# US 8,542,573 B2 · Uplink baseband signal compression method, decompression method, device and system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,542,573 B2 - Document ID: US8542573B2 - Status: Granted - Kind: B2 - Application number: 13/622,269 - Filed: 2012-09-18 - Published: 2013-04-04 - Granted: 2013-09-24 - Earliest claimed: 2011-09-30 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Sheng Liu; Rongdao Yu - Web page: https://patentgrep.com/patent/US8542573B2 ## CPC - H04L 27/2636: {with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]} - H03M 7/3059: {Digital compression and data reduction techniques where the original information is represented by a subset or similar information, e.g. lossy compression} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H03M: CODING; DECODING; CODE CONVERSION IN GENERAL (using fluidic means F15C4/00; optical analogue/digital converters G02F7/00; coding, decoding or code conversion, specially adapted for particular applications, see the relevant subclasses, e.g. G01D, G01R, G06F, G06T, G09G, G10L, G11B, G11C, H04B, H04L, H04M, H04N; ciphering or deciphering for cryptography or other purposes involving the need for secrecy G09C) ## Abstract Embodiments of the present invention disclose an RRU, which performs IDFT on a PUSCH signal that is obtained after resource block demapping, where due to a characteristic of an extremely low peak to average power ratio of SC-FDMA modulation, a signal after IDFT has an extremely low peak to average power ratio at this time, and an amplitude range of the signal changes slightly; amplitude/phase conversion is performed on the signal after the IDFT, where the signal after the IDFT is represented by using amplitude and phase, and then amplitude quantization and phase quantization are performed respectively to obtain a quantized amplitude signal and a quantized phase signal respectively. ## Claims ### Claim 1 A baseband data compression device, comprising: a signal obtaining module, configured to obtain a physical uplink shared channel (PUSCH) signal according to an uplink time-domain baseband signal of a user; wherein the signal obtaining module comprises: an uplink baseband signal obtaining unit, configured to obtain an uplink time-domain baseband signal of a user, a cyclic prefix (CP) removing unit, configured to remove a CP of the uplink time-domain baseband signal of the user to obtain a CP-removed uplink time-domain baseband signal, a time-frequency transform unit, configured to perform fast Fourier transform (FFT) on the CP-removed uplink time-domain baseband signal to transform the CP-removed uplink time-domain baseband signal into an uplink frequency-domain baseband signal, and a resource block demapping unit, configured to perform resource block demapping on the uplink frequency-domain baseband signal to separate a PUSCH signal from the uplink frequency-domain baseband signal, wherein the resource block demapping unit is further configured to perform resource block demapping on the uplink frequency-domain baseband signal to separate an uplink reference signal (RS) from the uplink frequency-domain baseband signal; a frequency-time transform module, configured to perform inverse discrete Fourier transform (IDFT) on the PUSCH signal to obtain a time-domain PUSCH signal; an amplitude/phase conversion module, configured to perform amplitude/phase conversion on the time-domain PUSCH signal to obtain an amplitude signal and a phase signal of the time-domain PUSCH signal, wherein the amplitude/phase conversion module is further configured to perform amplitude/phase conversion on the RS to obtain an amplitude signal and a phase signal of the RS; and a quantization module, configured to perform amplitude quantization and phase quantization on the amplitude signal and the phase signal of the time-domain PUSCH signal respectively to obtain a quantized amplitude signal and a quantized phase signal of the time-domain PUSCH signal, wherein the quantization module is further configured to perform amplitude quantization and phase quantization on the amplitude signal and the phase signal of the RS respectively to obtain a quantized amplitude signal and a quantized phase signal of the RS. ### Claim 2 (depends on 1) The baseband data compression device according to claim 1, further comprising: a transmitting module, configured to transmit the quantized amplitude signal and the quantized phase signal of the time-domain PUSCH signal. ### Claim 3 A baseband data compression device, comprising: a signal obtaining module, configured to obtain a physical uplink shared channel (PUSCH) signal according to an uplink time-domain baseband signal of a user; a frequency-time transform module, configured to perform inverse discrete Fourier transform (IDFT) on the PUSCH signal to obtain a time-domain PUSCH signal; an amplitude/phase conversion module, configured to perform amplitude/phase conversion on the time-domain PUSCH signal to obtain an amplitude signal and a phase signal of the time-domain PUSCH signal; a quantization module, configured to perform amplitude quantization and phase quantization on the amplitude signal and the phase signal of the time-domain PUSCH signal respectively to obtain a quantized amplitude signal and a quantized phase signal of the time-domain PUSCH signal; and a coordinate translation module, configured to translate, according to a constellation quadrant where the time-domain PUSCH