摘要:
In an orthogonal frequency division multiplexed (OFDM) system, a transmitter and/or receiver communicate separate data streams on non-orthogonal spatial channels. Each spatial channel may use the same set of OFDM subcarriers and may take advantage of the multipath characteristics of the spatial channel allowing the communication of additional data without an increase in frequency bandwidth. Space-frequency subcarrier modulation assignments may be dynamically assigned on a per subcarrier basis as well as a per spatial channel basis to help maximize the data-carrying capacity of the channel. In some embodiments, each of the spatial channels may be associated with one of a plurality of spatially diverse antennas. In other embodiments, beamforming may be performed to allow the transmission and/or reception of signals within the spatial channels.
摘要:
In a multiple-input multiple-output (MIMO) multicarrier communication system, a mobile station sends a quantized time-domain representation of the channel transfer function to a base station for use by the base station in generating beamforming coefficients for use in subsequent transmissions to the mobile station. In some embodiments, the quantized time-domain representation of the channel transfer function may be generated from selected most significant rays of an initial estimated sampled channel impulse response. Other embodiments may be described and claimed.
摘要:
A frame structure for communicating over a high-throughput communication channel includes a channelization field as part of a current data unit to indicate a frequency and space configuration of subsequent portions of the current data unit.
摘要:
A system, apparatus, method and article to provide compensation of non-linear transmitter distortion are described. The apparatus may include a receiver node (130) to receive information from a transmitter node (120). The receiver node (130) may include a clipping ratio estimation module (142) to determine parameters of non-linearity of a transmitter at the receiver node (130), a training signal predistortion block (150) to generate predistorted training symbols at the receiver node (130) using the parameters of non-linearity, and a channel equalization block (146) to performing linear equalization at the receiver node (130) using the predistorted training symbols. Other embodiments are described and claimed.
摘要:
To mitigate the effects of non-linear amplification in a digital transmission system employing a multi-carrier multiplexing communications technique, such as orthogonal frequency division multiplexing or discrete multi-tone, predistortion of an input signal to a power amplifier with a non-linear transfer characteristic is performed in the frequency domain by modifying frequency-domain symbols used to modulate individual sub-carriers. The frequency-domain symbols are modified in a manner that compensates for the amplifier's non-linear transfer characteristic.
摘要:
A system, apparatus, method and article to provide compensation of non-linear transmitter distortion are described. The apparatus may include a receiver node (130) to receive information from a transmitter node (120). The receiver node (130) may include a clipping ratio estimation module (142) to determine parameters of non-linearity of a transmitter at the receiver node (130), a training signal predistortion block (150) to generate predistorted training symbols at the receiver node (130) using the parameters of non-linearity, and a channel equalization block (146) to performing linear equalization at the receiver node (130) using the predistorted training symbols. Other embodiments are described and claimed.
摘要:
A multicarrier signal is generated by pre-compensating frequency-domain subcarrier symbols for substantially linear distortion subsequently introduced by a time-domain baseband filter.
摘要:
In a multicarrier transmitter that transmits two or more spatial data streams, a bit distributor assigns encoded bits to the spatial data streams based on bit-loading capabilities of the streams and in a manner to intermix the bits among the spatial streams.
摘要:
Systems that communicate in a wireless network using a first and a second frequency band are described herein. The systems may use the first frequency band to transmit or receive a control signal, enabling subsequent communication using the second frequency band.
摘要:
Briefly, a wireless communication system that may transmit and/or receive a data packet that may be generated by at least one of the wireless communication devices operated within the wireless communication system. The data packet may include at least one of a compatibility preamble field, a prefix training field, a physical layer convergence protocol header, a data field, a bit power load field and a postfix training field. At least some of the data packet fields may be encoded with a predetermined code and may be modulated by a predetermined modulation scheme.