Telefonaktiebolaget Lm Ericsson (publ)

Ericsson Gmbh

Johan Skold

Mikael Hook

Peter Schramm

Carl Magnus Frodigh

Linus Ericsson

Frank Muller

Per-Olof Eriksson

Muhammad Ali Kazmi

Olav Queseth

Perols B Gudmundson

Jon K Ugland

Peter Bjork

Leif Linus Ericsson

Andras Antal Toth

Nils Edvardsson

The present invention relates to a method and arrangements where each frequency channel is assigned a primary (global) number and a secondary (in-band) number. In accordance with embodiments of the present invention the primary number for one frequency channel (e.g. unicast downlink channel) and one or more secondary channel numbers to account for the corresponding unicast uplink and/or for one or more MBSFN channels are signalled. The primary (global) number indicates the band and frequency channel number while the secondary (in-band) number indicates the frequency channel within the relevant frequency band.

Numbering of radio frequency channels

A method of demodulating voice or data and control information in systems that support multiple modulation schemes modulates voice or data using a first linear modulation scheme, such as 16QAM modulation scheme, and modulates control information using a second linear modulation scheme, for example, QPSK modulation scheme, that has the same symbol rate as that of the first modulation scheme. The first linear modulation scheme has a higher modulation level than the second linear modulation scheme. Information modulated using the second linear modulation scheme, which uses a reduced signal set of the first linear modulation scheme, are demodulated using the same demodulator that is used for demodulating information modulated using the first linear modulation scheme. Also, in-band signalling information within a traffic channel, such as stealing flags, are modulated using the second modulation scheme.

Method for demodulating information in a communication system that

Time dispersion of a signal that has been received from a channel is measured by utilizing metrics to determine the energy inside an equalizer window and outside of the equalizer window. In one embodiment, the estimate of the energy outside the window is a difference between residual interference estimates. In another embodiment, the estimate of the energy outside the window is a difference between residual impulse response power estimates.

Time dispersion measurement in radio communications systems

Apparatus, and an associated method, for estimating an interfering-signal component portion of a receive signal received at a receiver. The training sequence associated with the interfering-signal component portion is determined, even without prior knowledge of the training sequence associated with such interfering-signal component portion. Once the training sequence of the interfering-signal component portion is determined, the receive signal is selectively, jointly-detected utilizing a joint detector, the interfering-signal component portion of the receive signal is better able thereby to be canceled or otherwise suppressed.

Receiver apparatus, and associated method, for receiving a receive

A communication system supports multiple modulation schemes having differing symbol rates. The system supports two modulation schemes that have the same symbol rate and at least one modulation scheme that does not have the same symbol rate. For as long as communication can be carried out using the modulation schemes with the same symbol rate, the system avoids using the modulation scheme with different symbol rate, even if communication can be carried out using this scheme.

Link adaptation method for links using modulation schemes that have

Method and apparatus for channel estimation

A method in connection with digital mobile radio communication systems for forming, in a receiver, a quality measure SQ of the signal vector received in a signal burst comprises forming a first estimate E.sub.s of the energy of the useful signal of the signal vector, forming a second estimate E.sub.n of the energy of the remaining signal components of the signal vector, and forming the quality measure SQ of the signal vector in accordance with the formula SQ=K.sub.1 E.sub.s /(K.sub.2 +E.sub.n), where K.sub.1 and K.sub.2 are predetermined constants.

Method for forming a quality measure for signal bursts

According to method and apparatus for communication in a cellular TDMA mobile radio communication system with channel hopping, base and mobile stations transmit radio signal bursts in time slots of a plurality of radio channels in accordance with channel hopping schemes. All of the schemes used by a base and mobile stations in a cell are free from coincidence on any radio channel with any other of the schemes used for transmission within the same cell. A scheme used by a mobile station in one cell occasionally coincides on a radio channel with a scheme used by a mobile station in another cell. The major part of every channel shifting scheme used by a mobile station in a cell is free from coincidence on any radio channel with the major part of any channel hopping scheme used by a mobile station in another cell. The signal to interference ratio or other signal characteristics such as signal strength or bit error rate for signals received by mobile stations are estimated and compared, and the output power of stations are controlled. The existence of further possible channel hopping schemes in a cell, free from coincidence on every radio channel with every other of the channel hopping schemes already in use in that cell, is checked. When another connection to a particular mobile is desired and there is a possible mobile scheme free from coincidence, the desired connection is established using the possible channel hopping scheme in the cell, only if the estimated C/I for certain mobile stations involved in connections exceeds a minimum level.

Frequency and channel hopping communication in a TDMA cellular mobile

Signals in synchronizing sequences and data sequences are transmitted over a fading channel to a sequence estimation receiver. The signals are received by a plurality of mutually separated antennas and sampled to produce received antenna signals (S.sub.in,r (k)). Using the received antenna signals, part transmission channel estimates (h.sub.est,r) are formed for each antenna. These part channel estimates are used to form precomputed metric values (f.sub.a,r ((.DELTA.T.sub.ij),g.sub.a (.DELTA.T.sub.ij)). For the sequence estimation algorithm, branch metric values (m(.DELTA.T.sub.ij,k)) are formed by combining the precomputed metric values with the received antenna signals for state transitions (.DELTA.T.sub.ij). For one state transition there is formed a metric value such as the sum of a metric value (M(T.sub.j,k-1)) for an old state (T.sub.j) at a preceeding sampling time point (k-1) with a branch metric value (m(.DELTA.T.sub.ij,k)). Corresponding metric values are formed for all state transitions to the new state (T.sub.i) and the state corresponding to the smallest of these metric values is chosen in accordance with the sequence estimation algorithm.

Method of and apparatus for reducing the complexitiy of a diversity

A method of synchronizing a received signal frame in a TDMA radio system with a locally generated (TR) training sequence and of determining a channel estimate based on the comparison the received signal frame and the locally generated training sequence. A center of energy value is calculated for a first vector having M correlation values. A second vector having N consecutive correlation values distributed around the center of energy is chosen to form the channel estimate. The center of energy in the second vector can be chosen as synchronizing position.

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Johan Skold