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523 results about "Channel capacity" patented technology

Channel capacity, in electrical engineering, computer science, and information theory, is the tight upper bound on the rate at which information can be reliably transmitted over a communication channel.

Promotion server using video on demand channel

Idle Video-On-Demand (VOD) channel capacity is used to deliver promotional content to selected set-top boxes (STBs) in a cable television network. Commercial segment cues are used to instruct a set-top box to switch away from a broadcast program to the VOD channel during a commercial segment, and then switch back again to the original broadcast program at the end of the segment.
More particularly, a promotion server determines an asset to be distributed such as a targeted promotion item (e.g., a commercial), and a list of STBs that are to receive it. The promotion server causes the video promotion content to be stored in VOD servers located at the head ends. A scheduler process then delivers schedule messages to head end message servers which identify each promotion asset, and an STB which is to receive it. The head end message server notifies its associated VOD server which then cues the asset by loading the asset, starting the asset, but pausing it. Prior to the occurrence of a commercial slot in a broadcast program, an asset trigger is inserted into the broadcast stream at the head end. This asset trigger contains general information concerning the asset to be sent, and an idle VOD channel number. The STB receives the asset trigger and readies itself to tune to the VOD channel when cued for at the beginning of a commercial segment, but does not yet tune to the VOD channel. Upon detection of a commercial cue tone in the broadcast channel, the head end message server sends a tune away trigger to the STB, and also instructs the VOD server to start playing the cued promotion. When the STB receives a tune away trigger, it switches from the broadcast channel being played to the selected idle VOD channel, and the promotion is viewed.

Frequency and power distributing method based on NOMA (non-orthogonal multiple access) system

The invention relates to a frequency and power distributing method based on an NOMA (non-orthogonal multiple access) system. The frequency and power distributing method comprises the following steps: confirming a user set for sending information to a cell by a base station and obtaining CSI (channel state information) of the user set at a base station end; distributing each sub channel to a user with the best CSI condition, and regarding the user as a strong user; based on this, combining the strong user with other users in sequence, calculating a maximum channel capacity value of each pair of sets, selecting one pair of set with maximum channel capacity value, and regarding another user in the set as a weak user; distributing two users which are respectively the strong user and the weaker user on each sub channel, wherein the set comprising the strong user is a strong user set Omega A, and the set comprising the weak user is a weak user set Omega B; performing optimal power distribution on the strong user and the weak user on each sub channel respectively. The method can meet large-scale user transmission needs in the future, and increases access probability of the user, so that the spectrum efficiency of the system is improved.

Increasing channel capacity of TDMA transmitters in satellite based networks

The present invention discloses a method for increasing the channel capacity of a communications network, comprising a plurality of one-way TDMA transmitters sharing said channel, and at least one compatible receiver, by reducing transmission collisions among said transmitters. This is achieved by coupling a Global Navigation Satellite System (GNSS) decoder, such as a GPS receiver, to each transmitter, and limiting transmissions to discrete time slots, determined by timing signals provided by said GNSS. Further, this basic set of time slots is divided into several sub sets, and each transmitter selects a sub set of time slots according to its geographic location, in order to enable reusing time slots in spaced apart areas, as frequencies are reused in cellular networks. Then, each transmitter selects its own transmission time slot, from said sub set, in a way that statistically minimizes collisions among nearby transmitters. The present invention does not intend to ensure collision-free communications, yet is projected to reduce the transmission collision rate among simplex in nature transmitters, which have no means to detect other transmissions, or discover if a transmission was successful. One embodiment of this invention is related to distress radio beacons in satellite based Search and Rescue (SAR) systems, such as Cospas-Sarsat.

Method for self-adaption selection of relay strategy for multi-relay collaboration communication

A self-adapting method which is used for a relay strategy of a multiple-relay cooperative communication respectively selects an appropriate retransmission mode and distributes a corresponding transmission power for each relay code according to the state of current real-time channel. Or a direct transmission mode is decided to be selected in order to realize the maximization of the channel capacity of the system and provide a high-efficiency communication under the state of reliability. The method mainly comprises the following operation procedures: (1) estimating the channel, (2) selecting a cooperative partner, (3) choosing an optimum relay strategy for each rely with the result of channel estimation and partner selection, (4) respectively calculating the capacity of the direct transmission channel and the capacity of the channel of the selected relay plan according to the formula of channel capacity, and (5) taking the plan with larger capacity of the equivalent channel as a final selection result. The method determines whether the relay is used according to the current channel state, and selects an optimum retransmission strategy for each relay under the precondition that the reliability and availability of the communication are considered and reasonably distribute power between the signal source and each relay.

