System and method for utilizing multidimensional constellations
AssigneeHuawei Technologies Canada Co., Ltd.
InventorsHossein Khoshnevis, Ian Marsland, Halim Yanikomeroglu, Ngoc Dung Dao, Nimal Gamini Senarath
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Abstract
Space-time block codes (STBCs) is a known approach for using multiple transmit antennas to provide higher data rates and better reliability by exploiting spatial diversity. Existing STBCs use independent two-dimensional constellations. Methods and systems for using multidimensional constellations to improve the performance of orthogonal STBCs are disclosed. Methods for finding optimized multidimensional constellations for orthogonal STBCs are also disclosed.
Claims21
A method for wireless transmission comprising:
- receiving, by a transmitter of a wireless system, a feedback signal from a receiver, the feedback signal dependent on channel statistic measurements measured by the receiver;
- selecting, by the transmitter, an M-dimensional constellation from a group of possible M-dimensional constellations based on the wireless conditions affecting the wireless transmission as indicated by the feedback signal;
- converting, by the transmitter, a data block to be transmitted into a set of P-dimensional symbols derived from the M-dimensional constellation, wherein M≥3 and P<M;
- encoding, by the transmitter, the set of P-dimensional symbols to form a Space Time Block Code (STBC) matrix;
- and
- transmitting, by the transmitter, the STBC matrix.
A transmitter for a wireless system, the transmitter comprising:
- a plurality (N) of transmit antennas for wireless transmission;
- a converter for mapping a data block to two dimensional (2D) symbols derived from an M-dimensional constellation selected from a number of potential M-dimensional constellations, based on wireless conditions affecting the wireless transmission as indicated by a feedback signal received from a receiver, the feedback signal dependent on channel statistic measurements measured by the receiver;
- and
- a space time block code (STBC) encoder for encoding the 2D symbols onto an STBC transmit matrix for transmission by the N transmit antennas.
A receiver for a wireless system,
- the receiver comprising:
- a plurality of receive antennas;
- a channel statistics module for measuring channel statistics;
- and
- a feedback module for providing a feedback signal to a transmitter as to which of a plurality of multidimensional constellations to use for transmission dependent on the measured channel statistics;
- wherein the feedback module also provides feedback relating to other parameters of the system based on the measured channel statistics;
- wherein the other parameters are selected from the list comprising:
- the number of dimensions (M);
- the number of time slots;
- the number of pilots;
- and
- the forward error correction codes to be used.
A method of transmission comprising:
- receiving, by a transmitter of a wireless system, a feedback signal dependent on channel statistic measurements measured by a receiver;
- mapping, by the transmitter, a data block to be transmitted to an M-dimensional co-ordinate point based on wireless conditions affecting wireless transmission of the transmitter as indicated by the feedback signal;
- converting, by the transmitter, the M-dimensional co-ordinate point into a plurality of P-dimensional co-ordinates, wherein M≥3 and P<M;
- and
- transmitting, by the transmitter, the P-dimensional co-ordinates.
Dependencies are inferred from the claim text.