WO2017045849A1 - Estimation de snir robuste - Google Patents

Estimation de snir robuste Download PDF

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Publication number
WO2017045849A1
WO2017045849A1 PCT/EP2016/069373 EP2016069373W WO2017045849A1 WO 2017045849 A1 WO2017045849 A1 WO 2017045849A1 EP 2016069373 W EP2016069373 W EP 2016069373W WO 2017045849 A1 WO2017045849 A1 WO 2017045849A1
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Prior art keywords
signal
pilot
subcarriers
signals
synchronization
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PCT/EP2016/069373
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English (en)
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Zhibin Yu
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Intel IP Corporation
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals

Definitions

  • the subject matter disclosed herein relates generally to techniques to estimate signal-to-noise- plus-interference ratio (SNIR) in communication channels,
  • SNIR is an important parameter for a mobile communication standard, such as 3 rd Generation Partnership Project (3 GPP) Long Term Evolution (LTE), downlink reception quality on the User Equipment (UE) receiver side of a mobile transmission path.
  • 3 GPP 3 rd Generation Partnership Project
  • LTE Long Term Evolution
  • UE User Equipment
  • the SNIR can be estimated from serving cells as well as neighboring cells.
  • An accurate SNIR estimation of the service cell ensures a reliable radio link monitoring and Chanel Quality Information (CQI) measurement sequence performance. Otherwise, an accurate SNIR estimation of neighboring cells ensures a good neighboring cell identification and good hando- ver/reselection performance.
  • CRS Cell Specific Reference Signals
  • a conventional approach consists in designing more advanced filters such as a Wiener filter with frequency offset correction and adaptive delay spread estimation.
  • filters such as a Wiener filter with frequency offset correction and adaptive delay spread estimation.
  • Another conventional approach included the averaging of the SNIR estimation over a longer time in order to overcome the problem of having a small number of reference subcarriers in the frequency grid.
  • this approach requires longer RF power-on time, and is therefore not power-efficient.
  • Fig. 1 shows the location of reference symbols within a resource block for a one antenna system
  • Fig. 2 shows the structure of a radio frame and slot and the location of synchronization signals
  • Fig. 3 shows the location of the synchronization signals with in a subframe
  • Fig. 4a, 4b show schematic representations of coherent offset scalar products of CRS signals and SSSs, respectively;
  • Fig. 5 shows an example of a method for SNIR estimation
  • Fig. 6 shows another example of a method for SNIR estimation
  • Fig. 7 shows a schematic representation of an apparatus according to an aspect of the present disclosure
  • Fig. 8 shows a schematic example of buffering time domain IQ samples
  • Fig. 9 illustrates an example of a mobile communication device, such as a mobile handset, in accordance with the present disclosure.
  • Fig. 12 illustrates an example of a wireless communication network in accordance with the present disclosure.
  • SNIR can be estimated from a channel of a serving cell as well as from a channel of one or several neighboring cells to determine downlink reception quality on the receiver side of a mobile transmission path.
  • SNIR can be estimated by using pilot signals.
  • pilot signal or pilot symbol is a signal, usually at a single frequency, transmitted over a communications system for supervisory, control, equalization, continuity, synchronization, or reference purposes.
  • a pilot signal In order to be usable as a reference point for the channel downlink power, a pilot signal usually has known signal strength. The pilot signal usually spans the entire bandwidth of the downlink channel.
  • pilot signals are transmitted together with signals containing normal calls, SMS, Emails etc.
  • the pilot signals are transmitted in the input signal from the base station (BS) to the receiver.
  • BS base station
  • the input signals may be transmitted with 1, 2 or 4 antennas without being limited to these numbers.
  • pilot signals are transmitted every first and fifth OFDM symbol of each slot of a subframe with a frequency domain spacing of 6 subcarriers (see Fig. 1).
  • pilot signals are inserted in the input signals from each antenna, where the pilot signals of the second antenna can be offset in the frequency domain by three subcarriers with regard to the pilot signals of the first antenna.
  • the pilot signals include CRS signals.
  • a method of estimating a signal-to-noise- plus-interference ratio on a mobile communication channel comprises estimating the SNIR of the channel based on at least one pilot signal and at least one synchronization signal included in an input signal received via the channel by determining the at least one pilot signal by calculating a first offset scalar product and a second offset scalar product of multiple pilot signals on multiple subcarriers of an Orthogonal Frequency Division Multiplex (OFDM) symbol; and determining the at least one synchronization signal by calculating a first offset scalar product and a second offset scalar product of multiple synchronization signals on multiple subcarriers of the OFDM symbol.
  • OFDM Orthogonal Frequency Division Multiplex
  • Synchronization signals in the input signals and their detection are a prerequisite to measuring the pilot signals or (CSR signals) and also for decoding the Master Information Block (MIB) on the Broadcast Channel (BCH). Therefore, the frequency division duplex (FDD) version as well as the time division duplex (TDD) version of LTE broadcast a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS) in the downlink direction.
  • the UE uses the synchronization signals to achieve radio frame, subframe, slot and symbol synchronization in the time domain, to identify the center of the channel bandwidth in the frequency domain, and deduce the Physical layer Cell Identity (PCI).
  • PCI Physical layer Cell Identity
  • the synchronization signals are transmitted twice per 10ms radio frame. While the primary synchronization signal (PSS) is located in the last OFDM symbol of the first and the 11th slot of each radio frame the secondary synchronization signal immediately precedes the PSS in the before to last symbol of the first and the 11th slot of each radio frame as is shown in Fig. 3.
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • the PSS and the SSS occupy the central six resource blocks irrespective of the system channel bandwidth.
  • the synchronization sequences use 62 subcarriers in total with 31 subcarriers mapped on each side of the DC subcarrier. The location of PSS and SSS in a subframe is shown in Fig. 3.
  • a synchronization signal for SNIR estimation in addition to pilot signals provides a better sensitivity of the SNIR estimation. It permits to avoid a longer Radio Frequency (RF) power-on time as it is conventionally used for the SNIR estimation.
  • RF Radio Frequency
  • the pilot signal is a CRS signal.
  • the synchronization signal is a SSS.
  • the SSS is suitable for the estimation of SNIR since it is unique for a cell and has a cell ID associated to it.
  • Such optional signals include the Channel State Information Reference Signal (CSI-RS) used by the UE to estimate the channel and report channel quality information (CQI) to the base station and the Demodulation Reference Signal (DM-RS) signal.
