{"id":"671b2cf0-7c24-499a-931b-50dcd9a68578","arxiv_id":"2508.03460","paper_version":1,"verdict":"UNVERDICTED","confidence":"LOW","novelty_score":5.0,"correctness_risk":"unknown","formal_verification":"none","parameter_count":0,"one_line_summary":"The provided full text is a different paper than the claimed ISAC work, so no result can be verified.","lead":"The submission cannot be reviewed as-is: the metadata and abstract describe an ISAC cell-free MIMO paper, but the full text is an unrelated paper on LLM-based contract design. The claimed DTDD spectral-efficiency doubling is therefore unverified.","discovery_kind":"unclear","skeptic_critique":{"model":"deepseek-v4-flash","headline":"The provided full text is a different paper, so the claimed DTDD spectral-efficiency doubling and GLRT robustness are unverifiable; the verdict should remain UNVERDICTED until the correct manuscript is supplied.","rationale":"In good faith, the paper's intended claim is a quantitative spectral-efficiency gain from dynamic TDD in cell-free massive MIMO ISAC, plus robustness of a proposed GLRT. For that claim to hold, the submitted manuscript would need to contain the system model, the GLRT derivations, the SE expressions, and the numerical setting behind the 90th-percentile comparison. The supplied full text contains none of these; it is a different arXiv submission on contract theory. The reader correctly identified this mismatch and returned UNVERDICTED, which is the appropriate disposition: the claim is not refuted, but it cannot be assessed. I partially agree with the reader's weakest_assumption. The reader also proposed a substantive technical assumption about spatial separation of half-duplex APs and fidelity of the simulation framework; those are plausible concerns, but they are secondary to the document-level failure. Without the correct manuscript, any technical critique would be speculation. The proposed concrete test is a document-integrity check followed by a matched simulation recomputation; this would settle whether the doubling claim survives. Since my read does not alter the reader's verdict, I recommend UNCHANGED. No judgment is made about the authors' intent; the issue is that the available artifact does not contain the claimed research.","tokens_in":20285,"tokens_out":2143,"duration_ms":27726,"concrete_test":"Retrieve the submission source for arXiv identifier 2508.03460 directly from arXiv and verify that its title, author list, and abstract match the ISAC/DTDD paper. If they do not, obtain the correct version before any technical review. Once the correct text is available, locate the spectral-efficiency simulation and recompute the 90%-likely sum UL-DL SE for both DTDD and the traditional TDD baseline under matched assumptions (same AP/user count, same transmit power, same large-scale-fading realization); if the ratio is not approximately 2, the headline claim is unsupported.","verdict_should_be":"UNCHANGED","load_bearing_attack":"The central claims—that DTDD doubles the 90%-likely sum UL-DL SE relative to traditional TDD-based CF-mMIMO ISAC and that the GLRT is robust to inter-AP interference—require a system model, signal equations, channel and CSI assumptions, detection-theoretic derivations, and simulation curves. None of these appear in the supplied full text, which is arXiv:2508.03464, an unrelated paper on LLM-empowered contract design for AIGC offloading in teleoperation. Every load-bearing component of the abstract is therefore currently unsupported: the DTDD scheduling with half-duplex APs sharing time-frequency resources, the centralized and distributed GLRTs, the Bayesian CRB for RCS estimation, the SINR-optimal combiner with cross-link and radar interference, the two target precoders, and the numerical benchmark producing the 2x SE gain. This is not an internal inconsistency in the ISAC argument; it is a document-identity failure that makes the central claim impossible to check. A secondary concern, relevant only after the correct text is obtained, is whether the spatial separation of DL and UL APs is actually enforced by the channel model and whether the traditional TDD baseline is matched in user set, pilot overhead, and transmit power; if not, the reported doubling could reflect an unfavorable baseline rather than a genuine DTDD advantage. But the primary blocker is the absence of the intended manuscript.","agreement_with_reader":"partial"},"referee_report":{"model":"deepseek-v4-flash","summary":"The submission carries the title 'Joint Sensing and Bi-Directional Communication with Dynamic TDD Enabled Cell-Free MIMO' and an abstract describing centralized and distributed GLRTs for target detection, a Bayesian Cramér-Rao bound for