi-carrier modulation techniques, such as OFDM, are attractive propositions for the design of future broadband wireless communication systems due to higher spectral efficiency than CDMA. A capacity enhancing technique to be commonly used in these systems is adaptive modulation/coding (AMC) for link adaptation. With AMC, the modulation and coding scheme (MCS) is selected based on the channel quality information. MCS selection is an imperfect process by nature, due to, for example, the variability of the channel. Moreover, since the set of available MCSs is quantized, it is not always possible to select the optimal rate. Using these non-optimal MCS values results in reduced system capacity. This paper describes a method that attempts to maximize system and user throughputs in a multi-carrier system by overcoming the impacts of such non-optimal MCS selection through the use of hybrid ARQ (HARQ). This method relies on aggressive MCS selection and multiple HARQ transmissions. The performance impact of this method on various types of packet data applications is evaluated by system level simulation. Simulation results indicate that significant system and user throughput gains can be achieved by this method.
Author Cudak, M.
Talukdar, A.
Classon, B.
Sartori, P.
Blankenship, Y.
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  organization: Motorola Labs, Schaumburg, IL, USA
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Snippet Multi-carrier modulation techniques, such as OFDM, are attractive propositions for the design of future broadband wireless communication systems due to higher...
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StartPage 3038
SubjectTerms Adaptive control
Adaptive Modulation and Coding
Adaptive systems
Automatic repeat request
Broadband communication
hybrid ARQ
MCS selection
Modulation coding
Multiaccess communication
OFDM modulation
Programmable control
system capacity
Throughput
Wireless communication
Title Aggressive modulation/coding scheme selection for maximizing system throughput in a multi-carrier system
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