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Fraction time sampling based filter group and filtering method

A filter bank and fractional multiplication technology, which is applied in baseband system components, shaping network in transmitter/receiver, multi-frequency code system, etc., can solve the problem of loss of FFT chip compatibility, inconsistent equalization performance, frequency domain Problems such as different balance points

Inactive Publication Date: 2007-12-05
SHANGHAI RES CENT FOR WIRELESS COMM
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Problems solved by technology

But it is difficult to set Q as a power of 2 within a reasonable data block length, because N is always slightly larger than M
Therefore, the number of points in the frequency domain equalization (FDE) of the receiver is not a power of 2, which increases the complexity of FDE and loses compatibility with existing FFT chips
In addition, if the total number of subbands M is not adjusted to the power of 2, by adjusting the shifted orthogonal interval N and the number of waveform symbols D, the cyclic data block length Q is the power of 2, but in a reasonable data block length It is difficult to set Q as an integer multiple of M in the range
In this way, in FDE, the number of frequency domain equalization points corresponding to each subband will be different, resulting in inconsistent equalization performance

Method used

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  • Fraction time sampling based filter group and filtering method
  • Fraction time sampling based filter group and filtering method
  • Fraction time sampling based filter group and filtering method

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Embodiment Construction

[0052] As shown in Figure 1, a filter bank based on fractional sampling includes:

[0053] The phase rotation device 10 is used for multiplying the input parallel coincidence data block by the phase rotation factor in time sequence;

[0054] The IFFT transformation device 11 is used to perform M-point IFFT transformation on the output result of the phase rotation device;

[0055] M upsampling devices (120, 121, 122, ...) are respectively used to perform an R-fold upsampling operation on each element in the IFFT-transformed data block;

[0056] M time-varying polyphase shaping filter devices (130, 131, 132, ...), respectively used to perform time-varying sub-band filtering shaping operations on the upsampled sequences;

[0057] Parallel / serial conversion device 14, for carrying out parallel-serial conversion to the data from M time-varying polyphase shaping filter devices input in parallel;

[0058] The waveform synthesizing device 15 is used for shifting and superposing the ...

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Abstract

The invention supplies filter bank and filtering method based on fraction times sampling. For the M belt filter bank, adjusted symbol data block is processed time change phase rotation, M point IFFT change, R times upper sampling, time change poly-phase filtering, parallel serial convert, motion superpose, then output. The signal is discrete sampling sequence. The transmission system adopts fraction times sampling filter bank. The receiver frequency domain balanced size can be 2-th power. Thus frequency domain balance can adopt effective FFT operation to realize. Meanwhile, the receiver frequency domain balanced size is integral multiple of the sub-band sum M to ensure each sub-band frequency domain balanced point same.

Description

technical field [0001] The invention relates to a method and device for realizing a multi-subband filter bank. Background technique [0002] In recent years, the transmission bandwidth of wireless communication systems has become wider and wider. In broadband mobile communications and broadband wireless access networks, multiple access technologies are used to support multi-user data transmission, including FDMA, TDMA and CDMA. Considering improving the throughput of the system, combining FDMA and TDMA becomes the main trend. At present, the FDMA system can be realized by multi-carrier frequency division multiple access (MC-FDMA) and single carrier frequency division multiple access (SC-FDMA). MC-FDMA has better granularity and can adopt simple frequency domain equalization, but the peak-to-average ratio (PAPR) is higher. Therefore, it is usually used in the downlink of broadband wireless communication. Like MC-FDMA, SC-FDMA has the characteristics of flexible resource s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04L27/26
Inventor 李明齐张小东周斌唐琳周平王海峰
Owner SHANGHAI RES CENT FOR WIRELESS COMM
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