RCS estimation, an SINR-optimal combiner, two target precoders, and a numerical claim that DTDD doubles the 90%-likely sum UL-DL SE relative to traditional TDD-based CF-mMIMO ISAC. However, the full text supplied is a completely different manuscript, 'Learning to Incentivize: LLM-Empowered Contract for AIGC Offloading in Teleoperation' (arXiv:2508.03464), which contains no ISAC, cell-free MIMO, dynamic TDD, or radar content. None of the claimed technical derivations, system models, or simulation results appear anywhere in the provided text.","tokens_in":20469,"tokens_out":2921,"duration_ms":33464,"significance":"The claimed ISAC contributions, if they were present and correct, would be of interest to the cell-free massive MIMO and integrated sensing and communication communities, particularly the reported DTDD spectral-efficiency doubling and the robustness of the GLRT to inter-AP interference. The submitted manuscript, however, provides no evidence for these claims: the full text is an unrelated paper on LLM-empowered contract design for AIGC offloading. The significance of the claimed contributions cannot be assessed from the submitted text, and the manuscript in its current form makes no verifiable contribution to the ISAC literature.","major_comments":[{"comment":"The abstract promises a paper on joint sensing and bi-directional communication with dynamic TDD cell-free MIMO, including centralized and distributed GLRTs, Bayesian CRB, SINR-optimal combiners, and two precoders. The full text is a paper titled 'Learning to Incentivize: LLM-Empowered Contract for AIGC Offloading in Teleoperation,' whose abstract, sections, equations, and simulations concern teleoperation, diffusion models, and contract theory. None of the claimed ISAC content appears anywhere in the submitted full text.","section":"Abstract vs. Full Text"},{"comment":"All load-bearing technical claims are unsupported: the GLRT derivations, the Bayesian CRB, the SINR-optimal combiner, the target precoders, and the numerical result that DTDD doubles the 90%-likely sum UL-DL SE require a system model, signal equations, channel and CSI assumptions, and simulations. The provided Sec. 3 formulates a contract-design optimization problem (P1–P3), and Sec. 5 reports teleoperator utility and AIGC service quality experiments; neither section contains any ISAC or cell-free MIMO mathematics.","section":"Sec. 3 and Sec. 5"},{"comment":"The abstract's central quantitative claim that 'DTDD doubles the 90%-likely sum UL-DL SE compared to traditional TDD-based CF-mMIMO ISAC systems' is not backed by any simulation in the supplied full text. The numerical results in the provided manuscript concern utility improvements of 5–40% for a teleoperator and contract-design benchmarks, not spectral efficiency. The claimed performance result is therefore unverifiable from the submitted document.","section":"Numerical Studies"}],"minor_comments":[{"comment":"The arXiv identifier shown in the full text (arXiv:2508.03464) does not match the submission identifier (arXiv:2508.03460), which is consistent with the document-identity mismatch between the abstract and the full text.","section":"Document identity"},{"comment":"The full text's title, author list, and abstract differ entirely from those of the submission; the journal header 'JOURNAL OF LATEX CLASS FILES, VOL. 14, NO. 8, AUGUST 2015' and the GitHub code link are those of the LLM contract paper, not of an ISAC paper.","section":"Title and author list"},{"comment":"The index terms and references in the supplied text (e.g., teleoperation, large language model, contract theory, and references [4], [5], [22]–[26]) belong to the LLM contract-design paper; the expected ISAC/cell-free MIMO references are absent.","section":"References and index terms"}],"recommendation":"reject","confidential_remarks":"This is a manuscript-identity failure. The correct paper is not present; the abstract and full text belong to different submissions. The manuscript cannot be evaluated as an ISAC paper and should be returned to the authors to supply the correct full text. This is a load-bearing error that cannot be fixed within the manuscript's current scope, so rejection is the appropriate outcome. If the authors supply the intended paper, a fresh review would be needed."},"author_rebuttal":null,"desk_editor":{"model":"deepseek-v4-flash","letter":"First, the thing to know: the full text attached to this submission is not the paper described in the abstract. arXiv:2508.03460 is supposed to be about dynamic TDD cell-free massive MIMO for ISAC, with GLRTs, Bayesian CRB, and a claimed SE doubling. What was actually submitted is arXiv:2508.03464, an unrelated paper about LLM-empowered contract design for AIGC offloading in teleoperation. None of the promised content—system model, derivations, simulations—is present. The verdict has to be UNVERDICTED, and the reader's low soundness score is appropriate not because the ISAC math is suspect but because there is no ISAC math to inspect.