DE102015012176A1 - Sustainable SNIR estimate - Google Patents

Abstract

A method for estimating a signal-to-noise and interference ratio (SNIR) on a mobile communication channel comprising 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 over the channel, by determining the at least one pilot signal by calculating a first offset product and a second offset product of multiple pilot signals on multiple subcarriers of an Orthogonal Frequency Division Multiplexing (OFDM) symbol, and the at least one synchronization signal by computing a first offset scalar product and a second offset scalar product of multiple synchronization signals multiple subcarriers of the OFDM symbol.

Description

area

The subject matter disclosed herein generally relates to techniques for estimating the Signal to Noise and Interference Ratio (SNIR) in communication channels.

Related prior art

In mobile communication, SNIR is an important parameter for a mobile communication standard, such as the Third Generation Partnership Project (3GPP) Long Term Evolution (LTE), downlink reception quality on the user equipment (UE) receiver side of a mobile communication standard mobile transmission path. The SNIR can be estimated on the basis of serving cells as well as neighboring cells. An accurate SNIR estimate of the serving cell guarantees reliable radio link monitoring and channel quality information (CQI) -ness-sequence performance. On the other hand, accurate SNIR estimation of neighbor cells guarantees good neighbor cell identification and good handover / reselection performance. In an LTE based system, SNIR estimation is usually based on cell specific reference (CRS) signals at the UE receiver side. However, if the system bandwidth is small, the number of CRS subcarriers is limited. In the N6 case (6 resource blocks, channel bandwidth at 1.4 MHz), there are only 12 CRS subcarriers per reference Orthogonal Frequency Division Multiplexing (OFDM) symbol. In a case where a Multicast Broadcast Single Frequency Network (MBSFN) is configured, only the first CRS reference symbol per LTE subframe can be applied for SNIR estimation. Such a small number of CRS subcarriers entail limited noise-interference reduction enhancement. Thus, the SNIR estimate is not exact, especially if the channel conditions are poor.

To find a solution to this shortcoming, a conventional approach is to design more advanced filters, such as a Wiener filter with frequency offset correction and adaptive delay spread estimation. The application of filters to a neighbor cell SNIR estimate is very costly because the number of neighbor cells is usually quite high and the estimate can not be performed in real time.

Another conventional approach has included forming the mean of the SNIR estimate over an extended period of time to overcome the problem of having a smaller number of reference subcarriers in the frequency grid. However, in certain scenarios, such as discontinuous reception (DRX), this approach requires longer RF uptime and is therefore not power efficient.

Brief description of the drawings

1 shows the position of reference symbols within a resource block for a single-antenna system;

2 shows the structure of a radio frame and a slot and the position of synchronization signals;

3 shows the position of the synchronization signals within a subframe;

4a . 4b show schematic representations of coherent offset scalar products of CRS signals and SSSs, respectively;

5 shows an example of a method for SNIR estimation;

6 shows another example of a method for SNIR estimation;

7 shows a schematic representation of an apparatus according to an aspect of the present disclosure;

8th shows a schematic example of buffer time domain IQ samples;

9 illustrates an example of a mobile communication device, such as a mobile handset, in accordance with the present disclosure;

10 illustrates an example of a wireless communication network in accordance with the present disclosure.

Detailed description

The reference in this specification to "1 aspect of the present disclosure" or "an aspect of the present disclosure" means that a particular feature, structure, or characteristic described in connection with the aspect of the present disclosure is at least one aspect of the present invention This disclosure includes. Therefore, the aspects of the phrase "in one aspect of the present disclosure" or "in one aspect of the present disclosure" throughout the specification do not necessarily all refer to the same aspect of the present disclosure. Moreover, the particular features, structures, or characteristics may be combined in one or more aspects of the present disclosure.

Various aspects of the present disclosure provide an SNIR estimation approach. SNIR may be estimated from a serving cell channel as well as a channel from one or more neighbor cells to determine downlink reception quality at the receiver side of a mobile transmission path.

In the telecommunications as well as OFDM systems, a pilot signal or pilot symbol is a signal typically occurring at a single frequency transmitted through a communication system for monitoring, control, continuity, synchronization or reference purposes. In order to be usable as a reference point for the channel downlink power, a pilot signal usually has a known signal strength. Usually, the pilot signal covers the entire bandwidth of the downlink channel.

According to a mobile communication standard, for example the 3GPP LTE standard, pilot signals are transmitted along with signals containing normal calls, SMS, e-mails, etc. The pilot signals are transmitted in the input signal from the base station (BS) to the receiver. In the case of a "unicast connection", ie if there is only a single receiver, the input signals can be transmitted with 1, 2 or 4 antennas without being limited to this number. According to a mobile communication standard, for example the 3GPP LTE standard, pilot signals at every first and fifth OFDM symbols of each slot of a subframe with a frequency domain spacing of 6 subcarriers (see FIG 1 ) transfer. In the case of two-antenna transmission, pilot signals are introduced into the input signals from each antenna in which the pilot signals of the second antenna in the frequency domain can be offset by three subcarriers with respect to the pilot signals of the first antenna. According to the 3GPP LTE standard, the pilot signals include CRS signals.

According to one aspect of the present disclosure, a method of estimating a signal-to-noise and 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 transmitted through the channel Channel is determined by determining the at least one pilot signal by computing a first offset scalar product and a second offset scalar product of multiple pilot signals on multiple subcarriers of an Orthogonal Frequency Division Multiplexing (OFDM) symbol; and determining at least one synchronization signal by computing a first offset scalar product and a second offset scalar product of multiple synchronization signals on multiple subcarriers of the OFDM symbol.

Synchronization signals in the input signals and their detection are a prerequisite for measuring the pilot signals (or the CSR signals) and also for decoding the master information block (MIB) on the broadcast channel (BCH). Therefore, both the frequency division duplex (FDD) version and the time division duplex (TDD) version of LTE transmit a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) in the downlink direction. The DE applies the synchronization signals to achieve time domain radio frame, subframe, slot and symbol synchronization to identify the center of the bandwidth in the frequency domain and derive the Physical Layer Cell Identity (PCI).

According to a mobile communication standard, for example the 3GPP LTE standard, the synchronization signals are transmitted twice per 10 ms radio frames. While the primary sync signal (PSS) is located in the last OFDM symbol of the first and 11th slots of each radio frame, the secondary sync signal goes to the PSS in the sequence beginning to last symbol of the first and 11th slots of each radio frame in 3 is shown, immediately ahead. The PSS and the SSS occupy the middle six resource blocks in the frequency domain, regardless of the system channel bandwidth. The synchronization sequence applies a total of 62 subcarriers with 31 subcarriers mapped on each side of the DC subcarrier. The position of PSS and SSS in a subframe is in 3 shown.

The application of a synchronization signal for SNIR estimation in addition to pilot signals provides better sensitivity of the SNIR estimate. A longer radio frequency (RF) operating time, as usually used for SNIR estimation, is thereby prevented.

In one aspect of the present disclosure, the pilot signal is a CRS signal.

According to another aspect of the present disclosure, the synchronization signal is an SSS. The SSS is suitable for estimating SNIR because it is unique to a cell and has a cell ID associated with it.

However, other synchronization signals may also be employed alongside the SSS or alternatively to the SNIR estimate without departing from the aspect of the present disclosure.

