DETAILED ACTION
Notice of Pre-AIA or AIA Status
The present application, filed on or after March 16, 2013, is being examined under the first inventor to file provisions of the AIA .
Claim Rejections - 35 USC § 103
The following is a quotation of 35 U.S.C. 103 which forms the basis for all obviousness rejections set forth in this Office action:
A patent for a claimed invention may not be obtained, notwithstanding that the claimed invention is not identically disclosed as set forth in section 102, if the differences between the claimed invention and the prior art are such that the claimed invention as a whole would have been obvious before the effective filing date of the claimed invention to a person having ordinary skill in the art to which the claimed invention pertains. Patentability shall not be negated by the manner in which the invention was made.
Claims 1-4, 6-11 and 13-18 are rejected under 35 U.S.C. 103 as being unpatentable over Wang (US 2024/0163140) in view of Wigard (US 2022/0173799).
Regarding claims 1 and 14, Wang describes a method of a receiver/receiver comprising a processor, wherein the processor causes the receiver to perform (fig. 9, receiver as communications device 900 having processor 901 to perform method in memory 902), comprising:
performing a demodulation process so that a fractional part of a Doppler shift of a received signal is compensated; and de-spreading the received signal for which the fractional part of the Doppler shift compensated from a first two-dimensional domain to a second two-dimensional domain (fig. 3 & para. 58 + para. 103-108, receiver receives signal from channel in time-frequency domain symbol matrix (first two-dimensional domain) & demodulates which de-maps to delay-Doppler domain symbol matrix (second two-dimensional domain) as part of orthogonal time frequency space (OTFS) to resist (compensate) Doppler shift, para. 4).
Wang fails to further explicitly describe:
a fractional part of a Doppler shift of a received signal is compensated.
Wigard also describing Doppler shift compensation (title) using OTFS between time-frequency (first 2D) domain & delay Doppler (second 2D) domain (para. 4), further describing:
a fractional part of a Doppler shift of a received signal is compensated (para. 138, Doppler shift information compensates the largest (fractional) part of the actual Doppler shift).
It would have been obvious to one with ordinary skill in the art before the effective date of the claimed invention to specify that the Doppler shift being compensated in Wang being a fractional part as in Wigard.
The motivation for combining the teachings is that this so shorten acquisition and access (or handover) times for the UE (Wigard, para. 138).
Regarding claims 2 and 15, Wang and Wigard combined describe:
a fractional part of a Doppler shift of a received signal is compensated (Wigard, para. 138).
Wang and Wigard combined further describe:
wherein the performing of the demodulation process so that the fractional part of the Doppler shift of the received signal is compensated includes:
performing multi-carrier demodulation on multi-carrier symbols of the received signal (Wang, fig. 3 & para. 58, demodulation of received OTFS symbols in a multi-carrier system, para. 4);
de-mapping/obtaining spread data symbols from resources for the multi-carrier-demodulated multi-carrier symbols in the first two-dimensional domain, and
compensating for the fractional part of the Doppler shift for each of the spread data symbols to generate each spread data symbol for which the Doppler shift is compensated (Wang, fig. 3 & para. 58, after transmission across channel, receiver performs mirrored steps: transforming delay-Doppler domain symbol matrix to delay time-domain symbol matrix; and demap the [spread] modulation symbols in the delay-time domain symbol matrix (first 2-dimensional domain) for resisting (compensating) the Doppler shift, para. 4).
Regarding claims 3 and 16, Wang and Wigard combined describe:
a fractional part of a Doppler shift of a received signal is compensated (Wigard, para. 138).
Wang and Wigard combined further describe:
wherein the performing of the demodulation process so that the fractional part of the Doppler shift of the received signal is compensated includes:
performing multi-carrier demodulation on multi-carrier symbols of the received signal (Wigard, fig. 3 & para. 58, demodulation of received OTFS symbols in a multi-carrier system, para. 4);
compensating for the fractional part of the Doppler shift for each of the multi-carrier-demodulated multi-carrier symbols to generate each multi-carrier symbol for which the fractional part of the Doppler shift is compensated; and
obtaining each spread data symbol for which the Doppler shift is compensated from resources for the multi-carrier symbols for which the fractional part of the Doppler shift is compensated in the first two-dimensional domain (Wang, fig. 3 & para. 58, after transmission across channel, receiver performs mirrored steps: transforming delay-Doppler domain symbol matrix to delay time-domain symbol matrix; and demap the [spread] modulation symbols in the delay-time domain symbol matrix (first 2-dimensional domain) to obtain original [spread] data symbols, where the process resists (compensating) the Doppler shift, para. 4);
Regarding claims 4 and 17, Wang and Wigard combined describe:
receiving a reference signal from a transmitter; and estimating the fractional part of the Doppler shift based on the reference signal, wherein in the performing of the demodulation process so that the fractional part of the Doppler shift of the received signal is compensated, the receiver compensates for the fractional part of the Doppler shift by using the estimated fractional part of the Doppler shift (Wang, para. 8-11, receive end channel estimates in delay-Doppler domain based on a received delay-time domain pilot sequence (reference signal) to obtain a channel correlation parameter, and performing, by the receive end, delay-time domain symbol detection on the received signal based on the channel correlation parameter).