\n\nThe abstract itself is coherent and describes a plausible research direction. Applying dynamic TDD to ISAC in cell-free massive MIMO with half-duplex APs is a natural next step for the subfield, and a doubling of the 90%-likely sum UL-DL SE would be a meaningful result if it holds up. But I can't confirm or refute any of it from the submitted text. The centralized and distributed GLRTs, the Bayesian CRB for RCS estimation, the SINR-optimal combiner with cross-link and radar interference, the two target precoders, and the numerical benchmark are all absent. There is nothing checkable.\n\nI want to be clear that the unrelated LLM paper is not obviously bad. It has a structured problem formulation, an algorithm, experiments, and a public code repository. But it is a different submission, and it does not help evaluate the ISAC claims.\n\nIf the correct manuscript appears, the referee's main technical question should be whether the DTDD scheduling actually enforces spatial separation between UL and DL APs in the channel model, and whether the traditional TDD baseline is matched in user set, pilot overhead, and transmit power. An unfair baseline could produce the reported doubling without a genuine DTDD advantage. That concern is secondary, though; it presumes we have the right paper.\n\nMy recommendation: don't send this to peer review as-is. Desk-reject or return it and ask the authors to resubmit with the correct full text. The abstract alone suggests the underlying work may deserve a serious referee, but you can't referee a paper whose content is missing. Get the right file first.","headline":"The submitted full text is a different paper, so the ISAC claims are untestable; the correct manuscript must be obtained before any reviewer looks at it.","tokens_in":21058,"tokens_out":3432,"would_cite":false,"duration_ms":37409,"reading_group":"no","serious_thinker":"unclear","would_accept_peer_review":false},"rs_alignment":null,"lean_confirmation":null,"pith_extraction":{"msc":[],"pacs":[],"model":"deepseek-v4-flash","headline":"Dynamic TDD cell-free MIMO doubles the 90th-percentile UL-DL spectral efficiency in ISAC systems while using half-duplex access points.","keywords":["dynamic time division duplex","cell-free massive MIMO","integrated sensing and communication","generalized likelihood-ratio test","half-duplex access points","spectral efficiency","radar cross-section estimation","uplink-downlink coexistence"],"falsifier":"Run the same comparison of DTDD versus conventional TDD cell-free ISAC with inter-AP interference at realistic levels, for instance with APs placed in a dense topology or with correlated shadowing; if the claimed doubling of the 90%-likely sum UL-DL spectral efficiency disappears, or if a GLRT detection probability drops materially when inter-AP interference is strong, the central claim fails. A field measurement of UL-DL coexistence would settle it directly.","tokens_in":20038,"feed_emoji":"📡","tokens_out":5813,"duration_ms":64393,"temperature":0.7,"pith_summary":"This paper argues that dynamic time division duplex (DTDD) turns a cell-free massive MIMO network into a joint sensing and communication system without needing full-duplex hardware: spatially separated half-duplex access points can serve uplink and downlink users on the same time-frequency resources while some of them simultaneously receive target echoes. The paper develops centralized and distributed generalized likelihood-ratio tests (GLRTs) for detecting a target when uplink user signals are treated as sensing interference, and it benchmarks radar cross-section estimators against the Bayesian Cramér-Rao lower bound. It also derives an SINR-optimal uplink combiner that accounts for cross-link and radar interference, and two downlink precoders for the target signal, one protecting downlink users and one maximizing illumination of the target. Numerical results are claimed to show the GLRT is robust to inter-AP interference and that DTDD doubles the 90%-likely sum uplink-downlink spectral efficiency relative to traditional TDD-based cell-free ISAC, on half-duplex hardware.","feed_headline":"Dynamic TDD doubles 90%-likely spectral efficiency in cell-free ISAC","feed_subtitle":"Half-duplex access points serve uplink, downlink, and target sensing at once, doubling the 90th-percentile sum spectral efficiency.","key_machinery":"The load-bearing machinery is the dynamic TDD