Such optional signals include the channel state information reference signal (CSI-RS) applied by the UE to estimate the channel and report base station channel quality information (CQI) and the demodulation reference signal (DM-RS). Other downlink reference signals not mentioned herein may also be suitable. However, compared to the SSS, these signals are not included in every radio frame or half radio frame, and are therefore less common. Thus, the improvement of the SNIR estimate when only one of these signals is applied is less than when SSS is applied because these synchronization signals are less frequent.

However, the present disclosure is not based on the 3GPP Limited LTE standard but pilot signals or synchronization signals of other existing or future communication standards or communication technologies may also be used.

According to another aspect of the present disclosure, estimating the SNIR comprises coherently combining the at least one pilot signal and the at least one synchronization signal that comprise 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 a small extinction between the signals occurs. The coherent combination of the at least one pilot signal and the at least one synchronization signal may be performed by using a pilot signal / synchronization signal coherent combining algorithm.

In a schematic representation, the coherent combining of a CRS signal and an SSS is computed according to OSP_COH_COMB = OSP_CRS + OSP_SSS, wherein the residual phase of the OSPs of CRS signals and SSSs are the same. A schematic example of the calculation of the OSP of the CRS signals and SSSs is given in FIG 4a and 4b shown.

According to another aspect of the present disclosure, the first offset scalar product of the multiple pilot signal may be calculated by calculating the sum of the two or more scalar products of corresponding 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 d. H. the scalar product is calculated with signals on different or adjacent subcarriers. In other words, the offset scalar product may be described as the complex conjugate auto-correlation of a pilot signal or synchronization signal with an offset of at least one subcarrier. In a symbolic description, the offset scalar product of a CRS symbol is calculated according to OSP_CRS = OSP_CRS_TXO + OSP_CRS_TX1 for a first and a second transmission port TXO and TX1, respectively.

The application of an offset scalar product in combination with a pilot signal / synchronization signal coherent combining algorithm has proven to be a sustainable means against timing skew and frequency offset errors. The SNIR estimation sensitivity can therefore be improved compared to an SNIR estimation algorithm based solely on pilot signals. Such an algorithm as currently proposed may be used for SNIR estimation of serving cells as well as neighboring cells.

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 applied when there is only one transmission (TX) port in the inter-frequency measurement gap, and when a multicast Broadcast Single Frequency Network (MBSFN) configuration is assumed. In this case, the guaranteed number of reference subcarriers of a neighboring cell is 12 x 4 + 12 + 12 + 12 = 84 subcarriers when only CRS signals are considered. According to the example, using a pilot signal / synchronization signal coherent combining algorithm, the number of applicable reference subcarriers is extended to 12 * 4 + 12 + 12 + 12 + 62 = 146 subcarriers. Thus, 62 additional subcarriers due to SSS can be used for SNIR estimation in addition to the number of 84 CRS signal subcarriers. Due to the proposed coherent combination scheme, a filter gain improvement of 10 · log 10 (146/84 dB = 2.4 dB can be achieved in theory.

The SNIR estimation according to the aspect of the present disclosure requires little billing because only channel estimation and frequency offset error and timing error estimation are not required. However, the SNIR estimation according to the aspect of the present disclosure is still sustainable against fading channels, frequency offset and timing offset errors. An application for the serving cell and a high number of neighboring cells in real time can therefore be considered. Alternatively, instead of the offset scalar product, a filter combination (e.g., the application of a Wiener filter) may be included as part of a channel estimate, an equation to eliminate the fading phase rotation and frequency offset errors, and adding the results to the SNIR obtained, be applied.

According to one aspect of the present disclosure, the multiple pilot signals of the first offset scalar product are associated with the first transmission port.

Further, according to another aspect of the present disclosure, the respective two pilot signals on different subcarriers of the OFDM symbol comprising the at least one pilot signal are adjacent pilot signals of the OFDM symbol.

In accordance with yet another aspect of the present disclosure, the adjacent pilot signals of a first of the two or more scalar products, as compared to the adjacent pilot signals of a second of the two or more scalar products, are respectively represented by one or more subcarriers of the OFDM symbol comprising the pilot signal postponed.

According to another aspect of the present disclosure, the number of pilot subcarriers per reference OFDM signal 12 or less than 12. A number of 12 pilot subcarriers refer to an extremely narrow bandwidth condition. However, the number of pilot subcarriers per reference OFDM signal may also be greater than 12, depending on the channel bandwidth of the system, and without departing from the scope of the aspect of the present disclosure.

According to yet another aspect of the present disclosure, estimating the SNIR further comprises computing 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 associated with a second transmission port.

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.

In another aspect of the present disclosure, the frequency domain spacing between each of the subcarriers of the multiple pilot signals associated with the first transmission port and each of the subcarriers of the multiple pilot signals associated with the second transmission port is 3 + 6n subcarriers, where n≥ 0 and n is an integer.

In accordance with yet another aspect of the present disclosure, the first offset scalar product of the multiple synchronization signals is calculated by calculating the sum of two or more scalar products of corresponding two synchronization signals on different subcarriers of the OFDM symbol comprising the at least one synchronization signal.

In accordance with yet another aspect of the present disclosure, the multiple synchronization signals of the first offset scalar product are associated with a first sequence of synchronization signals of the OFDM symbol, and the corresponding two synchronization symbols on different subcarriers of the OFDM symbol containing the at least one synchronization signal of a first one of the two or more comprises multiple scalar products, are shifted by one or more subcarriers of the OFDM symbol comprising the synchronization signal, respectively, as compared to the synchronization signals of a second of the two or more scalar products.

According to yet another aspect of the present disclosure, 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, wherein the multiple synchronization signals of the second offset scalar product of a second sequence of synchronization signals of the OFDM symbols are assigned.

The sequences may have the same frequency domain spacing of subcarriers.

According to another aspect of the present disclosure, estimating the SNIR further comprises adding the first offset scalar product and the second offset scalar product.

In a schematic description, the offset scalar product of the synchronization signals (SSS) is computed according to OSP_SSS = (OSP0_SSS_PS0 + OSP1_SSS_PS0 + OSP2_SSS_PS0) + (OSP0_SSS_PS1 + OSP1_SSS_PS1 + OSP2_SSS_PS1), where PS0 and PS1 are two interleaved subsequences of a frequency subcarrier sequence, and OSP0, OSP1, and OSP2 scalar products according to different sequences.

According to another aspect of the present disclosure, the frequency domain spacing between each of the subcarriers of the multiple synchronization signals associated with the first sequence and each of the subcarriers of the multiple synchronization signals associated with the second sequence is n x 1 subcarriers, where n> 0 and n is an integer.

The frequency domain spacing of the subcarriers selected to calculate the offset scalar product of the synchronization signals could be one or a multiple of one because the synchronization signals occupy adjacent subcarriers as indicated above and in FIG 3 you can see. For the present purpose of coherently combining the scalar product of the pilot signals and synchronization signals, subcarrier spacing of six subcarriers is suitable due to the fixed subcarrier spacing of the pilot signals and to ensure coherence between the offset scalar products of pilot signals and synchronization signals.

According to one aspect of the present disclosure, the frequency domain spacing between the two different subcarriers or multiple subcarriers is 6 * n subcarriers, where n> 0 and n is an integer, for one or both of the pilot signal and the synchronization signal. This range spacing between the two different subcarriers is suitable for subcarriers comprising pilot signals as well as subcarriers comprising synchronization signals.

According to yet another aspect of the present disclosure, estimating the SNIR comprises dividing the coherently combined at least one pilot signal and the at least one synchronization signal by 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 a pilot signal and the at least one synchronization signal.