  • CSI-RS Channel State Information Reference Signal
  • DM-RS Demodulation Reference Signal
  • Other downlink reference signals not mentioned here may be suitable as well.
  • these signals are not included in every radio frame or half radio frame and are hence less frequent.
  • the improvement of the SNIR estimation if one of these signals is used only is less than the use of a SSS since these synchronization signals are less frequent.
  • the present disclosure is not limited to the 3 GPP LTE standard, but pilot signals or synchronization signals of other existing or future communication standards or communication technologies can be used as well.
  • estimating the SNIR comprises coherently combining the at least one pilot signal and the at least one synchronization signal comprising a same residual phase.
  • the coherent combination of the at least one pilot signal and the at least one synchronization signal ensures that the phases of the signals are the same so that no or only little extinction between the signals occurs.
  • the coherent combination of the at least one pilot signal and the at least one synchronization signal can be performed by using a pilot signal / synchronization signal coherent combining algorithm.
  • the first offset scalar product of the multiple pilot signals can be computed by calculating the sum of two or more scalar products of respective two pilot signals on different subcarriers of the OFDM symbol comprising the at least one pilot signal.
  • Offset refers to a frequency offset between the signals in the frequency domain, i.e. the scalar product is calculated with signals on different or neighboring subcarriers.
  • the offset scalar product can be described as the complex-conjugate auto-correlation of a pilot signal or synchronization signal with an offset of at least one subcarrier.
  • the following example shows how the SNIR estimation sensitivity is improved when a pilot signal / synchronization signal coherent combining algorithm according to the present method is used if only one Transmission (TX) port is available in the inter-frequency measurement gap and when a Multicast-Broadcast Single Frequency Network (MBSFN) configuration is assumed.
  • TX Transmission
  • MMSFN Multicast-Broadcast Single Frequency Network
  • the SNIR estimation according to the aspect of the present disclosure requires a small computation effort only since no channel estimation and no frequency offset error and timing error estimation is necessary.
  • the SNIR estimation according to the aspect of the present disclosure is still robust against fading channels, frequency offset and timing offset errors. As a result, it may be used for the serving cell and a high number of neighboring cells in real time.
  • a combination of a filtering using e.g. a Wiener filter
  • an equalization in order to get rid of the fading phase rotation and the frequency offset errors, and adding the results together in order to obtain the SNIR can be used.
  • the multiple pilot signals of the first offset scalar product are assigned to a first transmission port.
  • the respective two pilot signals on different subcarriers of the OFDM symbol comprising the at least one pilot signal are neighboring pilot signals of the OFDM symbol.
  • the neighboring pilot signals of a first of the two or more scalar products are each shifted compared to the neighboring pilot signals of a second of the two or more scalar products by one or more subcarriers of the OFDM symbol comprising the pilot signal.
  • the number of pilot subcarriers per reference OFDM signal is 12 or less than 12.
  • a number of 12 pilot subcarriers are related to a most narrow bandwidth condition.
  • the number of the pilot subcarriers per reference OFDM signal can also be higher than 12 depending on the channel bandwidth of the system and without deviating from the spirit of the aspect of the present disclosure.
  • the estimating the SNIR further comprises calculating a second offset scalar product of multiple pilot signals on multiple sub- carriers of the OFDM symbol comprising the at least one pilot signal, wherein the multiple pilot signals of the second offset scalar product are assigned to a second transmission port.
  • the estimating the SNIR according to another aspect of the present disclosure further comprises adding the first offset scalar product and the second offset scalar product.
  • the frequency domain spacing between each of the subcarriers of the multiple pilot signals assigned to the first transmission port and each of the subcarriers of the multiple pilot signals assigned to the second transmission port is 3 + 6 * n subcarriers, where n > 0 and n is integer.
  • the first offset scalar product of the multiple synchronization signals is computed by calculating the sum of two or more scalar products of respective two synchronization signals on different subcarriers of the OFDM symbol comprising the at least one synchronization signal.
  • the multiple synchronization signals of the first offset scalar product are assigned to a first sequence of synchronization signals of the OFDM symbol, and the respective two synchronization signals on different subcarriers of the OFDM symbol comprising the at least one synchronization signal of a first of the two or more scalar products are each shifted compared to the synchronization signals of a second of the two or more scalar products by one or more subcarriers of the OFDM symbol comprising the synchronization signal.
  • the estimating the SNIR further comprises calculating a second offset scalar product of multiple synchronization signals on multiple subcarriers of the OFDM symbol comprising the at least one synchronization signal, the multiple synchronization signals of the second offset scalar product are assigned to a second sequence of synchronization signals of the OFDM symbol.
  • the sequences may have the same frequency domain spacing of subcarriers.
  • the estimating the SNIR further comprises adding the first offset scalar product and the second offset scalar product.
  • the frequency domain spacing between each of the subcarriers of the multiple synchronization signals assigned to the first sequence and each of the subcarriers of the multiple synchronization signals assigned to the second sequence is n* 1 subcarriers, where n > 0 and n is integer.
  • the frequency domain spacing of the subcarriers selected for calculating the offset scalar product of the synchronization signals could be one or a multiple of one since the synchronization signals occupy neighboring subcarriers as indicated above and is visible in Fig. 3.
  • a subcarrier spacing of six subcarriers is suitable due to the fixed sub- carrier spacing of the pilot signals and in order to ensure coherence between the offset scalar products of pilot signals and synchronization signals.
  • the frequency domain spacing between the two different subcarriers or multiple subcarriers is 6 * n subcarriers, where n > 0 and n is integer, for one or both of the pilot signal or the synchronization signal.
  • This domain spacing between the two different subcarriers is suitable for the subcarriers comprising pilot signals as well as subcarriers comprising synchronization signals.
  • the estimating the SNTR comprises dividing the coherently combined at least one pilot signal and at least one synchronization signal through the difference between the total power of the at least one pilot signal and the at least one synchronization signal, and the result of the coherent combination of the at least one pilot signal and the at least one synchronization signal.
  • the SNIR is calculated according to a schematic representation, where SNIR—
  • the SNIR estimation can be calculated as follows.
  • the aspect of the present disclosure or one or several parts thereof may be combined with at least one of the aspects of the present disclosure according to Fig. 6 or Fig. 7 described below.
  • the pilot signals are CRS signals and the synchronization signals are SSSs without being limited to it.
  • the reference subcarriers in the frequency domain can be represented in the following form:
  • the frequency subcarriers for a SSS symbol can be represented in the following form:
  • H ⁇ (k) is the fading channel transfer functional in the kth sub-carrier
  • At is the normalized time offset error
  • ⁇ is the normalized frequency offset error.