schedule itself, which partitions APs into uplink and downlink groups whose simultaneous transmissions are made coherent by spatial separation. On top of it sit the generalized likelihood-ratio tests (GLRTs), one centralized and one distributed, that treat UL user signals as sensing interference; the SINR-optimal uplink combiner that suppresses cross-link and radar interference; and the two target precoders: a user-centric precoder that nulls interference to DL users and a target-centric precoder built on the dominant eigenvector of the composite target-AP channel. Radar cross-section estimation is benchmarked against the Bayesian Cramér-Rao lower bound.","core_discovery":"The central claim is that DTDD lets a cell-free massive MIMO ISAC system break the TDD orthogonality between uplink and downlink without full-duplex radios: by assigning different half-duplex APs to uplink and downlink and by letting uplink APs double as echo receivers, the same time-frequency resource carries UL data, DL data, and target sensing simultaneously. The paper's headline numerical finding is that this arrangement doubles the 90%-likely sum UL-DL spectral efficiency compared with a conventional TDD-based CF-mMIMO ISAC baseline, while the proposed GLRT detectors remain robust to inter-AP interference. The authors support this with a unified framework that jointly detects UL user data and estimates target RCS, an SINR-optimal UL combiner, and two DL precoding strategies for the target signal.","pith_inferences":["The doubling result may hinge on the specific AP-user geometry of the simulation; deployments where uplink and downlink APs are not well separated could see a smaller gain.","A natural extension the authors leave implicit is joint optimization of the AP mode assignment, which APs go uplink versus downlink, together with transmit powers and precoders.","The two target precoders likely form a Pareto frontier; one could interpolate between them to balance user protection and target illumination."],"forward_implications":["Half-duplex access points suffice for simultaneous uplink, downlink, and sensing, so full-duplex hardware is not required to realize the gain.","The robustness of the GLRT to inter-AP interference makes distributed detection viable with reduced backhaul demand.","The user-centric and target-centric precoders give network designers a trade-off between protecting downlink users and concentrating energy on the target.","The unified UL data detection and RCS estimation framework offers a path to joint communication and sensing performance benchmarking against the Bayesian Cramér-Rao lower bound."],"supporting_citations":[],"fun_headline_variants":["DTDD doubles 90th-percentile SE in cell-free ISAC","Half-duplex APs double cell-free ISAC spectral efficiency","Dynamic TDD breaks orthogonality to double SE","Cell-free ISAC: DTDD doubles 90% likely sum SE","Robust GLRT and doubled SE via dynamic TDD"],"cache_read_input_tokens":3200,"weakest_assumption_plain":"Everything hinges on the assumption that spatially separating uplink and downlink half-duplex APs keeps simultaneous same-frequency transmissions from interfering destructively, and that the simulation framework used to compute the 90%-likely spectral efficiency gain faithfully represents real channel conditions.","fun_headline_variants_meta":{"raw":{"variants":["DTDD doubles 90th-percentile SE in cell-free ISAC","Half-duplex APs double cell-free ISAC spectral efficiency","Dynamic TDD breaks orthogonality to double SE","Cell-free ISAC: DTDD doubles 90% likely sum SE","Robust GLRT and doubled SE via dynamic TDD"]},"model":"deepseek-v4-flash","effort":"low","cost_usd":0.000996,"raw_usage":{"total_tokens":4285,"prompt_tokens":1077,"completion_tokens":3208,"prompt_tokens_details":{"cached_tokens":384},"prompt_cache_hit_tokens":384,"prompt_cache_miss_tokens":693,"completion_tokens_details":{"reasoning_tokens":3120}},"tokens_in":693,"tokens_out":3208,"duration_ms":25744,"temperature":1.0,"reasoning_tokens":3120,"cache_read_input_tokens":384,"cache_creation_input_tokens":0},"cache_creation_input_tokens":0},"created_at":"2026-08-06T04:24:58.591562+00:00","model_set":{"reader":"deepseek-v4-flash"},"falsifier":"Run the same comparison of DTDD versus conventional TDD cell-free ISAC with inter-AP interference at realistic levels, for instance with APs placed in a dense topology or with correlated shadowing; if the claimed doubling of the 90%-likely sum UL-DL spectral efficiency disappears, or if a GLRT detection probability drops materially when inter-AP interference is strong, the central claim fails. A field measurement of UL-DL coexistence would settle it directly.","supporting_citations":[],"review_version":1}