According to one aspect of the present disclosure, the SNIR is calculated according to a schematic representation wherein SNIR = | OSP_COH_COMB | / ((total power of reference sub-carriers and of frequency sub-carriers and noise) - | OSP_COH_COMB |).

According to one aspect of the present disclosure, the SNIR estimate may be calculated as follows. The aspect of the present disclosure or one or more parts thereof may be implemented with at least one of the aspects of the present disclosure as described below 6 or 7 be combined. In accordance with the aspect of the present invention, the pilot signals are CRS signals, and the synchronization signals are SSSs, without being limited thereto.

According to the aspect of the present disclosure, after IFFT and CRS demodulation of the input signals, the reference subcarriers may be represented in the frequency range of a transmission terminal for a CRS reference OFDM symbol as follows: X ₀ (n) = H ₁ (s + 6n) · e ^{jπ ((s-6n) Δt + Δf)} , = 0, 1, L, 2 N _R where H ₁ (s + 6n) is the fading channel transfer function in the nth CRS subcarrier, s is the initial subcarrier offset for the first reference subcarrier depending on the cell ID, Δt is the normalized skew error, and Δf is the normalized frequency offset error.

In the case of a presence of a second transmission port, the reference subcarriers may be represented in the frequency domain in the following form: X _b (n) = H ₁ (s + 6n-3) · e ^{jπ ((s-6n-3) ΔtΔf)} , n = 0, 1, L, 2N _RB

After IFFT and SSS demodulation, the frequency subcarriers for an SSS symbol can be represented in the following form: Y (k) = H ₂ (k) · e ^{jπ (k · Δt + Δf)} , k = 0, 1, L, 61 where H ₁ (k) is the fading channel transfer function in the kth subcarrier, Δt is the normalized skew error, and Δf is the normalized offset frequency error. The Y sequence consists of two subsequences (PS0 and PS1) in a nested fashion. The offset scalar product (OSP) of the CRSs symbol is calculated in the following form. It can be seen that the relevance of the frequency offset ^error is removed by the OSP, and e ^{-jπ6Δt is} a constant residual phase of CRS-OSP due to timing offset errors:

To apply coherent combining with CRS, the OSP of the SSS is designed in such a way that the interval of two scalar subcarriers contained in the dot product is always 6. This yields 6 OSP sub-sets of SSS. These are combined coherently in the following form. It can be seen that the relevance of a frequency offset ^error is eliminated by the OSP, and e ^{-jπ6Δt is} a constant residual phase of SSS-OSP due to timing offset errors:

Since the residual phase of the OSP is the same by CRS signals and SSSs, coherent combining of CRS and SSS is possible in the following form: OSP_COH_COMB = OSP_CRS + OSP_SSS;

A graphic example of the coherent scalar computation of the CRS signals and the SSSs of the adjacent subchannels is in FIG 4a and 4b shown. 4a and 4b show a range of adjacent sub-channels along the frequency direction (vertical axis). It should be noted that in order to perform a correct coherent scalar calculation, the distance between the sub-channels used for a scalar calculation must be constant, and the direction in which the channels are selected (in 4a and 4b from top to bottom or from bottom to top) must also be constant.

The SNIR estimate is calculated according to the following formula:

According to one aspect of the present disclosure, the method includes buffer input signal samples for a time period long enough to detect at least 7 OFDM symbols, each comprising at least one pilot signal. According to an example related to the LTE standard, the buffer time period is at least 5.08 ms long. This time period is determined by the length of 10 slots of 0.5 ms each, comprising at least one SSS, and the length of the SSS symbol of 0.08 ms. Buffering the input signal samples during this time period ensures that at least 7 CRS symbols can be extracted in the worst case of a multicast Broadcast Single Frequency Network (MBSFN) configuration. Moreover, the buffer time period ensures that SSS signals are fetched for all neighbor cells at arbitrary time offset.

According to another aspect of the present disclosure, the method further comprises one or more extracting OFDM symbols comprising pilot signals and synchronization signals from the input signal; applying a Fast Fourier Transform (FFT) to the extracted OFDM symbols to obtain frequency domain subcarriers; and performing pseudo-noise decoding and demodulation of the OFDM symbols comprising pilot and synchronization signals extracted from the input signal.

According to another aspect of the present disclosure, the input signal received over the channel is a multicast broadcast single frequency network operation signal. In this situation, only a small number of CRS subcarriers are available for SNIR estimation. In particular, it is possible that the first CRS reference symbol per LTE subframe can only be used for an SNIR estimate.

One aspect of the present disclosure of the SNIR estimate will be discussed with reference to FIG 5 described. The aspect of the present disclosure is in accordance with the aforementioned aspects of the present disclosure and includes a certain number of these aspects of the present disclosure. However, the aspect of the present disclosure is not limited to what is presented by description, but may offer less or more, according to the aforementioned aspects of the present disclosure. 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 that is a first transmission port at block 510 assigned. In the case of a second transmission port involved in the signal transmission of an input signal to the receiving UE, the method may comprise subsequently calculating a second OSP of multiple pilot signals on multiple subcarriers of an OFDM pilot symbol which is the second transmission block at block 520 assigned. However, the latter functional process is optional and only applies in the case of a further transmission connection. The functional process can be repeated again in the case of further transmission connections. The calculation result of the second OSP is then added to the second OSP result. Other optional OSPs related to additional transfer ports will also be added.

In parallel, the method includes computing at block a first OSP of multiple synchronization signals on multiple subcarriers of an OFDM symbol of a first signal sequence 430 , As an option, a second, third, or further OSP of multiple sync signals on multiple subcarriers of an OFDM sync symbol at block 540 calculated when a second, third or further signal sequence of synchronization signals from the SNIR estimate is included. These results are then added to the first OSP of multiple synchronization signals.

At block 560 For example, the OSP of multiple pilot signals and the OSP of the multiple synchronization signals having the same residual phase are combined coherently. In block 550 The total power of the pilot signals and the synchronization signals is calculated by accumulating the power of all the pilot signals on each subcarrier and all the synchronization signals on each subcarrier involved in the SNIR estimation. Noise levels may also be included in the calculation if necessary.

In block 570 the SNIR is computed according to SNIR = | OSP_OCR_COMB | / ((total power of reference subcarriers and frequency subcarriers and noise) - | OSP_COH_COMB |) as detailed above.

According to another aspect of the present disclosure, another example of estimating SNIR will be described below with reference to FIG 6 described.

The example may be in accordance with the aspect of the present disclosure 5 be combined. The following aspect of the present disclosure is in accordance with the foregoing aspects of the present disclosure and includes a certain number thereof. However, this aspect of the present disclosure is not limited to the described performance processes, but may include fewer or more performance operations in accordance with the aforementioned aspects of the present disclosure.

According to the aspect of the present disclosure of estimating SNIR with reference to FIG 6 become input signals in a UE at block 610 receive. The input signals may be in-phase and quadrature (IQ) calibration signal samples received from a BS having two communication ports or antennas over a communication channel. The received input samples be in a buffer of the UE in block 620 buffered. Buffering comprises 5.08 ms length of IQ input signal samples, which ensures that at least 7 pilot symbols can be extracted in the case of MBSFN configuration of the communication channel. However, the buffer time length of the buffered IQ input signal samples is just one example, and longer or shorter buffer intervals are also possible. As a result, the symbols in block 630 extracted from the resource blocks of the buffered input signal comprising pilot and synchronization signals. In block 640 a Fast Fourier Transform (FFT) is performed on the extracted symbols, and in Block 640 the sub-carriers are extracted from the frequency-converted samples comprising pilot and synchronization signals. Then, pseudo noise (PN) decryption and pilot and sync signal demodulation are performed using a locally generated PN sequence in block 660 executed. Next, conjugate multiplication and accumulation of the extracted pilot and synchronization signals comprising calculated offset scalar products of the extracted pilot and synchronization signals is performed, and the SNIR estimate is determined in block 680 , as mentioned above, calculated. The number of pilot and synchronization signals depends on the number of transmission ports involved. The details of the calculation of the conjugate multiplication and accumulation of the extracted pilot and synchronization signals and the offset scalar products of the pilot and synchronization signals are described above.