  • the Y sequence consists of two partial sequences (PSO and PS1) in an interleaved way.
  • the Offset Scalar Product (OSP) of the CRSs symbol is computed in the following form. It is visible that the impact of the frequency offset error is removed by the OSP and e ⁇ JTl6A ' is a residual constant phase of CRS OSP due to timing offset errors:
  • OSP CRS OSP CRS TXO + OSPJ RS TXI; ⁇ 3 ⁇ 4(n+l)) ;
  • the OSP of the SSS is designed in such a way that the interval of two scalar subcarriers which are included in the scalar product is always 6. This results in 6 OSP subsets of SSS. They are coherently combined in the following form. It can be seen that the impact of frequency offset error is removed by the OSP and e-" 71 6At is a residual constant phase of SSS OSP due to timing offset errors:
  • OSP SSS (OSP0 SSSJPS0 + OSPl_SSS_PS0 + OSP2_SSS_PS0) + (OSP0_SSS_PSl + OSPl_SSS_PSl + OSP2_SSS_PSl);
  • OSP_COH_COMB OSP_CRS + OSP_SSS;
  • FIG. 4a and 4b A graphical example of the coherent scalar computation of the CRS signals and of the SSSs of neighboring sub-channels is shown in Figs. 4a and 4b.
  • Figures 4a and 4b show a range of neighboring sub-channels along the frequency direction (vertical axis). It is important to note that in order to perform a correct coherent scalar computation the distance between the subchannels that are used for a scalar computation must be constant and the direction in which the channels are selected (in Figs. 4a and 4b from top to down or down to top) must be constant as well.
  • the SNIR estimation is calculated according to the following formula:
  • the method includes buffering input signal samples during a time period that is long enough to detect at least 7 OFDM symbols each comprising at least one pilot signal.
  • the buffering time period is at least 5.08 ms long. This time period is determined by the length of 10 slots of each 0.5 ms which include at least one SSS and the length of the SSS symbol of 0.08 ms.
  • the buffering of the input signal samples during that time period ensures at least 7 CRS symbols can be extracted in the worst case of a Multicast Broadcast Single Frequency Network (MBSFN) configuration.
  • MBSFN Multicast Broadcast Single Frequency Network
  • the buffering time period ensures that SSS signals for all neighboring cells with any time offset are fetched.
  • the method further comprises one or more of extracting OFDM symbols comprising pilot signals and synchronization signals from the input signal; applying a Fast Fourier Transformation (FFT) to the extracted OFDM symbols to obtain frequency domain subcarriers; and performing a pseudo-noise descrambling and demodulation of the OFDM symbols comprising pilot and synchronization signals extracted from the input signal.
  • the input signal received via the channel is a signal of a Multicast-Broadcast-Single-Frequency-Network operation. In this situation only a small number of CRS subcarriers is available for the SNIR estimation. In particular, it is possible that the first CRS reference symbol per LTE subframe can be used for SNFR estimation only.
  • the aspect of the present disclosure of SNIR estimation starts with calculating a first OSP of multiple pilot signals on multiple subcarriers of an OFDM pilot symbol assigned to a first transmission port at block 510.
  • the method may include a subsequent calculating of a second OSP of multiple pilot signals on multiple subcarriers of an OFDM pilot symbol assigned to the second transmission port at block 520.
  • the letter act is optional and will be applied only in case of a further transmission port. The act may be repeated again in the case of further transmission ports. The result of the calculating of the second OSP will then be added to the first OSP result. Further optional OSPs related to further transmission ports will be added as well.
  • the method includes calculating a first OSP of multiple synchronization signals on multiple subcarriers of an OFDM synchronization symbol of a first signal sequence at block 430.
  • a 2nd, 3rd, or further OSP of multiple synchronization signals on multiple subcarriers of an OFDM synchronization symbol may be calculated at block 540 if a 2nd, 3rd, or further signal sequence of synchronization signals is included in the SNIR estimation.
  • the OSP of multiple pilot signals and the OSP of the multiple synchronization signals having the same residual phase are coherently combined.
  • the overall power of the pilot signals and synchronization is computed by accumulating the power of all pilot signals on each subcarrier and of all synchronization signals on each subcarrier involved in the SNIR estimation. Noise terms can be included in the calculation as well if appropriate.
  • a further example of estimating SNIR is described in the following with regard to Fig. 6.
  • the example may be combined with the aspect of the present disclosure according to Fig. 5.
  • the following aspect of the present disclosure is in accordance with the aspects of the present disclosure previously mentioned and includes a certain number thereof.
  • this aspect of the present disclosure is not limited to the acts described but may include lesser or more acts in correspondence with the previously mentioned aspects of present disclosure.
  • input signals are received in a UE at block 610.
  • the input signals can be in-phase and quadrature (IQ) input signal samples received from a BS with two transmission ports or antennas over a communication channel.
  • the received input samples are buffered in a buffer of the UE in block 620.
  • the buffering includes IQ input signal samples of a length of 5.08 ms ensuring that at least 7 pilot symbols in the case of a MBSFN configuration of the communication channel can be extracted.
  • the buffering time length of the buffered IQ input signal samples is just an example and longer or shorter buffering intervals are possible as well.
  • the symbols are extracted from the resource blocks of the buffered input signal which include pilot and synchronization signals.
  • a Fast Fourier Transformation (FFT) is performed on the extracted symbols and in block 640 the subcarriers are extracted from the frequency domain transformed samples which comprise pilot and synchronization signals.
  • FFT Fast Fourier Transformation
  • PN Pseudo-Noise
  • a conjugate multiplication and accumulation of the extracted pilot and synchronization signals including calculated offset scalar products of the extracted pilot and synchronization signals is performed and the SNIR estimation is computed in block 680 as mentioned above.
  • an apparatus for estimating a signal-to- noise-plus-interference (SNIR) ratio on a mobile communication channel comprises a UE comprising means for computing the SNIR of the channel, the means configured to compute the SNIR of the channel based on at least one pilot signal and at least one synchronization signal included in an input signal received via the channel, wherein the means for computing the SNIR of the channel is configured to determine the at least one pilot signal by determining a first offset scalar product of multiple pilot signals on multiple subcarriers of an OFDM symbol comprising the at least one pilot signal; and to determine the at least one synchronization signal by determining a first offset scalar product of multiple synchronization signals on multiple subcarriers of an OFDM
  • SNIR signal-to- noise-plus-interference
  • the pilot signal is a CSR signal.