signal is located, an origin of coordinates to a preset position in the constellation quadrant where the time-domain PUSCH signal is located, and obtain coordinates of the time-domain PUSCH signal after the origin of coordinates is translated; wherein the amplitude/phase conversion module is configured to perform amplitude/phase conversion on the time-domain PUSCH signal according to the coordinates of the time-domain PUSCH signal, wherein the coordinates of the time-domain PUSCH signal are obtained after the origin of coordinates is translated, to obtain an amplitude signal and a phase signal of the time-domain PUSCH signal. ### Claim 4 (depends on 1) The baseband data compression device according to claim 1, further comprising: an RS channel estimation module, configured to perform channel estimation on the RS to obtain an estimated channel of the RS; and a multiple-input multiple-output MIMO detection module, configured to perform MIMO detection on the PUSCH signal according to the estimated channel of the RS to obtain a MIMO-detected PUSCH signal; wherein the frequency-time transform module is configured to perform IDFT on the MIMO-detected PUSCH signal to obtain a time-domain PUSCH signal. ### Claim 5 (depends on 2) The baseband data compression device according to claim 2, wherein the transmitting module is further configured to transmit the quantized amplitude signal and the quantized phase signal of the RS. ### Claim 6 A baseband data decompression device, comprising: a first obtaining module, configured to obtain a quantized amplitude signal and a quantized phase signal of a time-domain PUSCH signal; an I/Q conversion module, configured to perform I/Q conversion on the quantized amplitude signal and the quantized phase signal of the time-domain PUSCH signal to obtain a complex PUSCH signal, wherein the complex PUSCH signal is a complex signal formed by I/Q components; a first transform module, configured to perform discrete Fourier transform (DFT) on the complex PUSCH signal to map the complex PUSCH signal to a frequency domain; a second transform module, configured to perform inverse discrete Fourier transform (IDFT) on the PUSCH signal that undergoes the DFT, to obtain a time-domain PUSCH signal; a demodulation module, configured to perform constellation demodulation on the time-domain PUSCH signal to obtain demodulated data; and a decoding module, configured to perform channel decoding on the demodulated data to obtain uplink data of a user. ### Claim 7 (depends on 6) The baseband data decompression device according to claim 6, further comprising: a second obtaining module, configured to obtain a quantized amplitude signal and a quantized phase signal of an RS. ### Claim 8 (depends on 7) The baseband data decompression device according to claim 7, further comprising: a channel estimation module, configured to perform channel estimation on the quantized amplitude signal and the quantized phase signal of the RS to obtain an estimated signal. ### Claim 9 (depends on 7) The baseband data decompression device according to claim 7, wherein the I/Q conversion module is further configured to perform I/Q conversion on the quantized amplitude signal and the quantized phase signal of the RS to obtain a complex RS, wherein the complex RS is a complex signal formed by I/Q components. ### Claim 10 (depends on 9) The baseband data decompression device according to claim 9, wherein the channel estimation module is configured to perform channel estimation on the complex RS to obtain an estimated signal. ### Claim 11 (depends on 8) The baseband data decompression device according to claim 8, further comprising: a channel equalization module, configured to perform, by using the estimated signal, channel equalization on the PUSCH signal that undergoes the DFT, to obtain a channel equalized PUSCH signal. ### Claim 12 (depends on 9) The baseband data decompression device according to claim 9, wherein the second transform module is configured to perform IDFT on the channel equalized PUSCH signal to obtain a time-domain PUSCH signal. ### Claim 13 (depends on 6) The baseband data decompression device according to claim 6, further comprising: a coordinate inverse translation module, configured to reset an origin of coordinates according to a constellation quadrant where the complex PUSCH signal is located. ### Claim 14 An uplink baseband signal compression method, comprising: obtaining a physical uplink shared channel (PUSCH) signal according to an uplink time-domain baseband signal of a user; wherein the obtaining a physical uplink shared channel PUSCH signal according to an uplink time-domain baseband signal of a user comprises: obtaining an uplink time-domain baseband signal of a user, removing a cyclic prefix (CP) of the uplink time-domain baseband signal of the user to obtain a CP-removed uplink time-domain baseband signal, performing fast Fourier transform (FFT) on the CP-removed uplink time-domain baseband signal to transform the CP-removed uplink time-domain baseband signal into an uplink frequency-domain baseband signal, and performing resource block demapping on the uplink frequency-domain baseband signal to separate a PUSCH signal from the uplink frequency-domain baseband signal; performing inverse discrete Fourier transform (IDFT) on the PUSCH signal to obtain a time-domain PUSCH signal; performing amplitude/phase conversion on the time-domain PUSCH signal to obtain an amplitude