Orthogonal Time Frequency Space
Orthogonal Time Frequency
Space (OTFS) is a 2D modulation technique that transforms the
information carried in the Delay-Doppler coordinate system. The
information is transformed in the similar time-frequency domain as
utilized by the traditional schemes of modulation such as TDMA,
CDMA, and OFDM. It was first used for fixed wireless, and is now a
contending waveform for 6G technology due to its robustness in
high-speed vehicular scenarios.
OTFS
is a modulation scheme where each transmitted symbol experiences
a near-constant channel gain even in channels at high carrier
frequencies (mm-wave) or with high Doppler. OTFS essentially
performs modulation in the the Delay-Doppler (time-frequency)domain.
It effectively transforms
the time-varying multipath channel into a 2D channel in the
Delay-Doppler domain. Using this transformation, along with
equalization within this domain, each symbol experiences similar
channel gain throughout the transmission.
The modulation begins with
first mapping the information symbols x[k,l] in the Delay–Doppler
domain to symbols X [n, m] for creating the time-domain signal s(t)
which is transmitted over a wireless channel. At the receiver end,
the time-domain signal r(t) is mapped to the domain of
time-frequency using the Wigner transform which is the inverse of
Heisenberg transform and then for symbol demodulation uses the
Delay–Doppler domain.
The technology has been used in 5G networks and is being considered
for
6G networks.
TACS is
one of the leading top consultancies in the field of nG.
TACS
consultants are the first inventors of fixed or mobile packet
radio structures in the world for 2G, 3G, 4G, 5G and 6G wireless
systems.
|
TACS
- Delivers the insight and vision
on technology for strategic decisions on 6G.
- Assesses technologies and standards and develops
architectures for 6G.
- Provides
the energy and experience of world-wide leading innovators and experts in
6G.
|