  • the synchronization signal is a secondary synchronization signal (SSS).
  • SSS secondary synchronization signal
  • the means for computing the SNIR of the channel is configured to coherently combine the at least one pilot signal and the at least one synchronization signal by adding the at least one pilot signal and the at least one synchronization signal comprising a same residual phase. Considering signals having the same residual phase ensures a coherent combination without or substantially signal extinction between the signals.
  • the first offset scalar product of the multiple pilot signals is computed by calculating the sum of two or more scalar products of respective two pilot signals on different subcarriers of the OFDM symbol comprising the at least one pilot signal.
  • the respective two pilot signals on different subcarriers of the OFDM symbol comprising the at least one pilot signal are neighboring pilot signals of the OFDM symbol comprising the at least one pilot signal assigned to a first transmission port, and wherein the neighboring pilot signals of a first of the two or more scalar products are each shifted compared to the neighboring pilot signals of a second of the two or more scalar products by one or more subcarriers of the OFDM symbol comprising the pilot signal.
  • the means for computing the SNIR of the channel is configured to calculate a second offset scalar product of multiple pilot signals on multiple subcarriers of the OFDM symbol comprising the at least one pilot signal, wherein the multiple pilot signals of the second offset scalar product are assigned to a second transmission port and wherein the frequency domain spacing between each of the subcarriers of the multiple pilot signals assigned to the first transmission port and each of the subcarriers of the multiple pilot signals assigned to the second transmission port is 3 + 6 * n subcarriers, where n > 0 and n is integer, and comprises adding the first offset scalar product and the second offset scalar product.
  • the first offset scalar product of the multiple synchronization signals is computed by calculating the sum of two or more scalar products of respective two synchronization signals on different subcarriers of the OFDM symbol comprising the at least one synchronization signal.
  • the multiple synchronization signals are assigned to a first sequence of synchronization signals of the OFDM symbol, and the respective two synchronization signals on different subcarriers of the OFDM symbol comprising the at least one synchronization signal of a first of the two or more scalar products are each shifted compared to the synchronization signals of a second of the two or more scalar products by one or more subcarriers of the OFDM symbol comprising the synchronization signal.
  • the means for computing the SNIR of the channel is configured to calculate a second offset scalar product of multiple synchronization signals on multiple subcarriers of the OFDM symbol comprising the at least one synchronization signal, the multiple synchronization signals of the second offset scalar product are assigned to a second sequence of synchronization signals on the OFDM symbol and the frequency domain spacing between each of the subcarriers of the multiple synchronization signals assigned to the first sequence and each of the subcarriers of the multiple synchroniza- tion signals assigned to the second sequence is n* 1 subcarriers, where n > 0 and n is integer, and to add the first offset scalar product and the second offset scalar product .
  • the frequency domain spacing between the two different subcarriers or multiple subcarriers is 6 * n subcarriers, where n > 0 and n is integer.
  • the means for computing the SNIR of the channel is configured to compute the SNIR by dividing the coherently combined at least one pilot signal and at least one synchronization signal through the difference between the total power of the at least one pilot signal and the at least one synchronization signal, and the result of the coherent combination of the at least one pilot signal and the at least one synchronization signal.
  • the number of pilot subcarriers included in the algorithm per reference OFDM symbol is 12 or less than 12.
  • the input signal received via the channel is a signal of a Multicast-Broadcast-Single-Frequency-Network operation of the mobile communication chanel.
  • a system for receiving a mobile communication signal comprises an apparatus for estimating a SNIR ratio on a mobile communication channel, comprising: a UE comprising a SNIR computation module for computing the SNIR of the channel, the SNIR computation module configured to estimate the SNIR of the channel based on at least one pilot signal and at least one synchronization signal received via the channel by determining the at least one pilot signal by calculating a first offset scalar product of multiple pilot signals on multiple subcarriers of an OFDM symbol comprising the at least one pilot signal; and determining the at least one synchronization signal by calculating a first offset scalar product of multiple synchronization signals on multiple subcarriers of an OFDM symbol comprising the at least one synchronization signal; a conjugate multiplication and accumulation module configured to calculate offset scalar products for both the at least one pilot signal and the at least one synchronization signal and coherently accumulate the offset scalar products; and a buffer configured to buffer
  • the pilot signal is a CRS signal.
  • the synchronization signal is a SSS.
  • the system further comprises a total power calculation module configured to compute the overall power of the at least one pilot signal and the at least one synchronization signal by accumulating the power of each of the at least one pilot signal and the at least one synchronization signal taken into account for the computing of the SNIR.
  • the system comprises a tap delay module configured to delay the detection of a subcarrier signal up to 6 taps in order to filter out individual pilot signals and synchronization signals including SSS.
  • the tap delay module may delay the detection in steps of 1 up to 6 taps without being restricted to this number.
  • the system further comprises at least one of a time domain signal symbol extraction module configured to extract symbols comprising the at least one pilot signal and the at least one synchronization signal one by one from the buffered input signal samples; a Fast Fourier Transform (FFT) module configured to FFT transform the extracted symbols to obtain frequency domain subcarriers the at least one pilot signal and the at least one synchronization signal; and a pilot and synchronization signal subcarrier extraction module configured to perform pilot signal / synchronization signal extraction from the frequency domain subcarriers comprising the at least one pilot signal and the at least one synchronization signal.
  • FFT Fast Fourier Transform
  • the system further comprises at least one of a local pseudo noise (PN) sequence generator; and a pseudo noise (PN) descrambling and pilot and synchronization signal demodulation module configured to perform demodulation of the at least one pilot signal and the at least one synchronization signal by conjugate multiplying a local pseudo noise (PN) sequence from the local PN sequence generator with the extracted frequency domain pilot /synchronization signals.
  • PN pseudo noise
  • the input signal received via the channel is a signal of a Multicast-Broadcast-Single-Frequency-Network operation.
  • Figure 7 shows components of an aspect of the present disclosure of a UE in which the above described SNIR estimation can be performed. It can be implemented in either software (e.g. a software-defined-radio) or hardware or a combination thereof.
  • the example is in accordance with the aspects of the present disclosure previously mentioned and includes a certain number thereof. However the example is not limited to the components and functionality described in the example but may include les or more or other components or aspects of the present disclosure in correspondence with the previously mentioned aspects of the present disclosure.
  • the pilot signals are CRS signals and the synchronization signals are SSSs without being limited to it.
