APPLICATION OF NON-TEST METHODS FOR CHANEL ESTIMATION

Abstract

The possibilities of increasing the data rate of adaptive HF communication systems by reducing redundancy in the form of test signals used for its operation are considered. The problem is currently pressing due to increasing demands of modern adaptive data transmission systems to efficient use of allocated frequency-time resource of radio channel. For the problem solution, methods based on the analysis of the received information signal, taking into account the used signal-code construction, are proposed. Approaches for solving problems of non-test adaptive signals correction and channel state estimation in serial data communication systems using convolutional encoder are proposed. Search algorithm for segments used for channel impulse response and equalizer coefficients calculation is shown. In this case, neither a change in decoding algorithms nor calculating of equalizer impulse response is required. Expressions for estimation of the bit error rate for a convolution encoder of general form are given. The presented approaches maintain operating of adaptive HF data transmission systems in channels with intersymbol interference, ensuring the operative change of its parameters when the state of the radio channel changes significantly reducing the use of test signals, or completely abandoning them.

Keywords

• адаптация
• коррекция сигналов
• импульсная характеристика канала
• оценка состояния радиоканала
• вероятность ошибки на бит
• сверточный код