According to another aspect of the present invention, there is provided an apparatus for estimating a signal-to-noise and interference (SNIR) ratio on a mobile communication channel comprising a UE comprising means for computing the SNIR of the channel Means is configured to calculate the SNIR of the channel based on at least one pilot signal and at least one synchronization signal included in an input signal received over the channel, wherein the means for calculating the SNIR of the channel is configured determining 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.

According to one aspect of the present disclosure, the pilot signal is a CSR signal.

According to another aspect of the present disclosure, the synchronization signal is a secondary synchronization signal (SSS).

According to yet another aspect of the present disclosure, the means for calculating the SNIR of the channel is configured to coherently combine the at least one pilot signal and the at least one synchronization signal by including the at least one pilot signal and the at least one synchronization signal having a same residual phase; be added. Considering signals having the same residual phase ensures a coherent combination without substantial extinction between the signals.

According to another aspect of the present disclosure, the first offset scalar product of the multiple pilot signals is calculated by calculating the sum of two or more scalar products of corresponding two pilot signals on different subcarriers of the OFDM symbol comprising the at least one pilot signal.

According to one aspect of the present disclosure, the respective two pilot signals on different sub-carriers of the OFDM symbol comprising the at least one pilot signal are adjacent pilot signals of the OFDM symbol comprising the at least one pilot signal associated with a first transmission port and wherein the neighbor pilot signals a first of the two or more scalar products are shifted, as compared to the neighbor 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, respectively.

According to one aspect of the present disclosure, the means for computing the SNIR of the channel is configured to compute 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 correspond to one another associated with the second transmission port, and wherein the frequency domain spacing between each of the subcarriers of the multiple pilot signals associated with a first transmission port and each of the subcarriers of the multiple ones Pilot signals associated with the second transmission port is 3 + 6 * n subcarriers, wherein n ≥ 0 and n is an integer, and comprising adding the first offset scalar product and the second offset scalar product.

In accordance with yet another aspect of the present disclosure, the first offset scalar product of the multiple synchronization signals is calculated by calculating the sum of two or more scalar products of corresponding two synchronization signals on different subcarriers of the OFDM symbol comprising the at least one synchronization signal.

In accordance with yet another aspect of the present disclosure, the multiple synchronization signals are associated with a first sequence of synchronization signals of the OFDM symbol and the corresponding 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 shifted relative 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, respectively.

According to another aspect of the present disclosure, the means for calculating 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, wherein the multiple synchronization signals of the second offset scalar product associated with 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 associated with the first sequence and each of the subcarriers of the multiple synchronization signals associated with the second sequence, n x 1 subcarriers where n> 0 and n is an integer, and to add the first offset scalar product and the second offset scalar product.

According to another aspect of the present disclosure, the frequency domain spacing between the two different subcarriers or multiple subcarriers is 6 * n subcarriers, where n> 0 and n is an integer.

According to another aspect of the present disclosure, the means for calculating the SNIR of the channel is configured to calculate the SNIR by dividing the coherently combined at least one pilot signal and at least one synchronization signal by the difference between the total power of the at least one pilot signal and the at least one synchronization signal and calculate the result of the coherent combination of the at least one pilot signal and the at least one synchronization signal.

According to another aspect of the present disclosure, the number of pilot subcarriers included in the algorithm is per reference OFDM symbol 12 or less than 12.

According to another aspect of the present disclosure, the input signal received over the channel is a signal of a multicast broadcast single frequency network operation of the mobile communication channel.

According to another aspect of the present disclosure, there is provided a system for receiving a mobile communication signal comprising an apparatus for estimating an SNIR ratio on a mobile communication channel, comprising: a UE having an SNIR calculation module for computing the SNIR of the Channel, wherein the SNIR computing module is configured to estimate the SNIR of the channel based on at least one pilot signal and at least one synchronization signal received over the channel by multiplying the at least one pilot signal by calculating a first offset scalar product of multiple pilot signals Subcarriers of an OFDM symbol comprising the at least one pilot signal is determined; and determining the at least one synchronization signal by computing a first offset scalar product of multiple synchronization signals on multiple subcarriers of an OFDM symbol comprising the at least one synchronization signal; wherein a conjugate multiply and accumulate module is 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 scalar products; and wherein a buffer is configured to buffer input signal samples for a period of time long enough to detect at least 7 OFDM symbols each comprising at least one pilot signal. In particular, can the buffer is configured to buffer input signal samples for a period of at least 5.08 ms.

In another aspect of the present disclosure, the pilot signal is a CRS signal.

According to another aspect of the present disclosure, the synchronization signal is an SSS.

According to yet another aspect of the present disclosure, the system further comprises a total power calculation module configured to calculate the total 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 indicative of calculating the SNIR should be considered.

In yet another aspect of the present disclosure, the system includes a tap delay module configured to delay the detection of a subcarrier signal up to 6 taps to filter individual pilot signals and synchronization signals including SSS. However, the tap delay module may delay the detection in increments of 1 to 6 taps without being limited to this number.

In accordance with yet another aspect of the present disclosure, the system further includes at least one of a time domain signal symbol extraction module configured to sequentially extract symbols comprising at least the one pilot signal and the at least one synchronization signal from the buffered input signal samples; from 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 subcarrier extraction module configured to execute a pilot signal / synchronization signal extraction from the frequency domain subcarriers comprising the at least one pilot signal and the at least one synchronization signal.

According to one aspect of the present disclosure, the system further comprises at least one of a local pseudo noise (PN) sequence generator; and wherein a pseudo-noise (PN) decryption and pilot and synchronization signal demodulation modules are configured to demodulate the at least one pilot signal and the at least one synchronization signal by conjugately multiplying a local pseudonoise (PN) sequence from the local PN sequence generator with the extracted frequency range pilot / synchronization signals.

According to another aspect of the present disclosure, the input signal received over the channel is a multicast broadcast single frequency network operation signal.

7 FIG. 12 shows components of an aspect of the present disclosure of a UE in which the SNIR estimate described above may be performed. It can be implemented either in software (for example, a software-defined radio) or hardware or a combination thereof.

The example is in accordance with the aforementioned aspects of the present disclosure and includes a certain number thereof. However, the example is not limited to the components described in the example and their functionality, but may include less or more or other components or aspects of the present disclosure according to the aforementioned aspects of the present disclosure. According to the example, the pilot signals are CRS signals, and the synchronization signals are SSSs, without being limited thereto.

In the example, UE-received-5.08 ms time-domain in-phase and quadrature (IQ) samples are buffered in a buffer 1 of the UE. In an LTE downlink (DL) signal, an SSS signal occurs every 5 ms (each slot), and if the size of the SSS symbol itself is taken into account, a 5.08 ms buffer time guarantees that at least a complete SSS symbol is extracted for any neighbor cell with any timing offset, as in 8th is shown schematically.