  • a SSS signal occurs every 5 ms (every slot) and if the size of the SSS symbol itself is considered, a 5.08 ms buffering time ensures that at least one complete SSS symbol for any neighboring cell with any timing offset is extracted, as schematically shown in fig. 8.
  • the 5.08 ms buffering also ensures to extract at least 7 CRS symbols in the worst case of a multi-broadcast single frequency network (MBSFN) configuration of the transmission path. Furthermore, a 5.08 ms buffering also allows an implementation in an inter-measurement gap where the total time budget is 6 ms.
  • OFDM symbols comprising CRS signals and OFDM symbols comprising SSS signals are extracted one by one in a time domain CRS/SSS symbol extraction module 3 and the extracted symbols are applied to a FFT module 5 to obtain the frequency domain subcarriers.
  • a demodulation process is done in a PN descrambling and CRS/SSS demodulation module 9 by conjugate multiplying a local pseudo noise (PN) sequence from a local PN sequence generator 11 with the frequency domain CRS and SSS signals extracted in the CRS/SSS subcarrier extraction module 7.
  • PN pseudo noise
  • an offset scalar product (OSP) with a subcarrier interval of 6 is calculated for both the SSS and CRS signals and the offset scalar product of one SSS signal and 7 CRS signals is coherently accumulated in a conjugate multiplication and accumulation module 13.
  • a tap delay module 15 is configured to delay the detection of subcarrier signals up to 6 taps in order to filter out individual CRS signals and SSS.
  • the overall power is computed by accumulating the power of each CRS and SSS subcarrier in a total power calculation module 17.
  • the OSP and the overall power in a power summing module are then used in a SNIR computation module 19 for the SNIR computation according to the aspects of the present disclosure, example method or formula shown above.
  • the components of the UE shown in Fig. 7 merely represent an aspect of the present disclosure.
  • Other example UEs may include more or less components than shown in Fig. 6 and with other or varied functionality than the components of Fig. 7 described above.
  • the aspect of the present disclosure is not restricted to the use of CRS and SSS signals and can be used with other pilot signals and synchronization signals in general.
  • FIG. 9 illustrates an example of a mobile communication device 900, such as a mobile phone handset or user entity (UE) for example, configured to implement one or more aspects of the present disclosure provided herein.
  • mobile communication device 900 includes at least one processing unit 902 and memory 904.
  • memory 904 may be volatile (such as RAM, for example), non- olatile (such as ROM, flash memory, etc., for example) or some combination of the two.
  • Memory 904 may be removable and/or non-removable, and may also include, but is not limited to, magnetic storage, optical storage, and the like.
  • Memory 904 may also include the buffer 1 mentioned above.
  • computer readable instructions in the form of software or firmware 906 to implement one or more aspects of the present disclosure provided herein may be stored in memory 904.
  • Memory 904 may also store other computer readable instructions to implement an operating system, an application program, and the like.
  • Computer readable instructions may be loaded in memory 904 for execution by processing unit 902, for example.
  • Other peripherals, such as a power supply 908 (e.g., battery) and a camera 910 may also be present.
  • Processing unit 902 and memory 904 work in coordinated fashion along with a transceiver 912 to wirelessly communicate with other devices by way of a wireless communication signal.
  • a wireless antenna 920 is coupled to transceiver 912.
  • transceiver 912 may use frequency modulation, amplitude modulation, phase modulation, and/or combinations thereof to communicate signals to another wireless device, such as a base station for example.
  • the previously described SNIR estimation techniques are often implemented in processing unit 902 and/or transceiver 912 (possibly in conjunction with memory 904 and software/firmware 906) to facilitate accurate data communication.
  • the SNIR reduction techniques could also be used in other parts of the mobile communication device 900.
  • a control unit 918 is configured to send control signals to transceiver 912.
  • processing unit 902 comprises control unit 918.
  • the mobile communication device 900 may also include a number of interfaces that allow the mobile communication device 900 to exchange information with the external environment. These interfaces may include one or more user interface(s) 922, and one or more device interface(s) 924, among others.
  • user interface 922 may include any number of user inputs 926 that allow a user to input information into the mobile communication device 900, and may also include any number of user outputs 928 that allow a user to receive information from the mobile communication device 900.
  • the user inputs 926 may include an audio input 930 (e.g., a microphone) and/or a tactile input 932 (e.g., push buttons and/or a keyboard).
  • the user outputs 928 may include an audio output 934 (e.g., a speaker), a visual output 936 (e.g., an LCD or LED screen), and/or tactile output 938 (e.g., a vibrating buzzer), among others.
  • Device interface 924 allows a device such as camera 910 to communicate with other electronic devices.
  • Device interface 924 may include, but is not limited to, a modem, a Network Interface Card (NIC), an integrated network interface, a radio frequency transmitter/receiver, an infrared port, a USB connection, or other interfaces for connecting mobile communication device 900 to other mobile communication devices.
  • Device connection(s) 924 may include a wired connection or a wireless connection.
  • Device connection(s) 924 may transmit and/or receive communication media.
  • FIG. 10 illustrates one example of a wireless network 1000 over which a mobile communication device (e.g., mobile communication device 900 in FIG. 9) in accordance with this disclosure may communicate.
  • the wireless network 1000 is divided into a number of cells (e.g., 1002a, 1002b, . . . , 1002d), wherein each cell has one or more base stations (e.g., 1204a, 1204b, . . . , 1204d, respectively).
  • Each base station may be coupled to a carrier's network 1006 (e.g., a packet switched network, or a circuit switched network such as the public switched telephone network (PSTN)) via one or more wirelines 1008.
  • PSTN public switched telephone network
  • a mobile device 1010 may establish communication with the base station within that cell via one or more of frequency channels used for commumcation in that cell.
  • the communication between a mobile handset or other mobile device 1010 and a corresponding base station often proceeds in accordance with an established standard communication protocol, such as LTE, GSM, CDMA or others.
  • an established standard communication protocol such as LTE, GSM, CDMA or others.
  • the base station may establish communication with another external device via the carrier's network 1006, which may then route communication though the phone network.
  • aspects of the present disclosure may be implemented as any or a combination of: one or more microchips or integrated circuits interconnected using a motherboard, hardwired logic, software stored by a memory device and executed by a microprocessor, firmware, an application specific integrated circuit (ASIC), and/or a field programmable gate array (FPGA).
  • logic may include, by way of example, software or hardware and/or combinations of software and hardware.
