Method and apparatus for reducing peak-to-average ratio in a CDMA communication system

A base station comprising:

• a plurality of pilot generator means for generating a plurality of pilot signals wherein each pilot signal is composed of a plurality of pilot symbols;
• and
• symbol accumulation reduction means for varying at least one of said pilot signals, said symbol accumulation reduction means comprising symbol attenuation means for reducing the energy of at least one of the pilot symbols in said plurality of pilot signals by gating off said at least one of the pilot symbols.

A base station comprising:

• a plurality of pilot generator means for generating a plurality of pilot signals wherein each of the pilot signals is composed of a plurality of pilot symbols, and wherein said pilot signals are generated as a concatenation of Walsh sequences and the complements of Walsh sequences;
• and
• symbol accumulation reduction means for varying at least one of said pilot signals.

A base station comprising:

• a plurality of pilot generator means for generating a plurality of pilot signals wherein each pilot signal is composed of a plurality of pilot symbols;
• and
• symbol accumulation reduction means for varying at least one of said pilot signals, the symbol accumulation reduction means comprising a phase rotation means for altering the phase of said at least one of said pilot signals, wherein said phase rotation of each of said at least one of said pilot signals is determined in accordance with a quasi orthogonal function.

The base station of claim 10 wherein said quasi orthogonal function is a binary orthogonal function.

In a base station in which a plurality of pilot signals are simultaneously transmitted, a method for transmitting said pilot signals comprising the steps of:

• generating a plurality of pilot signals including a common pilot and a plurality of auxiliary pilot signals, wherein each of the pilot signals is composed of a plurality of pilot symbols;
• and
• altering at least one of said pilot signals to reduce symbol accumulation in said plurality of pilot signals.

In a base station in which a plurality of pilot signals are simultaneously transmitted, a method for transmitting said pilot signals comprising the steps of:

• generating a plurality of pilot signals wherein each pilot signal is composed of a plurality of pilot symbols;
• and
• altering at least one of said pilot signals to reduce symbol accumulation in said plurality of pilot signals by reducing the energy of at least one of the pilot symbols in said plurality of pilot signals, the energy reduction of said at least one of the pilot symbols comprising gating off said at least one of the pilot symbols.

In a base station in which a plurality of pilot signals are simultaneously transmitted, a method for transmitting said pilot signals comprising the steps of:

• generating a plurality of pilot signals wherein each pilot signal is composed of a plurality of pilot symbols, and wherein said pilot signals are generated as a concatenation of Walsh sequences and the complements of Walsh sequences;
• and
• altering at least one of said pilot signals to reduce symbol accumulation in said plurality of pilot signals.

In a base station in which a plurality of pilot signals are simultaneously transmitted, a method for transmitting said pilot signals comprising the steps of:

• generating a plurality of pilot signals wherein each of the pilot signals is composed of a plurality of pilot symbols;
• and
• altering the phase of at least one of said pilot signals in accordance with a quasi orthogonal function to reduce symbol accumulation in said plurality of pilot signals.