Dynamic resource distribution method of orthogonal frequency division multiplexing (OFDM) system
A technology of dynamic resource allocation and orthogonal frequency division, applied in multi-frequency code systems, transmission systems, digital transmission systems, etc., can solve problems such as low accuracy, unmet demand, and reduction
Active Publication Date: 2013-04-10
GUANGDONG UNIV OF TECH
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Problems solved by technology
This algorithm that converts the resource allocation problem into a two-step algorithm can reduce the complexity of the solution, but because the subcarrier allocation and power allocation are not independent of each other, the accuracy of this two-step method is not high
Many methods introduce the concept of fairness in order to overcome the drawbacks that users with good channel conditions can obtain most of the subcarrier resources while the needs of users with poor channel conditions cannot be met.
Method used
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[0046] The flow chart of the present invention is as figure 1 As shown, the dynamic resource allocation method of the OFDM system of the present invention comprises the following steps:
[0047] 1) Initialize several subcarrier allocation schemes (ρ 1 ,ρ 2 ,…,ρ n ), these allocation schemes are used as the initial population pop of the evolutionary algorithm, each allocation scheme ρ i corresponds to a model that maximizes the system rate;
[0048] 2) Use the KKT algorithm to solve each subcarrier allocation scheme ρ i The corresponding system model, the calculated system speed is , j represents the number of generations performed, i represents the i-th individual in each population, and as ρ i the fitness value;
[0049] 3) Select the individuals in the population pop to enter the genetic operation pool;
[0050] 4) From pop according to the crossover probability p c Select individuals for crossover operation, and the generated new individuals form child;
[0051...
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The invention discloses a dynamic resource distribution method of an orthogonal frequency division multiplexing (OFDM) system. A plurality of carrier wave distribution schemes are used as a population, and each carrier wave distribution scheme is used as an individual. The population is conducted with algorithm operation, KKT conditions in classic optimization algorithm are used for solving the corresponding system module of each carrier wave distribution scheme, and the obtained system capacity values are used as the adaptive values of corresponding individuals. The adaptive value of each individual is used for choosing the individuals from a contemporary population to a next generation population. The KKT conditions are used again for solving the system capacity value of each carrier wave distribution scheme in the current population, and the system capacity value is used as the adaptive value of the corresponding individuals. The above process is conducted alternatively, and the dynamic resource distribution method is achieved. The dynamic resource distribution method of the OFDM system improves solving precision, and meanwhile, the algorithm complexity is not increased. The dynamic resource distribution method of the OFDM system satisfies the real-time requirements of a communication system.
Description
technical field [0001] The invention is a dynamic resource allocation method of an orthogonal frequency division multiplexing system, which belongs to the transformation technology of the dynamic resource allocation method of the orthogonal frequency division multiplexing system. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM for short) is the core technology of the fourth generation mobile communication system. As a special multi-carrier allocation scheme, it can decompose the serial data stream into several parallel sub-data streams for simultaneous transmission, thus effectively combating inter-symbol interference and frequency selectivity of wireless channels. Therefore, OFDM is considered by many scholars to be the last generation of modulation technology. Since the subcarriers in the OFDM system are independent of each other, each subcarrier can be independently modulated and demodulated, so the OFDM system can flexibly select the subca...
Claims
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Login to View More IPC IPC(8): H04L5/00H04L27/26H04L12/917H04L47/76
Inventor 刘海林王强
Owner GUANGDONG UNIV OF TECH