  • a computer readable medium comprising instructions that when executed on a computer carry out a method of estimating a signal-to-noise-plus-interference (SNIR) ratio on a mobile communication channel in accordance with any of the above described aspects of the present disclosure.
  • SNIR signal-to-noise-plus-interference
  • aspects of the present disclosure may be provided, for example, as a computer program product which may include one or more machine-readable media having stored thereon machine- executable instructions that, when executed by one or more machines such as a computer, network of computers, or other electronic devices, may result in the one or more machines carrying out operations in accordance with aspects of the present disclosure.
  • a machine- readable medium may include, but is not limited to, floppy diskettes, optical disks, CD-ROMs (Compact Disc-Read Only Memories), and magneto-optical disks, ROMs (Read Only Memories), RAMs (Random Access Memories), EPROMs (Erasable Programmable Read Only Memories), EEPROMs (Electrically Erasable Programmable Read Only Memories), magnetic or optical cards, flash memory, or other type of media / machine- readable medium suitable for storing machine- executable instructions.
  • the drawings and the forgoing description gave examples of different aspects of the present disclosure. Although depicted as a number of disparate functional items, those skilled in the art will appreciate that one or more of such elements may well be combined into single functional elements.
  • Example 1 is a method of estimating a signal-to-noise-plus-interference ratio (SNIR) on a mobile communication channel comprising estimating the SNIR of the channel, wherein the estimating is based on at least one pilot signal and at least one synchronization signal included in an input signal received via the channel by determining the at least one pilot signal by calculating a first offset scalar product and a second offset scalar product of multiple pilot signals on multiple subcarriers of an Orthogonal Frequency Division Multiplex (OFDM) symbol; and determining the at least one synchronization signal by calculating a first offset scalar product and a second offset scalar product of multiple synchronization signals on multiple subcarriers of the OFDM symbol.
  • the pilot signal is a Cell Specific Reference (CSR) signal.
  • CSR Cell Specific Reference
  • the subject matter of any one of examples 1-2 can optionally include that the synchronization signal is a Secondary Synchronization Signal (SSS).
  • SSS Secondary Synchronization Signal
  • any one of examples 1-3 can optionally include that estimating the SMR comprises coherently combining the at least one pilot signal and the at least one synchronization signal by adding the at least one pilot signal and the at least one synchronization signal comprising a same residual phase.
  • any one of examples 1-4 can optionally include that the first offset scalar product of the multiple pilot signals is computed by calculating the sum of two or more scalar products of respective two pilot signals on different subcarriers of the OFDM symbol comprising the at least one pilot signal.
  • example 6 the subject matter of example 5 can optionally include that the multiple pilot signals of the first offset scalar product are assigned to a first transmission port, the respective two pilot signals on different subcarriers of the OFDM symbol comprising the at least one CRS signal are neighboring pilot signals of the OFDM symbol comprising the at least one pilot signal, and the neighboring pilot signals of a first of the two or more scalar products are each shifted compared to the neighboring pilot signals of a second of the two or more scalar products by one or more subcarriers of the OFDM symbol comprising the pilot signal.
  • example 7 the subject matter of example 6 can optionally include that estimating the SNIR further comprises calculating a second offset scalar product of multiple pilot signals on multiple subcarriers of the OFDM symbol comprising the at least one CRS signal, wherein the multiple pilot signals of the second offset scalar product are assigned to a second transmission port and wherein the frequency domain spacing between each of the subcarriers of the multiple pilot signals assigned to the first transmission port and each of the subcarriers of the multiple pilot signals assigned to the second transmission port is 3 + 6 * n subcarriers, where n > 0 and n is integer, and comprises adding the first offset scalar product and the second offset scalar product.
  • any one of examples 1-7 can optionally include that the first offset scalar product of the multiple synchronization signals is computed by calculating the sum of two or more scalar products of respective two synchronization signals on different subcarriers of the OFDM symbol comprising the at least one synchronization signal.
  • example 9 the subject matter of example 8 can optionally include that the multiple synchronization signals of the first offset scalar product are assigned to a first sequence of synchronization signals of the OFDM symbol, and the respective two synchronization signals on different subcarriers of the OFDM symbol comprising the at least one synchronization signal of a first of the two or more scalar products are each shifted compared to the synchronization signals of a second of the two or more scalar products by one or more subcarriers of the OFDM symbol comprising the synchronization signal.
  • example 10 the subject matter of example 9 can optionally include that estimating the SNIR further comprises calculating a second offset scalar product of multiple synchronization signals on multiple subcarriers of the OFDM symbol comprising the at least one synchronization signal, the multiple synchronization signals of the second offset scalar product are assigned to a second sequence of synchronization signals of the OFDM symbol and the frequency domain spacing between each of the subcarriers of the multiple synchronization signals assigned to the first sequence and each of the subcarriers of the multiple synchronization signals assigned to the second sequence is n* 1 subcarriers, where n > 0 and n is integer, and comprises adding the first offset scalar product and the second offset scalar product.
  • any one of examples 5 - 10 can optionally include that the frequency domain spacing between the subcarriers is 6 * n subcarriers, where n > 0 and n is integer.
  • the subject matter of any one of examples 4 - 11 can optionally include that estimating the SNIR comprises dividing the coherently combined at least one pilot signal and at least one synchronization signal through the difference between the total power of the at least one pilot signal and the at least one synchronization signal, and the result of the coherent combination of the at least one pilot signal and the at least one synchronization signal.
  • the subject matter of any one of examples 1-12 can optionally include buffering input signal samples during a time period that is long enough to detect at least 7 OFDM symbols each comprising at least one pilot signal.
  • any one of examples 1-13 can optionally include one or more of: extracting OFDM symbols comprising pilot signals and synchronization signals from the input signal; applying a Fast Fourier Transformation (FFT) to the extracted OFDM symbols to obtain frequency domain subcarriers; and performing a pseudo-noise descram- bling and demodulation of the OFDM symbols comprising pilot and synchronization signals extracted from the input signal.
  • FFT Fast Fourier Transformation
  • any one of examples 1-14 can optionally include that the input signal received via the channel is a signal of a Multicast-Broadcast-Single-Frequency- Network operation of the mobile communication channel.
  • Example 16 is an apparatus for estimating a signal-to-noise-plus-interference (SNIR) ratio on a mobile communication channel, comprising: a UE comprising means for computing the SNIR of the channel, the means configured to compute the SNIR of the channel based on at least one pilot signal and at least one synchronization signal included in an input signal received via the channel, wherein the means for computing the SNIR of the channel is configured to determine the at least one pilot signal by determining a first offset scalar product of multiple pilot signals on multiple subcarriers of an OFDM symbol comprising the at least one pilot signal; and determine the at least one synchronization signal by determining a first offset scalar product of multiple synchronization signals on multiple subcarriers of an OFDM symbol comprising the at least one synchronization signal.