The 5.08 ms buffer also guarantees to extract at least 7 CRS symbols in the worst case of a Multicast Broadcast Single Frequency Network (MBSFN) configuration of the transmission path. In addition, 5.08 ms buffering also allows implementation in an intermediate measurement gap where the total time budget is 6 ms. After buffering the IQ samples based on the timing offsets of the IQ samples based on serving cells and neighbor cells, OFDM symbols comprising CRS signals and OFDM symbols comprising SSS signals are extracted in order in a time-domain CRS / SSS symbol extraction module 3, and the extracted symbols be on an FFT module 5 applied to achieve the frequency domain subcarriers. Subsequently, in a CRS / SSS subcarrier extraction module 7, extraction of the CRS and SSS signals from the frequency domain subcarriers is performed. Subsequently, a demodulation process is performed in a PN decryption and CRS / SSS demodulation module 9 by multiplying a local pseudo noise (PN) sequence from a local PN sequence generator 11 performed, wherein the frequency domain CRS and -SSS signals in the CRS / SSS subcarrier extraction module 7 be extracted.

After demodulation, an offset scalar product (OSP) having 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 output in a conjugate multiply and accumulate signal. module 13 coherently accumulated. A tap delay module 15 is configured to delay the detection of the subcarrier signals up to 6 taps to filter out individual CRS signals and SSS. At the same time, overall performance is gained by accumulating the power of each CRS and SSS subcarrier in a total power calculation module 17 calculated. The OSP and the total power in a power summing module will then come in a SNIR calculation module 19 for the SNIR calculation according to the above-mentioned aspects of the present disclosure, the exemplary method or the formula for use.

The components of in 7 UEs shown are merely one aspect of the present disclosure. Other UEs may have more or less components than those in FIG 6 are shown and with a different or varied functionality than those in 7 components described above. In particular, the aspect of the present disclosure is not limited to the application of CRS and SSS signals, and may be generally applied with other pilot signals and synchronization signals.

9 illustrates an example of a mobile communication device 900 A mobile handset or user unit (UE) configured to implement one or more aspects of the present disclosure provided herein. In one configuration, the mobile communication device includes 900 at least one processing unit 902 and memory 904 , Memory may vary depending on the exact configuration and type of mobile communication device 904 be volatile (such as RAM), non-volatile (such as ROM, a flash memory, etc.) or some combination of the two. Storage 904 may be removable and / or non-removable, and may include, but is not limited to, magnetic storage, optical storage, and the like. Storage 904 may also include the above-mentioned buffer 1. In some embodiments, computer-readable instructions may be in the form of software or firmware 906 for implementing one or more aspects of the present disclosure provided herein in memory 904 be saved. Storage 904 may also store other computer-readable instructions to implement an operating system, application program, and the like. Computer readable commands can be stored in memory 904 for execution by, for example, processing unit 902 getting charged. Other peripherals, such as a power supply 908 (for example, battery) and a camera 910 , may also be present.

processing unit 902 and memory 904 work in a coordinated fashion with a transceiver 912 to wirelessly communicate with other devices by means of a wireless communication signal. To enable this wireless communication, a wireless antenna is used 920 with transmitter-receiver 912 coupled. During a wireless communication can transmitter-receiver 912 Apply frequency modulation, amplitude modulation, phase modulation and / or combinations thereof to transmit signals to another wireless device, such as a base station. The SNIR estimation techniques described above are often in processing unit 902 and / or transceiver 912 (possibly related to memory 904 and software / firmware 906 ) to allow accurate data communication. However, the SNIR reduction techniques could also be used in other parts of the mobile communication device 900 come into use.

A control unit 918 is configured to send control signals to the transceiver 912 to send. In some aspects of the present disclosure, processing unit includes 902 control unit 918 ,

To the interaction of a user with the mobile communication device 900 can enhance the mobile communication device 900 Also include a number of interfaces that make it the mobile communication device 900 allow with the external environment information exchange. These interfaces may include, but are not limited to, one or more user interface (s). 922 , and one or more device interfaces 924 include.

If present, the user interface can 922 any number of user inputs 926 include that allow a user information in the mobile communication device 900 and can also have any number of user exits 928 include that allow a user to obtain information from the mobile communication device 900 to recieve. In some example mobile phones, the user inputs 926 an audio input 930 (For example, a microphone) and / or a Tast input 932 (For example, push buttons and / or a keyboard) include. In some example mobile phones, the user exits 928 including an audio output 934 (For example, a speaker), a visual output 936 (For example, an LCD or LED screen) and / or a Tastausgang 938 (for example, a vibration beep).

Device interface 924 allows a device, such as a 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 transceiver, an infrared port, a USB connection, or other interfaces to the mobile communication device 900 to connect with other mobile communication devices. Means compound (s) 924 may include a wired or wireless connection. Means compound (s) 924 can send and / or receive communication media.

10 illustrates an example of a wireless network 1000 via which a mobile communication device (for example, the mobile communication device 900 in 9 ) according to this disclosure. The wireless network 1000 is in a number of cells (for example 1002a . 1002b , ..., 1002d ), wherein each cell has one or more base stations (e.g. 1204a . 1204b , ..., respectively 1204d ) having. Each base station can be connected to an operator network 1006 (For example, a packet-switched network or a circuit-switched network, such as the public switched telephone network (PSTN)) via one or more wire lines 1008 be coupled.

A mobile device 1010 (For example, the mobile communication device 900 ) or another mobile device having a transceiver configured for SNIR estimation may establish communication with the base station within that cell via one or more frequency channels used for communication in that cell. The communication between a mobile handset or other mobile device 1010 and a corresponding base station often runs in accordance with a proven standard communication protocol, such as LTE, GSM, CDMA or others. When a base station establishes communication with a mobile handset or other mobile device, then the base station may communicate with another external device via the operator network 1006 which can then conduct communication through the telephone network.

Aspects of the present disclosure may be implemented as any or a combination of: one or more microchips or integrated circuits that may be implemented by using a motherboard, hard-wired logic, software stored by a memory device, and executed by a microprocessor Firmware, an application-specific integrated circuit (ASIC) and / or a universal circuit (FPGA) are interconnected. The term "logic" may include, for example, software or hardware and / or combinations of software and hardware.

In accordance with one aspect of the present disclosure, a computer-readable medium is provided that includes instructions that, when executed on a computer, include a method of estimating a signal-to-noise and interference (SNIR) ratio on a mobile communication channel according to any one of the aspects described above of the present disclosure.

Aspects of the present disclosure may be provided, for example, as a computer program product that may include one or more machine-readable media having machine-executable instructions stored thereon that when executed by one or more machines, such as a computer, a network of computers, or other electronic devices which may result in one or more machine performance operations in accordance with aspects of the present disclosure.

A machine-readable medium may include floppy disks, optical disks, CD-ROMs (compact disk read-only memory) and magnetic-optical disks, ROMs (read-only memory), RAMs (random-access memory), EPROMs (erasable programmable read-only memory), EEPROMs (Electrically Erasable Programmable Read Only Memory), magnetic or optical cards, flash memory, or other types of media / machine readable medium suitable for storing machine-executable instructions include, but are not limited to. The drawings and the foregoing description have given examples of various aspects of the present disclosure. Although depicted as a number of fundamentally different functional data fields, those skilled in the art will recognize that one or more of such elements may be readily combined to form individual functional elements. Alternatively, certain elements may be divided into multiple functional elements. Elements of one aspect of the present disclosure may be added to another aspect of the present disclosure. However, the scope of the aspects of the present disclosure is by no means limited by these specific examples. Numerous variations, whether expressly stated in the specification or not, such as differences in structure, dimension and use of material, are possible.

