This paper presents the mathematical model for symbol error probability of triangular quadrature amplitude modulation\nin a single-input multi-output environment. The symbol error probability performance is evaluated over fading channels\nnamely Rayleigh, Nakagami-m, Nakagami-n, and Nakagami-q. The maximal-ratio combining technique is considered as\nspatial diversity algorithm and unified moment-generating-function-based approach is applied to derive the results. The\nmultiple channels considered are independent but not necessarily identically distributed. The results presented are valid\nfor slow and frequency non-selective fading channels only. The symbol error probability expressions obtained contain\nsingle integrals with finite limits and integrand composed of elementary functions which help us evaluate our analytical\nexpressions numerically. We also compare these expressions with the error performances obtained through computer\nsimulation, which show excellent agreement. In addition, an example has been simulated to validate our derived\nmathematical expressions.
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