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Multicarrier-based adaptive modulation method

An adaptive modulation and multi-carrier technology, applied in the field of communication, can solve the problems of high complexity, achieve the effect of reducing complexity and achieving the effect of transmitting power

Inactive Publication Date: 2013-12-11
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing Greedy algorithm has high complexity in processing adaptive modulation, and proposes a multi-carrier-based adaptive modulation method

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Embodiment Construction

[0017] The present invention will be further elaborated below in conjunction with the accompanying drawings and specific embodiments.

[0018] CI-OFDM is a new mechanism proposed in recent years. While retaining OFDM's high spectrum utilization and the ability to resist frequency selective fading, CI-OFDM extends each channel of low-speed parallel data to all sub-channels with orthogonal CI codes. Simultaneous transmission on the carrier, thus resulting in frequency domain diversity gain, compared with the traditional OFDM system has better BER performance. In the CI-OFDM system, the CI code can evenly stagger the time-domain waveform peaks of each data modulation, and no longer add many random sinusoidal signals like OFDM, thus eliminating the peak-to-average power ratio (Peak-to-Average Power Ratio, PAPR) is too high.

[0019] In the present invention, when the service quality and the transmission rate are constant, aiming at optimizing the transmission power, aiming at the...

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Abstract

The invention discloses a multicarrier-based adaptive modulation method belonging to the technical field of communication. The method is improved on the basis of a traditional Greedy adaptive bit allocation method, and m bits are allocated to a subcarrier every time, thus, the complexity in computing is reduced; meanwhile, whether to carry out CI (Carrier Interferometry) expansion or OFDM (Orthogonal Frequency Division Multiplexing) transmission is determined according to the frequency domain response of each subchannel, and furthermore, respective advantages of OFDM and CI-OFDM are combined so that the optimization of transmitting power is realized under the condition that the service quality and the transmission rate are fixed.

Description

technical field [0001] The invention belongs to the technical field of communication, and relates to adaptive modulation of OFDM systems of Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) and carrier interference (CI, Carrier Interferometry). Background technique [0002] Adaptive modulation is to adjust the modulation mode of each sub-carrier according to the condition of each sub-channel. That is, when the sub-channel environment is good, more bits are allocated on the sub-carrier, and high-order modulation is used to obtain a higher data rate; when the sub-channel environment is poor, more bits are allocated on the sub-carrier. Small number of bits, using low-order modulation. [0003] The Greedy algorithm is an adaptive modulation method used in OFDM or multi-carrier systems. In each iteration of the algorithm, it only allocates 1 bit, and this bit is allocated to the subcarrier that only needs to increase the minimum trans...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L1/00
Inventor 陈肖虎王军李少谦
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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