  • SNIR signal-to-noise-plus-interference
  • example 17 the subject matter of example 16 can optionally include that the pilot signal is a CSR signal.
  • the subject matter of any one of examples 16-17 can optionally include that the synchronization signal is a Secondary Synchronization Signal (SSS).
  • SSS Secondary Synchronization Signal
  • any one of examples 16-18 can optionally include that the means for computing the SNIR of the channel is configured to coherently combine the at least one pilot signal and the at least one synchronization signal by adding the at least one pilot signal and the at least one synchronization signal comprising a same residual phase.
  • any one of examples 16-19 can optionally include that the first offset scalar product of the multiple pilot signals is computed by calculating the sum of two or more scalar products of respective two pilot signals on different subcarriers of the OFDM symbol comprising the at least one pilot signal.
  • example 21 the subject matter of example 20 can optionally include that the respective two pilot signals on different subcarriers of the OFDM symbol comprising the at least one pilot signal are neighboring pilot signals of the OFDM symbol comprising the at least one pilot signal assigned to a first transmission port, and wherein the neighboring pilot signals of a first of the two or more scalar products are each shifted compared to the neighboring pilot signals of a second of the two or more scalar products by one or more subcarriers of the OFDM symbol comprising the pilot signal.
  • example 22 the subject matter of example 21 can optionally include that the means for computing the SNIR of the channel is configured to calculate a second offset scalar product of multiple pilot signals on multiple subcarriers of the OFDM symbol comprising the at least one pilot signal, wherein the multiple pilot signals of the second offset scalar product are assigned to a second transmission port and wherein the frequency domain spacing between each of the subcarriers of the multiple pilot signals assigned to the first transmission port and each of the subcarriers of the multiple pilot signals assigned to the second transmission port is 3 + 6 * n subcarriers, where n > 0 and n is integer, and comprises adding the first offset scalar product and the second offset scalar product.
  • any one of examples 16 - 22 can optionally include that the first offset scalar product of the multiple synchronization signals is computed by calculating the sum of two or more scalar products of respective two synchronization signals on different subcarriers of the OFDM symbol comprising the at least one synchronization signal.
  • example 24 the subject matter of example 23 can optionally include that the multiple synchronization signals are assigned to a first sequence of synchronization signals of the OFDM symbol, and the respective two synchronization signals on different subcarriers of the OFDM symbol comprising the at least one synchronization signal of a first of the two or more scalar products are each shifted compared to the synchronization signals of a second of the two or more scalar products by one or more subcarriers of the OFDM symbol comprising the synchronization signal.
  • example 25 the subject matter of example 24 can optionally include that the means for computing the SNIR of the channel is configured to calculate a second offset scalar product of multiple synchronization signals on multiple subcarriers of the OFDM symbol comprising the at least one synchronization signal, the multiple synchronization signals of the second offset scalar product are assigned to a second sequence of synchronization signals on the OFDM symbol and the frequency domain spacing between each of the subcarriers of the multiple synchronization signals assigned to the first sequence and each of the subcarriers of the multiple synchronization signals assigned to the second sequence is n* 1 subcarriers, where n > 0 and n is integer, and to add the first offset scalar product and the second offset scalar product.
  • any one of examples 20 - 25 can optionally include that the frequency domain spacing between the subcarriers is 6 * n subcarriers, where n > 0 and n is integer.
  • any one of examples 19 - 26 can optionally include that the means for computing the SNIR of the channel is configured to compute the SNIR by dividing the coherently combined at least one pilot signal and at least one synchronization signal through the difference between the total power of the at least one pilot signal and the at least one synchronization signal, and the result of the coherent combination of the at least one pilot signal and the at least one synchronization signal.
  • any one of examples 16 - 27 can optionally include that the input signal received via the channel is a signal of a Multicast-Broadcast-Single- Frequency-Network operation of the mobile communication channel.
  • Example 29 is a system for receiving a mobile communication signal comprising: an apparatus for estimating a signal-to-noise-plus-interference (SNIR) ratio on a mobile communication channel, comprising: a UE comprising: a SNIR computation module for computing the SNIR of the channel, the SNIR computation module configured to estimate the SNIR of the channel based on at least one pilot signal and at least one synchronization signal included in an input signal received via the channel by determining the at least one pilot signal by calculating a first offset scalar product of multiple pilot signals on multiple subcarriers of an OFDM symbol comprising the at least one pilot signal; and determining the at least one synchronization signal by calculating a first offset scalar product of multiple synchronization signals on multiple subcarriers of an OFDM symbol comprising the at least one synchronization signal; a conjugate multiplication and accumulation module configured to calculate offset scalar products for both the at least one pilot signal and the at least one synchronization signal and to coherently accumulate the offset
  • example 30 the subject matter of example 29 can optionally include that the at least one pilot signal comprises a CSR signal.
  • any one of examples 29 - 30 can optionally include that the at least one synchronization signal comprises a Secondary Synchronization Signal (SSS).
  • SSS Secondary Synchronization Signal
  • any one of examples 29 - 31 can optionally include: a total power calculation module configured to compute the overall power of the at least one pilot signal and the at least one synchronization signal by accumulating the power of each of the at least one pilot signal and the at least one synchronization signal taken into account for the computing of the SNIR.
  • a total power calculation module configured to compute the overall power of the at least one pilot signal and the at least one synchronization signal by accumulating the power of each of the at least one pilot signal and the at least one synchronization signal taken into account for the computing of the SNIR.
  • any one of examples 29 - 32 can optionally include a tap delay module configured to delay the detection of a subcarrier signal up to 6 taps.
  • any one of examples 29 - 33 can optionally include at least on of: a time domain signal symbol extraction module configured to extract symbols comprising the at least one pilot signal and the at least one synchronization signal one by one from the buffered input signal samples; a Fast Fourier Transform (FFT) module configured to FFT transform the extracted symbols to obtain frequency domain subcarriers of the at least one pilot signal and the at least one synchronization signal; and a pilot and synchronization signal subcarrier extraction module configured to perform pilot signal / synchronization signal extraction from the frequency domain subcarriers comprising the at least one pilot signal and the at least one synchronization signal.
