Page 333 - Kaleidoscope Academic Conference Proceedings 2024

EFFECTIVE UTILIZATION OF SPECTRUM FOR NEXT GENERATION WIRELESS
COMMUNICATION SYSTEMS

Sonali, and Subhas Mondal
5G Business Unit, HFCL Limited, Bangalore-560103, India
Email: sonali@hfcl.com and subhas.mondal@hfcl.com

ABSTRACT crucial metric for the telecommunication sector. With every
decade, we are advancing with the next-generation
The earlier idea of the communication system was to focus networks. With 5G+ or 6G communication networks, we
on modulation and channel coding schemes as separate
target a data rate ≈ of 1 Tbps and a connection density of
entities. However, later the perspective of coded 10 devices/Km [4]. The ambitious goal of 6G to provide a
7
2
modulation was introduced by coding theorists and system
1 Gbps data rate per user poses significant challenges,
designers. In this manuscript, we propose a Low Density particularly in the allocation and utilization of suitable
Parity Check (LDPC) coded and bit-interleaved precoder,
frequency bands. One solution lies in the potential FR3
which is added before a 256-Quadrature Amplitude band, which spans 7 to 24 GHz. However, merely
Modulation (QAM) and Reed-Solomon (RS) coded system.
leveraging this frequency range is insufficient without
This technique significantly enhances the spectral efficiency substantial advancements in spectral efficiency. Spectral
(measured in bits per two-dimensional symbol) and
efficiency, which measures how effectively a given
improves the performance of coded modulation over a bandwidth is utilized, must be significantly enhanced to
fading channel. By bitwise interleaving at the encoder
meet the stringent data rate requirements. The potential FR3
output, the system disperses errors, making them easier to band offers a promising avenue due to its relatively higher
correct, while RS codes provide additional reliability by
frequency range, which inherently supports higher data
correcting symbol errors. Consequently, the proposed rates compared to lower bands. However, this comes with
method boosts both spectral efficiency and overall system
its own set of challenges, including increased propagation
reliability, ensuring high data integrity in challenging losses and potential interference issues. Similarly in the
transmission environments.
recent trends, optical wireless communication is also
Keywords – Bandwidth limited channels, Beyond 5G considered in the ITU telecommunication sector. This band
communication, LDPC, RS. offers huge channel bandwidth but to effectively utilize this
bandwidth, we need adoption of scheme that enhances the
1. INTRODUCTION spectral efficiency of the system.
The expeditious advancement in the latest emerging
telecommunication technologies, like artificial intelligence,
the Internet of Things, and virtual reality, has prompted the
need for substantial traffic volume [1]. While the traffic
volume was approximately 62 Exabytes (EB) per month in
2020 [2], the International Telecommunication Union (ITU)
expects the global mobile traffic volume to reach 5016 EB
per month by 2030 (Fig. 1). This voluminous increase in
network traffic also translates to an increase in traffic per
user. By 2030, the traffic per user will increase to 257
Gigabytes (GB) compared to 5.3 GB in 2020 [3], Mobile
subscriptions are also estimated to reach 17.1 billion by
2030 than the 10.7 billion figure in 2020 [4]. Hence, a high
data rate with reliable connectivity will be required to
support these applications.
The exponential Internet traffic advancement demands huge
transmission capacity on the underlying infrastructure of Figure 1 Predicted global traffic volume.
wireless communication systems. Thus, the on-
demand bandwidth provisioning capability is growing as a

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