OFDM (Orthogonal Frequency Division Multiplexing) dynamic resource allocation method

Abstract

The invention relates to an OFDM (Orthogonal Frequency Division Multiplexing) dynamic resource allocation method which belongs to the technical field of digital communication and is finished by an adaptive resource allocation module. The adaptive resource allocation module is formed by sequentially connecting a parameter initialization module, a bit allocation module, a boundary adjusting and judging end condition module. The method comprises the following steps of: (1) firstly, inputting a parameter value into the parameter initialization module to be initialized before performing; (2) inputting a parameter initial value which is output by the parameter initialization module into the bit allocation module and calculating bit numbers allocated on all subcarriers; (3) inputting an allocated overall bit number, a target bit number, an upper limit and a lower limit of a boundary and an upper limit and a lower limit of the allocated overall bit number into the boundary adjusting and judging end condition module, adjusting the position of the boundary and judging whether an end condition is satisfied or not; and (4) finishing the bit allocation and the power allocation on all sub-channels in a symbol period and carrying out resource allocation of the next symbol period. The overall complexity of the method is lower than the overall complexities of all suboptimal algorithms.

Description

technical field [0001] The invention relates to dynamic resource allocation in a single-user OFDM system, in particular to a fast and simple adaptive resource allocation method for OFDM dynamic resources. Background technique [0002] In recent years, wireless communication technology is developing rapidly. With the increase of users' demand for various real-time multimedia services and the rapid development of Internet technology, it can be expected that the future wireless communication technology will have a higher data transmission rate to meet the needs of more users and provide users with More convenience. Among the various wireless solutions that can provide high data rate transmission at present, Orthogonal Frequency Division Multiplexing (OFDM) technology has received extensive attention due to its advantages of high spectrum utilization and strong anti-interference ability. However, in the traditional OFDM system, the performance of the system is limited by the w...

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Problems solved by technology

The Chow algorithm uses an iterative method to continuously adjust the margin value, so that the number of allocated bits is as close as possible to the required target number of bits within the set maximum number of iterations, and then adjusted bit by bit. The algorithm distributes the power evenly to each subcarrier The complexity of the algorithm is reduced, but the optimal result cannot be achieved, and the algorithm often oscillates and never converges under certain channel conditions; the Jang algorithm is an algorithm based on water injection line iteration, which continuously adjusts the value of the water injection line , using the water injection principle to allocate bits and power on each sub-channel, but this algorithm, like the Chow algorithm, will oscillate and never converge under certain channel conditions, and the algorithm ends with the allocation power being less than the target power. this is very unreasonable

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