  • FFT Fast Fourier Transform
  • example 35 the subject matter of example 34 can optionally include a local pseudo noise (PN) sequence generator; and a pseudo noise (PN) descrambling and pilot and synchronization signal demodulation module configured to perform demodulation of the at least one pilot signal and the at least one synchronization signal by conjugate multiplying a local pseudo noise (PN) sequence from the local PN sequence generator with the extracted frequency domain pilot signal / synchronization signal.
  • PN pseudo noise
  • any one of examples 29 - 35 can optionally include that the input signal received via the channel is a signal of a Multicast-Broadcast-Single- Frequency-Network operation of the mobile communication channel.
  • Example 37 is a computer readable medium comprising instructions that when executed on a computer carry out a method of estimating a signal-to-noise-plus-interference (SNIR) ratio on a mobile communication channel which comprises estimating the SNIR of the channel, wherein the estimating is based on at least one pilot signal and at least one synchronization signal included in an input signal received via the channel by determining the at least one pilot signal by calculating a first offset scalar product of multiple pilot signals on multiple sub- carriers of an OFDM symbol comprising the at least one pilot signal; and determining the at least one synchronization signal by calculating a first offset scalar product of multiple synchronization signals on multiple subcarriers of an OFDM symbol comprising the at least one synchronization signal.
  • SNIR signal-to-noise-plus-interference
  • example 38 the subject matter of example 37 can optionally include instructions that when executed use as the pilot signal a CRS signal.
  • any one of examples 37 - 38 can optionally include further instructions that when executed use as the synchronization signal a SSS.
  • any one of examples 37 - 39 can optionally include further instructions that when executed coherently combine the at least one pilot signal and the at least one synchronization signal by adding the at least one pilot signal and the at least one synchronization signal comprising a same residual phase.
  • any one of examples 37 - 40 can optionally include that the first offset scalar product of the multiple pilot signals is computed by calculating the sum of two or more scalar products of respective two pilot signals on different subcarriers of the OFDM symbol comprising the at least one pilot signal.
  • example 42 the subject matter of example 41 can optionally include that the multiple pilot signals of the first offset scalar product are assigned to a first transmission port, the respective two pilot signals on different subcarriers of the OFDM symbol comprising the at least one pilot signal are neighboring pilot signals of the OFDM symbol comprising the at least one pilot signal, and the neighboring pilot signals of a first of the two or more scalar products are each shifted compared to the neighboring pilot signals of a second of the two or more scalar products by one or more subcarriers of the OFDM symbol comprising the pilot signal.
  • example 43 the subject matter of example 42 can optionally include further instructions that when executed calculate a second offset scalar product of multiple pilot signals on multiple subcarriers of the OFDM symbol comprising the at least one pilot signal, wherein the multiple pilot signals of the second offset scalar product are assigned to a second transmission port and wherein the frequency domain spacing between each of the subcarriers of the multiple pilot signals assigned to the first transmission port and each of the subcarriers of the multiple pilot signals assigned to the second transmission port is 3 + 6 * n subcarriers, where n > 0 and n is integer, and add the first offset scalar product and the second offset scalar product.
  • any one of examples 37 - 44 can optionally include that the first offset scalar product of the multiple synchronization signals is computed by calculating the sum of two or more scalar products of respective two synchronization signals on different subcarriers of the OFDM symbol comprising the at least one synchronization signal.
  • example 45 the subject matter of example 44 can optionally include that the multiple synchronization signals of the first offset scalar product are assigned to a first sequence of synchronization signals of the OFDM symbol, and the respective two synchronization signals on different subcarriers of the OFDM symbol comprising the at least one synchronization signal of a first of the two or more scalar products are each shifted compared to the synchronization signals of a second of the two or more scalar products by one or more subcarriers of the OFDM symbol comprising the synchronization signal.
  • any one of examples 37 - 45 can optionally include further instructions that when executed calculate a second offset scalar product of multiple synchronization signals on multiple subcarriers of the OFDM symbol comprising the at least one synchronization signal, the multiple synchronization signals of the second offset scalar product are assigned to a second sequence of synchronization signals of the OFDM symbol and the frequency domain spacing between each of the subcarriers of the multiple synchronization signals assigned to the first sequence and each of the subcarriers of the multiple synchronization signals assigned to the second sequence is n* 1 subcarriers, where n > 0 and n is integer, and add the first offset scalar product and the second offset scalar product.
  • any one of examples 41 - 46 can optionally include that the frequency domain spacing between the subcarriers signal is 6 * n subcarriers, where n > 0 and n is integer.
  • any one of examples 40 - 47 can optionally include further instructions that when executed divide the coherently combined at least one pilot signal and at least one synchronization signal through the difference between the total power of the at least one pilot signal and the at least one synchronization signal, and the result of the coherent combination of the at least one pilot signal and the at least one synchronization signal.
  • any one of examples 37 - 48 can optionally include further instructions that when executed buffer input signal samples during a time period that is long enough to detect at least 7 OFDM symbols each comprising at least one pilot signal.
  • the subject matter of any one of examples 37 - 49 can optionally include further instructions that when executed perform one or more of: extracting OFDM symbols comprising pilot signals and synchronization signals from the input signal; applying a Fast Fourier Transformation (FFT) to the extracted OFDM symbols to obtain frequency domain subcarriers; and performing a pseudo-noise descrambling and demodulation of the OFDM symbols comprising pilot and synchronization signals extracted from the input signal.
  • FFT Fast Fourier Transformation
  • the subject matter of any one of examples 37 - 50 can optionally include that the input signal received via the channel is a signal of a Multicast-Broadcast-Single- Frequency-Network operation of the mobile communication channel.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé d'estimation d'un rapport signal sur bruit + brouillage (SNIR) sur un canal de communication mobile, qui consiste à estimer le SNIR du canal sur la base d'au moins un signal pilote et d'au moins un signal de synchronisation compris dans un signal d'entrée reçu par l'intermédiaire du canal par détermination dudit signal pilote par calcul d'un premier produit scalaire de décalage et d'un second produit scalaire de décalage de multiples signaux pilotes sur de multiples sous-porteuses d'un symbole de multiplexage par répartition orthogonale de la fréquence (OFDM), et par détermination dudit signal de synchronisation par calcul d'un premier produit scalaire de décalage et d'un second produit scalaire de décalage de multiples signaux de synchronisation sur de multiples sous-porteuses du symbole OFDM.
PCT/EP2016/069373 2015-09-16 2016-08-16 Estimation de snir robuste WO2017045849A1 (fr)

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