Improvement in the spectral efficiency (SE) for Device is Device (D2D) is important and essential to get enhancement in the data rate, bandwidth per unit area, the number of connected devices per unit area, availability, coverage, energy usage, and latency. This can be achieved by the implementation of a higher-order modulation technique. But the basic problem is interference. This paper is going to implement higher-order modulation (up to 1024 QAM) with the help of Transport Block Size (TBS) for the Physical Sidelink Shared Channel (PSSCH). Here SE is improving as the order of the modulation or TBS rises. Block error rate (BLER) and the Average number of transmissions are also cultivating as TBS or order of the modulation increasing. Development in the BLER reflects the enrichment in block error due to interference. Here frequency selective fading and additive white gaussian noise (AWGN) are added to the channel to see the effect of fading and noise.
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