摘要:
For processing samples of a signal received via a channel represented by an impulse response of W−1 coefficients, the method comprises: determining the W roots of the Z-transform of the channel impulse response; producing an intermediate signal by equalizing the received signal by a zero-forcing method or the like based on an impulse response whose Z-transform is a Z−1 polynomial of degree W-p having as roots those of the W roots which are furthest from the unit circle of the complex plane; and then obtaining estimations of the transmitted signal symbols by applying a Viterbi-type equalization method or the like based on an impulse response whose Z-transform is a Z−1 polynomial of degree p having as roots those of the W roots which are nearest to the unit circle.
摘要:
The blocks to be sent on one or more physical channels for packet mode transmission pertain to several temporary block flows to terminals. The terminals are distributed into several subscription classes corresponding to various priority levels and each associated with a throughput restriction parameter. Transmission throug hputs allocated to the flows as a function of transmission throughputs respectively requested during the creation of the flows and restriction parameters associated with the subscription classes are determined. At least one traffic channel supported by a physical channel is allotted to each new flow created. For each send period on a physical channel, a flow to which a traffic channel supported by this physical channel is allotted, is selected with the aid of the values of the transmission throughputs allocated, so as to send a block of the selected flow in the course of said period.
摘要:
A method of estimating a communication path formed of a plurality of channels, the method necessitating an estimate of the impulse response C1, C2, . . . , Cn of the channels, including the following steps of (1) acquiring a space statistic of the transmission path, and (2) establishing a corrected impulse response (C1, C2, . . . , Cn) at least by weighting the impulse responce estimates (C1, C2, . . . , Cn) by the space statistic and an estimate of the additive noise (N01, N02, . . . , N0n) of the channels.
摘要翻译:一种估计由多个信道形成的通信路径的方法,所述方法需要估计脉冲响应C 1,C 2,...。 。 。 包括以下步骤:(1)获取传输路径的空间统计量,以及(2)建立校正的脉冲响应(C 1 / ,C 2 2,...,C n N)至少通过加权脉冲响应估计(C 1,C 2, / SUB>,...,C N n)通过空间统计量和加性噪声的估计(N L1,N N 2,N 2) ...,N 0n SUB>)。
摘要:
A baseband digital signal block is processed at an output of a matched filter and at an input of a channel equalizer. This signal is fed to a whitening filter estimated for the block by taking into account interfering signals in the frequency band of the useful signal and in one or more adjacent bands. To this end, an autocorrelation vector, calculated form the block of received signal is projected onto different directions corresponding to predetermined correlation vectors relating to the useful signal, to signals which may be present in the adjacent bands and to the thermal noise. The coefficients of the whitening filter are then derived from the sum of the projected vectors, by taking into account the energy of the useful signal if the latter has not been cancelled prior to the computation of the autocorrelations.
摘要:
The invention relates to a method of estimating a transmission channel from a signal (S) received by that channel. The received signal corresponds to a transmitted training sequence, and the method includes the following steps: acquiring a statistic of the transmission channel, establishing an estimate (Xp) of the impulse response of the channel weighted by the statistic of the channel of the received signal (S).
摘要:
The invention relates to a method of estimating symbols carried by a digital signal that is received by a receiver over a communication channel (5), said symbols being multiplexed or orthogonal frequency sub-carriers. The inventive method comprises the following steps in relation to each symbol carried by the digital signal, consisting in: performing at least two transforms towards the frequency domain (8,9) on a portion of the received signal essentially corresponding to the symbol, said transforms being performed with a determined time lag (10) therebetween: estimating the parameters (r0, r1, . . . , rn, r′0, r′1, . . . , r′n) of the communication channel from pre-determined binary information contained in the digital signal; and estimating the symbol from a combination of the result of each of the transforms performed and the estimated communication channel parameters.
摘要:
Parameters for the propagation channels between each mobile terminal (14, 14A, 14B) and several fixed transceivers (13) are measured and a report message transmitted to a radio network controller (12), indicating at least one part of the measured parameters. The ratio network controller processes the report messages. The parameters measured for each fixed transceiver are a propagation profile, including at least one propagation path associated with a reception energy and the parameters given in the report messages for at least one transceiver, comprise data on the energetic distribution in the propagation profile, taken into account by the radio network controller in processing.
摘要:
The invention relates to a method of estimating symbols carried by a digital signal that is received by a receiver over a communication channel (5), said symbols being multiplexed or orthogonal frequency sub-carriers. The inventive method comprises the following steps in relation to each symbol carried by the digital signal, consisting in: performing at least two transforms towards the frequency domain (8,9) on a portion of the received signal essentially corresponding to the symbol, said transforms being performed with a determined time lag (10) therebetween: estimating the parameters (r0, r1, . . . , rn, r′0, r′1, . . . , r′n) of the communication channel from pre-determined binary information contained in the digital signal; and estimating the symbol from a combination of the result of each of the transforms performed and the estimated communication channel parameters.
摘要:
The invention relates to a method of estimating symbols carried by a digital signal that is received by a receiver over a communication channel (5), said symbols being multiplexed or orthogonal frequency sub-carriers. The inventive method comprises the following steps in relation to each symbol carried by the digital signal, consisting in: performing at least two transforms towards the frequency domain (8,9) on a portion of the received signal essentially corresponding to the symbol, said transforms being performed with a determined time lag (10) therebetween: estimating the parameters (r0, r1, . . . , rn, r′0, r′1, . . . , r′n) of the communication channel from pre-determined binary information contained in the digital signal; and estimating the symbol from a combination of the result of each of the transforms performed and the estimated communication channel parameters.
摘要:
The mobile terminal according to the invention comprises: means for receiving synchronization signals from a base station of a radiocommunication system; means for sending towards the base station requests for access to communication resources, at respective instants clamped with respect to instants of reception of said synchronization signals; means for determining a level of remoteness with respect to the base station; and means for advancing the instants of sending of the requests for access to communication resources, as a function of the level of remoteness determined by the means for determining a level of remoteness with respect to the base station.