Examples

The following examples are related to further aspects of the present disclosure.

Example 1 is a method for estimating a Signal to Noise and Interference Ratio (SNIR) on a mobile communication channel, which comprises estimating the SNIR of the channel, wherein the estimation is based on at least one pilot signal and at least one synchronization signal included in one, receiving the input signal received over the channel by determining the at least one pilot signal by computing a first offset scalar product and a second offset scalar product of multiple pilot signals on multiple subcarriers of an orthogonal frequency division multiplexing (OFDM) symbol; and determining the at least one synchronization signal by computing a first offset scalar product and a second offset scalar product of multiple synchronization signals on multiple subcarriers of the OFDM symbol.

In Example 2, the subject matter of Example 1 may optionally include that the pilot signal is a cell specific reference (CSR) signal.

In Example 3, the subject matter of any one of Examples 1-2 may optionally include that the synchronization signal is a secondary synchronization signal (SSS).

In Example 4, the subject matter of any of Examples 1-3 may optionally include estimating the SNIR comprising coherently combining the at least one pilot signal and the at least one synchronization signal by the at least one pilot signal and the at least one synchronization signal having a same residual phase have to be added.

In Example 5, the subject matter of any of Examples 1-4 may optionally include the first offset scalar product of the multiple pilot signals by calculating the sum of two or more scalar products of corresponding two pilot signals on different subcarriers of the OFDM symbol comprising the at least one pilot signal , is calculated.

In Example 6, the subject matter of Example 5 may optionally include the multiple pilot signals of the first offset scalar product associated with a first transmission port, the corresponding two pilot signals on different subcarriers of the OFDM symbol comprising the at least one CRS signal, neighbor pilot signals of the OFDM Symbol comprising the at least one pilot signal, and the neighbor pilot signals of a first of the two or more scalar products, as compared to the neighbor pilot signals of a second of the two or more dot products by one or more subcarriers of the OFDM symbol comprising the pilot signal , respectively are shifted.

In Example 7, the subject matter of Example 6 may optionally include estimating the SNIR further comprising 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 associated with a second transmission port, and wherein the frequency domain spacing between each of the subcarriers of the multiple pilot signals associated with the first transmission port and each of the subcarriers of the multiple pilot signals, assigned to the second transfer port is 3 + 6 * n subcarriers, where n ≥ 0 and n is an integer, and comprises adding the first offset scalar product and the second offset scalar product.

In Example 8, the subject matter of any of Examples 1-7 may optionally include the first scalar product of the multiple synchronization signals by calculating the sum of two or more scalar products of corresponding two synchronization signals on different subcarriers of the OFDM symbol comprising the at least one synchronization signal , is calculated.

In Example 9, the subject matter of Example 8 may optionally include the multiple synchronization signals of the first offset scalar product associated with a first sequence of synchronization signals of the OFDM symbol and the corresponding two synchronization signals on different subcarriers of the OFDM symbol representing the at least one synchronization signal of one first of the two or more scalar products, as 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, respectively.

In example 10, the subject matter of example 9 may optionally include estimating the SNIR further comprising calculating a second offset scalar product of multiple synchronization signals on multiple subcarriers of the OFDM symbol comprising the at least one synchronization signal, wherein the multiple synchronization signals of the second offset scalar product is associated with 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 associated with the first sequence and each of the subcarriers of the multiple synchronization signals associated with the second sequence is n x 1 subcarriers wherein n> 0 and n is an integer, and comprising adding the first offset scalar product and the second offset scalar product.

In Example 11, the subject matter of any of Examples 5-10 may optionally include the frequency domain spacing between the subcarriers being 6 * n subcarriers, where n> 0 and n is an integer.

In Example 12, the subject matter of any of Examples 4-11 may optionally include estimating the SNIR dividing the coherently combined at least one pilot signal and at least one synchronization signal by the difference between the total power of the at least one pilot signal and the at least one synchronization signal; the result of the coherent combination of the at least one pilot signal and the at least one synchronization signal.

In Example 13, the subject matter of any one of Examples 1-12 may optionally include buffering input signal samples for a time period long enough to detect at least 7 OFDM symbols, each comprising at least one pilot signal.

In Example 14, the subject matter of any of Examples 1-13 may optionally include one or more of: extracting OFDM symbols comprising pilot signals and synchronization signals from the input signal; Applying a Fast Fourier Transform (FFT) to the extracted OFDM symbols to obtain frequency domain subcarriers; and performing pseudo-noise decoding and demodulation of the OFDM symbols comprising pilot and synchronization signals extracted from the input signal.

In Example 15, the subject matter of any one of Examples 1-14 may optionally include the input signal received over the channel being 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 and interference (SNIR) ratio on a mobile communication channel, comprising: UE-comprehensive means for computing the SNIR of the channel, the means being configured to SNIR the channel based on at least one pilot signal and at least one synchronization signal contained in an input signal received over the channel, wherein the means for calculating the SNIR of the channel is configured to generate the at least one pilot signal by determining a first offset scalar product of multiple pilot signals in multiple Subcarriers of an OFDM symbol comprising the at least one pilot signal; and the at least one synchronization signal by determining a first one Offset scalar product of multiple synchronization signals on multiple subcarriers of an OFDM symbol comprising the at least one synchronization signal.

In Example 17, the subject matter of Example 16 may optionally include the pilot signal being a CSR signal.

In Example 18, the subject matter of any of Examples 16-17 may optionally include that the synchronization signal is a secondary synchronization signal (SSS).

In Example 19, the subject matter of any one of Examples 16-18 may optionally include the means for calculating the SNIR of the channel configured to include 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 have a same residual phase to combine coherently.

In Example 20, the subject matter of any of Examples 16-19 may optionally include the first offset scalar product of the multiple pilot signals by calculating the sum of two or more scalar products of corresponding two pilot signals on different subcarriers of the OFDM symbol comprising the at least one pilot signal. is calculated.

In Example 21, the subject matter of Example 20 may optionally include the respective two pilot signals on different subcarriers of the OFDM symbol comprising the at least one pilot signal, adjacent piloted signals of the OFDM symbol comprising the at least one pilot signal associated with a first transmission port , and wherein the adjacent pilot signals of a first of the two or more scalar products are shifted, as compared to the adjacent pilot signals of a second of the two or more dot products, by one or more subcarriers of the OFDM symbol comprising the one pilot signal.

In Example 22, the subject matter of Example 21 may optionally include the channel SNIR computing means 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 the multiple pilot signals of the second offset scalar product are associated with a second transmission port, and wherein the frequency domain spacing between each of the subcarriers of the multiple pilot signals associated with the first transmission port and each of the subcarriers of the multiple pilot signals associated with the second transmission port is 3 + 6 × n subcarrier, wherein n ≥ 0 and n is an integer, and comprising adding the first set scale product and the second offset scalar product.

In Example 23, the subject matter of any of Examples 16-22 may optionally include the first offset scalar product of the multiple synchronization signals by computing the sum of two or more scalar products of corresponding two synchronization signals on different subcarriers of the OFDM symbol containing the at least one synchronization signal includes, is calculated.

In Example 24, the subject matter of Example 23 may optionally include the multiple synchronization signals associated with a first frequency of synchronization signals of the OFDM symbol and the corresponding two synchronization signals on different subcarriers of the OFDM symbol containing the at least one synchronization signal of a first of the two or the plurality of scalar products, as 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 are respectively shifted.