Regarding claim 6, Wang and Wigard combined describe:
obtaining data symbols by de-mapping de-spread data symbols from resources in the second two-dimensional domain (Wang, fig. 3 & para. 58, after transmission across channel, receiver performs mirrored steps: transforming delay-Doppler domain symbol matrix (second 2-dimensional domain) to delay time-domain symbol matrix; and de-map the [spread] modulation symbols in the delay-time domain symbol matrix (first 2-dimensional domain);
performing channel estimation on the data symbols in a delay-Doppler domain (Wang, para. 17, performing channel estimation in delay-Doppler domain by yielding a channel correlation parameter) and
performing channel equalization on the data symbols based on the channel estimation (Wang, para. 17, using the yielded channel correlation parameter to apply & obtain the received symbols in delay-time domain).
Regarding claims 7 and 18, Wang and Wigard combined describe:
wherein the first two-dimensional domain corresponds to a time-frequency domain, and the second two-dimensional domain corresponds to a delay-Doppler domain (fig. 3 & para. 58, receiver performs reversed process of transmitter, received time-frequency (first 2D) domain is transformed to delay-Doppler (second 2D) domain symbol matrix through the SFFT).
Regarding claim 8, Wang describes a method of a transmitter, comprising:
mapping data symbols to resources in a first two-dimensional domain (fig. 3 & para. 58, transmitter maps modulation symbols to delay time-domain matrix (first 2D domain);
spreading the data symbols to resources in a second two-dimensional domain so that a Doppler shift for the data symbols is compensated (para. 58, first delay-time domain is transformed to delay Doppler domain symbol matrix (second 2D domain), to resist (compensate) Doppler shift for a multi-carrier system, para. 4); and
performing multi-carrier modulation on each multi-carrier symbol for the spread data symbols (para. 58 in view of para. 4, transmitter performs modulation for the multi-carrier system for the transmit symbols before sending across the channel).
a fractional part of a Doppler shift of a received signal is compensated.
Wigard also describing Doppler shift compensation (title) using OTFS between time-frequency (first 2D) domain & delay Doppler (second 2D) domain (para. 4), further describing:
a fractional part of a Doppler shift of a received signal is compensated (para. 138, Doppler shift information compensates the largest (fractional) part of the actual Doppler shift).
It would have been obvious to one with ordinary skill in the art before the effective date of the claimed invention to specify that the Doppler shift being compensated in Wang being a fractional part as in Wigard.
The motivation for combining the teachings is that this so shorten acquisition and access (or handover) times for the UE (Wigard, para. 138).
Regarding claim 9, Wang and Wigard combined describe:
a fractional part of a Doppler shift of a received signal is compensated (Wigard, para. 138).
Wang and Wigard combined further describe:
performing preprocessing on the data symbols (para. 58, performing vectorization processing to the transmit [data] symbols);
compensating for the Doppler shift for the preprocessed data (para. 58, transforming to time domain through a Heisenberg transform, to resist (compensate) Doppler shift for a multi-carrier system, para. 4) and
mapping the data symbols for which the Doppler shift is compensated to the resources in the second two-dimensional domain (para. 58, first delay-time domain is transformed (mapped) to delay Doppler domain symbol matrix (second 2D domain), to resist (compensate) Doppler shift for a multi-carrier system, para. 4).
Regarding claim 10, Wang and Wigard combined describe:
a fractional part of a Doppler shift of a received signal is compensated (Wigard, para. 138).
