Network-aware adjacent channel interference rejection and out of band emission suppression

Abstract

A system and method for adaptively utilizing transmitter windowing, receiver windowing and alignment signals for minimizing interference and maximizing capacity and energy efficiency based upon the received power ratios of links in adjacent bands of a cellular communication network.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority to U.S. Provisional Patent Application No. 62 / 623,330 filed on Jan. 29, 2018, entitled “Network-Aware Adjacent Channel Interference Rejection and Out of Band Emission Suppression” and to U.S. Provisional Patent Application No. 62 / 609,866 filed on Dec. 22, 2017, entitled “Enhancing Performance of Beyond 5G Networks Through Adaptive Windowing and CP Alignment, both of which are incorporated by reference herein in their entirety.GOVERNMENT SUPPORT STATEMENT[0002]This invention was made with government support 1609581 awarded by the National Science Foundation. The Government has certain rights in the invention.BACKGROUND OF INVENTION[0003]Near-far problem is one of the most critical issues in wireless communication networks, significantly limiting network capacity. Received power of a transmitter's signal located far from a base station is much less than that of a nearer transmitter due to increased propagati...

AI Technical Summary

Benefits of technology

The present invention provides a method for optimizing windowing in cellular communication networks to minimize network interference and maximize network capacity. This is done by determining a normalized received power for each link between a transmitter and a receiver, ranking the links based on the received power, and maximizing windowing for the links with higher or lower rankings. The invention also provides a system for carrying out this method and computer-readable media for implementing the method on a computing device.

Problems solved by technology

Near-far problem is one of the most critical issues in wireless communication networks, significantly limiting network capacity.

Received power of a transmitter's signal located far from a base station is much less than that of a nearer transmitter due to increased propagation losses.

Without precautions, the adjacent channel interference (ACI) due to nearer transmitters can severely diminish the signal to interference plus noise ratio (SINR) of the far node's received signal in the uplink (UL) for frequency division multiple accessing (TDMA) systems, resulting in the far transmitter's signal being undetectable at the base station.

However, these measures limit network capacity and the flexibility of the system.

This continuous synchronization increases user equipment (UE) power consumption, and the added device complexity and precision requirements increase UE costs.

Such asynchronous transmission is inherently non-orthogonal and interference is unavoidable.

Another critical problem that affects communication systems that use the OFDM waveform is its peak-to-average power ratio (PAPR), or the crest ratio, The PAPR is defined as the ratio of the peak power of the analog waveform to its average power.

This results in a loss of information as the input cannot be inferred from the output waveform.

Furthermore, the relationship between the input and the output is also not linear, even in the linear region, for practical amplifiers.

This nonlinear relationship degrades the output signal, which decreases the signal to noise ratio (SNR) if the degradation is considered a noise, causes subcarriers of a multicarrier signal to interfere with one another, referred to as inter-carrier interference (WO, and increases the OOB emission.

Therefore, high PAPR values degrade many aspects of the communication.

This is not acceptable in the current cellular communication standards.

Furthermore, extending the symbol duration relentlessly causes the symbol duration to exceed the coherence time of the channel, which is a critical problem for high-speed vehicular communications.

However, this scheme still dos not comply with the standard frame structure.

However, determining whether it is more beneficial to window a duration at the transmitter or receives has not been previously addressed.

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