In Example 25, the subject matter of Example 24 may optionally include the channel SNIR computing means configured to compute a second offset scalar product of multiple synchronization signals on multiple subcarriers of the OFDM symbol comprising the at least one synchronization signal multiple frequency synchronization signals of the second offset scalar product are associated with 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 associated with the first sequence and each of the subcarriers of the multiple synchronization signals associated with the second sequence , n · 1 subcarrier, where n> 0 and n is an integer, and to add the first offset scalar product and the second offset scalar product.

In Example 26, the subject matter of any of Examples 20-25 may include that the frequency domain spacing between the subcarriers is 6 * n subcarriers, where n> 0 and n is an integer.

In Example 27, the subject matter of any one of Examples 19-26 may optionally include the means for calculating the SNIR of the channel configured to divide the SNIR by dividing the coherently combined at least one pilot signal and at least one synchronization signal by the difference between the total power of the at least one pilot signal and the at least one synchronization signal, and to calculate the result of the coherent combination of the at least one pilot signal and the at least one synchronization signal.

In Example 28, the subject matter of any of Examples 16-27 may optionally include the input signal received over the channel being 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: a device for estimating a Signal to Noise and Interference (SNIR) ratio on a mobile communication channel, comprising: a UE, comprising: a SNIR calculation module for computing the SNIR of the channel, wherein the SNIR accounting module is configured to estimate the SNIR of the channel based on at least one pilot signal and at least one synchronization signal contained in an input signal received over the channel by calculating the at least one pilot signal by computing 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 computing a first offset scalar product of multiple synchronization signals on multiple subcarriers of an OFDM symbol comprising the at least one synchronization signal; wherein a conjugate multiply and accumulate module is 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 scalar products; and wherein a buffer is configured to buffer input signal samples for a time period long enough to detect at least 7 OFDM symbols, each comprising at least one pilot signal.

In example 30, the subject matter of example 29 may optionally include the at least one pilot signal comprising a CSR signal.

In Example 31, the subject matter of any of Examples 29-30 may optionally include that the at least one synchronization signal comprises a secondary synchronization signal (SSS).

In Example 32, the subject matter of any of Examples 29-31 may optionally include: a total power calculation module configured to calculate the total 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 which are taken into account for calculating the SNIR.

In Example 33, the subject matter of any of Examples 29-32 may optionally include a tap delay module configured to delay the detection of a subcarrier signal up to 6 taps.

In Example 34, the subject matter of any of Examples 29-33 may optionally include at least one of: a time domain signal symbol extraction module configured to extract symbols that extract the at least one pilot signal and the at least one synchronization signal in sequence 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 execute a pilot signal / synchronization signal extraction from the frequency domain subcarriers comprising the at least one pilot signal and the at least one synchronization signal.

In Example 35, the subject matter of Example 34 may optionally include a local pseudo-noise (PN) sequence generator; and a pseudo-Rausoh (PN) decryption and pilot and synchronization signal demodulation module configured to demodulate the at least one pilot signal and the at least one synchronization signal by conjugate multiplying a local pseudo-noise (PN) - Sequence with the extracted frequency domain pilot signal / synchronization signal.

In Example 36, the subject matter of any of Examples 29-35 may optionally include the input signal received over the channel being 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, perform a method of estimating a signal-to-noise and interference (SNIR) ratio on a mobile communication channel that comprises estimating the SNIR of the channel, wherein the Estimating at least one pilot signal and at least one synchronization signal contained in an input signal received over the channel by generating the at least one pilot signal by computing a first offset scalar product of multiple pilot signals on multiple subcarriers of an OFDM symbol comprising the at least one pilot signal; is determined; and the at least one synchronization signal is determined 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.

In Example 38, the subject matter of Example 37 may optionally include instructions that, when executed, use a CRS signal as the pilot signal.

In Example 39, the subject matter of any of Examples 37-38 may optionally include further instructions that, when executed, use an SSS as the synchronization signal.

In Example 40, the subject matter of any of Examples 37-39 may 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 having a same residual phase ,

In Example 41, the subject matter of any of Examples 37-40 may optionally include the first offset scalar product of the multiple pilot signals by calculating the sum of two or more scalar products of corresponding two pilot signals on different subcarriers of the OFDM symbol comprising the at least one pilot signal , is calculated.

In example 42, the subject matter of example 41 may optionally include the multiple pilot signals of the first offset scalar product associated with a first transmission port such that the corresponding two pilot signals on different subcarriers of the OFDM symbol comprising the at least one pilot signal, adjacent pilot signals of the OFDM Symbols comprising the at least one pilot signal, and the adjacent pilot signals of a first of the two or more scalar products, compared to the adjacent pilot signals of a second of the two or more scalar products by one or more subcarriers of the OFDM symbol representing the pilot signal includes, respectively, are shifted.

In Example 43, the subject matter of Example 42 may 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 correspond to a second transmission port and wherein the frequency domain spacing between each of the subcarriers of the multiple pilot signals associated with the first transmission port and each of the subcarriers of the multiple pilot signals associated with the second transmission port is 3 + 6n subcarriers, where n ≥ 0 and n is an integer, and add the first offset scalar product and the second offset scalar product.

In Example 44, the subject matter of any of Examples 37-44 may optionally include the first offset scalar product of the multiple synchronization signals by calculating the sum of two or more scalar products of corresponding two synchronization signals on different subcarriers of the OFDM symbol comprising the at least one synchronization signal , is calculated.

In example 45, the subject matter of example 44 may optionally include the multiple synchronization signals of the first offset scalar product of a first sequence of synchronization signals of the OFDM symbol, and the corresponding two synchronization signals on different subcarriers of the OFDM symbol, which comprises the at least one synchronization signal of a first of the two or more scalar products, as compared to the synchronization signals of a second of the two or more scalar products or a plurality of subcarriers of the OFDM symbol comprising the synchronization signal are respectively shifted.

In Example 46, the subject matter of any one of Examples 37-45 may 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, wherein the multiple synchronization signals of the second And the frequency domain spacing between each of the subcarriers of the multiple sync signals associated with the first sequence and each of the subcarriers of the multiple sync signals associated with the second sequence, n x 1 subcarriers where n> 0 and n is an integer, and add the first offset scalar product and the second offset scalar product.

In Example 47, the subject matter of any of Examples 41-46 may optionally include the frequency domain spacing between the subcarrier signal being 6 * n subcarriers, where n> 0 and n is an integer.

In Example 48, the subject matter of any of Examples 40-47 may optionally include further instructions that when coherently combined combine at least one pilot signal and at least one synchronization signal by the difference between the total power of the at least one pilot signal and the at least one synchronization signal Dividing the result of the coherent combination of the at least one pilot signal and the at least one synchronization signal.

In Example 49, the subject matter of any of Examples 37-48 may optionally include further instructions that, when executed, buffer input signals during a time period long enough to detect at least 7 OFDM symbols each comprising at least one pilot signal.

In Example 50, the subject matter of any of Examples 37-49 may optionally include further instructions that perform one or more of: extracting OFDM symbols comprising pilot signals and synchronization signals from the input signal; Applying a Fast Fourier Transform (FFT) to the extracted OFDM symbols to obtain frequency domain subcarriers; and performing pseudo-noise decoding and demodulation of the OFDM signals comprising the pilot and synchronization signals extracted from the input signal.

