Increment iteration power allocation method
A technology of incremental iteration and distribution method, applied in the field of power distribution, to achieve the effect of reducing the amount of computation, high performance, and reduced amount of computation
Inactive Publication Date: 2013-05-08
HARBIN ENG UNIV
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Most of the current research puts power allocation in the OFDM or OFDMA system, and combines it with subcarrier allocation, adjustment mode selection, and bit allocation to form a joint optimization problem, and is based on the water injection allocation strategy. Relatively little research has been done on optimization
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[0026] combine figure 1 , the patent of the present invention provides a quasi-optimal power allocation method that only performs one incremental iteration in a time-varying channel multi-user downlink system. In the following description, it is assumed that the base station is configured with one transmit antenna, and the total transmit power is P all , there are a total of N user receivers in the system, and the power allocation has been completed at time t-1 and related information is stored, that is, the instantaneous SNR of the nth user subchannel γ n (t-1) and theoretical power distribution value P n (t-1), n=1, ... N, then the specific implementation steps of re-distributing power at time t are as follows:
[0027] 1. First, the base station detects the state of each user sub-channel through the training sequence, and obtains the instantaneous signal-to-noise ratio γ of the nth user sub-channel at time t n (t), n=1, . . . N.
[0028] 2. Calculate the SNR increment o...
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The invention provides an increment iteration power allocation method. The method comprises the following steps of: detecting at a base station to acquire the instantaneous signal to noise ratio of each user sub-channel at the moment; calculating the signal to noise ratio increment of each user sub-channel at the moment according to the known instantaneous signal to noise ratio of each user sub-channel at the previous moment, and performing weighted average on the signal to noise ratio increment of each user sub-channel at the moment to acquire the average signal to noise ratio increment of the whole channels; calculating to acquire the power increment value of each user at the moment; calculating to acquire the theoretical power allocation value of each user at the moment; adjusting the theoretical power allocation value of each user to acquire the practical power allocation value of each user; and updating a power allocation strategy at the moment and storing the instantaneous signal to noise ratio and the theoretical power allocation value of each user sub-channel at the moment. The method is applied to a time-varying channel, is only associated with a channel state and the power allocation strategy at the previous moment, has low computational volume and can achieve high performance almost accordant with the optimal water injection strategy.
Description
technical field [0001] The invention provides a power allocation method, in particular a power allocation method capable of tracking channel state changes for real-time update, maintaining high performance and reducing computational complexity in a time-varying channel multi-user downlink system. Background technique [0002] Improving channel capacity and utilizing resources efficiently is one of the goals of wireless communication. In the downlink of a multi-user cellular communication system, the base station often communicates with multiple users at the same time, and its transmission power is limited. Therefore, an important issue is how to allocate the limited transmission power to each user as much as possible. Maximum system capacity possible. Palomar et al. used Game-Theoretic to prove that when the sender knows nothing about the channel state information, the strategy of equal power allocation is the best choice, but the system performance is limited by the user s...
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IPC IPC(8): H04W52/24
Inventor 郭冬梅张曙
Owner HARBIN ENG UNIV