Wang and Wigard combined further describe:
performing preprocessing on the data symbols (para. 58, performing vectorization processing to the transmit [data] symbols);
mapping the preprocessed data symbols to the resources in the second two-dimensional domain (para. 58, first delay-time domain is transformed (mapped) to delay Doppler domain symbol matrix (second 2D domain), to resist (compensate) Doppler shift for a multi-carrier system, para. 4);
compensating for the Doppler shift for the data symbols mapped to the resources in the second two-dimensional domain after the preprocessing (para. 58, transforming to time domain through a Heisenberg transform, to resist (compensate) Doppler shift for a multi-carrier system, para. 4)
Regarding claim 11, Wang and Wigard combined describe:
a fractional part of a Doppler shift of a received signal is compensated (Wigard, para. 138).
receiving a reference signal from a receiver (Wigard, para. 153, transmitting network node receives feedback from receiving UE for better [estimated] information at the next transmit opportunity in relation with Doppler shift, para. 120); and
estimating the Doppler shift based on the reference signal (Wigard, para. 153, transmitting network node receives feedback from receiving UE for better [estimated] information at the next transmit opportunity in relation with Doppler shift, para. 120),
Wang and Wigard combined further describe:
wherein in the spreading of the data symbols to resources in the second two-dimensional domain so that the Doppler shift for the data symbols is compensated, the transmitter compensates for the Doppler shift by using the estimated Doppler shift (Wang, para. 58, transmitter maps (spreads) modulation [data] symbols to delay-Doppler domain symbol matrix (second 2D domain) for resisting (compensating) Doppler shift, para. 4),
Regarding claim 13, Wang and Wigard combined describe:
wherein the first two-dimensional domain corresponds to a time-frequency domain, and the second two-dimensional domain corresponds to a delay-Doppler domain (fig. 3 & para. 58, receiver performs reversed process of transmitter, received time-frequency (first 2D) domain is transformed to delay-Doppler (second 2D) domain symbol matrix through the SFFT).
Allowable Subject Matter
Claims 5 and 12 are objected to as being dependent upon a rejected base claim, but would be allowable if rewritten in independent form including all of the limitations of the base claim and any intervening claims.
Regarding claim 5, the prior art fails to further explicitly describe:
transmitting a reference signal to a transmitter; receiving, from the transmitter, information on the fractional part of the Doppler shift estimated based on the reference signal, wherein in the performing of the demodulation process so that the fractional part of the Doppler shift of the received signal is compensated, the receiver compensates for the fractional part of the Doppler shift by using the information on the fractional part of the Doppler shift estimated based on the reference signal, which is received from the transmitter.
Regarding claim 12, the prior art fails to further explicitly describe:
transmitting a reference signal to a receiver; and
receiving, from the receiver, information on the fractional part of the Doppler shift, which is estimated based on the reference signal, wherein in the spreading of the data symbols to resources in the second two-dimensional domain so that the fractional part of the Doppler shift for the data symbols is compensated, the transmitter compensates for the fractional part of the Doppler shift by using the information on the estimated fractional part of the Doppler shift, which is received from the receiver.
For claims 5 and 12, the closest prior art, Patchava (US 2024/0204824) describing coder at transmitter & decoder at receiver second signal shifted (to compensate) relative to the first signal in delay-doppler domain (abstract & fig. 4), in combination with Wang and Wigard, fail to fulfill the additional features as a whole obvious.
Conclusion
The prior art made of record and not relied upon is considered pertinent to applicant's disclosure: Shin (US20240243948) describing method and apparatus for compensating doppler frequency in communication system (title), Pusaria (US 2024/0204928) describing accumulate the measured phase deviation and the doppler shift received from L2, to derive an accumulated phase correction (abstract), Hewavithana (EP 4002784) describing carrier frequency offset correction & doppler mitigation (abstract), Sun (USS 2024/0080224) describing using Doppler shift pre-compensation values for communicating TRS to a UE (abstract), Xu (US 2025/0047543) describing OTFS precoding (abstract), Yuan (US 2025/0047534) describing delay-doppler domain channel estimation for channel decoding (abstract & fig. 2), Zhu (US 2023/0413197) describing doppler shift frequency determination & compensation (title), Manolakos (US 20230216546) describing UE performing doppler pre-compensation (abstract), Bayer (US 2023/0131584) describing local oscillator (1008) comprises a frequency shifted transmitter with encoded RF modulation to compensate for at least a portion of a Doppler shift of the reflected signal (para. 179), Ammann(US 2011/0193745) describing an acquisition unit of a GNSS receiver base band circuit includes an integrator with a number of preprocessors where an incoming digital signal is mixed with different frequency signals to compensate at least in part for clock drift and Doppler shifts (abstract), Abdelghaffar (US 2023/0163928) describing doppler shift compensation (title), and Liu (US 2025/0233787) describing OTFS transmission system with first & second type block for compensating frequency offset & channel estimation (abstract).
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WARNER WONG
Primary Examiner
Art Unit 2469
/WARNER WONG/Primary Examiner, Art Unit 2469