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<p>Conventional far-field, angle-only ISAC beamforming cannot separate communication users from sensing targets that share the same angular sector. This paper introduces a range-domain interference-suppression principle for hybrid near/far-field ISAC, exploiting the asymmetry that near-field beams focus in both range and angle (2D) while far-field beams focus only in angle (1D). On this basis, we derive a bi-directional mixed near/far-field SINR model with range-dependent steering vectors absent from conventional formulations, and prove, via a closed-form single-user analysis, a wavefront-curvature-mismatch effect: under full angular overlap, range-induced channel decorrelation yields an interference-suppression gain that scales with array aperture and inverse user range, opening a new spatial degree of freedom unavailable in pure far- or near-field designs. The resulting non-convex sum-rate problem is solved by an SOCP-based WMMSE–SCA procedure with guaranteed KKT-point convergence. At SNR <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\( = 10\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mo>=</mo> <mn>10</mn> </mrow> </math></EquationSource> </InlineEquation>&#xa0;dB the proposed scheme attains 9.0&#xa0;bps/Hz, surpassing MRT and Random baselines by about <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(60\%\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>60</mn> <mo>%</mo> </mrow> </math></EquationSource> </InlineEquation> and <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(108\%\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>108</mn> <mo>%</mo> </mrow> </math></EquationSource> </InlineEquation> under the 8&#xa0;dB per-user and 25&#xa0;dB radar SINR constraints, with the advantage robust across system parameters.</p>

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Beamforming optimization for ISAC interference suppression via range-domain design in mixed near/far-field scenarios

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  • 发表日期：

    2026年7月17日

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  • Freddy Y. P. Feng,
  • Fan Liu,
  • Suk Chan Kim,
  • Dong Chan Park,
  • Chen Lu,
  • Pei Xiao

摘要

Conventional far-field, angle-only ISAC beamforming cannot separate communication users from sensing targets that share the same angular sector. This paper introduces a range-domain interference-suppression principle for hybrid near/far-field ISAC, exploiting the asymmetry that near-field beams focus in both range and angle (2D) while far-field beams focus only in angle (1D). On this basis, we derive a bi-directional mixed near/far-field SINR model with range-dependent steering vectors absent from conventional formulations, and prove, via a closed-form single-user analysis, a wavefront-curvature-mismatch effect: under full angular overlap, range-induced channel decorrelation yields an interference-suppression gain that scales with array aperture and inverse user range, opening a new spatial degree of freedom unavailable in pure far- or near-field designs. The resulting non-convex sum-rate problem is solved by an SOCP-based WMMSE–SCA procedure with guaranteed KKT-point convergence. At SNR \( = 10\) = 10  dB the proposed scheme attains 9.0 bps/Hz, surpassing MRT and Random baselines by about \(60\%\) 60 % and \(108\%\) 108 % under the 8 dB per-user and 25 dB radar SINR constraints, with the advantage robust across system parameters.