subcarrier


Also found in: Dictionary, Thesaurus, Medical, Legal, Acronyms, Wikipedia.

subcarrier

[¦səb′kar·ē·ər]
(communications)
A carrier that is applied as a modulating wave to modulate another carrier.

subcarrier

A secondary telecommunications channel that resides within the main channel (a carrier within a carrier). A type of multiplexing, the subcarrier is a modulated carrier signal at a lower frequency that is combined with the main carrier signal running at a higher frequency.

Many Uses
Color TV signals were added in a subcarrier to black and white signals in order to maintain backward compatibility with monochrome TV sets. Stereo was added to FM radio in a subcarrier for compatibility. Subcarriers are also often used to provide the audio channel in a video broadcast. See carrier.
References in periodicals archive ?
In Section 3, the optimal and suboptimal subcarrier and power allocation algorithms for three types of detectors are proposed.
OFDMA frame structure with N = 128 subcarriers Configuration Zero Padding Pilot + Information DC Component Subcarrier Index 0-27 28-63 64 User 1 28 Subcarriers 36 Subcarriers 1 Subcarrier User 2 28 Subcarriers 36 Subcarriers as ZP 1 Subcarrier Configuration Pilot + Information Zero Padding Subcarrier Index 65-100 101-127 User 1 36 Subcarriers as ZP 27 Subcarriers User 2 36 Subcarriers 27 Subcarriers Table 2.
The main idea is to search the unused subcarrier and then reallocate this to the HUEs.
To show the advantage of the subcarrier grouping with power distribution using IWFA algorithms, simulations are performed in multi-path environment.
BPSK-OFDM is applied to calculate the allocated bit number for each subcarrier according to LED response model.
The training symbols and pilot subcarriers are used to correct for the channel response as well as remaining phase drift.
Since 1986, Subcarrier has specialized in the ownership, development and management of high-capacity telecommunication towers and rooftop sites.
1) Discrete multitone modulation/demodulation format: A format that divides data among multiple subcarriers (carrier waves), and multi-level modulation is used for each subcarrier to achieve high transmission speeds.
p]) is the noise component at the estimated channel coefficients in frequency domain and ' kp' denotes a subcarrier index at pth pilot.
Such allocation is particularly the case when distributed subcarrier assignment is employed.