Design and analysis of adaptive coding schemes for multipath fading channels

Abstract

Wireless communication is characterized by multipath fading, path loss and interference due to white noise. Multipath fading results in time variation of the signal amplitude and phase with time delay that minimize the reliability of communications by increasing the bit-error rate (BER) in data transmission [1]. In order to minimize the BER, there are many types of modulation and error control techniques were introduce and with appropriate combination, optimize wireless system can be achieved. Several features have been identified and recommended in [2] to maximize system capabilities and adaptive data communication system is one of them to ensure the system deliver high throughput and robust in good and poor channels respectively. This is accomplished by varying the modulation and coding scheme according to the channel condition [3]. Usually, an adaptive data communication includes additional features such as sounding or control channel and link quality analysis (LQA) used to estimate channel condition and decide which modulation and channel coding suitable for appropriate time. The parameters estimated are bit-error rate (BER), packet-error rate (PER) and instantaneous signal-to-noise ratio (SNR) [4,5].