On constant power water-filling
نویسندگان
چکیده
This paper derives a rigorous performance bound for the constant-power water-filling algorithm for ISI channels with multicarrier modulation and for i.i.d. fading channels with adaptive modulation. Based on the performance bound, a very-low complexity logarithm-free power allocation algorithm is proposed. Theoretical worstcase analysis and simulation show that the approximate water-filling scheme is close to optimal.
منابع مشابه
Power Minimization Under Constant Throughput Constraint in Wireless Networks with Beamforming
In multi-access wireless communication systems, power control and adaptive modulation are two important means to increase spectral efficiency, combat with time varying fading environment, and reduce co-channel interference. In this paper, the overall transmitted power is minimized by using adaptive MQAM modulation. Each link can select a range of different MQAM modulation according to its curre...
متن کاملAsymptotically optimal water-filling in vector multiple-access channels
Dynamic resource allocation is an important means to increase the sum capacity of fading multiple-access channels (MACs). In this paper, we consider vector multiaccess channels (channels where each user has multiple degrees of freedom) and study the effect of power allocation as a function of the channel state on the sum capacity (or spectral efficiency) defined as the maximum sum of rates of u...
متن کاملPower Allocation for Capacity Maximization in Eigen-mimo with Output Snr Constraint
Water-filling is the power allocation that maximizes the parallel-channel eigen-MIMO informationtheoretic capacity. However, for practical designs, designing for error performance is also important. The overall uncoded error rate, in a system with water-filled eigen-channels using digital modulation, degrades through the errors in the data that uses the weaker eigen-channels. This is because in...
متن کاملProposed Water filling Model in a MIMO system
In the paper we have discussed the proposed water filling algorithm which has been used for allocating the power to the MIMO channels so as to enhance the capacity of the MIMO network. Here we present a theoretical framework for allocating the power here we have considered a 4x4 MIMO system the system is assumed to be MIMO-OFDM and the channel is assumed to be Flat as under this the convolution...
متن کاملTest Power Reduction by Simultaneous Don’t Care Filling and Ordering of Test Patterns Considering Pattern Dependency
Estimating and minimizing the maximum power dissipation during testing is an important task in VLSI circuit realization since the power value affects the reliability of the circuits. Therefore during testing a methodology should be adopted to minimize power consumption. Test patterns generated with –D 1 option of ATALANTA contains don’t care bits (x bits). By suitable filling of don’t cares can...
متن کامل