Protocol Sequences for the Multiple-Packet Reception Channel Without Feedback

2016 ◽  
Vol 64 (4) ◽  
pp. 1687-1698 ◽  
Author(s):  
Yijin Zhang ◽  
Yuan-Hsun Lo ◽  
Wing Shing Wong ◽  
Feng Shu
Keyword(s):  
Reception Channel ◽  
Protocol Sequences

ON SOFTWARE IMPROVEMENT OF IMAGE CHANNEL SUPPRESSION IN SDR RECEIVERS WITH ANALOG CONVERSION TO A LOW INTERMEDIATE FREQUENCY

2020 ◽  
pp. 45-52
Author(s):  
A. S. Yurkov
Keyword(s):  
Signal Processing ◽  
Direct Method ◽  
Digital Signal ◽  
Intermediate Frequency ◽  
Algebraic Equations ◽  
Recursive Filter ◽  
Linear Algebraic Equations ◽  
Reception Channel ◽  
Image Channel ◽  
Parasitic Phase

A method for digital signal processing in SDR receivers with analog conversion to a low intermediate frequency is proposed. In contrast to known systems, the proposed approach does not consider parasitic phase and amplitude distortions, but uses the direct method minimizing of the signal of the mirror reception channel. Generally speaking, this can be done simultaneously at several frequencies. It is shown that in computational terms, this is reduced to signal processing by an algorithm similar to a digital non-recursive filter, and to determine its coefficients, it is sufficient to solve a system of linear algebraic equations.

scholarly journals Shift-Invariant Protocol Sequences for the Collision Channel Without Feedback

2009 ◽  
Vol 55 (7) ◽  
pp. 3312-3322 ◽  
Author(s):  
Kenneth W. Shum ◽  
Chung Shue Chen ◽  
Chi Wan Sung ◽  
Wing Shing Wong
Keyword(s):  
Protocol Sequences ◽  
Collision Channel Without Feedback

scholarly journals Development of a direct penetrating signal compensator in a distributed reception channel of a surveillance radar

2021 ◽  
Vol 2 (9 (110)) ◽  
pp. 16-26
Author(s):  
Hennadii Khudov ◽  
Serhii Yarosh ◽  
Oleksandr Droban ◽  
Oleksandr Lavrut ◽  
Yurii Hulak ◽  
...  
Keyword(s):  
Transmission Coefficient ◽  
Matched Filter ◽  
Direct Method ◽  
General Structure ◽  
Main Channel ◽  
Signal Amplifier ◽  
Direct Penetration ◽  
Reception Channel ◽  
Weighting Coefficients ◽  
Complex Transmission

General structure of a compensator of a direct penetrating signal in the diversed reception channel was developed. It is advisable to use the antenna and the receiver of the auxiliary diverted reception channel as an auxiliary antenna and an auxiliary channel. To be able to suppress the penetrating signal in the band of the receiving device of the surveillance radar, distance between the antennas should be up to 6 m. In general, the compensator of the penetrating signals should contain an adder in which the signals received by the main channel are added with the signals received by the auxiliary channel and sent through the amplifier with a corresponding complex transmission coefficient. The direct penetration signal compensator features the obligatory condition of adjusting the value of the complex transmission coefficient of the auxiliary channel signal amplifier. The direct penetration signal compensator is digital and uses the direct method of forming weighting coefficients without the use of feedback. To reduce the time of formation of weighting coefficients when using direct methods of calculation of the correlation matrix, the technology of parallel computational processes was used. The quality of operation of the direct penetrating signal suppression system in the diverted reception channel was evaluated. It was established that without the use of suppression of direct penetrating signals, their powerful response at the output of the matched filter mask weak echo signals. When using a direct penetrating signal in the main channel of the compensator, its response at the output of the matched filter is significantly reduced. This makes it possible to observe weak echoes against the background of a strong penetrating signal. The use of the developed direct penetrating signal compensator provides suppression of the direct penetrating signal from 57 dB to 70 dB

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