In Example 51, the subject matter of any of Examples 37-50 may optionally include the input signal received over the channel being a signal of a multicast broadcast single frequency network operation of the mobile communication channel.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited non-patent literature

• LTE standard limited [0027]

Claims (25)

A method of estimating a signal-to-noise and interference ratio (SNIR) on a mobile communication channel, comprising: Estimating the SNIR of the channel based on at least one pilot signal and at least one synchronization signal contained in an input signal received via the channel, by: Determining the at least one pilot signal by computing a first offset scalar product and a second offset scalar product of multiple pilot signals on multiple subcarriers of an Orthogonal Frequency Division Multiplexing (OFDM) symbol; and Determining the at least one synchronization signal by computing a first offset scalar product and a second offset scalar product of multiple synchronization signals on multiple subcarriers of the OFDM symbol. The method of claim 1, wherein the pilot signal is a cell specific reference (CSF) signal, and the synchronization signal is a secondary synchronization signal (SSS). The method of claim 1 or 2, wherein estimating the SNIR 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 having a same residual phase. The method of any one of claims 1 to 3, wherein the first offset scalar product of the multiple pilot signals is calculated by calculating the sum of two or more scalar products of corresponding two pilot signals on different subcarriers of the OFDM symbol comprising the at least one pilot signal. The method of claim 4, wherein the multiple pilot signals of the first offset scalar product are associated with a first transmission port, the corresponding two pilot signals on different subcarriers of the OFDM symbol comprising the at least one CRS signal, neighbor pilot signals of the OFDM symbol containing the at least one pilot signal, and the neighbor pilot signals of a first of the two or more scalar products, as compared to the neighbor pilot signals of a second of the two or more dot products, by one or more subcarriers of the OFDM symbol comprising the pilot signal; are each shifted. The method of claim 5, wherein 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 associated with a second transmission port and wherein the frequency domain spacing between each of the subcarriers of the multiple pilot signals associated with the first transmission port and each of the subcarriers of the multiple pilot signals associated with the second transmission port is 3 + 6n subcarriers, where n≥0 and n is one is integer, and includes adding the first offset scalar product and the second offset scalar product. Method according to one of claims 1 to 6, wherein the first offset scalar product of the multiple synchronization signals is calculated by calculating the sum of the two or more scalar products of corresponding two synchronization signals on different subcarriers of the OFDM symbol comprising the at least one synchronization signal. The method of claim 7, wherein the multiple synchronization signals of the first offset scalar product of a first sequence of synchronization signals of OFDM symbols are assigned, and the corresponding two synchronization signals on different subcarriers of the OFDM symbol, which comprises the at least one synchronization signal of a first of the two or more scalar products, compared to the synchronization signals of a second of the two or more scalar products by one or a plurality of sub-carriers of the OFDM symbol, which comprises the synchronization signal, are respectively shifted. The method of claim 8, wherein 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 of a second sequence of synchronization signals of the OFDM And the frequency domain spacing between each of the subcarriers of the multiple synchronization signals associated with the first sequence and each of the subcarriers of the multiple synchronization signals associated with the second sequence is n x 1 subcarriers, where n> 0 and n is an integer, and includes adding the first offset scalar product and the second offset scalar product. The method of any one of claims 4 to 9, wherein the frequency domain spacing between the subcarriers is 6 x n subcarriers, where n> 0 and n is an integer. The method of claim 3, wherein estimating the SNIR comprises dividing the coherently combined at least one pilot signal and at least one synchronization signal by 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 a pilot signal and the at least one synchronization signal. The method of any one of claims 1 to 11, further comprising one or more of: Extracting OFDM symbols comprising pilot signals and synchronization signals from the input signal; Applying a Fast Fourier Transform (FFT) to the extracted OFDM symbols to obtain frequency domain subcarriers; and Performing a pseudo-noise decoding and demodulation of the OFDM symbols comprising pilot and synchronization signals extracted from the input signal. The method of any one of claims 1 to 12, wherein the input signal received over the channel is a signal of a multicast broadcast single frequency network operation of the mobile communication channel. Apparatus for estimating a signal-to-noise and interference (SNIR) ratio on a mobile communication channel, comprising: a UE comprising means for calculating the SNIR of the channel, the means being configured to calculate the SNIR of the channel based on at least one pilot signal and at least one synchronization signal contained in an input signal received via the channel, wherein the means for calculating 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 determining 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. The apparatus of claim 14, wherein the means for calculating 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 having a same residual phase. Apparatus according to any one of claims 14 or 15, wherein the first offset scalar product of the multiple pilot signals is calculated by calculating the sum of two or more scalar products of corresponding two pilot signals on different subcarriers of the OFDM symbol comprising the at least one pilot signal. Apparatus according to claim 16, wherein the respective two pilot signals on different subcarriers of the OFDM symbol comprising the at least one pilot signal are neighbor pilot signals of the OFDM symbol comprising the at least one pilot signal associated with a first transmission port, and wherein the neighbor pilot signals of a first of the two or more scalar products are shifted relative to the neighbor pilot signals of a second of the two or more dot products by one or more subcarriers of the OFDM symbol comprising the pilot signal, respectively. Apparatus according to any one of claims 14 to 17, wherein the first offset scalar product of the multiple synchronization signals is calculated 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. Apparatus according to claim 18, wherein the multiple synchronization signals are associated with a first sequence of synchronization signals of the OFDM symbol, and the corresponding two synchronization signals on different subcarriers of the OFDM symbol comprising the at least one synchronization signal of a first one of the two or more scalar products Compared to the synchronization signals of a second of the two or more scalar products by one or more subcarriers of the OFDM symbol, which comprises the synchronization signal are respectively shifted. Apparatus according to any one of claims 15 to 19, wherein the means for calculating the SNIR of the channel is configured to calculate the SNIR by dividing the coherently combined at least one pilot signal and at least one synchronization signal by the difference between the total power of the at least one pilot signal and the at least one Synchronization signal, and to calculate the result of the coherent combination of the at least one pilot signal and the at least one synchronization signal. A system for receiving a mobile communication signal, comprising: an apparatus for estimating a signal-to-noise and interference (SNIR) ratio on a mobile communication channel, comprising: an UE comprising: an SNIR computation module for computing the SNIR of the channel, the SNIR computation module being configured to estimate the SNIR of the channel based on at least one pilot signal and at least one synchronization signal contained in an input signal received over the channel by the at least one pilot signal is determined 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 the at least one synchronization signal is determined 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; wherein a conjugate multiply and accumulate module is 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 scalar products; and a buffer is configured Buffer input signal samples during a period of time long enough to detect at least 7 OFDM symbols each comprising at least one pilot signal. The system of claim 21, further comprising: a total power module configured to calculate the total 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 considered for calculating the SNIR. The system of claim 21 or 22, further comprising at least one of the following: 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 in order 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 execute pilot signal / synchronization signal extraction from the frequency domain subcarriers comprising the at least one pilot signal and the at least one synchronization signal. The system of any one of claims 21 to 23, further comprising: a local pseudo-noise (PN) sequence generator; and a pseudo noise (PN) polling and pilot and synchronization signal demodulation module configured to demodulate the at least one pilot signal and the at least one synchronization signal by conjugately multiplying a local pseudo noise (PN) sequence execute the local PN sequence generator with the extracted frequency range pilot signal / synchronization signal. A computer-readable medium comprising instructions that, when executed on a computer, perform a method of estimating a signal-to-noise and interference (SNIR) ratio on a mobile communication channel according to any one of claims 1 to 13.

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