A Method for Dynamically Adjusting Data Precision During Deinterleaving
A technology of dynamic adjustment and data accuracy, applied in digital transmission systems, electrical components, and error prevention, etc., and can solve the problems of long deinterleaving coverage time and large storage space occupied by deinterleaving.
Active Publication Date: 2017-05-10
HANGZHOU NATCHIP SCI & TECH
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[0005] After OFDM demodulation, the traditional receiver quantizes the in-phase component I, quadrature component Q, and channel response amplitude H of the constellation points and sends them directly to the de-interleaving module for de-interleaving processing. Due to the long length of de-interleaving coverage, the traditional The practice faces the problem of deinterleaving occupying a large amount of storage
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[0043] The technical solution of the present invention will be described below in conjunction with the accompanying drawings. Without loss of generality, in the following embodiments, for the convenience of description, take X=4, the bit width Wiq of I and Q before compression is 14bit, and the bit width Wh of H is 14bit. Through dynamic precision adjustment, I, Q , H respectively reduce X=4bit, and each constellation point reduces the storage capacity of 4×2+4=12bit in total.
[0044] Such as figure 1 , a method of dynamically adjusting data precision during the deinterleaving process according to the flow in the figure:
[0045] Step 1. Calculate the number of high-order 0s in H and denote it as C, and define the number of bits compressed by precision as X bits; said H is the channel response magnitude of the current constellation point;
[0046] Step 2, define precision compression mode information Fi, Fq, Fh, select and calculate Fi, Fq, Fh according to the value of C, and...
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The invention relates to a method for dynamically adjusting data precision in the de-interleaving process. The method is suitable for a receiver for OFDM signals. According to a traditional receiver, after OFDM demodulation, the cophase component I, the orthogonal component Q and the channel response amplitude H of a constellation point are directly transmitted to a de-interleaving module to be de-interleaved after being quantized, and due to the fact that the time length covered with de-interleaving is large, the existing method causes the problem that de-interleaving occupies large-scale storage. A precision compression module is additionally arranged in front of the de-interleaving module, a precision restoration module is correspondingly and additionally arranged behind the de-interleaving module, the data precision is dynamically adjusted according to the transmitted different signals H, unnecessary sign bits and low data bits are removed, and useful information is reserved as more as possible. According to the method, the necessary precision of the constellation point with poor signal quality is reserved through dynamic adjustment the constellation point with poor signal quality, the bit number of constellation points with the good signal quality is reduced, and the aim of reducing storage under the condition of not influencing the performance of the receiver is achieved.
Description
technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a method for dynamically adjusting data precision in a deinterleaving process. Background technique [0002] One type of channel interference that wireless communication needs to deal with is burst channel interference, which often comes from automobile ignition, high-power electrical switch, etc., and usually manifests as impulse noise interference. This kind of interference is characterized by short duration and concentrated interference energy. This kind of interference signal will often completely submerge the useful communication signal during the interference period. Since the affected information is relatively concentrated, the information error caused by the sudden channel interference will exceed the error correction capability of the subsequent channel error correction module, resulting in communication failure. loss of content. In order to combat this bu...
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IPC IPC(8): H04L1/00
Inventor 邢新景张晓峰刘镇
Owner HANGZHOU NATCHIP SCI & TECH