Threshold handover decision method for adaptive modulation coding

Abstract

The invention discloses a threshold handover decision method for adaptive modulation coding, which comprises the following steps of: after a signal to noise ratio decision interval is obtained according to maximum throughput criterions, in an adaptive decision process, performing decision and handover on modulation coding modes according to the pre-obtained signal to noise ratio decision interval, and sequencing the modulation coding modes according to priorities; under a current signal to noise ratio value, comparing bit error rate pre-estimation values corresponding to the modulation codingmodes of each priority with a maximum bit error rate index value; and finally selecting the modulation coding mode to perform coding and modulation on data according to the requirements of a system on maximum throughput and a bit error rate. In the method provided by the invention, pre-estimation and comparison are performed on the bit error rates under the corresponding modulation coding modes based on maximum throughput decision to compare the bit error rate performance of the modulation coding modes to be adopted step by step, so that the bit error rate of the system is ensured to be low at the same time of the pursuit of the system of high throughput to further improve the overall performance of the system.

Description

technical field [0001] The invention relates to adaptive modulation and coding technology, which is a method for step-by-step comparison, judgment and adjustment of modulation and coding schemes by using signal-to-noise ratio parameters obtained by real-time feedback and bit error rate estimation results under different modulation and coding modes. Background technique [0002] A new generation of ultra-high-speed wireless LAN can achieve a substantial increase in the data rate of the physical layer by adopting link adaptive technology. In the field of wireless local area network technology, the 802.11a / g / n protocol adopts the OFDM technology in the current mainstream technology, wherein, 802.11a / g is for a single antenna, and 802.11n is for multiple antennas. In the indoor communication environment, due to the influence of multipath, the improvement of the performance of the physical layer of wireless LAN is limited. In order to overcome the influence of channel noise and f...

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Problems solved by technology

Although the throughput of the system can be maximized when the modulation and coding mode is decided simply based on the SNR threshold determined by this method, this method does not consider the limit of the maximum bit error rate index. When the maximum bit error rate specified by the system The rate value is relatively low, reaching 10 -5 In the above cases, if the corresponding modulation and coding mode is simply used to encode and modulate the data in certain signal-to-noise ratio intervals, in the process of actual data transmission, the phenomenon that the bit error rate index specified by the system will often not be reached , the data transmission quality of the system cannot be guaranteed

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