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High-speed train (HST) scenarios are expected to be typical scenarios for sixth-generation (6G) wireless communication systems. Due to the high cost, complexity, and time consumption of high-speed measurement campaigns, this particular environment poses challenges for performance measurements. Furthermore, it is not possible to perform repeatable measurements in a controlled high-speed environment in most cases. Using proposed methods of time-stretching the transmit signals, fortunately, such experiments can be emulated at lower velocities by inducing effects caused by highly time-varying channels. Therefore, the cost and complexity of high-speed measurement campaigns are considerably decreased. Foremost, this thesis considers the problem of unequal channel estimation quality between proposed time-stretching methods. This is an auxiliary unwanted side effect of proposed time-stretching …