Link Margin for Wireless Radio Communication Link

Abstract

The systematic evaluation of the link budget calculation for the satellite and terrestrial communication is presented in this article. Communication link between the satellite and earth station is dependent on various propagation and associated losses which are either constant or vary with weather conditions. Role of receiver noise, antenna pointing mechanism, atmospheric effects, slant height, interferences, bit error rate on the link margin are detailed in this article. Various equations for link budget calculation and a comparative table at various frequency bands are shown in this article which is useful for predicting link margin of LEO, GEO and Deep space missions. Tele-command, telemetry and ranging link margin at various frequencies are presented and budget analysis at Ka-band frequency performed.

A Novel Loss Tolerant Data Transmission Schemes for Airborne Telemetry System of a Long Range Aerospace Vehicle

“…The effect on link margin parameters with proposed redundancy schemes is tabulated in Table 2 using theoretically calculated values 22 . The first row of Table 2 consists of the link budget 22 calculations of the existing link taken as reference with BER of 10^-6.…”

“…The effect on link margin parameters with proposed redundancy schemes is tabulated in Table 2 using theoretically calculated values 22 . The first row of Table 2 consists of the link budget 22 calculations of the existing link taken as reference with BER of 10^-6. For the FS scheme can be observed, due to increase in data rate the range drops by 50% with other link parameters kept constant.…”

Dynamically tuneable pre‐modulation filter for an airborne PCM/FM telemetry system

“…The multiplexed data is converted into a serial data and then coded as a NRZ-L or Bi-phase data [1] in the PCM encoder. The serial data is further applied to the pre-modulation filter (PMF) as recommended by IRIG-106 [3]. This continuous serial data passes through a lowpass Bessel filter [1] called as a PMF to suppress higher order harmonics and thus band limit the signal.…”

“…In the launch scenario, the telemetry system has to transmit data from the launch point to the end point of a vehicle. The system has to meet the link margin [1,3,4] of a long-range aerospace vehicle with respect to the ground receiving stations. As the data rate increases, the required bandwidth also increases, resulting in a decrease in signal to noise ratio (SNR) for a defined bit error rate.…”

Development and Performance Analysis of Bisection Method-Based Optimal Path Length Algorithm for Terrestrial Microwave Link

“…As the adoption of wireless communication across the globe increases, wireless communication link designers seek to adopt measures to ensure optimal performance of the system. One factor that significantly impacts on system performance is the communication link path length [2][3][4][5]. Generally, the maximum link path is determined from the knowledge of the link parameters applied in the link budget equation [6][7][8][9][10][11][12].…”