Method and apparatus for optimization of channel capacity in multi-line communication systems using spectrum management techniques

The present invention advantageously provides a method and apparatus for optimization of channel capacity in multi-line multi-tone communications such as X-DSL among subscriber lines which are bundled with one another. In an embodiment of the invention an apparatus for optimizing channel capacity of multi-tone communications effected by opposing sets of modems coupled to one another by a plurality of subscriber lines is disclosed. The apparatus includes a spectrum manager coupled to at least one of the opposing sets of modems. The spectrum manager includes: a profiler, a demand module and an optimizer. The profiler obtains from the at least one of the opposing sets of modems the spectral characteristics of each of the plurality of subscriber lines. The demand module determines for each of the plurality of subscriber lines the subscriber demand profile. The optimizer defines target parameters for at least one of bit loading, and power spectral density (PSD) for selected tones of the multi-tone communications based on the spectral characteristics from the profile module and the demand profiles from the demand module and downloads the target parameters to the at least one of the opposing sets of modems.

Multidimensional constellation mapping based coding and modulating method, demodulating and decoding method and system

ActiveCN102075487AIncrease the order of diversityError preventionMultiple carrier systemsBase codeFrequency spectrum
The invention relates to a multidimensional constellation mapping based coding and modulating method, demodulating and decoding method and system. The coding and modulating method comprises the following steps of: carrying out channel coding and bit interleaving on input information bits to obtain coded interleaved bits; carrying out K-dimensional pulse amplitude modulated constellation mapping on the coded and interleaved bits to obtain a constellation mapping symbol of a K-dimensional real-number vector, wherein K is a positive integer; carrying out constellation rotation on the constellation mapping symbol to obtain a multidimensional rotated constellation mapping symbol of the K-dimensional real-number vector; and carrying out dimension conversion and general real-number interleaving on the multidimensional rotated constellation mapping symbol to obtain a coded and modulated symbol, and outputting the coded and modulated symbol. The method and system in the invention can ensure that the performances of a coding and modulating system and a corresponding demodulating and decoding system approach the channel capacity at medium and low frequency spectrum efficiency under the AWGN (Added White Gaussian Noise) and fading channel conditions and meanwhile, the throughput of the system is taken into consideration.

Channel capacity optimization method of intelligent reflector MISO wireless communication system

The invention discloses a channel capacity optimization method for an intelligent reflector MISO wireless communication system, and the method comprises the steps: building an intelligent reflector MISO wireless communication system model; secondly, representing the channel capacity by using a beamforming emission strategy, and establishing a channel capacity optimization mathematical model, wherein the channel capacity is related to a transmitting beam forming vector v and a reflection matrix phi, and optimally describing the channel capacity as a problem (P1); then, decomposing the problem (P1) into two sub-optimization problems of an optimized transmitting beam forming vector v and an optimized reflection matrix [phi], and obtaining the optimal solutions of v and [phi]; and finally, performing alternate iterative optimization on the two sub-optimization problems until convergence, and taking [phi] as an optimal reflection matrix at the moment, thereby obtaining the final optimization result of the problem (P1). According to the invention, the system performance is optimal by adjusting the reflection coefficient of the reflection matrix; and the adopted alternating optimization algorithm is suitable for configuring a reflection matrix, the calculation complexity is low, and the performance of the intelligent reflecting surface system is effectively improved.

System and transceiver for DSL communications based on single carrier modulation, with efficient vectoring, capacity approaching channel coding structure and preamble insertion for agile channel adaptation

A system for Digital Subscriber Line (DSL) data communications, and therefore the transceiver that contains the transmitter and the receiver implementing such system, based on Single Carrier Modulation (SCM). The invention includes an efficient vectoring structure that provides novel solution for crosstalk (505 and 506) elimination in SCM systems, which allows the cooperative operation at the transmitter (511) side as well as at the receiver (512) side.
The present invention also includes a preamble insertion in a specific location of the transmission path, which makes possible the synchronization, direct channel response (503 and 504) estimation, crosstalk channel responses estimation and noise (507 and 508) estimation in agile manner, to make a continuous tracking of the changes of the channel (503 to 506) and the noise environment (505 to 508). It allows operation with low noise margin.
For approaching the capacity of the channel the present invention also defines the blocks that compose the forward error correction and their corresponding location to operate near to the channel capacity limit.
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