signal and a phase signal of the time-domain PUSCH signal; performing amplitude quantization and phase quantization on the amplitude signal and the phase signal of the time-domain PUSCH signal respectively to obtain a quantized amplitude signal and a quantized phase signal of the time-domain PUSCH signal; performing resource block demapping on the uplink frequency-domain baseband signal to separate a reference signal (RS) from the uplink frequency-domain baseband signal; performing amplitude/phase conversion on the RS to obtain an amplitude signal and a phase signal of the RS; and performing amplitude quantization and phase quantization on the amplitude signal and the phase signal of the RS respectively to obtain a quantized amplitude signal and a quantized phase signal of the RS. ### Claim 15 (depends on 14) The method according to claim 14, further comprising: transmitting the quantized amplitude signal and the quantized phase signal of the time-domain PUSCH signal. ### Claim 16 (depends on 14) The method according to claim 14, further comprising: transmitting the quantized amplitude signal and the quantized phase signal of the RS. ### Claim 17 (depends on 14) The method according to claim 14, further comprising: performing channel estimation on the RS to obtain an estimated channel of the RS; and performing MIMO detection on the PUSCH signal according to the estimated channel of the RS to obtain a MIMO-detected PUSCH signal; wherein the performing inverse discrete Fourier transform IDFT on the PUSCH signal to obtain a time-domain PUSCH signal comprises: performing IDFT on the MIMO-detected PUSCH signal to obtain a time-domain PUSCH signal. ### Claim 18 An uplink baseband signal compression method, comprising: obtaining a physical uplink shared channel (PUSCH) signal according to an uplink time-domain baseband signal of a user; performing inverse discrete Fourier transform (IDFT) on the PUSCH signal to obtain a time-domain PUSCH signal; performing amplitude/phase conversion on the time-domain PUSCH signal to obtain an amplitude signal and a phase signal of the time-domain PUSCH signal; performing amplitude quantization and phase quantization on the amplitude signal and the phase signal of the time-domain PUSCH signal respectively to obtain a quantized amplitude signal and a quantized phase signal of the time-domain PUSCH signal; and translating, according to a constellation quadrant where the time-domain PUSCH signal is located, an origin of coordinates to a preset position in the constellation quadrant where the time-domain PUSCH signal is located, and obtaining coordinates of the time-domain PUSCH signal after the origin of coordinates is translated; wherein the performing amplitude/phase conversion on the time-domain PUSCH signal to obtain an amplitude signal and a phase signal of the time-domain PUSCH signal comprises: performing amplitude/phase conversion on the time-domain PUSCH signal according to the coordinates of the time-domain PUSCH signal, wherein the coordinates of the time-domain PUSCH signal are obtained after the origin of coordinates is translated, to obtain an amplitude signal and a phase signal of the time-domain PUSCH signal. ### Claim 19 An uplink baseband signal decompression method, comprising: obtaining a quantized amplitude signal and a quantized phase signal of a time-domain PUSCH signal; performing I/Q conversion on the quantized amplitude signal and the quantized phase signal of the time-domain PUSCH signal to obtain a complex PUSCH signal, wherein the complex PUSCH signal is a complex signal formed by I/Q components; performing discrete Fourier transform (DFT) on the complex PUSCH signal to map the complex PUSCH signal to a frequency domain; performing inverse discrete Fourier transform (IDFT) on the PUSCH signal that undergoes the DFT, to obtain a time-domain PUSCH signal; performing constellation demodulation on the time-domain PUSCH signal to obtain demodulated data; and decoding the demodulated data to obtain uplink data of a user. ### Claim 20 (depends on 19) The method according to claim 19, further comprising: obtaining a quantized amplitude signal and a quantized phase signal of an RS; performing channel estimation on the quantized amplitude signal and the quantized phase signal of the RS to obtain an estimated signal; and performing, by using the estimated signal, channel equalization on the PUSCH signal that undergoes the DFT, to obtain a channel equalized PUSCH signal. ### Claim 21 (depends on 20) The method according to claim 20, wherein the performing IDFT on the PUSCH signal that undergoes the DFT, to obtain a time-domain PUSCH signal comprises: performing IDFT on the channel equalized PUSCH signal to obtain a time-domain PUSCH signal. ### Claim 22 (depends on 20) The method according to claim 20, further comprising: performing I/Q conversion on the quantized amplitude signal and the quantized phase signal of the RS to obtain a complex RS, wherein the complex RS is a complex signal formed by I/Q components; wherein the performing channel estimation on the quantized amplitude signal and the quantized phase signal of the RS to obtain an estimated signal comprises: performing channel estimation on the complex RS to obtain an estimated signal. ### Claim 23 (depends on 19) The method according to claim 19, further comprising: resetting an origin of coordinates according to a constellation quadrant where the complex PUSCH signal is located.