arXiv:2610.21888v1 Announce Type: new Abstract: Ambiguity function (AF) characterizes the delay--Doppler sidelobe structure that governs target resolution and masking in radar sensing. In ISAC, however, random communication symbols make the AF data-dependent, complicating its characterization and incorporation into transmit design. This raises a fundamental question: which AF characteristic can be effectively controlled through beamforming in a practical multiuser multitarget (MUMT) MIMO--OFDM system? To answer this, we statistically characterize the discrete-periodic AF (DP-AF) and derive an exact closed-form expected sidelobe level (ESL). We observe that nonzero-Doppler ESL cuts are delay-flat and the full two-dimensional integrated sidelobe level ratio (ISLR) is invariant to beamforming, whereas the zero-Doppler peak-to-sidelobe ratio (PSLR) remains controllable. We accordingly formulate an AF-aware joint beamforming and subcarrier-allocation problem with target-wise PSLR and illumination constraints. Since the direct PSLR constraint is intractable, we characterize its global optimum and prove that, for symbol kurtosis greater than one, the PSLR is maximized if and only if each target-wise directional-power profile is flat across subcarriers. We then introduce the coefficient of variation (CV) to measure deviation from this flatness and derive tight CV-dependent PSLR bounds. The lower bound yields a convex sufficient constraint for a desired PSLR, enabling an efficient reformulation. Simulations show $9.4$--$11.0$ dB worst-case PSLR gains over communication-only beamforming at the flat-spectrum point with a $2.4$--$5.9\%$ sum-rate loss. The CV-relaxed formulation achieves $99.7\%$ of the average sum-rate of the original PSLR-constrained problem, while reducing runtime by factors of $10.35$--$12.15$ under the considered scenarios.