Title | ||
---|---|---|
A Technique for Frequency Synchronization in Multi-Band OFDM in Realistic UWB Channel |
Abstract | ||
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This paper presents a highly accurate frequency offset estimation algorithm for multi-band orthogonal frequency division multiplexing
(MB-OFDM) systems effective for realistic ultra-wideband (UWB) environment. The proposed algorithm derives its estimates based
on phase differences in the received subcarrier signals of several successive OFDM symbols in the preamble. We consider different
carrier frequency offsets and different channel responses in different bands to keep the analysis and simulation compatible
for practical multi-band UWB scenario. Performance of the proposed algorithm is studied by means of bit error rate (BER) performance
of MB-OFDM system. In order to compare the variance of the synchronizer to that of the theoretical optimum, we derive the
Cramer–Rao lower bound (CRLB) of the estimation error variance and compare it with the simulated error variance both in additive
white Gaussian noise and UWB channel model (CM) environments, CM1–CM4. Next, we modify the estimation algorithm by proposing
a multi-band averaging frequency offset synchronization (MBAFS) scheme. We establish superior BER performance with MBAFS compared
to our first scheme. We calculate modified CRLB for MBAFS and compare it with simulation results for CM1–CM4. Both analysis
and simulation show that MBAFS algorithm can estimate the carrier frequency offset effectively and precisely in UWB fading
channels for MB-OFDM applications. We also analyze the computational complexity of both the proposed algorithms in order to
verify their feasibility of implementation in practical UWB receiver design. |
Year | DOI | Venue |
---|---|---|
2009 | 10.1007/s00034-009-9122-7 | Circuits Systems and Signal Processing |
Keywords | Field | DocType |
Synchronization, MB-OFDM, UWB, Frequency offset correction, Cramer–Rao bound | Subcarrier,Computer science,Fading,Synchronizer,Frequency offset,Carrier frequency offset,Electronic engineering,Additive white Gaussian noise,Orthogonal frequency-division multiplexing,Bit error rate | Journal |
Volume | Issue | ISSN |
28 | 6 | 1531-5878 |
Citations | PageRank | References |
0 | 0.34 | 13 |
Authors | ||
3 |
Name | Order | Citations | PageRank |
---|---|---|---|
Debarati Sen | 1 | 116 | 19.01 |
Saswat Chakrabarti | 2 | 164 | 22.77 |
R V. Raja Kumar | 3 | 39 | 10.24 |