Method Of Maintaining Coherency Of A Precoding Channel In A Communication Network And Associated Apparatus

In prior art  selection of precoding granularity is affected by two inter-restricting factors  i.e.  precoding accuracy and channel estimation at a mobile terminal. To solve this problem  the present invention provides a method of maintaining coherency of a precoding channel in a communication network and an associated apparatus. During precoding  this method takes into account both channel coherency and system capacity. A base station adjusts phase and/or amplitude of a precoding matrix corresponding to each precoded unit to maintain coherency of associated information of the overall precoding channel. The associated information of the precoding channel includes  for example  CSI or eigenvalue matrix of the precoding channel. Afterwards  a mobile terminal performs channel estimation based on reference signals of multiple precoded units  thereby eliminating the limitation in prior art that a mobile terminal can perform channel estimation only within one or more resource block limited by a precoding granularity.

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