Title :
Implementation of an OFDM baseband with adaptive modulations to grouped subcarriers for millimeter-wave wireless indoor networks
Author :
Choi, Chang-Soon ; Shoji, Yozo ; Ogawa, Hiroyo
Author_Institution :
Nat. Inst. of Inf. & Commun. Technol., Yokosuka, Japan
fDate :
11/1/2011 12:00:00 AM
Abstract :
This paper presents the developed orthogonal frequency division multiplexing (OFDM) baseband processor employing adaptive modulations to grouped subcarriers, and its demonstration in millimeter-wave wireless indoor links. Channel measurements and characterizations are performed in line-of-sight (LOS) office environments where the developed OFDM system is supposed to be used. The OFDM baseband processor utilizes 192 data subcarriers among 256 FFT numbers. To minimize bit-error-rate (BER) performance in frequency selective channels of millimeter-wave wireless indoor links, these 192 data subcarriers are grouped into 24 subcarrier groups and independently modulated according to channel characteristics in each subcarrier group. We demonstrate it incorporating with the developed 70 GHz self-heterodyne transceiver. BER measurements and maximum TCP throughput test are performed in practical millimeterwave indoor environments. The results verify the advantages of the proposed adaptive modulation in OFDM and show better BER performance as well as higher throughput performance than a typical OFDM system.
Keywords :
OFDM modulation; adaptive modulation; error statistics; fast Fourier transforms; indoor radio; radio networks; radio transceivers; BER measurements; FFT numbers; OFDM baseband modulations; adaptive modulations; bit-error-rate performance minimization; channel characteristics; channel measurements; data subcarriers; frequency 70 GHz; frequency selective channels; grouped subcarriers; line-of-sight office environments; maximum TCP throughput test; millimeter-wave wireless indoor networks; orthogonal frequency division multiplexing baseband processor; self-heterodyne transceiver; Antenna measurements; Baseband; Millimeter wave communication; Modulation; OFDM; Wireless communication; IEEE 802.11ad; IEEE 802.15.3c.; OFDM; adaptive modulation; millimeter-wave communication;
Journal_Title :
Consumer Electronics, IEEE Transactions on
DOI :
10.1109/TCE.2011.6131123