Nokia Corporation

Nokia Mobile Phones Limited

Kiran Kumar Kuchi

Ari T Hottinen

Olav Tirkkonen

Jianzhong Zhang

Heikki Ilmari Berg

Pekka A Ranta

Markku Kuusela

Venkatesh Vadde

Jan C Olivier

Yrjo Kaipainen

Gian Paolo Mattellini

Pekka Kaasila

Jianzhong (Charlie) Zhang

Andrei Malkov

Jyri K Ham&auml;l&auml;inen

An I/Q MIMO detection framework is a practical means to realize interference cancellation (IC) gains when GMSK, 8PSK signals interfere with each other in synchronous GSM/EDGE networks, thereby providing coverage, capacity, and throughput gain. Further, the presented algorithm applies to a high data rate system concept, in which multiple signals are transmitted from the base station (BTS) through multiple antennas.

I/Q MIMO detection for single antenna interference cancellation

A method for space-time-frequency coding pieces of data includes receiving a stream of a plurality of pieces of data in a multi-antenna transmission system, where the data may comprise a stream of orthogonal frequency division multiple access (OFDMA) symbols, orthogonal frequency division multiplexed (OFDM) symbols or the like. The pieces of data are then coded across space, time and frequency dimensions based upon a plurality of space-time-frequency (STF) codes. The pieces of data are coded such that one or more STF codes in the frequency dimension differ from one or more other STF codes in the frequency dimension. In this regard, the frequency dimension can include a plurality of frequency bins such that the pieces of data can be coded in a manner whereby the plurality of STF codes sequentially circulates through sets of at least one frequency bin in the frequency domain.

System and method for space-time-frequency coding in a multi-antenna transmission system

A power synthesizer is in several (n) discrete stages, each stage having a discrete amplitude, constant envelope amplifier coupled in series with a continuous phase modulator. Each modulator is actuated simultaneously, but not necessarily to modulate the signal phase similarly. For circuit power combining, the modulators are coupled to inputs of the amplifiers, while the separately modulated and amplified bits are combined prior to being fed to the antenna. For spatial power combining, each modulator is coupled to the input of an amplifier which in turn feeds one of several antennas. Each stage operates on one bit, and each successive nstage amplifies the input bit by a factor of a0/2. Preferably, a discrete amplitude generator converts an (analog) output of an IFFT block to a binary sequence, and each bit is fed to a separate stage. The power synthesizer converts a digital output of the discrete amplitude generator to analog at RF rather than at baseband, rendering a baseband DAC, and a separate upconverter, unnecessary.

Method and apparatus for discrete power synthesis of multicarrier signals with constant envelope power amplifiers

Apparatus, and an associated method, for performing joint equalization of received data vectors, received during operation of a multiple-input, multiple-output communication system. Slicing operations, implemented alternately as group slicing operations, decoupled slicing operations, and successive slicing operations are implemented at a joint equalizer of a receiving station of the multiple-input, multiple-output communication system. Once jointly equalized, equalized data vectors are provided to a joint decoder.

Apparatus, and associated method, for performing joint equalization in a multiple-input, multiple-output communication system

A method and apparatus for providing hopped delay diversity for multiple antenna transmissions. In the method and apparatus, an input symbol stream is offset in time by M symbol periods to generate or offset symbol stream. The offset input stream may be offset so as to lead or lag the original input symbol stream. The original input symbol stream is then transmitted on a first set of N antennas and the offset input symbol stream is transmitted on a second set of N antennas, with transmit diversity techniques applied to the transmissions from the first and second set of N antennas.

Hopped delay diversity for multiple antenna transmission

Method and apparatus for soft bit computation with a reduced state equalizer. The method assures that the number of states in the equalizer is reduced to obtain acceptable complexity, while also ensuring that soft bit computation is performed for substantially all bits. The method involves computing a first set of soft bits from bits transmitted in a received signal, using a reduced-state trellis with finite non-zero delay, calculating hard decisions in response to the received signal, and also ensuring that substantially all soft bits are computed by employing zero-delay soft decision-making or decision-feedback equalization to compute a second set of soft bits. Furthermore, the hard decisions are used to compute the second set.

Soft bit computation for a reduced state equalizer

The transmit diversity and symbol rate in a wireless mobile system are increased by allocating the complex symbols to be transmitted in accordance with a time-space slot format that incorporates non-orthogonal-based matrices, defined as matrices whose format is such that the product of the matrix and its Hermitian transpose is other than the identity matrix times a real number other than unity. The non-orthogonal-based matrices are indexed by antenna and by symbol period. Copies and complex conjugates (or negative complex conjugates) of the same symbol that are transmitted from different antennas are mutually separated into non-adjacent parts of the slot. Each non-orthogonal-based 'space-time' matrix is composed of orthogonal-based matrices, i.e., matrices other than non-orthogonal-based matrices. Preferably, sequences of complex conjugates are time-reversed in the slot.

ISI-robust slot formats for non-orthogonal-based space-time block codes

A method of operation of a filter () of a receiver () of a mobile station or a base station of a radio access network and corresponding equipment, the method for use in suppressing co-channel interference and based on separating the in-phase (I) and quadrature phase (Q) components of the received signal and then performing whitening on a symbol-by-symbol basis, i.e. the whitening operation is done within one symbol. The invention provides a filter () including a module () for performing IQ whitening (either according to the invention or otherwise), and also provides a switch () that can be used to enable or disable IQ whitening, depending on the character of the received signal, and in particular based on the noise plus interference correlation matrix ({tilde over (R)})

Method and apparatus for suppressing co-channel interference in a receiver

The present invention presents a method and apparatus for phase hopping and space-time coding signals for transmission on multiple antennas. The method and apparatus provides expansion of a N&times;N&prime; space time block code to a M&times;M&prime; space time block code, where M>N, by using phase hopping on the symbols within the N&times;N&prime; space time block code to allow transmission of the space time block code on a number of diversity antennas greater than N&prime;. A result of M antenna diversity may be achieved for M transmit antennas.

Non-zero complex weighted space-time code for multiple antenna transmission

A method and apparatus for space-time coding signals for transmission on multiple antennas. A received input symbol stream is transformed using a predefined transform and transmitted on a first set of N antennas. The same input symbol stream is then offset by M symbol periods to generate an offset input symbol stream. The offset input symbol stream is then transformed using the predefined transform and transmitted on a second set of N antennas. A third through X set of N antennas may be utilized for transmission by successively offsetting the offset input symbol stream by an additional M symbol periods for each additional set of N antennas used, before performing the transform and transmitting on the additional set of N antennas.

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Irving, TX, United States of America

Kiran Kumar Kuchi