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Frequency domain equalization device based on compressed encoding and method therefor
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A compression coding and frequency domain equalization technology, applied in baseband system components, shaping networks in transmitters/receivers, digital transmission systems, etc. Storage space and other issues, to achieve the effect of saving hardware resources and software computing resources, improving performance, and improving computing accuracy
Inactive Publication Date: 2012-06-20
INST OF MICROELECTRONICS CHINESE ACAD OF SCI
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Complex number division is hard to implement directly
Complex number division is implemented by hardware, which requires a lot of chip area; implemented by software, it takes a lot of computing time; using the traditional table lookup method, it takes a lot of storage space
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Embodiment 1
[0042] Embodiment 1: Using PCM A-Law compression coding method
[0043] The size of the table in this embodiment of the present invention has 128 Half Words (ie 64 Words) in total, using 0-127 as an index, and according to the nature of PCM compression coding, each code word corresponds to one or more data. When a codeword corresponds to a data, if the data is 1 or 0, store 32767; otherwise, if the data is not 1 or 0, take the reciprocal of the data, shift the reciprocal to the left by 15 bits, and store it in the corresponding table inside. When a code word corresponds to multiple data, take the reciprocal of the average of these data, shift left 15 bits and store in the corresponding table.
[0044] The present invention adopts the A-Law compression coding method of PCM to realize the frequency domain equalization method based on compression coding such as figure 2 As shown, the specific steps are as follows:
[0045] Step 1: Combine the obtained Y(k) with Multiplying ...
Embodiment 2
[0051] Embodiment 2: The PCM μ-Law compression coding method is adopted.
[0052] The table size of the present invention in this one embodiment has 128 Half Words (being 64 Words) altogether, uses 0-127 as index, according to the character of PCM compression coding, each code word corresponds to one or more data, When a codeword corresponds to a data, if the data is 1 or 0, store 32767; otherwise, if the data is not 1 or 0, take the reciprocal of the data, shift the reciprocal to the left by 15 bits, and store it in the corresponding table inside. When a code word corresponds to multiple data, take the reciprocal of the average of these data, shift left 15 bits and store in the corresponding table.
[0053] Using the μ-Law compression coding method of PCM to realize the frequency domain equalization method based on compression coding, such as image 3 As shown, the specific steps are as follows:
[0054] Step 1: Combine the obtained Y(k) with Multiplying the conjugates o...
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Abstract
The invention relates to the technical field of digital communication equalization, and discloses a frequency domainequalization device based on compressed encoding and a method therefor. The device comprises a division conversion unit, a divider limiting and compressed encoding unit, a divider table look-up and reciprocal solving unit and a reciprocal multiplication equalization unit, wherein the division conversion unit converts plural division into real division; the divider limiting and compressed encoding unit limits dividers in a selected compressed encoding manner, and conducts compressed encoding to limited data to obtain a digit; the divider table look-up and reciprocal solving unit adopts the digit received from the divider limiting and compressed encoding unit as an index for table look-up, so as to obtain the reciprocal of a divider moved N bits to the left; and the reciprocal multiplication equalization unit multiplies a dividend received from the division conversion unit and a reciprocal received from the divider table look-up and reciprocal solving unit, and moves the result by N bits to the right, so as to obtain and output the equalized data. In the invention, the simple multiplication and the compressed table look-up method can be utilized to quickly realize equalization among all communication systems.
Description
technical field [0001] The invention relates to the technical field of digital communication equalization, in particular to a frequency domain equalization device and method based on compression coding. Background technique [0002] With the continuous advancement of communication technology and the continuous improvement of information transmission rate, the requirements for digital communication systems are also getting higher and higher. Among them, equalization technology is a bottleneck, especially in wireless communication systems. The traditional equalizer is a time-domain equalizer. As the wirelesstransmission rate becomes higher and higher, the complexity of the time-domain equalizer becomes higher and higher. In order to be compatible with single carrier and multi-carrier, and to reduce system complexity and improve system performance, a method of frequency domain equalization has emerged. [0003] The process of receiving data by an existing digital communicati...
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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04L1/00
Inventor 吴凯管武梁利平
Owner INST OF MICROELECTRONICS CHINESE ACAD OF SCI
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