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Self-adapting bit power allocation method based on bit preallocation

A distribution method and special power technology, applied in power management, electrical components, sustainable buildings, etc., can solve the problems of reducing algorithm implementation complexity and implementation complexity, and achieve the effect of reducing time complexity and avoiding iterative process

Inactive Publication Date: 2009-10-21
BEIHANG UNIV
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  • Claims
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Problems solved by technology

In order to solve the implementation complexity and real-time problems of the existing adaptive bit power allocation method for OFDM systems, the purpose of the present invention is to provide a kind of adaptive bit power allocation method based on bit pre-allocation, which is based on the MA optimization criterion On the basis of this, the greedy algorithm is improved, that is, under a certain bit error rate and information rate, a part of the bits are pre-allocated to the sub-channel whose sub-channel gain is greater than the average channel gain, and then the remaining bits are allocated through the traditional greedy algorithm. This minimizes the total transmit power and reduces the complexity of algorithm implementation

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  • Self-adapting bit power allocation method based on bit preallocation

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Embodiment Construction

[0056] See figure 1 , figure 2 As shown, taking the OFDM communication system with the number of subcarriers as N as an example, considering that the optional modulation modes of adaptive modulation are non-transmission, QPSK, 16QAM and 64QAM, an adaptive bit power allocation method based on bit pre-allocation in the present invention , the specific steps of the method are as follows:

[0057] Step 1: Instantaneous CSI estimation

[0058] The receiving end obtains the instantaneous CSI corresponding to all subcarriers through channel estimation, that is, α i (i=1, 2, . . . , N).

[0059] Step 2: Bit pre-allocation

[0060] (1) Calculate the average channel gain ga = Σ i = 1 N α i / N ;

[0061] (2) Assign bits C to subcarriers with channel gain greater than ga n (i)=C n =3, the numbe...

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Abstract

The invention relates to a self-adapting bit power allocation method based on bit preallocation, which comprises the following four steps: step one: instantaneous CSI estimation; step two: bit preallocation; step three: bit unit single-step allocation; and step four: calculations of a power formula 1 of each subcarrier and a total power formula 2. The method uses a bit preallocation strategy to preallocate part of the bits to a subchannel of which the subchannel gain is larger than the average channel gain to avoid part of the iterative processes; and simultaneously, a preestablished index table can look up a table to take out f (Cn(i)) to avoid repeated calculations in each iterative process, reduce the algorithm complexity to great extent and improve the operational speed, thus the method is quite applicable to systems with high real-time requirement. On the other hand, after the bit preallocation, a greedy algorithm is further used for allocating the remaining bits so that the method has high transmission efficiency and power efficiency. The method has broad utility value and application prospect in the field of wireless communication.

Description

(1) Technical field: [0001] The invention relates to an adaptive bit power allocation method in a wireless communication system, in particular to an adaptive bit power allocation method based on bit pre-allocation with high power efficiency and relatively low complexity. The method is applicable to all wireless communication systems adopting Orthogonal Frequency Division Multiplexing (OFDM) technology or Multiple-Input Multiple-Output OFDM (MIMO-OFDM) technology, and belongs to the technical field of adaptive transmission. (2) Technical background: [0002] OFDM technology has attracted more and more attention because it can effectively resist multipath interference and frequency selective fading, and has good high-speed data transmission capability and easy implementation. It has been identified as the next generation mobile communication system core technology. [0003] Multipath frequency selective fading and time variation are two characteristics of wireless channels. ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W52/04H04L27/26
CPCY02B60/50
Inventor 修春娣李楠齐电海
Owner BEIHANG UNIV
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